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x86/mm: Clean up inconsistencies when flushing TLB ranges

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NR_TLB_LOCAL_FLUSH_ALL is not always accounted for correctly and
the comparison with total_vm is done before taking
tlb_flushall_shift into account.  Clean it up.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Tested-by: Davidlohr Bueso <davidlohr@hp.com>
Reviewed-by: Alex Shi <alex.shi@linaro.org>
Reviewed-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Hugh Dickins <hughd@google.com>
Link: http://lkml.kernel.org/n/tip-Iz5gcahrgskIldvukulzi0hh@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Mel Gorman 2014-01-21 14:33:18 -08:00 committed by Ingo Molnar
parent ec65993443
commit 15aa368255
1 changed files with 6 additions and 6 deletions
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12
arch/x86/mm/tlb.c
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@ -189,6 +189,7 @@ void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
{
unsigned long addr;
unsigned act_entries, tlb_entries = 0;
unsigned long nr_base_pages;
preempt_disable();
if (current->active_mm != mm)
@ -210,18 +211,17 @@ void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
tlb_entries = tlb_lli_4k[ENTRIES];
else
tlb_entries = tlb_lld_4k[ENTRIES];
/* Assume all of TLB entries was occupied by this task */
act_entries = mm->total_vm > tlb_entries ? tlb_entries : mm->total_vm;
act_entries = tlb_entries >> tlb_flushall_shift;
act_entries = mm->total_vm > act_entries ? act_entries : mm->total_vm;
nr_base_pages = (end - start) >> PAGE_SHIFT;
/* tlb_flushall_shift is on balance point, details in commit log */
if ((end - start) >> PAGE_SHIFT > act_entries >> tlb_flushall_shift) {
if (nr_base_pages > act_entries || has_large_page(mm, start, end)) {
count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
local_flush_tlb();
} else {
if (has_large_page(mm, start, end)) {
local_flush_tlb();
goto flush_all;
}
/* flush range by one by one 'invlpg' */
for (addr = start; addr < end; addr += PAGE_SIZE) {
count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ONE);