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Message-ID: <53a2d76e-2737-4e08-b408-2f939e2771e4@email.android.com>
Date: Wed, 20 Oct 2010 19:53:17 -0700
From: "H. Peter Anvin" <hpa@...or.com>
To: Shaohua Li <shaohua.li@...el.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"mingo@...hat.com" <mingo@...hat.com>,
"eric.dumazet@...il.com" <eric.dumazet@...il.com>,
"tglx@...utronix.de" <tglx@...utronix.de>,
"hpa@...ux.intel.com" <hpa@...ux.intel.com>
Subject: Re: [tip:x86/mm] percpu: Introduce a read-mostly percpu API
I know, but I can't do that immediately. It is an optimizatiin we can do for .38.
"Shaohua Li" <shaohua.li@...el.com> wrote:
>Hi hpa,
>On Thu, Oct 21, 2010 at 07:06:59AM +0800, tip-bot for Shaohua Li wrote:
>> [ hpa: moved it *after* the page-aligned section, for obvious
>> reasons. ]
>move it after page-aligned section can't guarantee to avoid cache false
>sharing.
>we need:
>. = ALIGN(CACHE_LINE_SIZE);
>*(.data..percpu..readmostly)
>. = ALIGN(CACHE_LINE_SIZE);
>To make sure before/after readmostly section doesn't share cache line
>with
>others. The headcache is some arch need L1_CACHE_SIZE and others need
>(1 << INTERNODE_CACHE_SHIFT). We need change all ARCHs to make this
>happen.
--
Sent from my mobile phone. Please pardon any lack of formatting.
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