From: Ingo Molnar <mingo@kernel.org>
To: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Cc: Paul Turner <pjt@google.com>,
Lee Schermerhorn <Lee.Schermerhorn@hp.com>,
Christoph Lameter <cl@linux.com>, Rik van Riel <riel@redhat.com>,
Mel Gorman <mgorman@suse.de>,
Andrew Morton <akpm@linux-foundation.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Thomas Gleixner <tglx@linutronix.de>,
Michel Lespinasse <walken@google.com>
Subject: [PATCH 19/31] x86/mm: Completely drop the TLB flush from ptep_set_access_flags()
Date: Tue, 13 Nov 2012 18:13:42 +0100 [thread overview]
Message-ID: <1352826834-11774-20-git-send-email-mingo@kernel.org> (raw)
In-Reply-To: <1352826834-11774-1-git-send-email-mingo@kernel.org>
From: Rik van Riel <riel@redhat.com>
Intel has an architectural guarantee that the TLB entry causing
a page fault gets invalidated automatically. This means
we should be able to drop the local TLB invalidation.
Because of the way other areas of the page fault code work,
chances are good that all x86 CPUs do this. However, if
someone somewhere has an x86 CPU that does not invalidate
the TLB entry causing a page fault, this one-liner should
be easy to revert - or a CPU model specific quirk could
be added to retain this optimization on most CPUs.
Signed-off-by: Rik van Riel <riel@redhat.com>
Acked-by: Linus Torvalds <torvalds@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michel Lespinasse <walken@google.com>
[ Applied changelog massage and moved this last in the series,
to create bisection distance. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/mm/pgtable.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index be3bb46..7353de3 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -317,7 +317,6 @@ int ptep_set_access_flags(struct vm_area_struct *vma,
if (changed && dirty) {
*ptep = entry;
pte_update_defer(vma->vm_mm, address, ptep);
- __flush_tlb_one(address);
}
return changed;
--
1.7.11.7
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next prev parent reply other threads:[~2012-11-13 17:15 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-13 17:13 [PATCH 00/31] Latest numa/core patches, v15 Ingo Molnar
2012-11-13 17:13 ` [PATCH 01/31] mm/generic: Only flush the local TLB in ptep_set_access_flags() Ingo Molnar
2012-11-13 17:13 ` [PATCH 02/31] x86/mm: Only do a local tlb flush " Ingo Molnar
2012-11-13 17:13 ` [PATCH 03/31] sched, numa, mm: Make find_busiest_queue() a method Ingo Molnar
2012-11-13 17:13 ` [PATCH 04/31] sched, numa, mm: Describe the NUMA scheduling problem formally Ingo Molnar
2012-11-13 17:13 ` [PATCH 05/31] sched, numa, mm, s390/thp: Implement pmd_pgprot() for s390 Ingo Molnar
2012-11-13 17:13 ` [PATCH 06/31] mm/thp: Preserve pgprot across huge page split Ingo Molnar
2012-11-13 17:13 ` [PATCH 07/31] x86/mm: Introduce pte_accessible() Ingo Molnar
2012-11-13 17:13 ` [PATCH 08/31] mm: Only flush the TLB when clearing an accessible pte Ingo Molnar
2012-11-13 17:13 ` [PATCH 09/31] sched, numa, mm, MIPS/thp: Add pmd_pgprot() implementation Ingo Molnar
2012-11-13 17:13 ` [PATCH 10/31] mm/pgprot: Move the pgprot_modify() fallback definition to mm.h Ingo Molnar
2012-11-13 17:13 ` [PATCH 11/31] mm/mpol: Make MPOL_LOCAL a real policy Ingo Molnar
2012-11-13 17:13 ` [PATCH 12/31] mm/mpol: Add MPOL_MF_NOOP Ingo Molnar
2012-11-13 17:13 ` [PATCH 13/31] mm/mpol: Check for misplaced page Ingo Molnar
2012-11-13 17:13 ` [PATCH 14/31] mm/mpol: Create special PROT_NONE infrastructure Ingo Molnar
2012-11-13 17:13 ` [PATCH 15/31] mm/mpol: Add MPOL_MF_LAZY Ingo Molnar
2012-11-13 17:13 ` [PATCH 16/31] numa, mm: Support NUMA hinting page faults from gup/gup_fast Ingo Molnar
2012-11-13 17:13 ` [PATCH 17/31] mm/migrate: Introduce migrate_misplaced_page() Ingo Molnar
2012-11-13 17:13 ` [PATCH 18/31] mm/mpol: Use special PROT_NONE to migrate pages Ingo Molnar
2012-11-13 17:13 ` Ingo Molnar [this message]
2012-11-13 17:13 ` [PATCH 20/31] sched, numa, mm: Introduce sched_feat_numa() Ingo Molnar
2012-11-13 17:13 ` [PATCH 21/31] sched, numa, mm: Implement THP migration Ingo Molnar
2012-11-13 18:48 ` Johannes Weiner
2012-11-14 2:23 ` Hugh Dickins
2012-11-14 2:27 ` [PATCH 1/2] sched, numa, mm: Add memcg support to do_huge_pmd_numa_page() Hugh Dickins
2012-11-14 2:29 ` [PATCH 2/2] sched, numa, mm: Fixes and cleanups in do_huge_pmd_numa_page() Hugh Dickins
2012-11-14 4:28 ` [PATCH 21/31] sched, numa, mm: Implement THP migration Andrew Morton
2012-11-13 17:13 ` [PATCH 22/31] sched, numa, mm: Add last_cpu to page flags Ingo Molnar
2012-11-13 17:13 ` [PATCH 23/31] sched, numa, mm, arch: Add variable locality exception Ingo Molnar
2012-11-13 17:13 ` [PATCH 24/31] sched, numa, mm: Add credits for NUMA placement Ingo Molnar
2012-11-13 17:13 ` [PATCH 25/31] sched, mm, x86: Add the ARCH_SUPPORTS_NUMA_BALANCING flag Ingo Molnar
2012-11-13 17:13 ` [PATCH 26/31] sched, numa, mm: Add the scanning page fault machinery Ingo Molnar
2012-11-13 17:13 ` [PATCH 27/31] sched, numa, mm: Add adaptive NUMA affinity support Ingo Molnar
2012-11-13 17:13 ` [PATCH 28/31] sched, numa, mm: Implement constant, per task Working Set Sampling (WSS) rate Ingo Molnar
2012-11-13 17:13 ` [PATCH 29/31] sched, numa, mm: Count WS scanning against present PTEs, not virtual memory ranges Ingo Molnar
2012-11-13 17:13 ` [PATCH 30/31] sched, numa, mm: Implement slow start for working set sampling Ingo Molnar
2012-11-13 17:13 ` [PATCH 31/31] mm: Allow the migration of shared pages Ingo Molnar
2012-11-13 17:54 ` [PATCH 00/31] Latest numa/core patches, v15 Mel Gorman
2012-11-14 7:52 ` Ingo Molnar
2012-11-14 11:36 ` Mel Gorman
2012-11-14 12:03 ` Mel Gorman
2012-11-17 8:45 ` Alex Shi
2012-11-18 19:32 ` Linus Torvalds
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