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authorChristoph Lameter <clameter@sgi.com>2006-06-30 01:55:44 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-30 11:25:36 -0700
commitca889e6c45e0b112cb2ca9d35afc66297519b5d5 (patch)
tree0a5efdec2a61540204d34bcbf56dc691d8f9c391 /mm/page_io.c
parentbab1846a0582f627f5ec22aa2dc5f4f3e82e8176 (diff)
downloadlinux-sh-ca889e6c45e0b112cb2ca9d35afc66297519b5d5.tar.gz
[PATCH] Use Zoned VM Counters for NUMA statistics
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>
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