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[PATCH] mm: move determination of policy_zone into page allocator

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Currently the function to build a zonelist for a BIND policy has the side
effect to set the policy_zone.  This seems to be a bit strange.  policy
zone seems to not be initialized elsewhere and therefore 0.  Do we police
ZONE_DMA if no bind policy has been used yet?

This patch moves the determination of the zone to apply policies to into
the page allocator.  We determine the zone while building the zonelist for
nodes.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Lameter 2006-01-06 00:11:17 -08:00 committed by Linus Torvalds
parent 1a93205bdf
commit 4be38e351c
3 changed files with 16 additions and 12 deletions
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11
include/linux/mempolicy.h
View File

@ -151,6 +151,14 @@ extern struct mempolicy default_policy;
extern struct zonelist *huge_zonelist(struct vm_area_struct *vma,
unsigned long addr);
extern int policy_zone;
static inline void check_highest_zone(int k)
{
if (k > policy_zone)
policy_zone = k;
}
#else
struct mempolicy {};
@ -221,6 +229,9 @@ static inline struct zonelist *huge_zonelist(struct vm_area_struct *vma,
return NODE_DATA(0)->node_zonelists + gfp_zone(GFP_HIGHUSER);
}
static inline void check_highest_zone(int k)
{
}
#endif /* CONFIG_NUMA */
#endif /* __KERNEL__ */

15
mm/mempolicy.c
View File

@ -93,7 +93,7 @@ static kmem_cache_t *sn_cache;
/* Highest zone. An specific allocation for a zone below that is not
policied. */
static int policy_zone;
int policy_zone = ZONE_DMA;
struct mempolicy default_policy = {
.refcnt = ATOMIC_INIT(1), /* never free it */
@ -131,17 +131,8 @@ static struct zonelist *bind_zonelist(nodemask_t *nodes)
if (!zl)
return NULL;
num = 0;
for_each_node_mask(nd, *nodes) {
int k;
for (k = MAX_NR_ZONES-1; k >= 0; k--) {
struct zone *z = &NODE_DATA(nd)->node_zones[k];
if (!z->present_pages)
continue;
zl->zones[num++] = z;
if (k > policy_zone)
policy_zone = k;
}
}
for_each_node_mask(nd, *nodes)
zl->zones[num++] = &NODE_DATA(nd)->node_zones[policy_zone];
zl->zones[num] = NULL;
return zl;
}

2
mm/page_alloc.c
View File

@ -36,6 +36,7 @@
#include <linux/memory_hotplug.h>
#include <linux/nodemask.h>
#include <linux/vmalloc.h>
#include <linux/mempolicy.h>
#include <asm/tlbflush.h>
#include "internal.h"
@ -1470,6 +1471,7 @@ static int __init build_zonelists_node(pg_data_t *pgdat,
BUG_ON(zone - pgdat->node_zones > ZONE_NORMAL);
#endif
zonelist->zones[j++] = zone;
check_highest_zone(k);
}
}
return j;