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From: Artem Bityutskiy <dedekind@infradead.org>
To: Alexey Korolev <akorolev@infradead.org>
Cc: linux-mtd@lists.infradead.org, dwmw2@infradead.org
Subject: Re: [PATCH][nandsim] FIX RAM wasting via kmalloc
Date: Wed, 22 Oct 2008 18:49:06 +0300	[thread overview]
Message-ID: <1224690546.4466.118.camel@sauron> (raw)
In-Reply-To: <alpine.LFD.1.10.0810221611550.30499@casper.infradead.org>

Hi Alexey,

thanks for the patch.

On Wed, 2008-10-22 at 16:33 +0100, Alexey Korolev wrote:
> Hi All,
> 
> Nandsim consumes ~2x more RAM than the density of simulated device. 
> It becomes critical if we need to simulate 256MB NAND and run stress tests 
> on it.
> 
> We investigated the reasons. nandsim allocates space for pages using kmalloc
> function. The size of LP nand page is 2112 bytes.
> kmalloc gets space from slab pools by chunks 2^n. So if we need to kmalloc
> 2112 bytes, 4096 bytes will be consumed by system.
> The best way to avoid this issue would be using kmem_cache allocations. AFAIK
> this mechanism specially designed to handle cases when arrays of allocations
> are used.

Acked-by: Artem Bityutskiy <dedekind@infradead.org>

-- 
Best regards,
Artem Bityutskiy (Битюцкий Артём)

  reply	other threads:[~2008-10-22 15:49 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-10-22 15:33 [PATCH][nandsim] FIX RAM wasting via kmalloc Alexey Korolev
2008-10-22 15:49 ` Artem Bityutskiy [this message]
2008-10-27  7:18 ` Artem Bityutskiy
2008-10-27 12:59   ` Alexey Korolev
2008-10-29  9:27     ` Artem Bityutskiy

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