From: Linus Torvalds <torvalds@linux-foundation.org>
To: Hugh Dickins <hughd@google.com>, Oleg Nesterov <oleg@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>, Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Tim Chen <tim.c.chen@linux.intel.com>,
Michal Hocko <mhocko@suse.com>
Subject: Re: [RFC PATCH] mm: silence soft lockups from unlock_page
Date: Wed, 22 Jul 2020 17:23:03 -0700 [thread overview]
Message-ID: <CAHk-=wiqzsK_c_jUXFnSXeumsRQpYEwv0Xbi3MiGKLcVxS2_kg@mail.gmail.com> (raw)
In-Reply-To: <CAHk-=whEjnsANEhTA3aqpNLZ3vv7huP7QAmcAEd-GUxm2YMo-Q@mail.gmail.com>
On Wed, Jul 22, 2020 at 4:42 PM Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> NOTE NOTE NOTE! This is both somewhat subtle code, and ENTIRELY
> UNTESTED.
It seems to boot.
It adds more lines than it removes, but a lot of it is comments, and
while it's somewhat subtle, I think it's actually conceptually simpler
than what we had before.
The actual waiting loop itself, for example, is now entirely and
utterly trivial.
The DROP behavior is also a lot more straightforward and logical, imnsho.
The biggest annoyance I have with it is how it open-codes
"finish_wait()", and honestly, the "proper" fix for that would likely
be to simply instead make "finish_wait()" return the "did I need to
remove it from the list or not" value. That's the only reason that
patch open-codes it right now.
It _feels_ like the right solution to this thing.
But maybe that's just the "pee in the snow" effect, where I like it
only because I've put my mark on it.
So it would be good to get more opinions, and perhaps more testing
than my limited "it boots and works for me, and I can still build
kernels and run a browser".
Linus
next prev parent reply other threads:[~2020-07-23 0:23 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-21 6:32 [RFC PATCH] mm: silence soft lockups from unlock_page Michal Hocko
2020-07-21 11:10 ` Qian Cai
2020-07-21 11:25 ` Michal Hocko
2020-07-21 11:44 ` Qian Cai
2020-07-21 12:17 ` Michal Hocko
2020-07-21 13:23 ` Qian Cai
2020-07-21 13:38 ` Michal Hocko
2020-07-21 14:15 ` Qian Cai
2020-07-21 14:17 ` Chris Down
2020-07-21 15:00 ` Michal Hocko
2020-07-21 15:33 ` Linus Torvalds
2020-07-21 15:49 ` Michal Hocko
2020-07-22 18:29 ` Linus Torvalds
2020-07-22 21:29 ` Hugh Dickins
2020-07-22 22:10 ` Linus Torvalds
2020-07-22 23:42 ` Linus Torvalds
2020-07-23 0:23 ` Linus Torvalds [this message]
2020-07-23 12:47 ` Oleg Nesterov
2020-07-23 17:32 ` Linus Torvalds
2020-07-23 18:01 ` Oleg Nesterov
2020-07-23 18:22 ` Linus Torvalds
2020-07-23 19:03 ` Linus Torvalds
2020-07-24 14:45 ` Oleg Nesterov
2020-07-23 20:03 ` Linus Torvalds
2020-07-23 23:11 ` Hugh Dickins
2020-07-23 23:43 ` Linus Torvalds
2020-07-24 0:07 ` Hugh Dickins
2020-07-24 0:46 ` Linus Torvalds
2020-07-24 3:45 ` Hugh Dickins
2020-07-24 15:24 ` Oleg Nesterov
2020-07-24 17:32 ` Linus Torvalds
2020-07-24 23:25 ` Linus Torvalds
2020-07-25 2:08 ` Hugh Dickins
2020-07-25 2:46 ` Linus Torvalds
2020-07-25 10:14 ` Oleg Nesterov
2020-07-25 18:48 ` Linus Torvalds
2020-07-25 19:27 ` Oleg Nesterov
2020-07-25 19:51 ` Linus Torvalds
2020-07-26 13:57 ` Oleg Nesterov
2020-07-25 21:19 ` Hugh Dickins
2020-07-26 4:22 ` Hugh Dickins
2020-07-26 20:30 ` Hugh Dickins
2020-07-26 20:41 ` Linus Torvalds
2020-07-26 22:09 ` Hugh Dickins
2020-07-27 19:35 ` Greg KH
2020-08-06 5:46 ` Hugh Dickins
2020-08-18 13:50 ` Greg KH
2020-08-06 5:21 ` Hugh Dickins
2020-08-06 17:07 ` Linus Torvalds
2020-08-06 18:00 ` Matthew Wilcox
2020-08-06 18:32 ` Linus Torvalds
2020-08-07 18:41 ` Hugh Dickins
2020-08-07 19:07 ` Linus Torvalds
2020-08-07 19:35 ` Matthew Wilcox
2020-08-03 13:14 ` Michal Hocko
2020-08-03 17:56 ` Linus Torvalds
2020-07-25 9:39 ` Oleg Nesterov
2020-07-23 8:03 ` Michal Hocko
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