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authorMaxim Uvarov <muvarov@ru.mvista.com>2007-07-15 23:40:48 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-16 09:05:46 -0700
commitb663a79c191508f27cd885224b592a878c0ba0f6 (patch)
tree270a0472bf1fb0c7323ecb60ec68e40d02dcb1b4 /fs/proc/array.c
parenta6c15c2b0fbfd5c0a84f5f0e1e3f20f85d2b8692 (diff)
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.c10
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;
}