From: Eric Dumazet <dada1@cosmosbay.com>
To: Andi Kleen <ak@suse.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Shrinks sizeof(files_struct) and better layout
Date: Wed, 04 Jan 2006 12:19:19 +0100 [thread overview]
Message-ID: <43BBAF37.3060108@cosmosbay.com> (raw)
In-Reply-To: <200601041215.36627.ak@suse.de>
Andi Kleen a écrit :
> On Wednesday 04 January 2006 12:13, Eric Dumazet wrote:
>> Andi Kleen a écrit :
>>> Eric Dumazet <dada1@cosmosbay.com> writes:
>>>> 1) Reduces the size of (struct fdtable) to exactly 64 bytes on 32bits
>>>> platforms, lowering kmalloc() allocated space by 50%.
>>> It should be probably a kmem_cache_alloc() instead of a kmalloc
>>> in the first place anyways. This would reduce fragmentation.
>> Well in theory yes, if you really expect thousand of tasks running...
>> But for most machines, number of concurrent tasks is < 200, and using a
>> special cache for this is not a win.
>
> It is because it avoids fragmentation because objects with similar livetimes
> are clustered together. In general caches are a win
> if the data is nearly a page or more.
I dont undertand your last sentence. Do you mean 'if the object size is near
PAGE_SIZE' ?
Eric
next prev parent reply other threads:[~2006-01-04 11:19 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20051108185349.6e86cec3.akpm@osdl.org>
[not found] ` <437226B1.4040901@cosmosbay.com>
[not found] ` <20051109220742.067c5f3a.akpm@osdl.org>
[not found] ` <4373698F.9010608@cosmosbay.com>
2006-01-04 0:06 ` [PATCH] Shrinks sizeof(files_struct) and better layout Eric Dumazet
2006-01-04 9:11 ` Jan Engelhardt
2006-01-04 10:12 ` Eric Dumazet
2006-01-04 10:28 ` Folkert van Heusden
2006-01-04 10:45 ` Andi Kleen
2006-01-04 11:13 ` Eric Dumazet
2006-01-04 11:15 ` Andi Kleen
2006-01-04 11:19 ` Eric Dumazet [this message]
2006-01-04 11:22 ` Andi Kleen
2006-01-04 11:41 ` Eric Dumazet
2006-01-04 11:58 ` Andi Kleen
2006-01-06 3:01 ` David Lang
2006-01-06 6:35 ` Eric Dumazet
2006-01-06 7:26 ` David Lang
2006-01-06 7:37 ` Eric Dumazet
2006-01-06 8:28 ` David Lang
2006-01-04 11:45 ` Andrew Morton
2006-01-04 13:14 ` Eric Dumazet
2006-01-04 23:24 ` [2.6 patch] Define BITS_PER_BYTE Adrian Bunk
2006-01-05 7:03 ` Jan Engelhardt
2006-01-05 15:18 ` Bryan O'Sullivan
2006-01-05 19:19 ` H. Peter Anvin
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