tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
tsacct: add 64-bit btime field
As there is only a 32-bit ac_btime field in taskstat and
we should handle dates after the overflow, add a new field
with the same information but 64-bit width that can hold
a full time64_t.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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include/uapi/linux/taskstats.h
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include/uapi/linux/taskstats.h
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*/
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#define TASKSTATS_VERSION 9
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#define TASKSTATS_VERSION 10
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#define TS_COMM_LEN 32 /* should be >= TASK_COMM_LEN
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* in linux/sched.h */
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/* Delay waiting for thrashing page */
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__u64 thrashing_count;
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__u64 thrashing_delay_total;
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/* v10: 64-bit btime to avoid overflow */
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__u64 ac_btime64; /* 64-bit begin time */
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};
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kernel/tsacct.c
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kernel/tsacct.c
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/* Convert to seconds for btime (note y2106 limit) */
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btime = ktime_get_real_seconds() - div_u64(delta, USEC_PER_SEC);
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stats->ac_btime = clamp_t(time64_t, btime, 0, U32_MAX);
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stats->ac_btime64 = btime;
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if (thread_group_leader(tsk)) {
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stats->ac_exitcode = tsk->exit_code;