]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
mm: have zonelist contains structs with both a zone pointer and zone_idx
authorMel Gorman <mel@csn.ul.ie>
Mon, 28 Apr 2008 09:12:17 +0000 (02:12 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Mon, 28 Apr 2008 15:58:18 +0000 (08:58 -0700)
commitdd1a239f6f2d4d3eedd318583ec319aa145b324c
treeaff4224c96b5e2e67588c3946858a724863eeaf9
parent54a6eb5c4765aa573a030ceeba2c14e3d2ea5706
mm: have zonelist contains structs with both a zone pointer and zone_idx

Filtering zonelists requires very frequent use of zone_idx().  This is costly
as it involves a lookup of another structure and a substraction operation.  As
the zone_idx is often required, it should be quickly accessible.  The node idx
could also be stored here if it was found that accessing zone->node is
significant which may be the case on workloads where nodemasks are heavily
used.

This patch introduces a struct zoneref to store a zone pointer and a zone
index.  The zonelist then consists of an array of these struct zonerefs which
are looked up as necessary.  Helpers are given for accessing the zone index as
well as the node index.

[kamezawa.hiroyu@jp.fujitsu.com: Suggested struct zoneref instead of embedding information in pointers]
[hugh@veritas.com: mm-have-zonelist: fix memcg ooms]
[hugh@veritas.com: just return do_try_to_free_pages]
[hugh@veritas.com: do_try_to_free_pages gfp_mask redundant]
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Christoph Lameter <clameter@sgi.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 files changed:
arch/parisc/mm/init.c
fs/buffer.c
include/linux/mmzone.h
include/linux/oom.h
kernel/cpuset.c
mm/hugetlb.c
mm/mempolicy.c
mm/oom_kill.c
mm/page_alloc.c
mm/slab.c
mm/slub.c
mm/vmscan.c