[PATCH] Reorder ZVCs according to cacheline
authorChristoph Lameter <clameter@sgi.com>
Sat, 10 Feb 2007 09:43:02 +0000 (01:43 -0800)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Sun, 11 Feb 2007 18:51:17 +0000 (10:51 -0800)
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 <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/linux/mmzone.h
mm/vmstat.c

index 824279c..d15b1f6 100644 (file)
@@ -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,
index 2386716..2ee7ec5 100644 (file)
@@ -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",