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| author | Mike Travis <travis@sgi.com> | 2009-01-10 21:58:10 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-01-11 19:13:09 +0100 |
| commit | 0e21990ae7ee11af94f44f240b06e520cf1505d4 (patch) | |
| tree | 759edecf00072c61f0640f317d736b1eccd53f19 /arch | |
| parent | 4595f9620cda8a1e973588e743cf5f8436dd20c6 (diff) | |
| download | linux-0e21990ae7ee11af94f44f240b06e520cf1505d4.tar.gz linux-0e21990ae7ee11af94f44f240b06e520cf1505d4.tar.bz2 linux-0e21990ae7ee11af94f44f240b06e520cf1505d4.zip | |
SGI UV cpumask: use static temp cpumask in flush_tlb
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/tlb_64.c | 21 |
1 files changed, 11 insertions, 10 deletions
diff --git a/arch/x86/kernel/tlb_64.c b/arch/x86/kernel/tlb_64.c index 38836aef51b4..7a3f9891302d 100644 --- a/arch/x86/kernel/tlb_64.c +++ b/arch/x86/kernel/tlb_64.c @@ -202,16 +202,17 @@ void native_flush_tlb_others(const struct cpumask *cpumask, struct mm_struct *mm, unsigned long va) { if (is_uv_system()) { - cpumask_var_t after_uv_flush; - - if (alloc_cpumask_var(&after_uv_flush, GFP_ATOMIC)) { - cpumask_andnot(after_uv_flush, - cpumask, cpumask_of(smp_processor_id())); - if (!uv_flush_tlb_others(after_uv_flush, mm, va)) - flush_tlb_others_ipi(after_uv_flush, mm, va); - free_cpumask_var(after_uv_flush); - return; - } + /* 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); + + cpumask_andnot(after_uv_flush, cpumask, + cpumask_of(smp_processor_id())); + if (!uv_flush_tlb_others(after_uv_flush, mm, va)) + flush_tlb_others_ipi(after_uv_flush, mm, va); + + put_cpu_var(flush_tlb_uv_cpumask); + return; } flush_tlb_others_ipi(cpumask, mm, va); } |