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SubjectRe: [PATCH v2 4/6] mm: Only IPI CPUs to drain local pages if they exist
On 10/23/2011 11:56 AM, Gilad Ben-Yossef wrote:
> Use a cpumask to track CPUs with per-cpu pages in any zone
> and only send an IPI requesting CPUs to drain these pages
> to the buddy allocator if they actually have pages.

> +/* Which CPUs have per cpu pages */
> +cpumask_var_t cpus_with_pcp;
> +static DEFINE_PER_CPU(unsigned long, total_cpu_pcp_count);

Does the flushing happen so frequently that it is worth keeping this
state on a per-cpu basis, or would it be better to check each CPU's
pcp info and assemble a cpumask at flush time like done in patch 5?



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