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documentation: RCU grace-period memory ordering guarantees
This commit provides text and diagrams showing how Tree RCU implements
its grace-period memory ordering guarantees.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
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Documentation/RCU/Design/Memory-Ordering/Tree-RCU-Diagram.html
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<head><title>A Diagram of TREE_RCU's Grace-Period Memory Ordering</title>
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<html>
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<head><title>A Tour Through TREE_RCU's Grace-Period Memory Ordering</title>
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<meta HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
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<p>August 8, 2017</p>
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<p>This article was contributed by Paul E. McKenney</p>
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<h3>Introduction</h3>
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<p>This document gives a rough visual overview of how Tree RCU's
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grace-period memory ordering guarantee is provided.
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<ol>
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<li> <a href="#What Is Tree RCU's Grace Period Memory Ordering Guarantee?">
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What Is Tree RCU's Grace Period Memory Ordering Guarantee?</a>
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<li> <a href="#Tree RCU Grace Period Memory Ordering Building Blocks">
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Tree RCU Grace Period Memory Ordering Building Blocks</a>
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<li> <a href="#Tree RCU Grace Period Memory Ordering Components">
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Tree RCU Grace Period Memory Ordering Components</a>
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<li> <a href="#Putting It All Together">Putting It All Together</a>
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</ol>
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<h3><a name="What Is Tree RCU's Grace Period Memory Ordering Guarantee?">
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What Is Tree RCU's Grace Period Memory Ordering Guarantee?</a></h3>
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<p>RCU grace periods provide extremely strong memory-ordering guarantees
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for non-idle non-offline code.
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Any code that happens after the end of a given RCU grace period is guaranteed
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to see the effects of all accesses prior to the beginning of that grace
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period that are within RCU read-side critical sections.
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Similarly, any code that happens before the beginning of a given RCU grace
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period is guaranteed to see the effects of all accesses following the end
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of that grace period that are within RCU read-side critical sections.
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<p>This guarantee is particularly pervasive for <tt>synchronize_sched()</tt>,
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for which RCU-sched read-side critical sections include any region
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of code for which preemption is disabled.
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Given that each individual machine instruction can be thought of as
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an extremely small region of preemption-disabled code, one can think of
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<tt>synchronize_sched()</tt> as <tt>smp_mb()</tt> on steroids.
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<p>RCU updaters use this guarantee by splitting their updates into
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two phases, one of which is executed before the grace period and
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the other of which is executed after the grace period.
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In the most common use case, phase one removes an element from
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a linked RCU-protected data structure, and phase two frees that element.
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For this to work, any readers that have witnessed state prior to the
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phase-one update (in the common case, removal) must not witness state
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following the phase-two update (in the common case, freeing).
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<p>The RCU implementation provides this guarantee using a network
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of lock-based critical sections, memory barriers, and per-CPU
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processing, as is described in the following sections.
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<h3><a name="Tree RCU Grace Period Memory Ordering Building Blocks">
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Tree RCU Grace Period Memory Ordering Building Blocks</a></h3>
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<p>The workhorse for RCU's grace-period memory ordering is the
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critical section for the <tt>rcu_node</tt> structure's
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<tt>->lock</tt>.
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These critical sections use helper functions for lock acquisition, including
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<tt>raw_spin_lock_rcu_node()</tt>,
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<tt>raw_spin_lock_irq_rcu_node()</tt>, and
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<tt>raw_spin_lock_irqsave_rcu_node()</tt>.
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Their lock-release counterparts are
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<tt>raw_spin_unlock_rcu_node()</tt>,
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<tt>raw_spin_unlock_irq_rcu_node()</tt>, and
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<tt>raw_spin_unlock_irqrestore_rcu_node()</tt>,
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respectively.
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For completeness, a
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<tt>raw_spin_trylock_rcu_node()</tt>
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is also provided.
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The key point is that the lock-acquisition functions, including
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<tt>raw_spin_trylock_rcu_node()</tt>, all invoke
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<tt>smp_mb__after_unlock_lock()</tt> immediately after successful
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acquisition of the lock.
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<p>Therefore, for any given <tt>rcu_node</tt> struction, any access
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happening before one of the above lock-release functions will be seen
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by all CPUs as happening before any access happening after a later
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one of the above lock-acquisition functions.
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Furthermore, any access happening before one of the
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above lock-release function on any given CPU will be seen by all
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CPUs as happening before any access happening after a later one
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of the above lock-acquisition functions executing on that same CPU,
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even if the lock-release and lock-acquisition functions are operating
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on different <tt>rcu_node</tt> structures.
