linux-kernel - Re: [patch] x86: Fix incorrect __read_mostly on _boot_cpu

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Date:	Fri, 2 Jan 2009 10:55:24 -0800
From:	Ravikiran G Thirumalai <kiran@...lex86.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, travis@....com, stable@...nel.org,
	shai@...lex86.org
Subject: Re: [patch] x86: Fix incorrect __read_mostly on _boot_cpu_pda

On Fri, Jan 02, 2009 at 05:09:51PM +0100, Ingo Molnar wrote:
>
>* Ravikiran G Thirumalai <kiran@...lex86.org> wrote:
>
>> The pda rework (commit 3461b0af025251bbc6b3d56c821c6ac2de6f7209)
>> to remove static boot cpu pdas introduced a bug.  _boot_cpu_pda is the
>> actual pda used by the boot cpu and is definitely not "__read_mostly" and
>> ended up polluting the read mostly section with writes.  This bug caused
>> regression of about 8-10% on certain syscall intensive workloads.
>> 
>> Signed-off-by: Ravikiran Thirumalai <kiran@...lex86.org>
>
>applied to tip/x86/urgent, with a Cc: stable tag. Thanks,
>

Thanks!

Stable maintainers, please consider this for 2.6.27 stable as well
(in addition to 28).  (Attaching the tip/x86/urgent commit as reference to
the patch)

Thanks,
Kiran

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