From: Ingo Molnar <mingo@elte.hu>
To: Ravikiran G Thirumalai <kiran@scalex86.org>
Cc: linux-kernel@vger.kernel.org, travis@sgi.com
Subject: Re: [patch] x86: Fix incorrect __read_mostly on _boot_cpu_pda
Date: Fri, 2 Jan 2009 17:09:51 +0100 [thread overview]
Message-ID: <20090102160949.GF1180@elte.hu> (raw)
In-Reply-To: <20081231214446.GA6856@localdomain>
* Ravikiran G Thirumalai <kiran@scalex86.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@scalex86.org>
applied to tip/x86/urgent, with a Cc: stable tag. Thanks,
Ingo
next prev parent reply other threads:[~2009-01-02 16:10 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-31 21:44 [patch] x86: Fix incorrect __read_mostly on _boot_cpu_pda Ravikiran G Thirumalai
2008-12-31 22:18 ` Mike Travis
2009-01-02 16:09 ` Ingo Molnar [this message]
2009-01-02 18:55 ` Ravikiran G Thirumalai
2009-01-02 19:20 ` Ingo Molnar
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