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Tree RCU uses these two ordering guarantees to form an ordering
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network among all CPUs that were in any way involved in the grace
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period, including any CPUs that came online or went offline during
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the grace period in question.
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<p>The following litmus test exhibits the ordering effects of these
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lock-acquisition and lock-release functions:
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<pre>
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1 int x, y, z;
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2
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3 void task0(void)
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4 {
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5 raw_spin_lock_rcu_node(rnp);
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6 WRITE_ONCE(x, 1);
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7 r1 = READ_ONCE(y);
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8 raw_spin_unlock_rcu_node(rnp);
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9 }
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10
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11 void task1(void)
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12 {
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13 raw_spin_lock_rcu_node(rnp);
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14 WRITE_ONCE(y, 1);
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15 r2 = READ_ONCE(z);
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16 raw_spin_unlock_rcu_node(rnp);
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17 }
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18
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19 void task2(void)
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20 {
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21 WRITE_ONCE(z, 1);
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22 smp_mb();
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23 r3 = READ_ONCE(x);
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24 }
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25
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26 WARN_ON(r1 == 0 && r2 == 0 && r3 == 0);
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</pre>
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<p>The <tt>WARN_ON()</tt> is evaluated at “the end of time”,
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after all changes have propagated throughout the system.
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Without the <tt>smp_mb__after_unlock_lock()</tt> provided by the
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acquisition functions, this <tt>WARN_ON()</tt> could trigger, for example
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on PowerPC.
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The <tt>smp_mb__after_unlock_lock()</tt> invocations prevent this
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<tt>WARN_ON()</tt> from triggering.
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<p>This approach must be extended to include idle CPUs, which need
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RCU's grace-period memory ordering guarantee to extend to any
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RCU read-side critical sections preceding and following the current
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idle sojourn.
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This case is handled by calls to the strongly ordered
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<tt>atomic_add_return()</tt> read-modify-write atomic operation that
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is invoked within <tt>rcu_dynticks_eqs_enter()</tt> at idle-entry
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time and within <tt>rcu_dynticks_eqs_exit()</tt> at idle-exit time.
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The grace-period kthread invokes <tt>rcu_dynticks_snap()</tt> and
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<tt>rcu_dynticks_in_eqs_since()</tt> (both of which invoke
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an <tt>atomic_add_return()</tt> of zero) to detect idle CPUs.
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<table>
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<tr><th> </th></tr>
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<tr><th align="left">Quick Quiz:</th></tr>
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<tr><td>
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But what about CPUs that remain offline for the entire
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grace period?
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</td></tr>
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<tr><th align="left">Answer:</th></tr>
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<tr><td bgcolor="#ffffff"><font color="ffffff">
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Such CPUs will be offline at the beginning of the grace period,
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so the grace period won't expect quiescent states from them.
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Races between grace-period start and CPU-hotplug operations
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are mediated by the CPU's leaf <tt>rcu_node</tt> structure's
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<tt>->lock</tt> as described above.
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</font></td></tr>
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<tr><td> </td></tr>
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</table>
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<p>The approach must be extended to handle one final case, that
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of waking a task blocked in <tt>synchronize_rcu()</tt>.
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This task might be affinitied to a CPU that is not yet aware that
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the grace period has ended, and thus might not yet be subject to
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the grace period's memory ordering.
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Therefore, there is an <tt>smp_mb()</tt> after the return from
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<tt>wait_for_completion()</tt> in the <tt>synchronize_rcu()</tt>
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code path.
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<table>
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<tr><th> </th></tr>
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<tr><th align="left">Quick Quiz:</th></tr>
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<tr><td>
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What? Where???
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I don't see any <tt>smp_mb()</tt> after the return from
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<tt>wait_for_completion()</tt>!!!
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</td></tr>
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<tr><th align="left">Answer:</th></tr>
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<tr><td bgcolor="#ffffff"><font color="ffffff">
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That would be because I spotted the need for that
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<tt>smp_mb()</tt> during the creation of this documentation,
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and it is therefore unlikely to hit mainline before v4.14.
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Kudos to Lance Roy, Will Deacon, Peter Zijlstra, and
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Jonathan Cameron for asking questions that sensitized me
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to the rather elaborate sequence of events that demonstrate
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the need for this memory barrier.
