From: Eric Dumazet <dada1@cosmosbay.com>
To: Benjamin LaHaise <bcrl@kvack.org>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] i386: instead of poisoning .init zone, change protection bits to force a fault
Date: Sun, 29 Jan 2006 21:28:33 +0100 [thread overview]
Message-ID: <43DD2571.4020805@cosmosbay.com> (raw)
In-Reply-To: <20060129200504.GD28400@kvack.org>
Benjamin LaHaise a écrit :
> On Sun, Jan 29, 2006 at 09:04:44PM +0100, Eric Dumazet wrote:
>> Chasing some invalid accesses to .init zone, I found that free_init_pages()
>> was properly freeing the pages but virtual was still usable.
>
> This change will break the large table entries up, resulting in more TLB
> pressure and reducing performance, and so should only be activated as a
> debug option.
Hum... yet another CONFIG option ?
Could we 'just' move rodata (because of CONFIG_DEBUG_RODATA) and .init section
in their own 2MB/4MB page, playing with vmlinux.lds.S ?
It would be possible to have a full hugepage readonly for rodata, and a full
NOPROT for .init ?
Eric
next prev parent reply other threads:[~2006-01-29 20:28 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-29 6:26 [PATCH] i386: Add a temporary to make put_user more type safe Eric W. Biederman
2006-01-29 6:39 ` Andrew Morton
2006-01-29 6:49 ` Eric W. Biederman
2006-01-29 7:51 ` Andrew Morton
[not found] ` <200601291620.28291.ioe-lkml@rameria.de>
2006-01-29 19:33 ` Andrew Morton
2006-01-29 20:04 ` [PATCH] i386: instead of poisoning .init zone, change protection bits to force a fault Eric Dumazet
2006-01-29 20:05 ` Benjamin LaHaise
2006-01-29 20:28 ` Eric Dumazet [this message]
2006-01-29 20:56 ` [PATCH, V2] " Eric Dumazet
2006-01-30 9:03 ` Questions about alloc_large_system_hash() and TLB entries Eric Dumazet
2006-01-30 9:22 ` David S. Miller
2006-01-30 10:22 ` Eric Dumazet
2006-02-04 22:41 ` [PATCH, V2] i386: instead of poisoning .init zone, change protection bits to force a fault Andrew Morton
2006-02-05 17:03 ` Eric Dumazet
2006-02-05 19:42 ` Andrew Morton
2006-02-06 8:53 ` Eric Dumazet
2006-02-06 9:02 ` Eric Dumazet
2006-02-06 9:28 ` Andrew Morton
2006-02-06 10:07 ` Eric Dumazet
2006-02-06 10:16 ` Andrew Morton
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