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Date: Mon, 18 Dec 2006 23:50:08 +0000 From: David Wragg <david@...gg.org> To: linux-kernel@...r.kernel.org Subject: [PATCH] procfs: export context switch counts in /proc/*/stat The kernel already maintains context switch counts for each task, and exposes them through getrusage(2). These counters can also be used more generally to track which processes on the system are active (i.e. getting scheduled to run), but getrusage is too constrained to use it in that way. This patch (against 2.6.19/2.6.19.1) adds the four context switch values (voluntary context switches, involuntary context switches, and the same values accumulated from terminated child processes) to the end of /proc/*/stat, similarly to min_flt, maj_flt and the time used values. Signed-off-by: David Wragg <david@...gg.org> diff -uprN --exclude='*.o' --exclude='*~' --exclude='.*' linux-2.6.19.1/fs/proc/array.c linux-2.6.19.1.build/fs/proc/array.c --- linux-2.6.19.1/fs/proc/array.c 2006-12-18 14:35:36.000000000 +0000 +++ linux-2.6.19.1.build/fs/proc/array.c 2006-12-18 14:43:21.000000000 +0000 @@ -327,6 +327,8 @@ static int do_task_stat(struct task_stru unsigned long cmin_flt = 0, cmaj_flt = 0; unsigned long min_flt = 0, maj_flt = 0; cputime_t cutime, cstime, utime, stime; + unsigned long cnvcsw = 0, cnivcsw = 0; + unsigned long nvcsw = 0, nivcsw = 0; unsigned long rsslim = 0; char tcomm[sizeof(task->comm)]; unsigned long flags; @@ -369,6 +371,8 @@ static int do_task_stat(struct task_stru cmaj_flt = sig->cmaj_flt; cutime = sig->cutime; cstime = sig->cstime; + cnvcsw = sig->cnvcsw; + cnivcsw = sig->cnivcsw; rsslim = sig->rlim[RLIMIT_RSS].rlim_cur; /* add up live thread stats at the group level */ @@ -379,6 +383,8 @@ static int do_task_stat(struct task_stru maj_flt += t->maj_flt; utime = cputime_add(utime, t->utime); stime = cputime_add(stime, t->stime); + nvcsw += t->nvcsw; + nivcsw += t->nivcsw; t = next_thread(t); } while (t != task); @@ -386,6 +392,8 @@ static int do_task_stat(struct task_stru maj_flt += sig->maj_flt; utime = cputime_add(utime, sig->utime); stime = cputime_add(stime, sig->stime); + nvcsw += sig->nvcsw; + nivcsw += sig->nivcsw; } sid = sig->session; @@ -404,6 +412,8 @@ static int do_task_stat(struct task_stru maj_flt = task->maj_flt; utime = task->utime; stime = task->stime; + nvcsw = task->nvcsw; + nivcsw = task->nivcsw; } /* scale priority and nice values from timeslices to -20..20 */ @@ -420,7 +430,7 @@ static int do_task_stat(struct task_stru res = sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \ %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \ -%lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %lu %llu\n", +%lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %lu %llu %lu %lu %lu %lu\n", task->pid, tcomm, state, @@ -465,7 +475,12 @@ static int do_task_stat(struct task_stru task_cpu(task), task->rt_priority, task->policy, - (unsigned long long)delayacct_blkio_ticks(task)); + (unsigned long long)delayacct_blkio_ticks(task), + nvcsw, + cnvcsw, + nivcsw, + cnivcsw); + if(mm) mmput(mm); return res; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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