JBD2: Group short-lived and reclaimable kernel allocations
From: Mingming Cao <[email protected]>
Ported from JBD to JBD2
--------------------------------
From: Mel Gorman <[email protected]>
Date: Tue, 16 Oct 2007 08:25:52 +0000 (-0700)
Subject: Group short-lived and reclaimable kernel allocations
X-Git-Tag: v2.6.24-rc1~1137
X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=e12ba74d8ff3e2f73a583500d7095e406df4d093
Group short-lived and reclaimable kernel allocations
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.
Cc: Mel Gorman <[email protected]>
Cc: Andrew Morton <[email protected]>
Signed-off-by: Mingming Cao <[email protected]>
---
---
fs/jbd2/journal.c | 4 ++--
fs/jbd2/revoke.c | 6 ++++--
2 files changed, 6 insertions(+), 4 deletions(-)
Index: linux-2.6.24-rc7/fs/jbd2/journal.c
===================================================================
--- linux-2.6.24-rc7.orig/fs/jbd2/journal.c 2008-01-16 15:02:40.000000000 -0800
+++ linux-2.6.24-rc7/fs/jbd2/journal.c 2008-01-16 17:40:24.000000000 -0800
@@ -1975,7 +1975,7 @@ static int journal_init_jbd2_journal_hea
jbd2_journal_head_cache = kmem_cache_create("jbd2_journal_head",
sizeof(struct journal_head),
0, /* offset */
- 0, /* flags */
+ SLAB_TEMPORARY, /* flags */
NULL); /* ctor */
retval = 0;
if (jbd2_journal_head_cache == 0) {
@@ -2271,7 +2271,7 @@ static int __init journal_init_handle_ca
jbd2_handle_cache = kmem_cache_create("jbd2_journal_handle",
sizeof(handle_t),
0, /* offset */
- 0, /* flags */
+ SLAB_TEMPORARY, /* flags */
NULL); /* ctor */
if (jbd2_handle_cache == NULL) {
printk(KERN_EMERG "JBD: failed to create handle cache\n");
Index: linux-2.6.24-rc7/fs/jbd2/revoke.c
===================================================================
--- linux-2.6.24-rc7.orig/fs/jbd2/revoke.c 2008-01-06 13:45:38.000000000 -0800
+++ linux-2.6.24-rc7/fs/jbd2/revoke.c 2008-01-16 17:40:24.000000000 -0800
@@ -171,13 +171,15 @@ int __init jbd2_journal_init_revoke_cach
{
jbd2_revoke_record_cache = kmem_cache_create("jbd2_revoke_record",
sizeof(struct jbd2_revoke_record_s),
- 0, SLAB_HWCACHE_ALIGN, NULL);
+ 0,
+ SLAB_HWCACHE_ALIGN|SLAB_TEMPORARY,
+ NULL);
if (jbd2_revoke_record_cache == 0)
return -ENOMEM;
jbd2_revoke_table_cache = kmem_cache_create("jbd2_revoke_table",
sizeof(struct jbd2_revoke_table_s),
- 0, 0, NULL);
+ 0, SLAB_TEMPORARY, NULL);
if (jbd2_revoke_table_cache == 0) {
kmem_cache_destroy(jbd2_revoke_record_cache);
jbd2_revoke_record_cache = NULL;