From: Oleg Nesterov <oleg@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Nick Piggin <npiggin@gmail.com>,
Mel Gorman <mgorman@techsingularity.net>, Jan Kara <jack@suse.cz>,
Davidlohr Bueso <dave@stgolabs.net>,
Andi Kleen <ak@linux.intel.com>,
Lukas Czerner <lczerner@redhat.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: wait_on_page_bit_common(TASK_KILLABLE, EXCLUSIVE) can miss wakeup?
Date: Mon, 29 Jun 2020 17:13:41 +0200 [thread overview]
Message-ID: <20200629151340.GC20323@redhat.com> (raw)
In-Reply-To: <CAHk-=whvVWNXPJq1k566zn4SfXAifXtiA7T+7JFweR3rQ0nc9A@mail.gmail.com>
On 06/27, Linus Torvalds wrote:
>
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -1150,6 +1150,12 @@ static inline int wait_on_page_bit_common(wait_queue_head_t *q,
> io_schedule();
>
> if (behavior == EXCLUSIVE) {
> + /*
> + * Make sure we don't get any exclusive wakeups
> + * after this point!
> + */
> + __set_current_state(TASK_RUNNING);
> + smp_mb__before_atomic();
> if (!test_and_set_bit_lock(bit_nr, &page->flags))
> break;
> } else if (behavior == SHARED) {
FWIW,
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
next prev parent reply other threads:[~2020-06-29 19:14 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-24 16:11 wait_on_page_bit_common(TASK_KILLABLE, EXCLUSIVE) can miss wakeup? Oleg Nesterov
2020-06-24 16:20 ` Oleg Nesterov
2020-06-24 16:36 ` Linus Torvalds
2020-06-26 15:43 ` Peter Zijlstra
2020-06-28 5:39 ` Linus Torvalds
2020-06-28 13:18 ` Peter Zijlstra
2020-06-29 3:28 ` Nicholas Piggin
2020-06-29 13:16 ` Nicholas Piggin
2020-06-29 16:36 ` Linus Torvalds
2020-06-30 2:12 ` Nicholas Piggin
2020-06-29 14:02 ` Oleg Nesterov
2020-06-30 2:08 ` Nicholas Piggin
2020-06-30 6:17 ` Oleg Nesterov
2020-06-30 9:08 ` Nicholas Piggin
2020-06-30 10:53 ` Oleg Nesterov
2020-06-30 11:36 ` Oleg Nesterov
2020-06-30 11:50 ` Oleg Nesterov
2020-06-30 18:02 ` Linus Torvalds
2020-06-30 18:29 ` Oleg Nesterov
2020-06-30 18:57 ` Linus Torvalds
2020-06-29 15:13 ` Oleg Nesterov [this message]
2020-06-24 16:22 ` Linus Torvalds
2020-06-24 16:43 ` Oleg Nesterov
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