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Subject[PATCH v10 23/25] mm: add speculative page fault vmstats
Date
Add speculative_pgfault vmstat counter to count successful speculative page
fault handling.

Also fixing a minor typo in include/linux/vm_event_item.h.

Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
---
include/linux/vm_event_item.h | 3 +++
mm/memory.c | 1 +
mm/vmstat.c | 5 ++++-
3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index 5c7f010676a7..a240acc09684 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -111,6 +111,9 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
SWAP_RA,
SWAP_RA_HIT,
#endif
+#ifdef CONFIG_SPECULATIVE_PAGE_FAULT
+ SPECULATIVE_PGFAULT,
+#endif
NR_VM_EVENT_ITEMS
};

diff --git a/mm/memory.c b/mm/memory.c
index 425f07e0bf38..1cd5bc000643 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4508,6 +4508,7 @@ int __handle_speculative_fault(struct mm_struct *mm, unsigned long address,
* If there is no need to retry, don't return the vma to the caller.
*/
if (ret != VM_FAULT_RETRY) {
+ count_vm_event(SPECULATIVE_PGFAULT);
put_vma(vmf.vma);
*vma = NULL;
}
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 536332e988b8..c6b49bfa8139 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1289,7 +1289,10 @@ const char * const vmstat_text[] = {
"swap_ra",
"swap_ra_hit",
#endif
-#endif /* CONFIG_VM_EVENTS_COUNTERS */
+#ifdef CONFIG_SPECULATIVE_PAGE_FAULT
+ "speculative_pgfault"
+#endif
+#endif /* CONFIG_VM_EVENT_COUNTERS */
};
#endif /* CONFIG_PROC_FS || CONFIG_SYSFS || CONFIG_NUMA */

--
2.7.4
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