From: "David S. Miller" <davem@redhat.com>
To: Andrew Morton <akpm@digeo.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>,
dipankar@in.ibm.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] kmalloc_percpu
Date: 05 May 2003 19:11:59 -0700 [thread overview]
Message-ID: <1052187119.983.5.camel@rth.ninka.net> (raw)
In-Reply-To: <20030505185248.3c3a478f.akpm@digeo.com>
On Mon, 2003-05-05 at 18:52, Andrew Morton wrote:
> Rusty Russell <rusty@rustcorp.com.au> wrote:
> > OK. It has a size restriction: PERCPU_POOL_SIZE is the maximum total
> > kmalloc_percpu + static DECLARE_PER_CPU you'll get, ever. This is the
> > main downside. It's allocated at boot.
>
> And is subject to fragmentation.
>
> Is it not possible to go allocate another N * PERCPU_POOL_SIZE from
> slab if it runs out?
No, then you go back to things requireing multiple levels of
dereferencing. It's hard to realloc() because you have to
freeze the whole kernel to do that properly, and that is not
simple at all.
I think the fixed size pool is perfectly reasonable.
--
David S. Miller <davem@redhat.com>
next prev parent reply other threads:[~2003-05-06 2:45 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-05 8:08 Rusty Russell
2003-05-05 8:47 ` Andrew Morton
2003-05-06 0:47 ` Rusty Russell
2003-05-06 1:52 ` Andrew Morton
2003-05-06 2:11 ` David S. Miller [this message]
2003-05-06 4:08 ` Rusty Russell
2003-05-06 3:40 ` David S. Miller
2003-05-06 5:02 ` Andrew Morton
2003-05-06 4:16 ` David S. Miller
2003-05-06 5:48 ` Andrew Morton
2003-05-06 5:35 ` David S. Miller
2003-05-06 6:55 ` Andrew Morton
2003-05-06 5:57 ` David S. Miller
2003-05-06 7:22 ` Andrew Morton
2003-05-06 6:15 ` David S. Miller
2003-05-06 7:34 ` Andrew Morton
2003-05-06 8:42 ` William Lee Irwin III
2003-05-06 14:38 ` Martin J. Bligh
2003-05-06 7:20 ` Dipankar Sarma
2003-05-06 8:28 ` Rusty Russell
2003-05-06 8:47 ` Andrew Morton
2003-05-07 1:57 ` Rusty Russell
2003-05-07 2:41 ` William Lee Irwin III
2003-05-07 4:03 ` Paul Mackerras
2003-05-07 4:22 ` William Lee Irwin III
2003-05-07 4:56 ` Paul Mackerras
2003-05-07 5:19 ` William Lee Irwin III
2003-05-07 4:10 ` Martin J. Bligh
2003-05-07 12:13 ` William Lee Irwin III
2003-05-07 4:15 ` Rusty Russell
2003-05-07 5:37 ` Andrew Morton
2003-05-08 0:53 ` Rusty Russell
2003-05-06 14:41 ` Martin J. Bligh
2003-05-06 6:42 ` Andrew Morton
2003-05-06 5:39 ` David S. Miller
2003-05-06 6:57 ` Andrew Morton
2003-05-06 7:25 ` Jens Axboe
2003-05-06 10:41 ` Ingo Oeser
2003-05-06 16:05 ` Bryan O'Sullivan
2003-05-06 8:06 ` Rusty Russell
2003-05-06 5:03 ` Dipankar Sarma
2003-05-06 4:28 ` Andrew Morton
2003-05-06 3:37 ` David S. Miller
2003-05-06 4:11 ` Rusty Russell
2003-05-06 5:07 ` Ravikiran G Thirumalai
2003-05-06 8:03 ` Rusty Russell
2003-05-06 9:23 ` David S. Miller
2003-05-06 9:34 ` Ravikiran G Thirumalai
2003-05-06 9:38 ` Dipankar Sarma
2003-05-07 2:14 ` Rusty Russell
2003-05-07 5:51 ` Ravikiran G Thirumalai
2003-05-07 6:16 ` Rusty Russell
2003-05-08 7:42 ` Ravikiran G Thirumalai
2003-05-08 7:47 ` Rusty Russell
-- strict thread matches above, loose matches on Subject: below --
2002-10-31 16:06 [patch] kmalloc_percpu Ravikiran G Thirumalai
2002-11-01 8:33 ` Rusty Russell
2002-11-05 16:00 ` Dipankar Sarma
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