linux-kernel - Re: kernel 3.0: BUG: soft lockup: find_get

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Date:	Fri, 21 Oct 2011 10:07:05 +0200
From:	Pawel Sikora <pluto@...k.net>
To:	Nai Xia <nai.xia@...il.com>
Cc:	Hugh Dickins <hughd@...gle.com>, arekm@...-linux.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-mm@...ck.org, Mel Gorman <mgorman@...e.de>,
	jpiszcz@...idpixels.com, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: kernel 3.0: BUG: soft lockup: find_get_pages+0x51/0x110

On Friday 21 of October 2011 14:22:37 Nai Xia wrote:

> And as a side note. Since I notice that Pawel's workload may include OOM,

my last tests on patched (3.0.4 + migrate.c fix + vserver) kernel produce full cpu load
on dual 8-cores opterons like on this htop screenshot -> http://pluto.agmk.net/kernel/screen1.png
afaics all userspace applications usualy don't use more than half of physical memory
and so called "cache" on htop bar doesn't reach the 100%.

the patched kernel with disabled CONFIG_TRANSPARENT_HUGEPAGE (new thing in 2.6.38)
died at night, so now i'm going to disable also CONFIG_COMPACTION/MIGRATION in next
steps and stress this machine again...

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