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[PATCH] Use Zoned VM Counters for NUMA statistics

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The numa statistics are really event counters.  But they are per node and
so we have had special treatment for these counters through additional
fields on the pcp structure.  We can now use the per zone nature of the
zoned VM counters to realize these.

This will shrink the size of the pcp structure on NUMA systems.  We will
have some room to add additional per zone counters that will all still fit
in the same cacheline.

 Bits	Prior pcp size	  	Size after patch	We can add
 ------------------------------------------------------------------
 64	128 bytes (16 words)	80 bytes (10 words)	48
 32	 76 bytes (19 words)	56 bytes (14 words)	8 (64 byte cacheline)
							72 (128 byte)

Remove the special statistics for numa and replace them with zoned vm
counters.  This has the side effect that global sums of these events now
show up in /proc/vmstat.

Also take the opportunity to move the zone_statistics() function from
page_alloc.c into vmstat.c.

Discussions:
V2 http://marc.theaimsgroup.com/?t=115048227000002&r=1&w=2

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Acked-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Lameter 2006-06-30 01:55:44 -07:00 • committed by Linus Torvalds
parent bab1846a05
commit ca889e6c45
6 changed files with 73 additions and 90 deletions
Download patch file Download diff file Expand all files Collapse all files

10
include/linux/vmstat.h
View file

@ -173,9 +173,15 @@ static inline unsigned long node_page_state(int node,
#endif
zone_page_state(&zones[ZONE_DMA], item);
}
extern void zone_statistics(struct zonelist *, struct zone *);
#else
#define node_page_state(node, item) global_page_state(item)
#endif
#define zone_statistics(_zl,_z) do { } while (0)
#endif /* CONFIG_NUMA */
#define __add_zone_page_state(__z, __i, __d) \
__mod_zone_page_state(__z, __i, __d)
@ -190,6 +196,8 @@ static inline void zap_zone_vm_stats(struct zone *zone)
memset(zone->vm_stat, 0, sizeof(zone->vm_stat));
}
extern void inc_zone_state(struct zone *, enum zone_stat_item);
#ifdef CONFIG_SMP
void __mod_zone_page_state(struct zone *, enum zone_stat_item item, int);
void __inc_zone_page_state(struct page *, enum zone_stat_item);