PATCH Migrate-on-fault 8/8 - add statistics
Count migrate-on-fault events:
+ pglocchecked -- page location checked for misplacement
+ pgmisplaced -- page misplaced -- location != policy
+ pgmigrated -- page successfully migrated
Note: currently, pgmigrated is only counted when migrate-on-fault
is configured. However, it will count all successful migrations,
including "direct" migrations. This should be promoted to depend
only on CONFIG_MIGRATE.
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@xxxxxx>
include/linux/vmstat.h | 3 +++
mm/migrate.c | 11 +++++++++++
mm/vmstat.c | 5 +++++
3 files changed, 19 insertions(+)
Index: linux-2.6.36-mmotm-101103-1217/include/linux/vmstat.h
===================================================================
--- linux-2.6.36-mmotm-101103-1217.orig/include/linux/vmstat.h
+++ linux-2.6.36-mmotm-101103-1217/include/linux/vmstat.h
@@ -58,6 +58,9 @@ enum vm_event_item { PGPGIN, PGPGOUT, PS
UNEVICTABLE_PGCLEARED, /* on COW, page truncate */
UNEVICTABLE_PGSTRANDED, /* unable to isolate on unlock */
UNEVICTABLE_MLOCKFREED,
+#ifdef CONFIG_MIGRATE_ON_FAULT
+ PGLOCCHECK, PGMISPLACED, PGMIGRATED,
+#endif
NR_VM_EVENT_ITEMS
};
Index: linux-2.6.36-mmotm-101103-1217/mm/vmstat.c
===================================================================
--- linux-2.6.36-mmotm-101103-1217.orig/mm/vmstat.c
+++ linux-2.6.36-mmotm-101103-1217/mm/vmstat.c
@@ -864,6 +864,11 @@ static const char * const vmstat_text[]
"unevictable_pgs_cleared",
"unevictable_pgs_stranded",
"unevictable_pgs_mlockfreed",
+#ifdef CONFIG_MIGRATE_ON_FAULT
+ "pglocchecked",
+ "pgmisplaced",
+ "pgmigrated",
+#endif
#endif
};
Index: linux-2.6.36-mmotm-101103-1217/mm/migrate.c
===================================================================
--- linux-2.6.36-mmotm-101103-1217.orig/mm/migrate.c
+++ linux-2.6.36-mmotm-101103-1217/mm/migrate.c
@@ -34,6 +34,7 @@
#include <linux/syscalls.h>
#include <linux/hugetlb.h>
#include <linux/gfp.h>
+#include <linux/vmstat.h>
#include "internal.h"
@@ -410,6 +411,14 @@ void migrate_page_copy(struct page *newp
*/
if (PageWriteback(newpage))
end_page_writeback(newpage);
+
+ /*
+ * all successful migrations come through here.
+ */
+#ifdef CONFIG_MIGRATE_ON_FAULT
+//TODO: promote statistics to CONFIG_MIGRATE?
+ count_vm_event(PGMIGRATED);
+#endif
}
/************************************************************
@@ -1586,10 +1595,12 @@ struct page *check_migrate_misplaced_pag
!page_mapping(page)->a_ops->migratepage)
return page;
+ count_vm_event(PGLOCCHECK);
misplaced = mpol_misplaced(page, vma, address, &polnid);
if (!misplaced)
return page;
+ count_vm_event(PGMISPLACED);
return migrate_misplaced_page(page, vma->vm_mm, polnid,
misplaced_is_interleaved(misplaced));
--
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