linux-kernel - Re: [PATCH RFC 00/15] mm: memory book keeping and lru

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Message-ID: <alpine.LSU.2.00.1202171803380.25191@eggly.anvils>
Date:	Fri, 17 Feb 2012 18:13:37 -0800 (PST)
From:	Hugh Dickins <hughd@...gle.com>
To:	Hugh Dickins <hughd@...gle.com>
cc:	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Ying Han <yinghan@...gle.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC 00/15] mm: memory book keeping and lru_lock
 splitting

On Thu, 16 Feb 2012, Hugh Dickins wrote:
> 
> Yours are not the only patches I was testing in that tree, I tried to
> gather several other series which I should be reviewing if I ever have
> time: Kamezawa-san's page cgroup diet 6, Xiao Guangrong's 4 prio_tree
> cleanups, your 3 radix_tree changes, your 6 shmem changes, your 4 memcg
> miscellaneous, and then your 15 books.
> 
> The tree before your final 15 did well under pressure, until I tried to
> rmdir one of the cgroups afterwards: then it crashed nastily, I'll have
> to bisect into that, probably either Kamezawa's or your memcg changes.

So far I haven't succeeded in reproducing that at all: it was real,
but obviously harder to get than I assumed - indeed, no good reason
to associate it with any of those patches, might even be in 3.3-rc.

It did involve a NULL pointer dereference in mem_cgroup_page_lruvec(),
somewhere below compact_zone() - but repercussions were causing the
stacktrace to scroll offscreen, so I didn't get good details.

Hugh
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