The patch titled
memory page_alloc zonelist caching reorder structure
has been added to the -mm tree. Its filename is
memory-page_alloc-zonelist-caching-reorder-structure.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: memory page_alloc zonelist caching reorder structure
From: Paul Jackson <pj@xxxxxxx>
Rearrange the struct members in the 'struct zonelist_cache' structure, so
as to put the readonly (once initialized) z_to_n[] array first, where it
will come right after the zones[] array in struct zonelist.
This pretty much eliminates the chance that the two frequently written
elements of 'struct zonelist_cache', the fullzones bitmap and last_full_zap
times, will end up on the same cache line as the performance sensitive,
frequently read, never (after init) written zones[] array.
Keeping frequently written data off frequently read cache lines is good for
performance.
Thanks to Rohit Seth for the suggestion.
Signed-off-by: Paul Jackson <pj@xxxxxxx>
Cc: Rohit Seth <rohitseth@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
include/linux/mmzone.h | 2 +-
1 files changed, 1 insertion(+), 1 deletion(-)
diff -puN include/linux/mmzone.h~memory-page_alloc-zonelist-caching-reorder-structure include/linux/mmzone.h
--- a/include/linux/mmzone.h~memory-page_alloc-zonelist-caching-reorder-structure
+++ a/include/linux/mmzone.h
@@ -374,8 +374,8 @@ struct zone {
struct zonelist_cache {
- DECLARE_BITMAP(fullzones, MAX_ZONES_PER_ZONELIST); /* zone full? */
unsigned short z_to_n[MAX_ZONES_PER_ZONELIST]; /* zone->nid */
+ DECLARE_BITMAP(fullzones, MAX_ZONES_PER_ZONELIST); /* zone full? */
unsigned long last_full_zap; /* when last zap'd (jiffies) */
};
#else
_
Patches currently in -mm which might be from pj@xxxxxxx are
highest_possible_node_id-linkage-fix.patch
memory-page-alloc-minor-cleanups.patch
memory-page-alloc-minor-cleanups-fix.patch
memory-page_alloc-zonelist-caching-speedup.patch
memory-page_alloc-zonelist-caching-reorder-structure.patch
cpuset-minor-code-refinements.patch
-
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