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</font></td></tr>
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<tr><td> </td></tr>
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</table>
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<p>Tree RCU's grace--period memory-ordering guarantees rely most
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heavily on the <tt>rcu_node</tt> structure's <tt>->lock</tt>
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field, so much so that it is necessary to abbreviate this pattern
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in the diagrams in the next section.
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For example, consider the <tt>rcu_prepare_for_idle()</tt> function
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shown below, which is one of several functions that enforce ordering
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of newly arrived RCU callbacks against future grace periods:
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<pre>
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1 static void rcu_prepare_for_idle(void)
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2 {
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3 bool needwake;
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4 struct rcu_data *rdp;
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5 struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks);
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6 struct rcu_node *rnp;
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7 struct rcu_state *rsp;
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8 int tne;
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9
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10 if (IS_ENABLED(CONFIG_RCU_NOCB_CPU_ALL) ||
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11 rcu_is_nocb_cpu(smp_processor_id()))
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12 return;
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13 tne = READ_ONCE(tick_nohz_active);
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14 if (tne != rdtp->tick_nohz_enabled_snap) {
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15 if (rcu_cpu_has_callbacks(NULL))
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16 invoke_rcu_core();
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17 rdtp->tick_nohz_enabled_snap = tne;
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18 return;
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19 }
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20 if (!tne)
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21 return;
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22 if (rdtp->all_lazy &&
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23 rdtp->nonlazy_posted != rdtp->nonlazy_posted_snap) {
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24 rdtp->all_lazy = false;
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25 rdtp->nonlazy_posted_snap = rdtp->nonlazy_posted;
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26 invoke_rcu_core();
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27 return;
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28 }
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29 if (rdtp->last_accelerate == jiffies)
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30 return;
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31 rdtp->last_accelerate = jiffies;
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32 for_each_rcu_flavor(rsp) {
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33 rdp = this_cpu_ptr(rsp->rda);
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34 if (rcu_segcblist_pend_cbs(&rdp->cblist))
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35 continue;
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36 rnp = rdp->mynode;
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37 raw_spin_lock_rcu_node(rnp);
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38 needwake = rcu_accelerate_cbs(rsp, rnp, rdp);
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39 raw_spin_unlock_rcu_node(rnp);
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40 if (needwake)
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41 rcu_gp_kthread_wake(rsp);
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42 }
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43 }
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</pre>
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<p>But the only part of <tt>rcu_prepare_for_idle()</tt> that really
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matters for this discussion are lines 37–39.
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We will therefore abbreviate this function as follows:
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</p><p><img src="rcu_node-lock.svg" alt="rcu_node-lock.svg">
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<p>The box represents the <tt>rcu_node</tt> structure's <tt>->lock</tt>
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critical section, with the double line on top representing the additional
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<tt>smp_mb__after_unlock_lock()</tt>.
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<h3><a name="Tree RCU Grace Period Memory Ordering Components">
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Tree RCU Grace Period Memory Ordering Components</a></h3>
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<p>Tree RCU's grace-period memory-ordering guarantee is provided by
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a number of RCU components:
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<ol>
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<li> <a href="#Callback Registry">Callback Registry</a>
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<li> <a href="#Grace-Period Initialization">Grace-Period Initialization</a>
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<li> <a href="#Self-Reported Quiescent States">
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Self-Reported Quiescent States</a>
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<li> <a href="#Dynamic Tick Interface">Dynamic Tick Interface</a>
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<li> <a href="#CPU-Hotplug Interface">CPU-Hotplug Interface</a>
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<li> <a href="Forcing Quiescent States">Forcing Quiescent States</a>
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<li> <a href="Grace-Period Cleanup">Grace-Period Cleanup</a>
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<li> <a href="Callback Invocation">Callback Invocation</a>
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</ol>
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<p>Each of the following section looks at the corresponding component
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in detail.
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<h4><a name="Callback Registry">Callback Registry</a></h4>
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<p>If RCU's grace-period guarantee is to mean anything at all, any
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access that happens before a given invocation of <tt>call_rcu()</tt>
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must also happen before the corresponding grace period.
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The implementation of this portion of RCU's grace period guarantee
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is shown in the following figure:
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</p><p><img src="TreeRCU-callback-registry.svg" alt="TreeRCU-callback-registry.svg">
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<p>Because <tt>call_rcu()</tt> normally acts only on CPU-local state,
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it provides no ordering guarantees, either for itself or for
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phase one of the update (which again will usually be removal of
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an element from an RCU-protected data structure).
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It simply enqueues the <tt>rcu_head</tt> structure on a per-CPU list,
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which cannot become associated with a grace period until a later
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call to <tt>rcu_accelerate_cbs()</tt>, as shown in the diagram above.
