linux-kernel - Re: [PATCH 0/2] shmem: fix faulting into a hole while it's punched, take 3

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Message-ID: <53C8FAA6.9050908@oracle.com>
Date:	Fri, 18 Jul 2014 06:44:54 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Vlastimil Babka <vbabka@...e.cz>, Hugh Dickins <hughd@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Konstantin Khlebnikov <koct9i@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michel Lespinasse <walken@...gle.com>,
	Lukas Czerner <lczerner@...hat.com>,
	Dave Jones <davej@...hat.com>, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] shmem: fix faulting into a hole while it's punched,
 take 3

On 07/17/2014 12:12 PM, Sasha Levin wrote:
> On 07/17/2014 12:10 PM, Vlastimil Babka wrote:
>> > On 07/15/2014 12:28 PM, Hugh Dickins wrote:
>>> >> In the end I decided that we had better look at it as two problems,
>>> >> the trinity faulting starvation, and the indefinite punching loop,
>>> >> so 1/2 and 2/2 present both solutions: belt and braces.
>> > 
>> > I tested that with my reproducer and it was OK, but as I already said, it's not trinity so I didn't observe the new problems in the first place.
> I've started seeing a new hang in the lru code, but I'm not sure if
> it's related to this patch or not (the locks are the same ones, but
> the location is very different).
> 
> I'm looking into that.

Hi Hugh,

The new hang I'm seeing is much simpler to analyse (compared to shmem_fallocate) and
doesn't seem to be related. I'll send a separate mail and Cc you just in case, but
I don't think that this patchset has anything to do with it.

Otherwise, I've been unable to reproduce the shmem_fallocate hang.


Thanks,
Sasha
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