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

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Message-ID: <20090102160949.GF1180@elte.hu>
Date:	Fri, 2 Jan 2009 17:09:51 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Ravikiran G Thirumalai <kiran@...lex86.org>
Cc:	linux-kernel@...r.kernel.org, travis@....com
Subject: Re: [patch] x86: Fix incorrect __read_mostly on _boot_cpu_pda


* 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,

	Ingo
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