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<p>One set of code paths shown on the left invokes
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<tt>rcu_accelerate_cbs()</tt> via
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<tt>note_gp_changes()</tt>, either directly from <tt>call_rcu()</tt> (if
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the current CPU is inundated with queued <tt>rcu_head</tt> structures)
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or more likely from an <tt>RCU_SOFTIRQ</tt> handler.
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Another code path in the middle is taken only in kernels built with
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<tt>CONFIG_RCU_FAST_NO_HZ=y</tt>, which invokes
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<tt>rcu_accelerate_cbs()</tt> via <tt>rcu_prepare_for_idle()</tt>.
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The final code path on the right is taken only in kernels built with
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<tt>CONFIG_HOTPLUG_CPU=y</tt>, which invokes
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<tt>rcu_accelerate_cbs()</tt> via
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<tt>rcu_advance_cbs()</tt>, <tt>rcu_migrate_callbacks</tt>,
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<tt>rcutree_migrate_callbacks()</tt>, and <tt>takedown_cpu()</tt>,
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which in turn is invoked on a surviving CPU after the outgoing
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CPU has been completely offlined.
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<p>There are a few other code paths within grace-period processing
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that opportunistically invoke <tt>rcu_accelerate_cbs()</tt>.
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However, either way, all of the CPU's recently queued <tt>rcu_head</tt>
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structures are associated with a future grace-period number under
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the protection of the CPU's lead <tt>rcu_node</tt> structure's
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<tt>->lock</tt>.
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In all cases, there is full ordering against any prior critical section
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for that same <tt>rcu_node</tt> structure's <tt>->lock</tt>, and
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also full ordering against any of the current task's or CPU's prior critical
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sections for any <tt>rcu_node</tt> structure's <tt>->lock</tt>.
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<p>The next section will show how this ordering ensures that any
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accesses prior to the <tt>call_rcu()</tt> (particularly including phase
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one of the update)
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happen before the start of the corresponding grace period.
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<table>
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<tr><th> </th></tr>
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<tr><th align="left">Quick Quiz:</th></tr>
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<tr><td>
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But what about <tt>synchronize_rcu()</tt>?
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</td></tr>
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<tr><th align="left">Answer:</th></tr>
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<tr><td bgcolor="#ffffff"><font color="ffffff">
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The <tt>synchronize_rcu()</tt> passes <tt>call_rcu()</tt>
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to <tt>wait_rcu_gp()</tt>, which invokes it.
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So either way, it eventually comes down to <tt>call_rcu()</tt>.
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</font></td></tr>
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<tr><td> </td></tr>
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</table>
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<h4><a name="Grace-Period Initialization">Grace-Period Initialization</a></h4>
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<p>Grace-period initialization is carried out by
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the grace-period kernel thread, which makes several passes over the
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<tt>rcu_node</tt> tree within the <tt>rcu_gp_init()</tt> function.
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This means that showing the full flow of ordering through the
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grace-period computation will require duplicating this tree.
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If you find this confusing, please note that the state of the
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<tt>rcu_node</tt> changes over time, just like Heraclitus's river.
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However, to keep the <tt>rcu_node</tt> river tractable, the
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grace-period kernel thread's traversals are presented in multiple
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parts, starting in this section with the various phases of
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grace-period initialization.
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<p>The first ordering-related grace-period initialization action is to
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increment the <tt>rcu_state</tt> structure's <tt>->gpnum</tt>
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grace-period-number counter, as shown below:
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</p><p><img src="TreeRCU-gp-init-1.svg" alt="TreeRCU-gp-init-1.svg" width="75%">
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<p>The actual increment is carried out using <tt>smp_store_release()</tt>,
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which helps reject false-positive RCU CPU stall detection.
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Note that only the root <tt>rcu_node</tt> structure is touched.
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<p>The first pass through the <tt>rcu_node</tt> tree updates bitmasks
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based on CPUs having come online or gone offline since the start of
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the previous grace period.
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In the common case where the number of online CPUs for this <tt>rcu_node</tt>
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structure has not transitioned to or from zero,
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this pass will scan only the leaf <tt>rcu_node</tt> structures.
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However, if the number of online CPUs for a given leaf <tt>rcu_node</tt>
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structure has transitioned from zero,
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<tt>rcu_init_new_rnp()</tt> will be invoked for the first incoming CPU.
