The patch titled
signal: retarget_shared_pending: consider shared/unblocked signals only
has been added to the -mm tree. Its filename is
signal-retarget_shared_pending-consider-shared-unblocked-signals-only.patch
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------------------------------------------------------
Subject: signal: retarget_shared_pending: consider shared/unblocked signals only
From: Oleg Nesterov <oleg@xxxxxxxxxx>
exit_signals() checks signal_pending() before retarget_shared_pending()
but this is suboptimal. We can avoid the while_each_thread() loop in case
when there are no shared signals visible to us.
Add the has_pending_signals(shared_pending, blocked) check. We don not
use tsk->blocked directly but pass this sigset_t as an argument, this is
needed for the next patch.
Note: we can optimize this more. while_each_thread(t) can check
t->blocked into account and stop after every pending signal has the new
target.
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: "Nikita V. Youshchenko" <nyoushchenko@xxxxxxxxxx>
Cc: Matt Fleming <matt@xxxxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/signal.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff -puN kernel/signal.c~signal-retarget_shared_pending-consider-shared-unblocked-signals-only kernel/signal.c
--- a/kernel/signal.c~signal-retarget_shared_pending-consider-shared-unblocked-signals-only
+++ a/kernel/signal.c
@@ -2203,10 +2203,13 @@ relock:
* group-wide signal. Another thread should be notified now to take
* the signal since we will not.
*/
-static void retarget_shared_pending(struct task_struct *tsk)
+static void retarget_shared_pending(struct task_struct *tsk, sigset_t *blocked)
{
struct task_struct *t;
+ if (!has_pending_signals(&tsk->signal->shared_pending.signal, blocked))
+ return;
+
t = tsk;
while_each_thread(tsk, t) {
if (!signal_pending(t) && !(t->flags & PF_EXITING))
@@ -2232,7 +2235,7 @@ void exit_signals(struct task_struct *ts
if (!signal_pending(tsk))
goto out;
- retarget_shared_pending(tsk);
+ retarget_shared_pending(tsk, &tsk->blocked);
if (unlikely(tsk->group_stop & GROUP_STOP_PENDING) &&
task_participate_group_stop(tsk))
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
linux-next.patch
signal-introduce-retarget_shared_pending.patch
signal-retarget_shared_pending-consider-shared-unblocked-signals-only.patch
signal-sigprocmask-narrow-the-scope-of-sigloc.patch
signal-sigprocmask-should-do-retarget_shared_pending.patch
x86-signal-handle_signal-should-use-sigprocmask.patch
x86-signal-sys_rt_sigreturn-should-use-sigprocmask.patch
fs-execc-provide-the-correct-process-pid-to-the-pipe-helper.patch
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