From: Alex Shi <alex.shi@intel.com>
To: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com,
arnd@arndb.de, rostedt@goodmis.org, fweisbec@gmail.com
Cc: jeremy@goop.org, riel@redhat.com, luto@mit.edu,
alex.shi@intel.com, avi@redhat.com, len.brown@intel.com,
dhowells@redhat.com, fenghua.yu@intel.com,
borislav.petkov@amd.com, yinghai@kernel.org, ak@linux.intel.com,
cpw@sgi.com, steiner@sgi.com, akpm@linux-foundation.org,
penberg@kernel.org, hughd@google.com, rientjes@google.com,
kosaki.motohiro@jp.fujitsu.com, n-horiguchi@ah.jp.nec.com,
tj@kernel.org, oleg@redhat.com, axboe@kernel.dk,
jmorris@namei.org, a.p.zijlstra@chello.nl,
kamezawa.hiroyu@jp.fujitsu.com, viro@zeniv.linux.org.uk,
linux-kernel@vger.kernel.org, yongjie.ren@intel.com
Subject: [PATCH v5 4/7] x86/tlb: fall back to flush all when meet a THP large page
Date: Tue, 15 May 2012 16:55:35 +0800 [thread overview]
Message-ID: <1337072138-8323-5-git-send-email-alex.shi@intel.com> (raw)
In-Reply-To: <1337072138-8323-1-git-send-email-alex.shi@intel.com>
We don't need to flush large pages by PAGE_SIZE step, that just waste
time. and actually, large page don't need 'invlpg' optimizing according
to our macro benchmark. So, just flush whole TLB is enough for them.
The following result is tested on a 2CPU * 4cores * 2HT NHM EP machine,
with THP 'always' setting.
Multi-thread testing, '-t' paramter is thread number:
without this patch with this patch
./mprotect -t 1 14ns 13ns
./mprotect -t 2 13ns 13ns
./mprotect -t 4 12ns 11ns
./mprotect -t 8 14ns 10ns
./mprotect -t 16 28ns 28ns
./mprotect -t 32 54ns 52ns
./mprotect -t 128 200ns 200ns
Signed-off-by: Alex Shi <alex.shi@intel.com>
---
arch/x86/mm/tlb.c | 34 ++++++++++++++++++++++++++++++++++
1 files changed, 34 insertions(+), 0 deletions(-)
diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index 7d92079..22e5bb1 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -316,12 +316,42 @@ void flush_tlb_mm(struct mm_struct *mm)
#define FLUSHALL_BAR 16
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+static inline int has_large_page(struct mm_struct *mm,
+ unsigned long start, unsigned long end)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ unsigned long addr = ALIGN(start, HPAGE_SIZE);
+ for (; addr < end; addr += HPAGE_SIZE) {
+ pgd = pgd_offset(mm, addr);
+ if (likely(!pgd_none(*pgd))) {
+ pud = pud_offset(pgd, addr);
+ if (likely(!pud_none(*pud))) {
+ pmd = pmd_offset(pud, addr);
+ if (likely(!pmd_none(*pmd)))
+ if (pmd_large(*pmd))
+ return 1;
+ }
+ }
+ }
+ return 0;
+}
+#else
+static inline int has_large_page(struct mm_struct *mm,
+ unsigned long start, unsigned long end)
+{
+ return 0;
+}
+#endif
void flush_tlb_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
struct mm_struct *mm;
if (!cpu_has_invlpg || vma->vm_flags & VM_HUGETLB) {
+flush_all:
flush_tlb_mm(vma->vm_mm);
return;
}
@@ -344,6 +374,10 @@ void flush_tlb_range(struct vm_area_struct *vma,
if ((end - start)/PAGE_SIZE > act_entries/FLUSHALL_BAR)
local_flush_tlb();
else {
+ if (has_large_page(mm, start, end)) {
+ preempt_enable();
+ goto flush_all;
+ }
for (addr = start; addr <= end;
addr += PAGE_SIZE)
__flush_tlb_single(addr);
--
1.7.5.4
next prev parent reply other threads:[~2012-05-15 8:57 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-15 8:55 [PATCH v5 0/7] tlb flush optimization for x86 Alex Shi
2012-05-15 8:55 ` [PATCH v5 1/7] x86/tlb: unify TLB_FLUSH_ALL definition Alex Shi
2012-05-15 8:55 ` [PATCH v5 2/7] x86/tlb_info: get last level TLB entry number of CPU Alex Shi
2012-05-15 8:55 ` [PATCH v5 3/7] x86/flush_tlb: try flush_tlb_single one by one in flush_tlb_range Alex Shi
2012-05-15 8:55 ` Alex Shi [this message]
2012-05-15 8:55 ` [PATCH v5 5/7] x86/tlb: add tlb_flushall_shift for specific CPU Alex Shi
2012-05-16 6:49 ` Alex Shi
2012-05-16 17:55 ` H. Peter Anvin
2012-05-17 1:46 ` Alex Shi
2012-05-15 8:55 ` [PATCH v5 6/7] x86/tlb: optimizing flush_tlb_mm Alex Shi
2012-05-15 9:11 ` Peter Zijlstra
2012-05-15 9:15 ` Nick Piggin
2012-05-15 9:17 ` Nick Piggin
2012-05-15 12:58 ` Luming Yu
2012-05-15 13:06 ` Peter Zijlstra
2012-05-15 13:27 ` Luming Yu
2012-05-15 13:28 ` Alex Shi
2012-05-15 13:33 ` Alex Shi
2012-05-15 13:39 ` Steven Rostedt
2012-05-15 14:04 ` Borislav Petkov
2012-05-15 13:08 ` Luming Yu
2012-05-15 14:07 ` Alex Shi
2012-05-15 9:18 ` Peter Zijlstra
2012-05-15 9:52 ` Nick Piggin
2012-05-15 10:00 ` Peter Zijlstra
2012-05-15 10:06 ` Nick Piggin
2012-05-15 10:13 ` Peter Zijlstra
2012-05-15 14:04 ` Alex Shi
2012-05-15 13:24 ` Alex Shi
2012-05-15 14:36 ` Peter Zijlstra
2012-05-15 14:57 ` Peter Zijlstra
2012-05-15 15:01 ` Alex Shi
2012-05-16 6:46 ` Alex Shi
2012-05-16 6:46 ` Alex Shi
2012-05-16 8:00 ` Peter Zijlstra
2012-05-16 8:04 ` Peter Zijlstra
2012-05-16 8:53 ` Alex Shi
2012-05-16 8:58 ` Peter Zijlstra
2012-05-16 10:58 ` Alex Shi
2012-05-16 11:04 ` Peter Zijlstra
2012-05-16 12:57 ` Alex Shi
2012-05-16 13:34 ` Alex Shi
2012-05-16 13:34 ` Alex Shi
2012-05-16 21:09 ` Peter Zijlstra
2012-05-17 0:43 ` Alex Shi
2012-05-17 2:07 ` Steven Rostedt
2012-05-17 8:04 ` Alex Shi
2012-05-17 2:14 ` Paul Mundt
2012-05-16 13:44 ` Alex Shi
2012-05-15 8:55 ` [PATCH v5 7/7] x86/tlb: add tlb_flushall_shift knob into debugfs Alex Shi
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