From: Konstantin Khlebnikov <khlebnikov@openvz.org>
To: Zheng Liu <gnehzuil.liu@gmail.com>
Cc: linux-mm@kvack.org, muming.wq@taobao.com
Subject: Re: [question] call mark_page_accessed() in minor fault
Date: Tue, 23 Apr 2013 17:02:34 +0400 [thread overview]
Message-ID: <5176866A.2060400@openvz.org> (raw)
In-Reply-To: <20130423122542.GA5638@gmail.com>
Zheng Liu wrote:
> Hi all,
>
> Recently we meet a performance regression about mmaped page. When we upgrade
> our product system from 2.6.18 kernel to a latest kernel, such as 2.6.32 kernel,
> we will find that mmaped pages are reclaimed very quickly. We found that when
> we hit a minor fault mark_page_accessed() is called in 2.6.18 kernel, but in
> 2.6.32 kernel we don't call mark_page_accesed(). This means that mmaped pages
> in 2.6.18 kernel are activated and moved into active list. While in 2.6.32
> kernel mmaped pages are still kept in inactive list.
>
> So my question is why we call mark_page_accessed() in 2.6.18 kernel, but don't
> call it in 2.6.32 kernel. Has any reason here?
Behavior was changed in commit
v2.6.28-6130-gbf3f3bc "mm: don't mark_page_accessed in fault path"
Please see also commits
v3.2-4876-g34dbc67 "vmscan: promote shared file mapped pages" and
v3.2-4877-gc909e99 "vmscan: activate executable pages after first usage".
Probably they can solve some of your problems.
>
> Thanks in advance,
> - Zheng
>
> --
> 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>
--
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:[~2013-04-23 13:02 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-23 12:25 [question] call mark_page_accessed() in minor fault Zheng Liu
2013-04-23 13:02 ` Konstantin Khlebnikov [this message]
2013-04-23 13:49 ` Zheng Liu
2013-04-27 7:10 ` Simon Jeons
2013-04-27 7:55 ` Zheng Liu
2013-04-27 7:40 ` Simon Jeons
2013-04-27 11:14 ` Zheng Liu
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=5176866A.2060400@openvz.org \
--to=khlebnikov@openvz.org \
--cc=gnehzuil.liu@gmail.com \
--cc=linux-mm@kvack.org \
--cc=muming.wq@taobao.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;
as well as URLs for NNTP newsgroup(s).