linux-ext4 - Re: ext4 memory leak?

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Message-ID: <20101207163820.GF24607@thunk.org>
Date:	Tue, 7 Dec 2010 11:38:20 -0500
From:	Ted Ts'o <tytso@....edu>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Rik van Riel <riel@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Mason <chris.mason@...cle.com>,
	Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.cz>,
	Jens Axboe <axboe@...nel.dk>, Mel Gorman <mel@....ul.ie>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Christoph Hellwig <hch@....de>, linux-mm <linux-mm@...ck.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: ext4 memory leak?

On Tue, Dec 07, 2010 at 11:21:20PM +0800, Wu Fengguang wrote:
> On Tue, Dec 07, 2010 at 10:33:51PM +0800, Wu Fengguang wrote:
> > > In a simple dd test on a 8p system with "mem=256M", I find the light
> > 
> > When increasing to 10 concurrent dd tasks, I managed to crash ext4..
> > (2 concurrent dd's are OK, with very good write performance.)

What was the dd command line?  Specifically, how big were the file
writes?  I haven't been able to replicate a leak.  I'll try on a small
system seeing if I can replicate an OOM kill, but I'm not seeing a
leak.  (i.e., after the dd if=/dev/zero of=/test/$i" jobs) are
finished, the memory utilization looks normal and I don't see any
obvious slab leaks.

       	      	       		    	- Ted
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