Re: [tip:x86/mm] percpu: Introduce a read-mostly percpu API

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From: H. Peter Anvin

Subject: Re: [tip:x86/mm] percpu: Introduce a read-mostly percpu API

Date: Wednesday, October 20, 2010 - 7:53 pm

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:

quoted text>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.

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Messages in current thread:

[PATCH 1/2]percpu: introduce read mostly percpu API, Shaohua Li, (Tue Oct 19, 8:07 pm)

Re: [PATCH 1/2]percpu: introduce read mostly percpu API, Eric Dumazet, (Tue Oct 19, 10:18 pm)

Re: [PATCH 1/2]percpu: introduce read mostly percpu API, H. Peter Anvin, (Tue Oct 19, 11:00 pm)

Re: [PATCH 1/2]percpu: introduce read mostly percpu API, Andi Kleen, (Wed Oct 20, 12:35 am)

Re: [PATCH 1/2]percpu: introduce read mostly percpu API, Eric Dumazet, (Wed Oct 20, 12:53 am)

Re: [PATCH 1/2]percpu: introduce read mostly percpu API, H. Peter Anvin, (Wed Oct 20, 2:33 pm)

Re: [PATCH 1/2]percpu: introduce read mostly percpu API, H. Peter Anvin, (Wed Oct 20, 2:38 pm)

Re: [PATCH 1/2]percpu: introduce read mostly percpu API, H. Peter Anvin, (Wed Oct 20, 2:42 pm)

[tip:x86/mm] percpu: Introduce a read-mostly percpu API, tip-bot for Shaohua Li, (Wed Oct 20, 4:06 pm)

Re: [tip:x86/mm] percpu: Introduce a read-mostly percpu API, Shaohua Li, (Wed Oct 20, 6:38 pm)

Re: [tip:x86/mm] percpu: Introduce a read-mostly percpu API, H. Peter Anvin, (Wed Oct 20, 7:53 pm)

Re: [tip:x86/mm] percpu: Introduce a read-mostly percpu API, Eric Dumazet, (Wed Oct 20, 10:33 pm)

Re: [tip:x86/mm] percpu: Introduce a read-mostly percpu API, H. Peter Anvin, (Wed Oct 20, 10:54 pm)

Re: [tip:x86/mm] percpu: Introduce a read-mostly percpu API, Eric Dumazet, (Wed Oct 20, 11:07 pm)

Re: [tip:x86/mm] percpu: Introduce a read-mostly percpu API, H. Peter Anvin, (Wed Oct 20, 11:09 pm)

Re: [tip:x86/mm] percpu: Introduce a read-mostly percpu API, H. Peter Anvin, (Wed Oct 20, 11:10 pm)

Re: [tip:x86/mm] percpu: Introduce a read-mostly percpu API, Shaohua Li, (Wed Oct 20, 11:17 pm)

Re: [tip:x86/mm] percpu: Introduce a read-mostly percpu API, Eric Dumazet, (Wed Oct 20, 11:48 pm)

Re: [tip:x86/mm] percpu: Introduce a read-mostly percpu API, H. Peter Anvin, (Wed Oct 20, 11:54 pm)

[tip:x86/mm] x86-32, percpu: Correct the ordering of the p ..., tip-bot for H. Peter ..., (Thu Oct 21,