From 51ed4491271be8c56bdb2a03481ed34ea4984bc2 Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Sat, 10 Feb 2007 01:43:02 -0800 Subject: [PATCH] Reorder ZVCs according to cacheline The global and per zone counter sums are in arrays of longs. Reorder the ZVCs so that the most frequently used ZVCs are put into the same cacheline. That way calculations of the global, node and per zone vm state touches only a single cacheline. This is mostly important for 64 bit systems were one 128 byte cacheline takes only 8 longs. Signed-off-by: Christoph Lameter Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/mmzone.h | 8 +++++--- mm/vmstat.c | 4 ++-- 2 files changed, 7 insertions(+), 5 deletions(-) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 824279c7884d..d15b1f68aef9 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -47,6 +47,7 @@ struct zone_padding { #endif enum zone_stat_item { + /* First 128 byte cacheline (assuming 64 bit words) */ NR_FREE_PAGES, NR_INACTIVE, NR_ACTIVE, @@ -54,11 +55,12 @@ enum zone_stat_item { NR_FILE_MAPPED, /* pagecache pages mapped into pagetables. only modified from process context */ NR_FILE_PAGES, - NR_SLAB_RECLAIMABLE, - NR_SLAB_UNRECLAIMABLE, - NR_PAGETABLE, /* used for pagetables */ NR_FILE_DIRTY, NR_WRITEBACK, + /* Second 128 byte cacheline */ + NR_SLAB_RECLAIMABLE, + NR_SLAB_UNRECLAIMABLE, + NR_PAGETABLE, /* used for pagetables */ NR_UNSTABLE_NFS, /* NFS unstable pages */ NR_BOUNCE, NR_VMSCAN_WRITE, diff --git a/mm/vmstat.c b/mm/vmstat.c index 2386716f1754..2ee7ec5e003f 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -447,11 +447,11 @@ static const char * const vmstat_text[] = { "nr_anon_pages", "nr_mapped", "nr_file_pages", + "nr_dirty", + "nr_writeback", "nr_slab_reclaimable", "nr_slab_unreclaimable", "nr_page_table_pages", - "nr_dirty", - "nr_writeback", "nr_unstable", "nr_bounce", "nr_vmscan_write", -- cgit v1.2.2