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Similarly, if the number of online CPUs for a given leaf <tt>rcu_node</tt>
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structure has transitioned to zero,
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<tt>rcu_cleanup_dead_rnp()</tt> will be invoked for the last outgoing CPU.
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The diagram below shows the path of ordering if the leftmost
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<tt>rcu_node</tt> structure onlines its first CPU and if the next
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<tt>rcu_node</tt> structure has no online CPUs
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(or, alternatively if the leftmost <tt>rcu_node</tt> structure offlines
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its last CPU and if the next <tt>rcu_node</tt> structure has no online CPUs).
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387
+
</p><p><img src="TreeRCU-gp-init-2.svg" alt="TreeRCU-gp-init-1.svg" width="75%">
388
+
389
+
<p>The final <tt>rcu_gp_init()</tt> pass through the <tt>rcu_node</tt>
390
+
tree traverses breadth-first, setting each <tt>rcu_node</tt> structure's
391
+
<tt>->gpnum</tt> field to the newly incremented value from the
392
+
<tt>rcu_state</tt> structure, as shown in the following diagram.
393
+
394
+
</p><p><img src="TreeRCU-gp-init-3.svg" alt="TreeRCU-gp-init-1.svg" width="75%">
395
+
396
+
<p>This change will also cause each CPU's next call to
397
+
<tt>__note_gp_changes()</tt>
398
+
to notice that a new grace period has started, as described in the next
399
+
section.
400
+
But because the grace-period kthread started the grace period at the
401
+
root (with the increment of the <tt>rcu_state</tt> structure's
402
+
<tt>->gpnum</tt> field) before setting each leaf <tt>rcu_node</tt>
403
+
structure's <tt>->gpnum</tt> field, each CPU's observation of
404
+
the start of the grace period will happen after the actual start
405
+
of the grace period.
406
+
407
+
<table>
408
+
<tr><th> </th></tr>
409
+
<tr><th align="left">Quick Quiz:</th></tr>
410
+
<tr><td>
411
+
But what about the CPU that started the grace period?
412
+
Why wouldn't it see the start of the grace period right when
413
+
it started that grace period?
414
+
</td></tr>
415
+
<tr><th align="left">Answer:</th></tr>
416
+
<tr><td bgcolor="#ffffff"><font color="ffffff">
417
+
In some deep philosophical and overly anthromorphized
418
+
sense, yes, the CPU starting the grace period is immediately
419
+
aware of having done so.
420
+
However, if we instead assume that RCU is not self-aware,
421
+
then even the CPU starting the grace period does not really
422
+
become aware of the start of this grace period until its
423
+
first call to <tt>__note_gp_changes()</tt>.
424
+
On the other hand, this CPU potentially gets early notification
425
+
because it invokes <tt>__note_gp_changes()</tt> during its
426
+
last <tt>rcu_gp_init()</tt> pass through its leaf
427
+
<tt>rcu_node</tt> structure.
428
+
</font></td></tr>
429
+
<tr><td> </td></tr>
430
+
</table>
431
+
432
+
<h4><a name="Self-Reported Quiescent States">
433
+
Self-Reported Quiescent States</a></h4>
434
+
435
+
<p>When all entities that might block the grace period have reported
436
+
quiescent states (or as described in a later section, had quiescent
437
+
states reported on their behalf), the grace period can end.
438
+
Online non-idle CPUs report their own quiescent states, as shown
439
+
in the following diagram:
440
+
441
+
</p><p><img src="TreeRCU-qs.svg" alt="TreeRCU-qs.svg" width="75%">
442
+
443
+
<p>This is for the last CPU to report a quiescent state, which signals
444
+
the end of the grace period.
445
+
Earlier quiescent states would push up the <tt>rcu_node</tt> tree
446
+
only until they encountered an <tt>rcu_node</tt> structure that
447
+
is waiting for additional quiescent states.
448
+
However, ordering is nevertheless preserved because some later quiescent
449
+
state will acquire that <tt>rcu_node</tt> structure's <tt>->lock</tt>.
450
+
451
+
<p>Any number of events can lead up to a CPU invoking
452
+
<tt>note_gp_changes</tt> (or alternatively, directly invoking
453
+
<tt>__note_gp_changes()</tt>), at which point that CPU will notice
454
+
the start of a new grace period while holding its leaf
455
+
<tt>rcu_node</tt> lock.
456
+
Therefore, all execution shown in this diagram happens after the
457
+
start of the grace period.
458
+
In addition, this CPU will consider any RCU read-side critical
459
+
section that started before the invocation of <tt>__note_gp_changes()</tt>
460
+
to have started before the grace period, and thus a critical
461
+
section that the grace period must wait on.
