linux-kernel - Re: [PATCH] vmalloc : optimization, cleanup, bugfixes

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Message-Id: <200610231130.26594.dada1@cosmosbay.com>
Date:	Mon, 23 Oct 2006 11:30:26 +0200
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Nick Piggin <nickpiggin@...oo.com.au>,
	Andrew Morton <akpm@...l.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vmalloc : optimization, cleanup, bugfixes

On Monday 23 October 2006 11:13, Nick Piggin wrote:
> Eric Dumazet wrote:
> > 3) Bugfixes in vmalloc_user() and vmalloc_32_user()
> > NULL returns from __vmalloc() and __find_vm_area() were not tested.
>
> Hmm, so they weren't. As far as testing the return of __find_vm_area,
> you can just turn that into a BUG_ON(!area), because at that point,
> we've established that the vmalloc succeeded.

OK :) 

[PATCH] vmalloc : optimization, cleanup, bugfixes

This patch does three things

1) reorder 'struct vm_struct' to speedup lookups on CPUS with small cache 
lines. The fields 'next,addr,size' should be now in the same cache line, to 
speedup lookups.

2) One minor cleanup in __get_vm_area_node()

3) Bugfixes in vmalloc_user() and vmalloc_32_user()
NULL returns from __vmalloc() and __find_vm_area() were not tested.


Signed-off-by: Eric Dumazet <dada1@...mosbay.com>

View attachment "vmalloc.patch" of type "text/plain" (1785 bytes)