+ mm-vmstats-tlb-flush-counters.patch added to -mm tree

+ mm-vmstats-tlb-flush-counters.patch added to -mm tree

[akpm]

Subject: + mm-vmstats-tlb-flush-counters.patch added to -mm tree
To: dave@sr71.net,a.p.zijlstra@chello.nl,dave.hansen@linux.intel.com,hpa@zytor.com,mingo@elte.hu,tglx@linutronix.de
From: akpm@linux-foundation.org
Date: Thu, 18 Jul 2013 13:48:58 -0700


The patch titled
     Subject: mm: vmstats: tlb flush counters
has been added to the -mm tree.  Its filename is
     mm-vmstats-tlb-flush-counters.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/mm-vmstats-tlb-flush-counters.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/mm-vmstats-tlb-flush-counters.patch

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------------------------------------------------------
From: Dave Hansen <dave@sr71.net>
Subject: mm: vmstats: tlb flush counters

I was investigating some TLB flush scaling issues and realized that we do
not have any good methods for figuring out how many TLB flushes we are
doing.

It would be nice to be able to do these in generic code, but the
arch-independent calls don't explicitly specify whether we actually need
to do remote flushes or not.  In the end, we really need to know if we
actually _did_ global vs.  local invalidations, so that leaves us with few
options other than to muck with the counters from arch-specific code.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/x86/mm/tlb.c             |   18 ++++++++++++++----
 include/linux/vm_event_item.h |    5 +++++
 mm/vmstat.c                   |    5 +++++
 3 files changed, 24 insertions(+), 4 deletions(-)

diff -puN arch/x86/mm/tlb.c~mm-vmstats-tlb-flush-counters arch/x86/mm/tlb.c
--- a/arch/x86/mm/tlb.c~mm-vmstats-tlb-flush-counters
+++ a/arch/x86/mm/tlb.c
@@ -103,6 +103,7 @@ static void flush_tlb_func(void *info)
 	if (f->flush_mm != this_cpu_read(cpu_tlbstate.active_mm))
 		return;
 
+	count_vm_event(NR_TLB_REMOTE_FLUSH_RECEIVED);
 	if (this_cpu_read(cpu_tlbstate.state) == TLBSTATE_OK) {
 		if (f->flush_end == TLB_FLUSH_ALL)
 			local_flush_tlb();
@@ -130,6 +131,7 @@ void native_flush_tlb_others(const struc
 	info.flush_start = start;
 	info.flush_end = end;
 
+	count_vm_event(NR_TLB_REMOTE_FLUSH);
 	if (is_uv_system()) {
 		unsigned int cpu;
 
@@ -149,6 +151,7 @@ void flush_tlb_current_task(void)
 
 	preempt_disable();
 
+	count_vm_event(NR_TLB_LOCAL_FLUSH_ALL);
 	local_flush_tlb();
 	if (cpumask_any_but(mm_cpumask(mm), smp_processor_id()) < nr_cpu_ids)
 		flush_tlb_others(mm_cpumask(mm), mm, 0UL, TLB_FLUSH_ALL);
@@ -211,16 +214,19 @@ void flush_tlb_mm_range(struct mm_struct
 	act_entries = mm->total_vm > tlb_entries ? tlb_entries : mm->total_vm;
 
 	/* tlb_flushall_shift is on balance point, details in commit log */
-	if ((end - start) >> PAGE_SHIFT > act_entries >> tlb_flushall_shift)
+	if ((end - start) >> PAGE_SHIFT > act_entries >> tlb_flushall_shift) {
+		count_vm_event(NR_TLB_LOCAL_FLUSH_ALL);
 		local_flush_tlb();
-	else {
+	} 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)
+		for (addr = start; addr < end;	addr += PAGE_SIZE) {
+			count_vm_event(NR_TLB_LOCAL_FLUSH_ONE);
 			__flush_tlb_single(addr);
+		}
 
 		if (cpumask_any_but(mm_cpumask(mm),
 				smp_processor_id()) < nr_cpu_ids)
@@ -256,6 +262,7 @@ void flush_tlb_page(struct vm_area_struc
 
 static void do_flush_tlb_all(void *info)
 {
+	count_vm_event(NR_TLB_REMOTE_FLUSH_RECEIVED);
 	__flush_tlb_all();
 	if (this_cpu_read(cpu_tlbstate.state) == TLBSTATE_LAZY)
 		leave_mm(smp_processor_id());
@@ -263,6 +270,7 @@ static void do_flush_tlb_all(void *info)
 
 void flush_tlb_all(void)
 {
+	count_vm_event(NR_TLB_REMOTE_FLUSH);
 	on_each_cpu(do_flush_tlb_all, NULL, 1);
 }
 
@@ -272,8 +280,10 @@ static void do_kernel_range_flush(void *
 	unsigned long addr;
 
 	/* flush range by one by one 'invlpg' */
-	for (addr = f->flush_start; addr < f->flush_end; addr += PAGE_SIZE)
+	for (addr = f->flush_start; addr < f->flush_end; addr += PAGE_SIZE) {
+		count_vm_event(NR_TLB_LOCAL_FLUSH_ONE_KERNEL);
 		__flush_tlb_single(addr);
+	}
 }
 
 void flush_tlb_kernel_range(unsigned long start, unsigned long end)
diff -puN include/linux/vm_event_item.h~mm-vmstats-tlb-flush-counters include/linux/vm_event_item.h
--- a/include/linux/vm_event_item.h~mm-vmstats-tlb-flush-counters
+++ a/include/linux/vm_event_item.h
@@ -70,6 +70,11 @@ enum vm_event_item { PGPGIN, PGPGOUT, PS
 		THP_ZERO_PAGE_ALLOC,
 		THP_ZERO_PAGE_ALLOC_FAILED,
 #endif
+		NR_TLB_REMOTE_FLUSH,	/* cpu tried to flush others' tlbs */
+		NR_TLB_REMOTE_FLUSH_RECEIVED,/* cpu received ipi for flush */
+		NR_TLB_LOCAL_FLUSH_ALL,
+		NR_TLB_LOCAL_FLUSH_ONE,
+		NR_TLB_LOCAL_FLUSH_ONE_KERNEL,
 		NR_VM_EVENT_ITEMS
 };
 
diff -puN mm/vmstat.c~mm-vmstats-tlb-flush-counters mm/vmstat.c
--- a/mm/vmstat.c~mm-vmstats-tlb-flush-counters
+++ a/mm/vmstat.c
@@ -817,6 +817,11 @@ const char * const vmstat_text[] = {
 	"thp_zero_page_alloc",
 	"thp_zero_page_alloc_failed",
 #endif
+	"nr_tlb_remote_flush",
+	"nr_tlb_remote_flush_received",
+	"nr_tlb_local_flush_all",
+	"nr_tlb_local_flush_one",
+	"nr_tlb_local_flush_one_kernel",
 
 #endif /* CONFIG_VM_EVENTS_COUNTERS */
 };
_

Patches currently in -mm which might be from dave@sr71.net are

mm-vmstats-tlb-flush-counters.patch