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

[H. Peter Anvin]

I know, but I can't do that immediately.  It is an optimizatiin we can do for .38.

"Shaohua Li" <shaohua.li@xxxxxxxxx> 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.

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