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authorDave Hansen <dave@sr71.net>2013-09-11 14:20:24 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-09-11 15:57:09 -0700
commit6df46865ff8715932e7d42e52cac17e8461758cb (patch)
tree7c7e1d43b22a2bec2d4a6fce95ddc3cbd481aa1e
parent9824cf9753ecbe8f5b47aa9b2f218207defea211 (diff)
mm: vmstats: track TLB flush stats on UP too
The previous patch doing vmstats for TLB flushes ("mm: vmstats: tlb flush counters") effectively missed UP since arch/x86/mm/tlb.c is only compiled for SMP. UP systems do not do remote TLB flushes, so compile those counters out on UP. arch/x86/kernel/cpu/mtrr/generic.c calls __flush_tlb() directly. This is probably an optimization since both the mtrr code and __flush_tlb() write cr4. It would probably be safe to make that a flush_tlb_all() (and then get these statistics), but the mtrr code is ancient and I'm hesitant to touch it other than to just stick in the counters. [akpm@linux-foundation.org: tweak comments] 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> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/x86/include/asm/tlbflush.h37
-rw-r--r--arch/x86/kernel/cpu/mtrr/generic.c2
-rw-r--r--arch/x86/mm/tlb.c4
-rw-r--r--include/linux/vm_event_item.h3
-rw-r--r--mm/vmstat.c3
5 files changed, 38 insertions, 11 deletions
diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h
index cf512003e663..e6d90babc245 100644
--- a/arch/x86/include/asm/tlbflush.h
+++ b/arch/x86/include/asm/tlbflush.h
@@ -62,6 +62,7 @@ static inline void __flush_tlb_all(void)
static inline void __flush_tlb_one(unsigned long addr)
{
+ count_vm_event(NR_TLB_LOCAL_FLUSH_ONE);
__flush_tlb_single(addr);
}
@@ -84,14 +85,38 @@ static inline void __flush_tlb_one(unsigned long addr)
#ifndef CONFIG_SMP
-#define flush_tlb() __flush_tlb()
-#define flush_tlb_all() __flush_tlb_all()
-#define local_flush_tlb() __flush_tlb()
+/* "_up" is for UniProcessor.
+ *
+ * This is a helper for other header functions. *Not* intended to be called
+ * directly. All global TLB flushes need to either call this, or to bump the
+ * vm statistics themselves.
+ */
+static inline void __flush_tlb_up(void)
+{
+ count_vm_event(NR_TLB_LOCAL_FLUSH_ALL);
+ __flush_tlb();
+}
+
+static inline void flush_tlb_all(void)
+{
+ count_vm_event(NR_TLB_LOCAL_FLUSH_ALL);
+ __flush_tlb_all();
+}
+
+static inline void flush_tlb(void)
+{
+ __flush_tlb_up();
+}
+
+static inline void local_flush_tlb(void)
+{
+ __flush_tlb_up();
+}
static inline void flush_tlb_mm(struct mm_struct *mm)
{
if (mm == current->active_mm)
- __flush_tlb();
+ __flush_tlb_up();
}
static inline void flush_tlb_page(struct vm_area_struct *vma,
@@ -105,14 +130,14 @@ static inline void flush_tlb_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
if (vma->vm_mm == current->active_mm)
- __flush_tlb();
+ __flush_tlb_up();
}
static inline void flush_tlb_mm_range(struct mm_struct *mm,
unsigned long start, unsigned long end, unsigned long vmflag)
{
if (mm == current->active_mm)
- __flush_tlb();
+ __flush_tlb_up();
}
static inline void native_flush_tlb_others(const struct cpumask *cpumask,
diff --git a/arch/x86/kernel/cpu/mtrr/generic.c b/arch/x86/kernel/cpu/mtrr/generic.c
index d4cdfa67509e..ce2d0a2c3e4f 100644
--- a/arch/x86/kernel/cpu/mtrr/generic.c
+++ b/arch/x86/kernel/cpu/mtrr/generic.c
@@ -683,6 +683,7 @@ static void prepare_set(void) __acquires(set_atomicity_lock)
}
/* Flush all TLBs via a mov %cr3, %reg; mov %reg, %cr3 */
+ count_vm_event(NR_TLB_LOCAL_FLUSH_ALL);
__flush_tlb();
/* Save MTRR state */
@@ -696,6 +697,7 @@ static void prepare_set(void) __acquires(set_atomicity_lock)
static void post_set(void) __releases(set_atomicity_lock)
{
/* Flush TLBs (no need to flush caches - they are disabled) */
+ count_vm_event(NR_TLB_LOCAL_FLUSH_ALL);
__flush_tlb();
/* Intel (P6) standard MTRRs */
diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index f030cbe669a5..ae699b3bbac8 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -280,10 +280,8 @@ static void do_kernel_range_flush(void *info)
unsigned long addr;
/* flush range by one by one 'invlpg' */
- for (addr = f->flush_start; addr < f->flush_end; addr += PAGE_SIZE) {
- count_vm_event(NR_TLB_LOCAL_FLUSH_ONE_KERNEL);
+ for (addr = f->flush_start; addr < f->flush_end; addr += PAGE_SIZE)
__flush_tlb_single(addr);
- }
}
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index dc2cdf07ac14..1855f0a22add 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -70,11 +70,12 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
THP_ZERO_PAGE_ALLOC,
THP_ZERO_PAGE_ALLOC_FAILED,
#endif
+#ifdef CONFIG_SMP
NR_TLB_REMOTE_FLUSH, /* cpu tried to flush others' tlbs */
NR_TLB_REMOTE_FLUSH_RECEIVED,/* cpu received ipi for flush */
+#endif
NR_TLB_LOCAL_FLUSH_ALL,
NR_TLB_LOCAL_FLUSH_ONE,
- NR_TLB_LOCAL_FLUSH_ONE_KERNEL,
NR_VM_EVENT_ITEMS
};
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 00382c53f582..ca06e9653827 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -817,11 +817,12 @@ const char * const vmstat_text[] = {
"thp_zero_page_alloc",
"thp_zero_page_alloc_failed",
#endif
+#ifdef CONFIG_SMP
"nr_tlb_remote_flush",
"nr_tlb_remote_flush_received",
+#endif
"nr_tlb_local_flush_all",
"nr_tlb_local_flush_one",
- "nr_tlb_local_flush_one_kernel",
#endif /* CONFIG_VM_EVENTS_COUNTERS */
};