From: "H. Peter Anvin" <hpa@zytor.com>
To: Shaohua Li <shaohua.li@intel.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"mingo@redhat.com" <mingo@redhat.com>,
"eric.dumazet@gmail.com" <eric.dumazet@gmail.com>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"hpa@linux.intel.com" <hpa@linux.intel.com>
Subject: Re: [tip:x86/mm] percpu: Introduce a read-mostly percpu API
Date: Wed, 20 Oct 2010 19:53:17 -0700 [thread overview]
Message-ID: <53a2d76e-2737-4e08-b408-2f939e2771e4@email.android.com> (raw)
In-Reply-To: <20101021013833.GA21863@sli10-conroe.sh.intel.com>
I know, but I can't do that immediately. It is an optimizatiin we can do for .38.
"Shaohua Li" <shaohua.li@intel.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.
next prev parent reply other threads:[~2010-10-21 2:53 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-20 3:07 [PATCH 1/2]percpu: introduce read mostly " Shaohua Li
2010-10-20 5:18 ` Eric Dumazet
2010-10-20 6:00 ` H. Peter Anvin
2010-10-20 7:35 ` Andi Kleen
2010-10-20 7:53 ` Eric Dumazet
2010-10-20 21:38 ` H. Peter Anvin
2010-10-20 21:42 ` H. Peter Anvin
2010-10-20 21:33 ` H. Peter Anvin
2010-10-20 23:06 ` [tip:x86/mm] percpu: Introduce a read-mostly " tip-bot for Shaohua Li
2010-10-21 1:38 ` Shaohua Li
2010-10-21 2:53 ` H. Peter Anvin [this message]
2010-10-21 5:33 ` Eric Dumazet
2010-10-21 5:54 ` H. Peter Anvin
2010-10-21 6:07 ` Eric Dumazet
2010-10-21 6:09 ` H. Peter Anvin
2010-10-21 6:17 ` Shaohua Li
2010-10-21 6:48 ` Eric Dumazet
2010-10-21 6:54 ` H. Peter Anvin
2010-10-21 6:10 ` H. Peter Anvin
2010-10-21 7:40 ` [tip:x86/mm] x86-32, percpu: Correct the ordering of the percpu readmostly section tip-bot for H. Peter Anvin
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