AutoPage Migration - add vmstats
Add vmstats for auto-migration:
+ automig_tasks_migrated - number of times we scan a task's
address space to unmap pages controlled by local allocation
policy.
+ automig_pgs_scanned - the total number of pages scanned
[by check_range()] for automigration.
+ automig_pgs_selected - the total number of pages selected
[by migrate_page_add()] for auto-migration.
+ automig_pgs_failed - the number of [selected] pages that
we were not able to unmap/migrate.
We can compute the number of pages successfully unmapped or
migrated from the last two stats above.
Also, see the migrate-on-fault vmstats for information on
subsequent lazy page migrations.
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@xxxxxx>
include/linux/vmstat.h | 4 ++++
mm/mempolicy.c | 12 +++++++++++-
mm/vmstat.c | 6 ++++++
3 files changed, 21 insertions(+), 1 deletion(-)
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
@@ -61,6 +61,10 @@ enum vm_event_item { PGPGIN, PGPGOUT, PS
#ifdef CONFIG_MIGRATE_ON_FAULT
PGLOCCHECK, PGMISPLACED, PGMIGRATED,
#endif
+#ifdef CONFIG_AUTO_MIGRATION
+ AUTOMIG_TASKS_MIGRATED,
+ AUTOMIG_PGSCANNED, AUTOMIG_PGSELECTED, AUTOMIG_PGFAILED,
+#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
@@ -869,6 +869,12 @@ static const char * const vmstat_text[]
"pgmisplaced",
"pgmigrated",
#endif
+#ifdef CONFIG_AUTO_MIGRATION
+ "automig_tasks_migrated",
+ "automig_pgs_scanned",
+ "automig_pgs_selected",
+ "automig_pgs_failed",
+#endif
#endif
};
Index: linux-2.6.36-mmotm-101103-1217/mm/mempolicy.c
===================================================================
--- linux-2.6.36-mmotm-101103-1217.orig/mm/mempolicy.c
+++ linux-2.6.36-mmotm-101103-1217/mm/mempolicy.c
@@ -1050,6 +1050,9 @@ static long do_get_mempolicy(int *policy
static void migrate_page_add(struct page *page, struct list_head *pagelist,
unsigned long flags)
{
+ if (is_auto_migration(flags))
+ count_vm_event(AUTOMIG_PGSCANNED);
+
/*
* Avoid migrating a file backed page in a private mapping, or
* a page that is shared with > 'migrate_max_mapcount' others
@@ -1062,6 +1065,8 @@ static void migrate_page_add(struct page
list_add_tail(&page->lru, pagelist);
inc_zone_page_state(page, NR_ISOLATED_ANON +
page_is_file_cache(page));
+ if (is_auto_migration(flags))
+ count_vm_event(AUTOMIG_PGSELECTED);
}
}
}
@@ -1096,8 +1101,12 @@ static int migrate_to_node(struct mm_str
err = migrate_pages_unmap_only(&pagelist);
else
err = migrate_pages(&pagelist, new_node_page, dest, 0);
- if (err)
+ if (err) {
putback_lru_pages(&pagelist);
+
+ if (is_auto_migration(flags))
+ count_vm_events(AUTOMIG_PGFAILED, err);
+ }
}
return err;
@@ -1262,6 +1271,7 @@ void auto_migrate_task_memory(void)
* we're returning to user space, so mm must be non-NULL
*/
BUG_ON(!mm);
+ count_vm_event(AUTOMIG_TASKS_MIGRATED);
if (auto_migrate_lazy(current))
set_lazy_migration(flags);
--
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