[PATCH] Reorder ZVCs according to cacheline (51ed4491) · Commits · 戴 / test

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

+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",

Admin message