From: Christoph Lameter <cl@linux.com>
To: Michal Hocko <mhocko@suse.cz>
Cc: Vinayak Menon <vinmenon@codeaurora.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
akpm@linux-foundation.org, hannes@cmpxchg.org,
vdavydov@parallels.com, mgorman@suse.de, minchan@kernel.org
Subject: Re: [PATCH v2] mm: vmscan: fix the page state calculation in too_many_isolated
Date: Thu, 22 Jan 2015 10:11:31 -0600 (CST) [thread overview]
Message-ID: <alpine.DEB.2.11.1501221010510.3937@gentwo.org> (raw)
In-Reply-To: <20150121143920.GD23700@dhcp22.suse.cz>
On Wed, 21 Jan 2015, Michal Hocko wrote:
> I think we can solve this as well. We can stick vmstat_shepherd into a
> kernel thread with a loop with the configured timeout and then create a
> mask of CPUs which need the update and run vmstat_update from
> IPI context (smp_call_function_many).
Please do not run the vmstat_updates concurrently. They update shared
cachelines and therefore can cause bouncing cachelines if run concurrently
on multiple cpus.
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Lameter <cl@linux.com>
To: Michal Hocko <mhocko@suse.cz>
Cc: Vinayak Menon <vinmenon@codeaurora.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
akpm@linux-foundation.org, hannes@cmpxchg.org,
vdavydov@parallels.com, mgorman@suse.de, minchan@kernel.org
Subject: Re: [PATCH v2] mm: vmscan: fix the page state calculation in too_many_isolated
Date: Thu, 22 Jan 2015 10:11:31 -0600 (CST) [thread overview]
Message-ID: <alpine.DEB.2.11.1501221010510.3937@gentwo.org> (raw)
In-Reply-To: <20150121143920.GD23700@dhcp22.suse.cz>
On Wed, 21 Jan 2015, Michal Hocko wrote:
> I think we can solve this as well. We can stick vmstat_shepherd into a
> kernel thread with a loop with the configured timeout and then create a
> mask of CPUs which need the update and run vmstat_update from
> IPI context (smp_call_function_many).
Please do not run the vmstat_updates concurrently. They update shared
cachelines and therefore can cause bouncing cachelines if run concurrently
on multiple cpus.
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2015-01-22 16:11 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-14 11:36 [PATCH v2] mm: vmscan: fix the page state calculation in too_many_isolated Vinayak Menon
2015-01-14 11:36 ` Vinayak Menon
2015-01-14 16:50 ` Michal Hocko
2015-01-14 16:50 ` Michal Hocko
2015-01-15 17:24 ` Vinayak Menon
2015-01-15 17:24 ` Vinayak Menon
2015-01-16 15:49 ` Michal Hocko
2015-01-16 15:49 ` Michal Hocko
2015-01-16 17:57 ` Michal Hocko
2015-01-16 17:57 ` Michal Hocko
2015-01-16 19:17 ` Christoph Lameter
2015-01-16 19:17 ` Christoph Lameter
2015-01-17 15:18 ` Vinayak Menon
2015-01-17 15:18 ` Vinayak Menon
2015-01-17 19:48 ` Christoph Lameter
2015-01-17 19:48 ` Christoph Lameter
2015-01-19 4:27 ` Vinayak Menon
2015-01-19 4:27 ` Vinayak Menon
2015-01-21 14:39 ` Michal Hocko
2015-01-21 14:39 ` Michal Hocko
2015-01-22 15:16 ` Vlastimil Babka
2015-01-22 15:16 ` Vlastimil Babka
2015-01-22 16:11 ` Christoph Lameter [this message]
2015-01-22 16:11 ` Christoph Lameter
2015-01-26 17:46 ` Michal Hocko
2015-01-26 17:46 ` Michal Hocko
2015-01-26 18:35 ` Christoph Lameter
2015-01-26 18:35 ` Christoph Lameter
2015-01-27 10:52 ` Michal Hocko
2015-01-27 10:52 ` Michal Hocko
2015-01-27 16:59 ` Christoph Lameter
2015-01-27 16:59 ` Christoph Lameter
2015-01-30 15:28 ` Michal Hocko
2015-01-30 15:28 ` Michal Hocko
2015-01-26 17:28 ` Michal Hocko
2015-01-26 17:28 ` Michal Hocko
2015-01-26 18:35 ` Christoph Lameter
2015-01-26 18:35 ` Christoph Lameter
2015-01-26 22:11 ` Andrew Morton
2015-01-26 22:11 ` Andrew Morton
2015-01-27 10:41 ` Michal Hocko
2015-01-27 10:41 ` Michal Hocko
2015-01-27 10:33 ` Vinayak Menon
2015-01-27 10:33 ` Vinayak Menon
2015-01-27 10:45 ` Michal Hocko
2015-01-27 10:45 ` Michal Hocko
2015-01-29 17:32 ` Christoph Lameter
2015-01-29 17:32 ` Christoph Lameter
2015-01-30 15:27 ` Michal Hocko
2015-01-30 15:27 ` Michal Hocko
2015-01-16 1:17 ` Andrew Morton
2015-01-16 1:17 ` Andrew Morton
2015-01-16 5:10 ` Vinayak Menon
2015-01-16 5:10 ` Vinayak Menon
2015-01-17 16:29 ` Vinayak Menon
2015-01-17 16:29 ` Vinayak Menon
2015-02-11 22:14 ` Andrew Morton
2015-02-11 22:14 ` Andrew Morton
2015-02-12 16:19 ` Vlastimil Babka
2015-02-12 16:19 ` Vlastimil Babka
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=alpine.DEB.2.11.1501221010510.3937@gentwo.org \
--to=cl@linux.com \
--cc=akpm@linux-foundation.org \
--cc=hannes@cmpxchg.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mgorman@suse.de \
--cc=mhocko@suse.cz \
--cc=minchan@kernel.org \
--cc=vdavydov@parallels.com \
--cc=vinmenon@codeaurora.org \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.