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Subject[UnifiedV4 16/16] slub: Add stats for alien allocation slowpath
Add counters and consistently count alien allocations that
have to go to the page allocator.

Signed-off-by: Christoph Lameter <cl@linux.com>

---
include/linux/slub_def.h | 2 ++
mm/slub.c | 7 ++++++-
2 files changed, 8 insertions(+), 1 deletion(-)
Index: linux-2.6/include/linux/slub_def.h
===================================================================
--- linux-2.6.orig/include/linux/slub_def.h 2010-10-05 13:40:04.000000000 -0500
+++ linux-2.6/include/linux/slub_def.h 2010-10-05 13:40:14.000000000 -0500
@@ -19,12 +19,14 @@ enum stat_item {
ALLOC_FASTPATH, /* Allocation from cpu queue */
ALLOC_SHARED, /* Allocation caused a shared cache transaction */
ALLOC_ALIEN, /* Allocation from alien cache */
+ ALLOC_ALIEN_SLOW, /* Alien allocation from partial */
ALLOC_DIRECT, /* Allocation bypassing queueing */
ALLOC_SLOWPATH, /* Allocation required refilling of queue */
FREE_FASTPATH, /* Free to cpu queue */
FREE_SHARED, /* Free caused a shared cache transaction */
FREE_DIRECT, /* Free bypassing queues */
FREE_ALIEN, /* Free to alien node */
+ FREE_ALIEN_SLOW, /* Alien free had to drain cache */
FREE_SLOWPATH, /* Required pushing objects out of the queue */
FREE_ADD_PARTIAL, /* Freeing moved slab to partial list */
FREE_REMOVE_PARTIAL, /* Freeing removed from partial list */
Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c 2010-10-05 13:40:11.000000000 -0500
+++ linux-2.6/mm/slub.c 2010-10-05 13:40:14.000000000 -0500
@@ -2021,6 +2021,7 @@ redo:
}
}

+ stat(s, ALLOC_ALIEN_SLOW);
spin_lock(&n->lock);
if (!list_empty(&n->partial)) {

@@ -2108,7 +2109,7 @@ static void slab_free_alien(struct kmem_
if (touched)
stat(s, FREE_ALIEN);
else
- stat(s, FREE_SLOWPATH);
+ stat(s, FREE_ALIEN_SLOW);

} else {
/* Direct free to the slab */
@@ -5430,11 +5431,13 @@ SLAB_ATTR(text); \
STAT_ATTR(ALLOC_FASTPATH, alloc_fastpath);
STAT_ATTR(ALLOC_SHARED, alloc_shared);
STAT_ATTR(ALLOC_ALIEN, alloc_alien);
+STAT_ATTR(ALLOC_ALIEN_SLOW, alloc_alien_slow);
STAT_ATTR(ALLOC_DIRECT, alloc_direct);
STAT_ATTR(ALLOC_SLOWPATH, alloc_slowpath);
STAT_ATTR(FREE_FASTPATH, free_fastpath);
STAT_ATTR(FREE_SHARED, free_shared);
STAT_ATTR(FREE_ALIEN, free_alien);
+STAT_ATTR(FREE_ALIEN_SLOW, free_alien_slow);
STAT_ATTR(FREE_DIRECT, free_direct);
STAT_ATTR(FREE_SLOWPATH, free_slowpath);
STAT_ATTR(FREE_ADD_PARTIAL, free_add_partial);
@@ -5494,9 +5497,11 @@ static struct attribute *slab_attrs[] =
&alloc_alien_attr.attr,
&alloc_direct_attr.attr,
&alloc_slowpath_attr.attr,
+ &alloc_alien_slow_attr.attr,
&free_fastpath_attr.attr,
&free_shared_attr.attr,
&free_alien_attr.attr,
+ &free_alien_slow_attr.attr,
&free_direct_attr.attr,
&free_slowpath_attr.attr,
&free_add_partial_attr.attr,


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