From: Vlastimil Babka <vbabka@suse.cz>
To: Markus Trippelsdorf <markus@trippelsdorf.de>
Cc: linux-mm@kvack.org
Subject: Re: isolate_freepages_block(): very high intermittent overhead
Date: Thu, 06 Nov 2014 12:42:08 +0100 [thread overview]
Message-ID: <545B5E90.6070902@suse.cz> (raw)
In-Reply-To: <20141028085916.GA337@x4>
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"?
Thanks,
Vlastimil
> Unfortunately, I don't have time to debug this further and have disabled
> "Transparent Hugepage Support" for now.
>
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next prev parent reply other threads:[~2014-11-06 11:42 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 [this message]
2014-11-06 11:53 ` Markus Trippelsdorf
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