JBD2: Group short-lived and reclaimable kernel allocations From: Mingming Cao <cmm@xxxxxxxxxx> Ported from JBD to JBD2 -------------------------------- From: Mel Gorman <mel@xxxxxxxxx> 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 <mel@xxxxxxxxx> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Mingming Cao <cmm@xxxxxxxxxx> --- --- 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; - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
