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Subject[patch 4/4] taskstats: Export "cdata_acct" with taskstats
From: Michael Holzheu <holzheu@linux.vnet.ibm.com>

With this patch the (full) cumulative CPU time is added to "struct taskstats".
The CPU time is only returned for the thread group leader.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
---
include/linux/taskstats.h | 7 ++++++-
kernel/tsacct.c | 7 +++++++
2 files changed, 13 insertions(+), 1 deletion(-)

--- a/include/linux/taskstats.h
+++ b/include/linux/taskstats.h
@@ -33,7 +33,7 @@
*/


-#define TASKSTATS_VERSION 7
+#define TASKSTATS_VERSION 8
#define TS_COMM_LEN 32 /* should be >= TASK_COMM_LEN
* in linux/sched.h */

@@ -163,6 +163,11 @@ struct taskstats {
/* Delay waiting for memory reclaim */
__u64 freepages_count;
__u64 freepages_delay_total;
+ /* version 7 ends here */
+
+ /* All cumulative CPU time of dead children */
+ __u64 ac_cutime_acct; /* User CPU time [usec] */
+ __u64 ac_cstime_acct; /* System CPU time [usec] */
};


--- a/kernel/tsacct.c
+++ b/kernel/tsacct.c
@@ -31,6 +31,7 @@ void bacct_add_tsk(struct taskstats *sta
const struct cred *tcred;
struct timespec uptime, ts;
u64 ac_etime;
+ unsigned long flags;

BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);

@@ -71,6 +72,12 @@ void bacct_add_tsk(struct taskstats *sta
stats->ac_majflt = tsk->maj_flt;

strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));
+ if (tsk->tgid == tsk->pid && lock_task_sighand(tsk, &flags)) {
+ struct cdata *cd = &tsk->signal->cdata_acct;
+ stats->ac_cutime_acct = cputime_to_usecs(cd->utime);
+ stats->ac_cstime_acct = cputime_to_usecs(cd->stime);
+ unlock_task_sighand(tsk, &flags);
+ }
}




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