linux-kernel - Re: [Xen-devel] [PATCH] xen-blkback: fix memory leak when persistent grants are used

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Message-ID: <ecc2d6a2-e9c9-43a0-afe5-abca9ea47b07@email.android.com>
Date:	Sun, 26 Jan 2014 13:01:14 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Matt Wilson <msw@...ux.com>, Ian Campbell <Ian.Campbell@...rix.com>
CC:	Matt Wilson <msw@...zon.com>, linux-kernel@...r.kernel.org,
	xen-devel@...ts.xen.org, Matt Rushton <mrushton@...zon.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Anthony Liguori <aliguori@...zon.com>,
	Roger Pau Monné <roger.pau@...rix.com>
Subject: Re: [Xen-devel] [PATCH] xen-blkback: fix memory leak when persistent grants are used

Matt Wilson <msw@...ux.com> wrote:
>On Fri, Jan 24, 2014 at 03:36:22PM +0000, Ian Campbell wrote:
>> On Fri, 2014-01-24 at 09:21 +0000, Ian Campbell wrote:
>> > On Thu, 2014-01-23 at 11:28 -0800, Matt Wilson wrote:
>> > > From: Matt Rushton <mrushton@...zon.com>
>> > > 
>> > > Currently shrink_free_pagepool() is called before the pages used
>for
>> > > persistent grants are released via free_persistent_gnts(). This
>> > > results in a memory leak when a VBD that uses persistent grants
>is
>> > > torn down.
>> > 
>> > This may well be the explanation for the memory leak I was
>observing on
>> > ARM last night. I'll give it a go and let you know.
>> 
>> Results are a bit inconclusive unfortunately, it seems like I am
>seeing
>> some other leak too (or instead).
>> 
>> Totally unscientifically it does seem to be leaking more slowly than
>> before, so perhaps this patch has helped, but nothing conclusive I'm
>> afraid.
>
>Testing here looks good. I don't know if perhaps something else is
>going on with ARM...
>
>> I don't think that quite qualifies for a Tested-by though, sorry.
>
>How about an Acked-by? ;-)
>
>--msw


How big and often does this leak occur - that this patch fixes?

I think there is one comment from Roger that needs to be addressed? Maybe I missed the resolution?

Thanks!
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