From: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
To: "Ricardo Cañuelo" <ricardo.canuelo@collabora.com>
Cc: Michal Hocko <mhocko@suse.com>, Petr Mladek <pmladek@suse.com>,
akpm@linux-foundation.org, kernel@collabora.com, hch@lst.de,
guro@fb.com, rientjes@google.com, mcgrof@kernel.org,
keescook@chromium.org, yzaikin@google.com, linux-mm@kvack.org,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [PATCH] mm, oom: enable rate-limiting controls for oom dumps
Date: Tue, 13 Oct 2020 09:40:27 +0900 [thread overview]
Message-ID: <87993bef-3f83-0527-fa52-4f2c28eb7e56@i-love.sakura.ne.jp> (raw)
In-Reply-To: <20201012154114.GJ29725@dhcp22.suse.cz>
On 2020/10/13 0:41, Michal Hocko wrote:
>> What about introducing some feedback from the printk code?
>>
>> static u64 printk_last_report_seq;
>>
>> if (consoles_seen(printk_last_report_seq)) {
>> dump_header();
>> printk_last_report_seq = printk_get_last_seq();
>> }
>>
>> By other words. It would skip the massive report when the consoles
>> were not able to see the previous one.
>
> I am pretty sure this has been discussed in the past but maybe we really
> want to make ratelimit to work reasonably also for larger sections
> instead. Current implementation only really works if the rate limited
> operation is negligible wrt to the interval. Can we have a ratelimit
> alternative with a scope effect (effectivelly lock like semantic)?
> if (rate_limit_begin(&oom_rs)) {
> dump_header();
> rate_limit_end(&oom_rs);
> }
>
> rate_limi_begin would act like a try lock with additional constrain on
> the period/cadence based on rate_limi_end marked values.
>
Here is one of past discussions.
https://lkml.kernel.org/r/7de2310d-afbd-e616-e83a-d75103b986c6@i-love.sakura.ne.jp
https://lkml.kernel.org/r/20190830103504.GA28313@dhcp22.suse.cz
https://lkml.kernel.org/r/57be50b2-a97a-e559-e4bd-10d923895f83@i-love.sakura.ne.jp
Michal Hocko complained about different OOM domains, and now just ignores it...
Proper ratelimiting for OOM messages had better not to count on asynchronous printk().
next prev parent reply other threads:[~2020-10-13 0:41 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-09 9:30 Ricardo Cañuelo
2020-10-12 15:18 ` Michal Hocko
2020-10-13 9:23 ` Ricardo Cañuelo
2020-10-13 11:56 ` Michal Hocko
2020-10-12 15:22 ` Petr Mladek
2020-10-12 15:41 ` Michal Hocko
2020-10-13 0:40 ` Tetsuo Handa [this message]
2020-10-13 7:25 ` Michal Hocko
2020-10-13 9:02 ` Petr Mladek
2020-10-13 10:46 ` Tetsuo Handa
2020-10-15 13:05 ` Petr Mladek
2020-10-13 9:18 ` Ricardo Cañuelo
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87993bef-3f83-0527-fa52-4f2c28eb7e56@i-love.sakura.ne.jp \
--to=penguin-kernel@i-love.sakura.ne.jp \
--cc=akpm@linux-foundation.org \
--cc=guro@fb.com \
--cc=hch@lst.de \
--cc=keescook@chromium.org \
--cc=kernel@collabora.com \
--cc=linux-mm@kvack.org \
--cc=mcgrof@kernel.org \
--cc=mhocko@suse.com \
--cc=pmladek@suse.com \
--cc=ricardo.canuelo@collabora.com \
--cc=rientjes@google.com \
--cc=rostedt@goodmis.org \
--cc=sergey.senozhatsky@gmail.com \
--cc=yzaikin@google.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox