From: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
To: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: sergey.senozhatsky@gmail.com, mhocko@suse.com,
linux-mm@kvack.org, pmladek@suse.cz
Subject: Re: [PATCH] mm/page_alloc: Wait for oom_lock before retrying.
Date: Mon, 26 Dec 2016 20:41:06 +0900 [thread overview]
Message-ID: <20161226114106.GB515@tigerII.localdomain> (raw)
In-Reply-To: <201612261954.FJE69201.OFLVtFJSQFOHMO@I-love.SAKURA.ne.jp>
On (12/26/16 19:54), Tetsuo Handa wrote:
> I tried these 9 patches. Generally OK.
>
> Although there is still "schedule_timeout_killable() lockup with oom_lock held"
> problem, async-printk patches help avoiding "printk() lockup with oom_lock held"
> problem. Thank you.
>
> Three comments from me.
>
> (1) Messages from e.g. SysRq-b is not waited for sent to consoles.
> "SysRq : Resetting" line is needed as a note that I gave up waiting.
>
> (2) Messages from e.g. SysRq-t should be sent to consoles synchronously?
> "echo t > /proc/sysrq-trigger" case can use asynchronous printing.
> But since ALT-SysRq-T sequence from keyboard may be used when scheduler
> is not responding, it might be better to use synchronous printing.
> (Or define a magic key sequence to toggle synchronous/asynchronous?)
it's really hard to tell if the message comes from sysrq or from
somewhere else. the current approach -- switch to *always* sync printk
once we see the first LOGLEVEL_EMERG message. so you can add
printk(LOGLEVEL_EMERG "sysrq-t\n"); for example, and printk will
switch to sync mode. sync mode, is might be a bit dangerous though,
since we printk from IRQ.
-ss
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next prev parent reply other threads:[~2016-12-26 11:41 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-06 10:33 [PATCH] mm/page_alloc: Wait for oom_lock before retrying Tetsuo Handa
2016-12-07 8:15 ` Michal Hocko
2016-12-07 15:29 ` Tetsuo Handa
2016-12-08 8:20 ` Vlastimil Babka
2016-12-08 11:00 ` Tetsuo Handa
2016-12-08 13:32 ` Michal Hocko
2016-12-08 16:18 ` Sergey Senozhatsky
2016-12-08 13:27 ` Michal Hocko
2016-12-09 14:23 ` Tetsuo Handa
2016-12-09 14:46 ` Michal Hocko
2016-12-10 11:24 ` Tetsuo Handa
2016-12-12 9:07 ` Michal Hocko
2016-12-12 11:49 ` Petr Mladek
2016-12-12 13:00 ` Michal Hocko
2016-12-12 14:05 ` Tetsuo Handa
2016-12-13 1:06 ` Sergey Senozhatsky
2016-12-12 12:12 ` Tetsuo Handa
2016-12-12 12:55 ` Michal Hocko
2016-12-12 13:19 ` Michal Hocko
2016-12-13 12:06 ` Tetsuo Handa
2016-12-13 17:06 ` Michal Hocko
2016-12-14 11:37 ` Tetsuo Handa
2016-12-14 12:42 ` Michal Hocko
2016-12-14 16:36 ` Tetsuo Handa
2016-12-14 18:18 ` Michal Hocko
2016-12-15 10:21 ` Tetsuo Handa
2016-12-19 11:25 ` Tetsuo Handa
2016-12-19 12:27 ` Sergey Senozhatsky
2016-12-20 15:39 ` Sergey Senozhatsky
2016-12-22 10:27 ` Tetsuo Handa
2016-12-22 10:53 ` Petr Mladek
2016-12-22 13:40 ` Sergey Senozhatsky
2016-12-22 13:33 ` Tetsuo Handa
2016-12-22 19:24 ` Michal Hocko
2016-12-24 6:25 ` Tetsuo Handa
2016-12-26 11:49 ` Michal Hocko
2016-12-27 10:39 ` Tetsuo Handa
2016-12-27 10:57 ` Michal Hocko
2016-12-22 13:42 ` Sergey Senozhatsky
2016-12-22 14:01 ` Tetsuo Handa
2016-12-22 14:09 ` Sergey Senozhatsky
2016-12-22 14:30 ` Sergey Senozhatsky
2016-12-26 10:54 ` Tetsuo Handa
2016-12-26 11:34 ` Sergey Senozhatsky
2017-01-12 13:10 ` Petr Mladek
2017-01-13 2:52 ` Sergey Senozhatsky
2017-01-13 3:53 ` Sergey Senozhatsky
2017-01-13 11:15 ` Petr Mladek
2017-01-13 11:14 ` Petr Mladek
2017-01-12 14:18 ` Petr Mladek
2017-01-13 2:28 ` Sergey Senozhatsky
2017-01-13 11:03 ` Petr Mladek
2017-01-13 11:50 ` Sergey Senozhatsky
2017-01-13 12:15 ` Petr Mladek
2016-12-26 11:41 ` Sergey Senozhatsky [this message]
2017-01-13 14:03 ` Petr Mladek
2016-12-15 1:11 ` Sergey Senozhatsky
2016-12-15 6:35 ` Michal Hocko
2016-12-15 10:16 ` Petr Mladek
2016-12-14 9:37 ` Petr Mladek
2016-12-14 10:20 ` Sergey Senozhatsky
2016-12-14 11:01 ` Petr Mladek
2016-12-14 12:23 ` Sergey Senozhatsky
2016-12-14 12:47 ` Petr Mladek
2016-12-14 10:26 ` Michal Hocko
2016-12-15 7:34 ` Sergey Senozhatsky
2016-12-14 11:37 ` Tetsuo Handa
2016-12-14 12:36 ` Petr Mladek
2016-12-14 12:44 ` Michal Hocko
2016-12-14 13:36 ` Tetsuo Handa
2016-12-14 13:52 ` Michal Hocko
2016-12-14 12:50 ` Sergey Senozhatsky
2016-12-12 14:59 ` Tetsuo Handa
2016-12-12 15:55 ` Michal Hocko
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