From: Brian Gerst <bgerst@quark.didntduck.org>
To: Manfred Spraul <manfred@colorfullife.com>
Cc: Anton Blanchard <anton@samba.org>,
Brian Gerst <bgerst@didntduck.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] slab.c cleanup
Date: Sun, 23 Mar 2003 16:07:37 -0500 [thread overview]
Message-ID: <3E7E2219.5090501@quark.didntduck.org> (raw)
In-Reply-To: <3E7E204C.2040700@colorfullife.com>
Manfred Spraul wrote:
> Anton wrote:
>
>>> - Don't create caches that are not multiples of L1_CACHE_BYTES.
>>
>>
>> Nice idea, I often see the list walk (of the cache sizes) in kmalloc
>> in kernel
>> profiles. eg a bunch of kmalloc(2k) for network drivers.
>>
>> Since we have a 128byte cacheline on ppc64 this patch should reduce that.
>>
>>
> No, the patch is a bad thing: It means that everyone who does
> kmalloc(32,) now allocates 128 bytes, i.e. 3/4 wasted. IMHO not acceptable.
Perhaps, but it currently is already allocating 128 bytes for smaller
caches, because the cache is created with SLAB_HWCACHE_ALIGN. So we
ended up with redundantly sized caches.
--
Brian Gerst
next prev parent reply other threads:[~2003-03-23 20:56 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-23 20:59 Manfred Spraul
2003-03-23 21:07 ` Brian Gerst [this message]
2003-03-23 21:20 ` Manfred Spraul
2003-03-23 21:51 ` Brian Gerst
[not found] <20030323211010$1215@gated-at.bofh.it>
[not found] ` <20030323211014$2f0c@gated-at.bofh.it>
2003-03-23 21:24 ` Arnd Bergmann
[not found] <20030323191010$7678@gated-at.bofh.it>
2003-03-23 21:11 ` Arnd Bergmann
-- strict thread matches above, loose matches on Subject: below --
2003-03-23 18:58 Brian Gerst
2003-03-23 19:12 ` Anton Blanchard
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