Messages in this thread Patch in this message | | | Subject | [PATCH] less tlb flush in unmap_vmas | From | Shaohua Li <> | Date | Wed, 22 Mar 2006 10:38:08 +0800 |
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In unmaping region, if current task doesn't need reschedule, don't do a tlb_finish_mmu. This can reduce some tlb flushes.
In the lmbench tests, this patch gives 2.1% improvement on exec proc item and 4.2% on sh proc item.
Signed-off-by: Shaohua Li <shaohua.li@intel.com> ---
linux-2.6.16-rc5-root/mm/memory.c | 7 +++---- 1 files changed, 3 insertions(+), 4 deletions(-)
diff -puN mm/memory.c~less_flush mm/memory.c --- linux-2.6.16-rc5/mm/memory.c~less_flush 2006-03-21 07:22:47.000000000 +0800 +++ linux-2.6.16-rc5-root/mm/memory.c 2006-03-21 07:26:51.000000000 +0800 @@ -837,19 +837,18 @@ unsigned long unmap_vmas(struct mmu_gath break; } - tlb_finish_mmu(*tlbp, tlb_start, start); - if (need_resched() || (i_mmap_lock && need_lockbreak(i_mmap_lock))) { + tlb_finish_mmu(*tlbp, tlb_start, start); if (i_mmap_lock) { *tlbp = NULL; goto out; } cond_resched(); + tlb_start_valid = 0; + *tlbp = tlb_gather_mmu(vma->vm_mm, fullmm); } - *tlbp = tlb_gather_mmu(vma->vm_mm, fullmm); - tlb_start_valid = 0; zap_work = ZAP_BLOCK_SIZE; } } _
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