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mm: use two zonelist that are filtered by GFP mask

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Currently a node has two sets of zonelists, one for each zone type in the
system and a second set for GFP_THISNODE allocations.  Based on the zones
allowed by a gfp mask, one of these zonelists is selected.  All of these
zonelists consume memory and occupy cache lines.

This patch replaces the multiple zonelists per-node with two zonelists.  The
first contains all populated zones in the system, ordered by distance, for
fallback allocations when the target/preferred node has no free pages.  The
second contains all populated zones in the node suitable for GFP_THISNODE
allocations.

An iterator macro is introduced called for_each_zone_zonelist() that interates
through each zone allowed by the GFP flags in the selected zonelist.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Christoph Lameter <clameter@sgi.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: Hugh Dickins <hugh@veritas.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mel Gorman 2008-04-28 02:12:16 -07:00 • committed by Linus Torvalds
parent 18ea7e710d
commit 54a6eb5c47
10 changed files with 168 additions and 154 deletions
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65
include/linux/mmzone.h
View file

@ -393,10 +393,10 @@ static inline int zone_is_oom_locked(const struct zone *zone)
* The NUMA zonelists are doubled becausse we need zonelists that restrict the
* allocations to a single node for GFP_THISNODE.
*
* [0 .. MAX_NR_ZONES -1] : Zonelists with fallback
* [MAZ_NR_ZONES ... MAZ_ZONELISTS -1] : No fallback (GFP_THISNODE)
* [0] : Zonelist with fallback
* [1] : No fallback (GFP_THISNODE)
*/
#define MAX_ZONELISTS (2 * MAX_NR_ZONES)
#define MAX_ZONELISTS 2
/*
@ -464,7 +464,7 @@ struct zonelist_cache {
unsigned long last_full_zap; /* when last zap'd (jiffies) */
};
#else
#define MAX_ZONELISTS MAX_NR_ZONES
#define MAX_ZONELISTS 1
struct zonelist_cache;
#endif
@ -486,24 +486,6 @@ struct zonelist {
#endif
};
#ifdef CONFIG_NUMA
/*
* Only custom zonelists like MPOL_BIND need to be filtered as part of
* policies. As described in the comment for struct zonelist_cache, these
* zonelists will not have a zlcache so zlcache_ptr will not be set. Use
* that to determine if the zonelists needs to be filtered or not.
*/
static inline int alloc_should_filter_zonelist(struct zonelist *zonelist)
{
return !zonelist->zlcache_ptr;
}
#else
static inline int alloc_should_filter_zonelist(struct zonelist *zonelist)
{
return 0;
}
#endif /* CONFIG_NUMA */
#ifdef CONFIG_ARCH_POPULATES_NODE_MAP
struct node_active_region {
unsigned long start_pfn;
@ -731,6 +713,45 @@ extern struct zone *next_zone(struct zone *zone);
zone; \
zone = next_zone(zone))
/* Returns the first zone at or below highest_zoneidx in a zonelist */
static inline struct zone **first_zones_zonelist(struct zonelist *zonelist,
enum zone_type highest_zoneidx)
{
struct zone **z;
/* Find the first suitable zone to use for the allocation */
z = zonelist->zones;
while (*z && zone_idx(*z) > highest_zoneidx)
z++;
return z;
}
/* Returns the next zone at or below highest_zoneidx in a zonelist */
static inline struct zone **next_zones_zonelist(struct zone **z,
enum zone_type highest_zoneidx)
{
/* Find the next suitable zone to use for the allocation */
while (*z && zone_idx(*z) > highest_zoneidx)
z++;
return z;
}
/**
* for_each_zone_zonelist - helper macro to iterate over valid zones in a zonelist at or below a given zone index
* @zone - The current zone in the iterator
* @z - The current pointer within zonelist->zones being iterated
* @zlist - The zonelist being iterated
* @highidx - The zone index of the highest zone to return
*
* This iterator iterates though all zones at or below a given zone index.
*/
#define for_each_zone_zonelist(zone, z, zlist, highidx) \
for (z = first_zones_zonelist(zlist, highidx), zone = *z++; \
zone; \
z = next_zones_zonelist(z, highidx), zone = *z++)
#ifdef CONFIG_SPARSEMEM
#include <asm/sparsemem.h>
#endif