From: Markus Trippelsdorf <markus@trippelsdorf.de>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: linux-mm@kvack.org
Subject: Re: isolate_freepages_block(): very high intermittent overhead
Date: Thu, 6 Nov 2014 12:53:22 +0100 [thread overview]
Message-ID: <20141106115322.GA17467@x4> (raw)
In-Reply-To: <545B5E90.6070902@suse.cz>
On 2014.11.06 at 12:42 +0100, Vlastimil Babka wrote:
> On 10/28/2014 09:59 AM, Markus Trippelsdorf wrote:
> > On 2014.10.27 at 23:01 +0100, Vlastimil Babka wrote:
> >> On 10/27/2014 09:40 PM, Markus Trippelsdorf wrote:
> >> > On my v3.18-rc2 kernel isolate_freepages_block() sometimes shows up very
> >> > high (>20%) in perf top during the configuration phase of software
> >> > builds. It increases build time considerably.
> >> >
> >> > Unfortunately the issue is not 100% reproducible, because it appears
> >> > only intermittently. And the symptoms vanish after a few minutes.
> >>
> >> Does it happen for long enough so you can capture it by perf record -g ?
> >
> > It only happens when I use the "Lockless Allocator":
> > http://locklessinc.com/downloads/lockless_allocator_src.tgz
> >
> > I use: LD_PRELOAD=/usr/lib/libllalloc.so.1.3 when building software,
> > because it gives me a ~8% speed boost over glibc's malloc.
>
> I tried the allocator while updating my gentoo desktop with 3.18-rc3 and adding
> some extra memory pressure, but didn't observe anything like this. It could be
> system specific. If you do't have the time to debug, can you at least send me
> output of "cat /proc/zoneinfo"?
I will try to debug this further this weekend.
BTW there is an interesting thread on LKML that might be related to this
issue: https://lkml.org/lkml/2014/11/4/904
--
Markus
--
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>
prev parent reply other threads:[~2014-11-06 11:53 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-27 20:40 isolate_freepages_block(): very high intermittent overhead Markus Trippelsdorf
2014-10-27 21:06 ` Markus Trippelsdorf
2014-10-27 22:01 ` Vlastimil Babka
2014-10-28 8:59 ` Markus Trippelsdorf
2014-10-29 15:08 ` Vlastimil Babka
2014-11-06 11:42 ` Vlastimil Babka
2014-11-06 11:53 ` Markus Trippelsdorf [this message]
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=20141106115322.GA17467@x4 \
--to=markus@trippelsdorf.de \
--cc=linux-mm@kvack.org \
--cc=vbabka@suse.cz \
/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).