Commit 7d7185c8 authored by Oleg Nesterov's avatar Oleg Nesterov Committed by Linus Torvalds
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[PATCH] sys_times: don't take tasklist_lock

sys_times: don't take tasklist_lock
Signed-off-by: default avatarOleg Nesterov <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 5876700c
......@@ -1206,7 +1206,7 @@ asmlinkage long sys_times(struct tms __user * tbuf)
struct task_struct *t;
cputime_t utime, stime, cutime, cstime;
utime = tsk->signal->utime;
stime = tsk->signal->stime;
t = tsk;
......@@ -1216,20 +1216,9 @@ asmlinkage long sys_times(struct tms __user * tbuf)
t = next_thread(t);
} while (t != tsk);
* While we have tasklist_lock read-locked, no dying thread
* can be updating current->signal->[us]time. Instead,
* we got their counts included in the live thread loop.
* However, another thread can come in right now and
* do a wait call that updates current->signal->c[us]time.
* To make sure we always see that pair updated atomically,
* we take the siglock around fetching them.
cutime = tsk->signal->cutime;
cstime = tsk->signal->cstime;
tmp.tms_utime = cputime_to_clock_t(utime);
tmp.tms_stime = cputime_to_clock_t(stime);
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