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| author | Maxim Uvarov <muvarov@ru.mvista.com> | 2007-07-15 23:40:48 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-16 09:05:46 -0700 |
| commit | b663a79c191508f27cd885224b592a878c0ba0f6 (patch) | |
| tree | 270a0472bf1fb0c7323ecb60ec68e40d02dcb1b4 /kernel | |
| parent | a6c15c2b0fbfd5c0a84f5f0e1e3f20f85d2b8692 (diff) | |
| download | kernel_samsung_smdk4412-b663a79c191508f27cd885224b592a878c0ba0f6.zip kernel_samsung_smdk4412-b663a79c191508f27cd885224b592a878c0ba0f6.tar.gz kernel_samsung_smdk4412-b663a79c191508f27cd885224b592a878c0ba0f6.tar.bz2 | |
taskstats: add context-switch counters
Make available to the user the following task and process performance
statistics:
* Involuntary Context Switches (task_struct->nivcsw)
* Voluntary Context Switches (task_struct->nvcsw)
Statistics information is available from:
1. taskstats interface (Documentation/accounting/)
2. /proc/PID/status (task only).
This data is useful for detecting hyperactivity patterns between processes.
[akpm@linux-foundation.org: cleanup]
Signed-off-by: Maxim Uvarov <muvarov@ru.mvista.com>
Cc: Shailabh Nagar <nagar@watson.ibm.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Jay Lan <jlan@engr.sgi.com>
Cc: Jonathan Lim <jlim@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/taskstats.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/taskstats.c b/kernel/taskstats.c index 906cae7..059431e 100644 --- a/kernel/taskstats.c +++ b/kernel/taskstats.c @@ -196,6 +196,8 @@ static int fill_pid(pid_t pid, struct task_struct *tsk, /* fill in basic acct fields */ stats->version = TASKSTATS_VERSION; + stats->nvcsw = tsk->nvcsw; + stats->nivcsw = tsk->nivcsw; bacct_add_tsk(stats, tsk); /* fill in extended acct fields */ @@ -242,6 +244,8 @@ static int fill_tgid(pid_t tgid, struct task_struct *first, */ delayacct_add_tsk(stats, tsk); + stats->nvcsw += tsk->nvcsw; + stats->nivcsw += tsk->nivcsw; } while_each_thread(first, tsk); unlock_task_sighand(first, &flags); |