tjh.dev
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Documentation/admin-guide/kernel-parameters.txt
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Documentation/admin-guide/kernel-parameters.txt
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profile= [KNL] Enable kernel profiling via /proc/profile
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Format: [<profiletype>,]<number>
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Param: <profiletype>: "schedule", "sleep", or "kvm"
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Param: <profiletype>: "schedule" or "kvm"
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[defaults to kernel profiling]
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Param: "schedule" - profile schedule points.
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Param: "sleep" - profile D-state sleeping (millisecs).
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Requires CONFIG_SCHEDSTATS
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Param: "kvm" - profile VM exits.
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Param: <number> - step/bucket size as a power of 2 for
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statistical time based profiling.
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include/linux/profile.h
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include/linux/profile.h
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-10
kernel/profile.c
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kernel/profile.c
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int profile_setup(char *str)
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{
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static const char schedstr[] = "schedule";
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static const char sleepstr[] = "sleep";
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static const char kvmstr[] = "kvm";
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const char *select = NULL;
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int par;
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if (!strncmp(str, sleepstr, strlen(sleepstr))) {
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#ifdef CONFIG_SCHEDSTATS
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force_schedstat_enabled();
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prof_on = SLEEP_PROFILING;
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select = sleepstr;
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#else
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pr_warn("kernel sleep profiling requires CONFIG_SCHEDSTATS\n");
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#endif /* CONFIG_SCHEDSTATS */
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} else if (!strncmp(str, schedstr, strlen(schedstr))) {
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if (!strncmp(str, schedstr, strlen(schedstr))) {
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prof_on = SCHED_PROFILING;
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select = schedstr;
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} else if (!strncmp(str, kvmstr, strlen(kvmstr))) {
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kernel/sched/stats.c
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kernel/sched/stats.c
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trace_sched_stat_blocked(p, delta);
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/*
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* Blocking time is in units of nanosecs, so shift by
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* 20 to get a milliseconds-range estimation of the
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* amount of time that the task spent sleeping:
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*/
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if (unlikely(prof_on == SLEEP_PROFILING)) {
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profile_hits(SLEEP_PROFILING,
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(void *)get_wchan(p),
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delta >> 20);
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}
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account_scheduler_latency(p, delta >> 10, 0);
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}
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}