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| author | Maxim Uvarov <muvarov@ru.mvista.com> | 2007-07-16 10:40:48 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-16 20:05:46 +0400 |
| commit | b663a79c191508f27cd885224b592a878c0ba0f6 (patch) | |
| tree | 270a0472bf1fb0c7323ecb60ec68e40d02dcb1b4 /fs/proc/array.c | |
| parent | a6c15c2b0fbfd5c0a84f5f0e1e3f20f85d2b8692 (diff) | |
| download | linux-b663a79c191508f27cd885224b592a878c0ba0f6.tar.xz | |
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 'fs/proc/array.c')
| -rw-r--r-- | fs/proc/array.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/proc/array.c b/fs/proc/array.c index 680c913575f0..9cbab7e93557 100644 --- a/fs/proc/array.c +++ b/fs/proc/array.c @@ -289,6 +289,15 @@ static inline char *task_cap(struct task_struct *p, char *buffer) cap_t(p->cap_effective)); } +static inline char *task_context_switch_counts(struct task_struct *p, + char *buffer) +{ + return buffer + sprintf(buffer, "voluntary_ctxt_switches:\t%lu\n" + "nonvoluntary_ctxt_switches:\t%lu\n", + p->nvcsw, + p->nivcsw); +} + int proc_pid_status(struct task_struct *task, char * buffer) { char * orig = buffer; @@ -307,6 +316,7 @@ int proc_pid_status(struct task_struct *task, char * buffer) #if defined(CONFIG_S390) buffer = task_show_regs(task, buffer); #endif + buffer = task_context_switch_counts(task, buffer); return buffer - orig; } |