linux-kernel - [tip:x86/urgent] x86/mm: Clean up inconsistencies when flushing TLB ranges

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Message-ID: <tip-15aa368255f249df0b2af630c9487bb5471bd7da@git.kernel.org>
Date:	Sat, 25 Jan 2014 06:24:58 -0800
From:	tip-bot for Mel Gorman <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	torvalds@...ux-foundation.org, peterz@...radead.org,
	hughd@...gle.com, alex.shi@...aro.org, riel@...hat.com,
	akpm@...ux-foundation.org, mgorman@...e.de, tglx@...utronix.de,
	davidlohr@...com
Subject: [tip:x86/urgent] x86/mm:
  Clean up inconsistencies when flushing TLB ranges

Commit-ID:  15aa368255f249df0b2af630c9487bb5471bd7da
Gitweb:     http://git.kernel.org/tip/15aa368255f249df0b2af630c9487bb5471bd7da
Author:     Mel Gorman <mgorman@...e.de>
AuthorDate: Tue, 21 Jan 2014 14:33:18 -0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Sat, 25 Jan 2014 09:10:42 +0100

x86/mm: Clean up inconsistencies when flushing TLB ranges

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@...e.de>
Tested-by: Davidlohr Bueso <davidlohr@...com>
Reviewed-by: Alex Shi <alex.shi@...aro.org>
Reviewed-by: Rik van Riel <riel@...hat.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Hugh Dickins <hughd@...gle.com>
Link: http://lkml.kernel.org/n/tip-Iz5gcahrgskIldvukulzi0hh@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/mm/tlb.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index 05446c1..5176526 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -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);
--
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