The patch titled
posix_cpu_timers_exit_group(): do not use thread_group_cputimer()
has been added to the -mm tree. Its filename is
posix_cpu_timers_exit_group-do-not-use-thread_group_cputimer.patch
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------------------------------------------------------
Subject: posix_cpu_timers_exit_group(): do not use thread_group_cputimer()
From: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>
When the process exits we don't have to run new cputimer nor use running
one (as it not accounts when tsk->exit_state != 0) to get process CPU
times. As there is only one thread we can just use CPU times fields from
task and signal structs.
Signed-off-by: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Roland McGrath <roland@xxxxxxxxxx>
Cc: Vitaly Mayatskikh <vmayatsk@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/posix-cpu-timers.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff -puN kernel/posix-cpu-timers.c~posix_cpu_timers_exit_group-do-not-use-thread_group_cputimer kernel/posix-cpu-timers.c
--- a/kernel/posix-cpu-timers.c~posix_cpu_timers_exit_group-do-not-use-thread_group_cputimer
+++ a/kernel/posix-cpu-timers.c
@@ -521,11 +521,12 @@ void posix_cpu_timers_exit(struct task_s
}
void posix_cpu_timers_exit_group(struct task_struct *tsk)
{
- struct task_cputime cputime;
+ struct signal_struct *const sig = tsk->signal;
- thread_group_cputimer(tsk, &cputime);
cleanup_timers(tsk->signal->cpu_timers,
- cputime.utime, cputime.stime, cputime.sum_exec_runtime);
+ cputime_add(tsk->utime, sig->utime),
+ cputime_add(tsk->stime, sig->stime),
+ tsk->se.sum_exec_runtime + sig->sum_sched_runtime);
}
static void clear_dead_task(struct k_itimer *timer, union cpu_time_count now)
_
Patches currently in -mm which might be from sgruszka@xxxxxxxxxx are
origin.patch
posix_cpu_timers_exit_group-do-not-use-thread_group_cputimer.patch
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