* [GIT PULL] cgroup fixes for v5.4-rc7
@ 2019-11-11 20:22 Tejun Heo
2019-11-12 0:30 ` pr-tracker-bot
0 siblings, 1 reply; 2+ messages in thread
From: Tejun Heo @ 2019-11-11 20:22 UTC (permalink / raw)
To: Linus Torvalds; +Cc: linux-kernel, cgroups
Hello, Linus.
Sorry, I sat on this for too long.
There's an inadvertent preemption point in ptrace_stop() which was
reliably triggering for a test scenario significantly slowing it down.
This pull request contains Oleg's fix to remove the unwanted
preemption point.
Thanks.
The following changes since commit 9e208aa06c2109b45eec6be049a8e47034748c20:
Merge tag 'xfs-5.4-fixes-3' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux (2019-10-10 11:47:16 -0700)
are available in the Git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-5.4-fixes
for you to fetch changes up to 937c6b27c73e02cd4114f95f5c37ba2c29fadba1:
cgroup: freezer: call cgroup_enter_frozen() with preemption disabled in ptrace_stop() (2019-10-11 08:39:57 -0700)
----------------------------------------------------------------
Oleg Nesterov (1):
cgroup: freezer: call cgroup_enter_frozen() with preemption disabled in ptrace_stop()
kernel/signal.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/signal.c b/kernel/signal.c
index c4da1ef56fdf..bcd46f547db3 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2205,8 +2205,8 @@ static void ptrace_stop(int exit_code, int why, int clear_code, kernel_siginfo_t
*/
preempt_disable();
read_unlock(&tasklist_lock);
- preempt_enable_no_resched();
cgroup_enter_frozen();
+ preempt_enable_no_resched();
freezable_schedule();
cgroup_leave_frozen(true);
} else {
--
tejun
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [GIT PULL] cgroup fixes for v5.4-rc7
2019-11-11 20:22 [GIT PULL] cgroup fixes for v5.4-rc7 Tejun Heo
@ 2019-11-12 0:30 ` pr-tracker-bot
0 siblings, 0 replies; 2+ messages in thread
From: pr-tracker-bot @ 2019-11-12 0:30 UTC (permalink / raw)
To: Tejun Heo; +Cc: Linus Torvalds, linux-kernel, cgroups
The pull request you sent on Mon, 11 Nov 2019 12:22:03 -0800:
> git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-5.4-fixes
has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/de620fb99ef2bd52b2c5bc52656e89dcfc0e223a
Thank you!
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