462
+
463
+
<table>
464
+
<tr><th> </th></tr>
465
+
<tr><th align="left">Quick Quiz:</th></tr>
466
+
<tr><td>
467
+
But a RCU read-side critical section might have started
468
+
after the beginning of the grace period
469
+
(the <tt>->gpnum++</tt> from earlier), so why should
470
+
the grace period wait on such a critical section?
471
+
</td></tr>
472
+
<tr><th align="left">Answer:</th></tr>
473
+
<tr><td bgcolor="#ffffff"><font color="ffffff">
474
+
It is indeed not necessary for the grace period to wait on such
475
+
a critical section.
476
+
However, it is permissible to wait on it.
477
+
And it is furthermore important to wait on it, as this
478
+
lazy approach is far more scalable than a “big bang”
479
+
all-at-once grace-period start could possibly be.
480
+
</font></td></tr>
481
+
<tr><td> </td></tr>
482
+
</table>
483
+
484
+
<p>If the CPU does a context switch, a quiescent state will be
485
+
noted by <tt>rcu_node_context_switch()</tt> on the left.
486
+
On the other hand, if the CPU takes a scheduler-clock interrupt
487
+
while executing in usermode, a quiescent state will be noted by
488
+
<tt>rcu_check_callbacks()</tt> on the right.
489
+
Either way, the passage through a quiescent state will be noted
490
+
in a per-CPU variable.
491
+
492
+
<p>The next time an <tt>RCU_SOFTIRQ</tt> handler executes on
493
+
this CPU (for example, after the next scheduler-clock
494
+
interrupt), <tt>__rcu_process_callbacks()</tt> will invoke
495
+
<tt>rcu_check_quiescent_state()</tt>, which will notice the
496
+
recorded quiescent state, and invoke
497
+
<tt>rcu_report_qs_rdp()</tt>.
498
+
If <tt>rcu_report_qs_rdp()</tt> verifies that the quiescent state
499
+
really does apply to the current grace period, it invokes
500
+
<tt>rcu_report_rnp()</tt> which traverses up the <tt>rcu_node</tt>
501
+
tree as shown at the bottom of the diagram, clearing bits from
502
+
each <tt>rcu_node</tt> structure's <tt>->qsmask</tt> field,
503
+
and propagating up the tree when the result is zero.
504
+
505
+
<p>Note that traversal passes upwards out of a given <tt>rcu_node</tt>
506
+
structure only if the current CPU is reporting the last quiescent
507
+
state for the subtree headed by that <tt>rcu_node</tt> structure.
508
+
A key point is that if a CPU's traversal stops at a given <tt>rcu_node</tt>
509
+
structure, then there will be a later traversal by another CPU
510
+
(or perhaps the same one) that proceeds upwards
511
+
from that point, and the <tt>rcu_node</tt> <tt>->lock</tt>
512
+
guarantees that the first CPU's quiescent state happens before the
513
+
remainder of the second CPU's traversal.
514
+
Applying this line of thought repeatedly shows that all CPUs'
515
+
quiescent states happen before the last CPU traverses through
516
+
the root <tt>rcu_node</tt> structure, the “last CPU”
517
+
being the one that clears the last bit in the root <tt>rcu_node</tt>
518
+
structure's <tt>->qsmask</tt> field.
519
+
520
+
<h4><a name="Dynamic Tick Interface">Dynamic Tick Interface</a></h4>
521
+
522
+
<p>Due to energy-efficiency considerations, RCU is forbidden from
523
+
disturbing idle CPUs.
524
+
CPUs are therefore required to notify RCU when entering or leaving idle
525
+
state, which they do via fully ordered value-returning atomic operations
526
+
on a per-CPU variable.
527
+
The ordering effects are as shown below:
528
+
529
+
</p><p><img src="TreeRCU-dyntick.svg" alt="TreeRCU-dyntick.svg" width="50%">
530
+
531
+
<p>The RCU grace-period kernel thread samples the per-CPU idleness
532
+
variable while holding the corresponding CPU's leaf <tt>rcu_node</tt>
533
+
structure's <tt>->lock</tt>.
534
+
This means that any RCU read-side critical sections that precede the
535
+
idle period (the oval near the top of the diagram above) will happen
536
+
before the end of the current grace period.
537
+
Similarly, the beginning of the current grace period will happen before
538
+
any RCU read-side critical sections that follow the
539
+
idle period (the oval near the bottom of the diagram above).
