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Commit 51ed4491 authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds
Browse files

[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: default avatarChristoph Lameter <clameter@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent d23ad423

include/linux/mmzone.h

+5 −3
Original line number Diff line number Diff line
@@ -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_FILE_DIRTY,

	NR_WRITEBACK,

	/* Second 128 byte cacheline */

	NR_SLAB_RECLAIMABLE,

	NR_SLAB_UNRECLAIMABLE,

	NR_PAGETABLE,		/* used for pagetables */

	NR_FILE_DIRTY,

	NR_WRITEBACK,

	NR_UNSTABLE_NFS,	/* NFS unstable pages */

	NR_BOUNCE,

	NR_VMSCAN_WRITE,

mm/vmstat.c

+2 −2
Original line number Diff line number Diff line
@@ -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",