Messages in this thread Patch in this message | | | From | Mel Gorman <> | Subject | [PATCH 3/6] Remember what the preferred zone is for zone_statistics | Date | Wed, 21 Nov 2007 00:39:48 +0000 (GMT) |
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On NUMA, zone_statistics() is used to record events like numa hit, miss and foreign. It assumes that the first zone in a zonelist is the preferred zone. When multiple zonelists are replaced by one that is filtered, this is no longer the case.
This patch records what the preferred zone is rather than assuming the first zone in the zonelist is it. This simplifies the reading of later patches in this set.
Signed-off-by: Mel Gorman <mel@csn.ul.ie> ---
include/linux/vmstat.h | 2 +- mm/page_alloc.c | 9 +++++---- mm/vmstat.c | 6 +++--- 3 files changed, 9 insertions(+), 8 deletions(-)
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.24-rc2-mm1-007_node_zonelist/include/linux/vmstat.h linux-2.6.24-rc2-mm1-008_preferred/include/linux/vmstat.h --- linux-2.6.24-rc2-mm1-007_node_zonelist/include/linux/vmstat.h 2007-11-19 18:52:36.000000000 +0000 +++ linux-2.6.24-rc2-mm1-008_preferred/include/linux/vmstat.h 2007-11-20 23:26:35.000000000 +0000 @@ -174,7 +174,7 @@ static inline unsigned long node_page_st zone_page_state(&zones[ZONE_MOVABLE], item); } -extern void zone_statistics(struct zonelist *, struct zone *); +extern void zone_statistics(struct zone *, struct zone *); #else diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.24-rc2-mm1-007_node_zonelist/mm/page_alloc.c linux-2.6.24-rc2-mm1-008_preferred/mm/page_alloc.c --- linux-2.6.24-rc2-mm1-007_node_zonelist/mm/page_alloc.c 2007-11-20 23:26:05.000000000 +0000 +++ linux-2.6.24-rc2-mm1-008_preferred/mm/page_alloc.c 2007-11-20 23:26:35.000000000 +0000 @@ -1050,7 +1050,7 @@ void split_page(struct page *page, unsig * we cheat by calling it from here, in the order > 0 path. Saves a branch * or two. */ -static struct page *buffered_rmqueue(struct zonelist *zonelist, +static struct page *buffered_rmqueue(struct zone *preferred_zone, struct zone *zone, int order, gfp_t gfp_flags) { unsigned long flags; @@ -1096,7 +1096,7 @@ again: } __count_zone_vm_events(PGALLOC, zone, 1 << order); - zone_statistics(zonelist, zone); + zone_statistics(preferred_zone, zone); local_irq_restore(flags); put_cpu(); @@ -1377,7 +1377,7 @@ get_page_from_freelist(gfp_t gfp_mask, u struct zone **z; struct page *page = NULL; int classzone_idx = zone_idx(zonelist->zones[0]); - struct zone *zone; + struct zone *zone, *preferred_zone; nodemask_t *allowednodes = NULL;/* zonelist_cache approximation */ int zlc_active = 0; /* set if using zonelist_cache */ int did_zlc_setup = 0; /* just call zlc_setup() one time */ @@ -1389,6 +1389,7 @@ zonelist_scan: * See also cpuset_zone_allowed() comment in kernel/cpuset.c. */ z = zonelist->zones; + preferred_zone = *z; do { /* @@ -1427,7 +1428,7 @@ zonelist_scan: } } - page = buffered_rmqueue(zonelist, zone, order, gfp_mask); + page = buffered_rmqueue(preferred_zone, zone, order, gfp_mask); if (page) break; this_zone_full: diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.24-rc2-mm1-007_node_zonelist/mm/vmstat.c linux-2.6.24-rc2-mm1-008_preferred/mm/vmstat.c --- linux-2.6.24-rc2-mm1-007_node_zonelist/mm/vmstat.c 2007-11-15 11:28:11.000000000 +0000 +++ linux-2.6.24-rc2-mm1-008_preferred/mm/vmstat.c 2007-11-20 23:26:35.000000000 +0000 @@ -363,13 +363,13 @@ void refresh_cpu_vm_stats(int cpu) * * Must be called with interrupts disabled. */ -void zone_statistics(struct zonelist *zonelist, struct zone *z) +void zone_statistics(struct zone *preferred_zone, struct zone *z) { - if (z->zone_pgdat == zonelist->zones[0]->zone_pgdat) { + if (z->zone_pgdat == preferred_zone->zone_pgdat) { __inc_zone_state(z, NUMA_HIT); } else { __inc_zone_state(z, NUMA_MISS); - __inc_zone_state(zonelist->zones[0], NUMA_FOREIGN); + __inc_zone_state(preferred_zone, NUMA_FOREIGN); } if (z->node == numa_node_id()) __inc_zone_state(z, NUMA_LOCAL); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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