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Group short-lived and reclaimable kernel allocations

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This patch marks a number of allocations that are either short-lived such as
network buffers or are reclaimable such as inode allocations.  When something
like updatedb is called, long-lived and unmovable kernel allocations tend to
be spread throughout the address space which increases fragmentation.

This patch groups these allocations together as much as possible by adding a
new MIGRATE_TYPE.  The MIGRATE_RECLAIMABLE type is for allocations that can be
reclaimed on demand, but not moved.  i.e.  they can be migrated by deleting
them and re-reading the information from elsewhere.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Cc: Andy Whitcroft <apw@shadowen.org>
Cc: Christoph Lameter <clameter@sgi.com>
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 2007-10-16 01:25:52 -07:00 • committed by Linus Torvalds
parent c361be55b3
commit e12ba74d8f
16 changed files with 56 additions and 28 deletions
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6
lib/radix-tree.c
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@ -98,7 +98,8 @@ radix_tree_node_alloc(struct radix_tree_root *root)
struct radix_tree_node *ret;
gfp_t gfp_mask = root_gfp_mask(root);
ret = kmem_cache_alloc(radix_tree_node_cachep, gfp_mask);
ret = kmem_cache_alloc(radix_tree_node_cachep,
set_migrateflags(gfp_mask, __GFP_RECLAIMABLE));
if (ret == NULL && !(gfp_mask & __GFP_WAIT)) {
struct radix_tree_preload *rtp;
@ -142,7 +143,8 @@ int radix_tree_preload(gfp_t gfp_mask)
rtp = &__get_cpu_var(radix_tree_preloads);
while (rtp->nr < ARRAY_SIZE(rtp->nodes)) {
preempt_enable();
node = kmem_cache_alloc(radix_tree_node_cachep, gfp_mask);
node = kmem_cache_alloc(radix_tree_node_cachep,
set_migrateflags(gfp_mask, __GFP_RECLAIMABLE));
if (node == NULL)
goto out;
preempt_disable();