540
+
541
+
<p>Plumbing this into the full grace-period execution is described
542
+
<a href="#Forcing Quiescent States">below</a>.
543
+
544
+
<h4><a name="CPU-Hotplug Interface">CPU-Hotplug Interface</a></h4>
545
+
546
+
<p>RCU is also forbidden from disturbing offline CPUs, which might well
547
+
be powered off and removed from the system completely.
548
+
CPUs are therefore required to notify RCU of their comings and goings
549
+
as part of the corresponding CPU hotplug operations.
550
+
The ordering effects are shown below:
551
+
552
+
</p><p><img src="TreeRCU-hotplug.svg" alt="TreeRCU-hotplug.svg" width="50%">
553
+
554
+
<p>Because CPU hotplug operations are much less frequent than idle transitions,
555
+
they are heavier weight, and thus acquire the CPU's leaf <tt>rcu_node</tt>
556
+
structure's <tt>->lock</tt> and update this structure's
557
+
<tt>->qsmaskinitnext</tt>.
558
+
The RCU grace-period kernel thread samples this mask to detect CPUs
559
+
having gone offline since the beginning of this grace period.
560
+
561
+
<p>Plumbing this into the full grace-period execution is described
562
+
<a href="#Forcing Quiescent States">below</a>.
563
+
564
+
<h4><a name="Forcing Quiescent States">Forcing Quiescent States</a></h4>
565
+
566
+
<p>As noted above, idle and offline CPUs cannot report their own
567
+
quiescent states, and therefore the grace-period kernel thread
568
+
must do the reporting on their behalf.
569
+
This process is called “forcing quiescent states”, it is
570
+
repeated every few jiffies, and its ordering effects are shown below:
571
+
572
+
</p><p><img src="TreeRCU-gp-fqs.svg" alt="TreeRCU-gp-fqs.svg" width="100%">
573
+
574
+
<p>Each pass of quiescent state forcing is guaranteed to traverse the
575
+
leaf <tt>rcu_node</tt> structures, and if there are no new quiescent
576
+
states due to recently idled and/or offlined CPUs, then only the
577
+
leaves are traversed.
578
+
However, if there is a newly offlined CPU as illustrated on the left
579
+
or a newly idled CPU as illustrated on the right, the corresponding
580
+
quiescent state will be driven up towards the root.
581
+
As with self-reported quiescent states, the upwards driving stops
582
+
once it reaches an <tt>rcu_node</tt> structure that has quiescent
583
+
states outstanding from other CPUs.
584
+
585
+
<table>
586
+
<tr><th> </th></tr>
587
+
<tr><th align="left">Quick Quiz:</th></tr>
588
+
<tr><td>
589
+
The leftmost drive to root stopped before it reached
590
+
the root <tt>rcu_node</tt> structure, which means that
591
+
there are still CPUs subordinate to that structure on
592
+
which the current grace period is waiting.
593
+
Given that, how is it possible that the rightmost drive
594
+
to root ended the grace period?
595
+
</td></tr>
596
+
<tr><th align="left">Answer:</th></tr>
597
+
<tr><td bgcolor="#ffffff"><font color="ffffff">
598
+
Good analysis!
599
+
It is in fact impossible in the absence of bugs in RCU.
600
+
But this diagram is complex enough as it is, so simplicity
601
+
overrode accuracy.
602
+
You can think of it as poetic license, or you can think of
603
+
it as misdirection that is resolved in the
604
+
<a href="#Putting It All Together">stitched-together diagram</a>.
605
+
</font></td></tr>
606
+
<tr><td> </td></tr>
607
+
</table>
608
+
609
+
<h4><a name="Grace-Period Cleanup">Grace-Period Cleanup</a></h4>
610
+
611
+
<p>Grace-period cleanup first scans the <tt>rcu_node</tt> tree
612
+
breadth-first setting all the <tt>->completed</tt> fields equal
613
+
to the number of the newly completed grace period, then it sets
614
+
the <tt>rcu_state</tt> structure's <tt>->completed</tt> field,
615
+
again to the number of the newly completed grace period.
616
+
The ordering effects are shown below:
617
+
618
+
</p><p><img src="TreeRCU-gp-cleanup.svg" alt="TreeRCU-gp-cleanup.svg" width="75%">
619
+
620
+
<p>As indicated by the oval at the bottom of the diagram, once
621
+
grace-period cleanup is complete, the next grace period can begin.
