linux-kernel - Re: [PATCH v2] mm: dmapool: use provided gfp flags for all dma_alloc

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Message-ID: <20130123181029.GE20719@lunn.ch>
Date:	Wed, 23 Jan 2013 19:10:29 +0100
From:	Andrew Lunn <andrew@...n.ch>
To:	Soeren Moch <smoch@....de>
Cc:	Andrew Lunn <andrew@...n.ch>, Arnd Bergmann <arnd@...db.de>,
	Jason Cooper <jason@...edaemon.net>,
	Greg KH <gregkh@...uxfoundation.org>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org, Michal Hocko <mhocko@...e.cz>,
	linux-mm@...ck.org, Kyungmin Park <kyungmin.park@...sung.com>,
	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	linaro-mm-sig@...ts.linaro.org,
	linux-arm-kernel@...ts.infradead.org,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: [PATCH v2] mm: dmapool: use provided gfp flags for all
 dma_alloc_coherent() calls

> >>
> >
> >Now (in the last hour) stable, occasionally lower numbers:
> >3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396
> >3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396
> >3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396
> >3396 3396 3396 3396 3396 3396 3396 3396 3396 3365 3396 3394 3396 3396
> >3396 3396 3373 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396
> >3396 3353 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396
> >3394 3396 3396 3396 3396 3396 3396 3396
> >
> >Before the last pool exhaustion going down:
> >3395 3395 3389 3379 3379 3374 3367 3360 3352 3343 3343 3343 3342 3336
> >3332 3324 3318 3314 3310 3307 3305 3299 3290 3283 3279 3272 3266 3265
> >3247 3247 3247 3242 3236 3236
> >
> Here I stopped vdr (and so closed all dvb_demux devices), the number
> was remaining the same 3236, even after restart of vdr (and restart
> of streaming).

So it does suggest a leak. Probably somewhere on an error path,
e.g. its lost video sync.

     Andrew
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