Date: Tue, 14 Feb 2006 01:05:30 +0100
From: Willy Tarreau <willy@w.ods.org>
To: Yoss <bartek@milc.com.pl>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Memory leak in 2.4.33-pre1?
Message-ID: <20060214000529.GJ11380@w.ods.org>
References: <20060213214651.GA27844@milc.com.pl>
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Hello,

On Mon, Feb 13, 2006 at 10:46:51PM +0100, Yoss wrote:
> Hello.
> My server have lost about ~300MB of RAM. Details:
> 
> webcache:~# uname -a
> Linux webcache 2.4.33-pre1 #2 Wed Feb 8 18:26:44 CET 2006 i686 GNU/Linux
> 
> No other patches. Only basic elements needed to work in network
> enviroment.
> 	
> webcache:~# dmesg | grep MEM
> 127MB HIGHMEM available.
> 896MB LOWMEM available.
> 
> When I count memmory used by processes (column SIZE from ps or RES from
> top) there is about 650MB used. (There is only squid, named and basic
> system deamons running on that host). But:
> 
> webcache:~# free -m
>             total       used       free     shared  buffers    cached
> Mem:         1009        996         13          0       18        32
> -/+ buffers/cache:       945         64
> Swap:        1953          0       1952
> 
> 
> So there is missing about ~300MB.
> If anyone wants to have more detailed info feel free to ask.

You don't have to worry. Simply check /proc/slabinfo, you'll see plenty
of memory used by dentry_cache and inode_cache and that's expected. This
memory will be reclaimed when needed (for instance by calls to malloc()).

If you don't believe me, simply allocate 1 GB in a process, then free it.

Regards,
Willy

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