diff options
| author | Dave Hansen <dave.hansen@linux.intel.com> | 2014-07-31 08:40:56 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2014-07-31 08:48:50 -0700 |
| commit | 9dfa6dee5355f200cf19528ca7c678ef4007cec5 (patch) | |
| tree | a42ed7ec7cc9e9bb3f27507b89c0fbd3a524d2ce | |
| parent | e9f4e0a9fe2723078b7a1a1169828dd46a7b2f9e (diff) | |
x86/mm: Fix missed global TLB flush stat
If we take the
if (end == TLB_FLUSH_ALL || vmflag & VM_HUGETLB) {
local_flush_tlb();
goto out;
}
path out of flush_tlb_mm_range(), we will have flushed the tlb,
but not incremented NR_TLB_LOCAL_FLUSH_ALL. This unifies the
way out of the function so that we always take a single path when
doing a full tlb flush.
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: http://lkml.kernel.org/r/20140731154056.FF763B76@viggo.jf.intel.com
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| -rw-r--r-- | arch/x86/mm/tlb.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c index dff6ddebc45f..ae584d09e8b0 100644 --- a/arch/x86/mm/tlb.c +++ b/arch/x86/mm/tlb.c @@ -164,8 +164,9 @@ unsigned long tlb_single_page_flush_ceiling = 1; void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, unsigned long end, unsigned long vmflag) { - int need_flush_others_all = 1; unsigned long addr; + /* do a global flush by default */ + unsigned long base_pages_to_flush = TLB_FLUSH_ALL; preempt_disable(); if (current->active_mm != mm) @@ -176,16 +177,14 @@ void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, goto out; } - if (end == TLB_FLUSH_ALL || vmflag & VM_HUGETLB) { - local_flush_tlb(); - goto out; - } + if ((end != TLB_FLUSH_ALL) && !(vmflag & VM_HUGETLB)) + base_pages_to_flush = (end - start) >> PAGE_SHIFT; - if ((end - start) > tlb_single_page_flush_ceiling * PAGE_SIZE) { + if (base_pages_to_flush > tlb_single_page_flush_ceiling) { + base_pages_to_flush = TLB_FLUSH_ALL; count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL); local_flush_tlb(); } else { - need_flush_others_all = 0; /* flush range by one by one 'invlpg' */ for (addr = start; addr < end; addr += PAGE_SIZE) { count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ONE); @@ -193,7 +192,7 @@ void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, } } out: - if (need_flush_others_all) { + if (base_pages_to_flush == TLB_FLUSH_ALL) { start = 0UL; end = TLB_FLUSH_ALL; } |