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    Subject[PATCH] posix_cpu_timers_exit_group: do not use thread_group_cputimer()
    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 form task
    and signal structs.

    Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
    ---
    kernel/posix-cpu-timers.c | 7 ++++---
    1 files changed, 4 insertions(+), 3 deletions(-)

    diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
    index bece7c0..e33a21c 100644
    --- a/kernel/posix-cpu-timers.c
    +++ b/kernel/posix-cpu-timers.c
    @@ -521,11 +521,12 @@ void posix_cpu_timers_exit(struct task_struct *tsk)
    }
    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)
    --
    1.5.5.6


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