From: Cong Wang <xiyou.wangcong@gmail.com>
To: Yang Shi <shy828301@gmail.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Michal Hocko <mhocko@suse.com>, Linux MM <linux-mm@kvack.org>
Subject: Re: [PATCH] mm: avoid blocking lock_page() in kcompactd
Date: Thu, 9 Jan 2020 20:51:51 -0800 [thread overview]
Message-ID: <CAM_iQpWr2HLkW=ZSjZmiOpJyUG7T1QaWQOSW7vi34hqd2L4Bmg@mail.gmail.com> (raw)
In-Reply-To: <CAM_iQpWvrR9cVA31tD7Mvx0yTN=NDXQ-NMYStH9UB3Rb6WzmeA@mail.gmail.com>
On Thu, Jan 9, 2020 at 5:01 PM Cong Wang <xiyou.wangcong@gmail.com> wrote:
> I tried to dump the process stacks after we saw the hung task
> with /proc/X/stack (apparently sysrq is not an option for production),
> but I didn't find anything useful. I didn't see any other process
> hung in lock_page() either, all mm-related kernel threads were sleeping
> (non-D) at the time I debugged. So, it is possible there was some place
> missing a unlock_page() too, which is too late to debug after the hung
> task was reported.
Never mind. I found the process locking the page, /proc/X/stack apparently
fools me by hiding page fault stack. :-/
next prev parent reply other threads:[~2020-01-10 4:52 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-09 22:56 [PATCH] mm: avoid blocking lock_page() in kcompactd Cong Wang
2020-01-10 0:28 ` Yang Shi
2020-01-10 0:28 ` Yang Shi
2020-01-10 1:01 ` Cong Wang
2020-01-10 1:01 ` Cong Wang
2020-01-10 4:51 ` Cong Wang [this message]
2020-01-10 4:51 ` Cong Wang
2020-01-10 7:38 ` Michal Hocko
2020-01-20 22:48 ` Cong Wang
2020-01-20 22:48 ` Cong Wang
2020-01-21 9:00 ` Michal Hocko
2020-01-26 19:53 ` Cong Wang
2020-01-26 19:53 ` Cong Wang
2020-01-26 23:39 ` Matthew Wilcox
2020-01-27 15:00 ` Michal Hocko
2020-01-27 19:06 ` Matthew Wilcox
2020-01-28 1:25 ` Yang Shi
2020-01-28 1:25 ` Yang Shi
2020-01-28 6:03 ` Matthew Wilcox
2020-01-28 8:17 ` Michal Hocko
2020-01-28 8:30 ` Matthew Wilcox
2020-01-28 9:13 ` Michal Hocko
2020-01-28 10:48 ` Matthew Wilcox
2020-01-28 11:39 ` Michal Hocko
2020-01-28 19:44 ` Cong Wang
2020-01-28 19:44 ` Cong Wang
2020-01-30 22:52 ` Cong Wang
2020-01-30 22:52 ` Cong Wang
2020-02-13 7:48 ` Michal Hocko
2020-02-13 16:46 ` Matthew Wilcox
2020-02-13 17:08 ` Michal Hocko
2020-02-14 4:27 ` Matthew Wilcox
2020-02-14 6:55 ` Michal Hocko
2020-01-27 14:49 ` Michal Hocko
2020-01-28 0:46 ` Cong Wang
2020-01-28 0:46 ` Cong Wang
2020-01-28 8:22 ` Michal Hocko
2020-01-10 9:22 ` Mel Gorman
2020-01-20 22:41 ` Cong Wang
2020-01-20 22:41 ` Cong Wang
2020-01-21 19:21 ` Yang Shi
2020-01-21 19:21 ` Yang Shi
2020-01-21 8:26 ` Hillf Danton
2020-01-21 9:06 ` Michal Hocko
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