[PATCH] mm: vmstats: track TLB flush stats on UP too
From: Dave Hansen
Date: Fri Jul 19 2013 - 16:40:13 EST
Andrew, this fixes up the TLB flush vmstats for UP. It's on top
of the previous patch, but I'm happy to combine them and send a
replacement if you'd prefer.
This also removes the NR_TLB_LOCAL_FLUSH_ONE_KERNEL counter. We
do not have a good API on UP to separate out the kernel from the
non-kernel flushes. It's probably not an important distinction
anyway.
Compile and boot tested on 64-bit SMP and UP. Compile tested
for x86_32 SMP.
--
The previous patch doing vmstats for TLB flushes 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.
Signed-off-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
---
linux.git-davehans/arch/x86/include/asm/tlbflush.h | 38 +++++++++++++++---
linux.git-davehans/arch/x86/kernel/cpu/mtrr/generic.c | 2
linux.git-davehans/arch/x86/mm/tlb.c | 4 -
linux.git-davehans/include/linux/vm_event_item.h | 3 -
linux.git-davehans/mm/vmstat.c | 3 -
5 files changed, 39 insertions(+), 11 deletions(-)
diff -puN include/linux/vm_event_item.h~compile-useless-stats-out-on-up include/linux/vm_event_item.h
--- linux.git/include/linux/vm_event_item.h~compile-useless-stats-out-on-up 2013-07-19 08:21:37.408237538 -0700
+++ linux.git-davehans/include/linux/vm_event_item.h 2013-07-19 09:13:16.903143205 -0700
@@ -70,11 +70,12 @@ enum vm_event_item { PGPGIN, PGPGOUT, PS
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 -puN mm/vmstat.c~compile-useless-stats-out-on-up mm/vmstat.c
--- linux.git/mm/vmstat.c~compile-useless-stats-out-on-up 2013-07-19 08:21:37.410237627 -0700
+++ linux.git-davehans/mm/vmstat.c 2013-07-19 09:13:29.388694341 -0700
@@ -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 */
};
diff -puN arch/x86/mm/tlb.c~compile-useless-stats-out-on-up arch/x86/mm/tlb.c
--- linux.git/arch/x86/mm/tlb.c~compile-useless-stats-out-on-up 2013-07-19 08:21:37.411237672 -0700
+++ linux.git-davehans/arch/x86/mm/tlb.c 2013-07-19 09:10:16.183165988 -0700
@@ -280,10 +280,8 @@ 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) {
- 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 -puN arch/x86/mm/Makefile~compile-useless-stats-out-on-up arch/x86/mm/Makefile
diff -puN arch/x86/kernel/cpu/mtrr/generic.c~compile-useless-stats-out-on-up arch/x86/kernel/cpu/mtrr/generic.c
--- linux.git/arch/x86/kernel/cpu/mtrr/generic.c~compile-useless-stats-out-on-up 2013-07-19 08:30:41.081279304 -0700
+++ linux.git-davehans/arch/x86/kernel/cpu/mtrr/generic.c 2013-07-19 13:21:55.160158221 -0700
@@ -683,6 +683,7 @@ static void prepare_set(void) __acquires
}
/* 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
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 -puN arch/x86/include/asm/paravirt.h~compile-useless-stats-out-on-up arch/x86/include/asm/paravirt.h
diff -puN arch/x86/include/asm/tlbflush.h~compile-useless-stats-out-on-up arch/x86/include/asm/tlbflush.h
--- linux.git/arch/x86/include/asm/tlbflush.h~compile-useless-stats-out-on-up 2013-07-19 08:31:48.158245363 -0700
+++ linux.git-davehans/arch/x86/include/asm/tlbflush.h 2013-07-19 13:24:14.022307785 -0700
@@ -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 +85,39 @@ static inline void __flush_tlb_one(unsig
#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 do the 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 +131,14 @@ static inline void flush_tlb_range(struc
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 -puN arch/x86/include/asm/cpufeature.h~compile-useless-stats-out-on-up arch/x86/include/asm/cpufeature.h
diff -puN arch/x86/mm/init_64.c~compile-useless-stats-out-on-up arch/x86/mm/init_64.c
_
--
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