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SubjectRe: [v7 0/8] Reduce cross CPU IPI interference
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On Sun, 2012-02-05 at 13:46 +0200, Gilad Ben-Yossef wrote:
> > /*
> > * Cause all memory mappings to be populated in the page table.
> > * Specifying this when entering dataplane mode ensures that no future
> > * page fault events will occur to cause interrupts into the Linux
> > * kernel, as long as no new mappings are installed by mmap(), etc.
> > * Note that since the hardware TLB is of finite size, there will
> > * still be the potential for TLB misses that the hypervisor handles,
> > * either via its software TLB cache (fast path) or by walking the
> > * kernel page tables (slow path), so touching large amounts of memory
> > * will still incur hypervisor interrupt overhead.
> > */
> > #define DP_POPULATE 0x8
>
> hmm... I've probably missed something, but doesn't this replicate
> mlockall (MCL_CURRENT|MCL_FUTURE) ?

Never use mlockall() its a sign you're doing it wrong, also his comment
seems to imply MCL_FUTURE isn't required.



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