622
+
623
+
<table>
624
+
<tr><th> </th></tr>
625
+
<tr><th align="left">Quick Quiz:</th></tr>
626
+
<tr><td>
627
+
But when precisely does the grace period end?
628
+
</td></tr>
629
+
<tr><th align="left">Answer:</th></tr>
630
+
<tr><td bgcolor="#ffffff"><font color="ffffff">
631
+
There is no useful single point at which the grace period
632
+
can be said to end.
633
+
The earliest reasonable candidate is as soon as the last
634
+
CPU has reported its quiescent state, but it may be some
635
+
milliseconds before RCU becomes aware of this.
636
+
The latest reasonable candidate is once the <tt>rcu_state</tt>
637
+
structure's <tt>->completed</tt> field has been updated,
638
+
but it is quite possible that some CPUs have already completed
639
+
phase two of their updates by that time.
640
+
In short, if you are going to work with RCU, you need to
641
+
learn to embrace uncertainty.
642
+
</font></td></tr>
643
+
<tr><td> </td></tr>
644
+
</table>
645
+
646
+
647
+
<h4><a name="Callback Invocation">Callback Invocation</a></h4>
648
+
649
+
<p>Once a given CPU's leaf <tt>rcu_node</tt> structure's
650
+
<tt>->completed</tt> field has been updated, that CPU can begin
651
+
invoking its RCU callbacks that were waiting for this grace period
652
+
to end.
653
+
These callbacks are identified by <tt>rcu_advance_cbs()</tt>,
654
+
which is usually invoked by <tt>__note_gp_changes()</tt>.
655
+
As shown in the diagram below, this invocation can be triggered by
656
+
the scheduling-clock interrupt (<tt>rcu_check_callbacks()</tt> on
657
+
the left) or by idle entry (<tt>rcu_cleanup_after_idle()</tt> on
658
+
the right, but only for kernels build with
659
+
<tt>CONFIG_RCU_FAST_NO_HZ=y</tt>).
660
+
Either way, <tt>RCU_SOFTIRQ</tt> is raised, which results in
661
+
<tt>rcu_do_batch()</tt> invoking the callbacks, which in turn
662
+
allows those callbacks to carry out (either directly or indirectly
663
+
via wakeup) the needed phase-two processing for each update.
664
+
665
+
</p><p><img src="TreeRCU-callback-invocation.svg" alt="TreeRCU-callback-invocation.svg" width="60%">
666
+
667
+
<p>Please note that callback invocation can also be prompted by any
668
+
number of corner-case code paths, for example, when a CPU notes that
669
+
it has excessive numbers of callbacks queued.
670
+
In all cases, the CPU acquires its leaf <tt>rcu_node</tt> structure's
671
+
<tt>->lock</tt> before invoking callbacks, which preserves the
672
+
required ordering against the newly completed grace period.
673
+
674
+
<p>However, if the callback function communicates to other CPUs,
675
+
for example, doing a wakeup, then it is that function's responsibility
676
+
to maintain ordering.
677
+
For example, if the callback function wakes up a task that runs on
678
+
some other CPU, proper ordering must in place in both the callback
679
+
function and the task being awakened.
680
+
To see why this is important, consider the top half of the
681
+
<a href="#Grace-Period Cleanup">grace-period cleanup</a> diagram.
682
+
The callback might be running on a CPU corresponding to the leftmost
683
+
leaf <tt>rcu_node</tt> structure, and awaken a task that is to run on
684
+
a CPU corresponding to the rightmost leaf <tt>rcu_node</tt> structure,
685
+
and the grace-period kernel thread might not yet have reached the
686
+
rightmost leaf.
687
+
In this case, the grace period's memory ordering might not yet have
688
+
reached that CPU, so again the callback function and the awakened
689
+
task must supply proper ordering.
690
+
691
+
<h3><a name="Putting It All Together">Putting It All Together</a></h3>
692
+
693
+
<p>A stitched-together diagram is
694
+
<a href="Tree-RCU-Diagram.html">here</a>.
695
+
696
+
<h3><a name="Legal Statement">
697
+
Legal Statement</a></h3>
698
+
699
+
<p>This work represents the view of the author and does not necessarily
700
+
represent the view of IBM.
701
+
702
+
</p><p>Linux is a registered trademark of Linus Torvalds.
703
+
704
+
</p><p>Other company, product, and service names may be trademarks or
705
+
service marks of others.
706
+
707
+
</body></html>
+486
Documentation/RCU/Design/Memory-Ordering/TreeRCU-callback-invocation.svg
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