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SGI UV cpumask: use static temp cpumask in flush_tlb

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Impact: Improve tlb flush performance for UV

Calling alloc_cpumask_var a zillion times a second does affect
performance.  Replace with static cpumask.

Note: when CONFIG_X86_UV is defined, this extra PER_CPU memory
will be optimized out for non-UV configs as is_uv_system() will
then return a constant 0.

Signed-off-by: Mike Travis <travis@sgi.com>
This commit is contained in:
Mike Travis 2009-01-10 21:58:10 -08:00 committed by Ingo Molnar
parent 4595f9620c
commit 0e21990ae7
1 changed files with 10 additions and 9 deletions
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19
arch/x86/kernel/tlb_64.c
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@ -202,16 +202,17 @@ void native_flush_tlb_others(const struct cpumask *cpumask,
struct mm_struct *mm, unsigned long va) struct mm_struct *mm, unsigned long va)
{ {
if (is_uv_system()) { if (is_uv_system()) {
cpumask_var_t after_uv_flush; /* FIXME: could be an percpu_alloc'd thing */
static DEFINE_PER_CPU(cpumask_t, flush_tlb_mask);
struct cpumask *after_uv_flush = &get_cpu_var(flush_tlb_mask);
if (alloc_cpumask_var(&after_uv_flush, GFP_ATOMIC)) { cpumask_andnot(after_uv_flush, cpumask,
cpumask_andnot(after_uv_flush, cpumask_of(smp_processor_id()));
cpumask, cpumask_of(smp_processor_id())); if (!uv_flush_tlb_others(after_uv_flush, mm, va))
if (!uv_flush_tlb_others(after_uv_flush, mm, va)) flush_tlb_others_ipi(after_uv_flush, mm, va);
flush_tlb_others_ipi(after_uv_flush, mm, va);
free_cpumask_var(after_uv_flush); put_cpu_var(flush_tlb_uv_cpumask);
return; return;
}
} }
flush_tlb_others_ipi(cpumask, mm, va); flush_tlb_others_ipi(cpumask, mm, va);
} }