summaryrefslogtreecommitdiffstats
path: root/include
diff options
context:
space:
mode:
authorPekka Enberg <penberg@cs.helsinki.fi>2009-01-07 18:07:25 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-08 08:31:00 -0800
commit5df096d67ec2b6578518caed7d57317a4b807aa1 (patch)
tree8e92d19c89dea347eed6fc018fc6e4388bf9ebdc /include
parentf420d4dc4272fd223986762df2ad06056ddebada (diff)
downloadop-kernel-dev-5df096d67ec2b6578518caed7d57317a4b807aa1.zip
op-kernel-dev-5df096d67ec2b6578518caed7d57317a4b807aa1.tar.gz
ext3: allocate ->s_blockgroup_lock separately
As spotted by kmemtrace, struct ext3_sb_info is 17152 bytes on 64-bit which makes it a very bad fit for SLAB allocators. The culprit of the wasted memory is ->s_blockgroup_lock which can be as big as 16 KB when NR_CPUS >= 32. To fix that, allocate ->s_blockgroup_lock, which fits nicely in a order 2 page in the worst case, separately. This shinks down struct ext3_sb_info enough to fit a 1 KB slab cache so now we allocate 16 KB + 1 KB instead of 32 KB saving 15 KB of memory. Acked-by: Andreas Dilger <adilger@sun.com> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> Cc: <linux-ext4@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/ext3_fs_sb.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/ext3_fs_sb.h b/include/linux/ext3_fs_sb.h
index e024e38..76fdc0f 100644
--- a/include/linux/ext3_fs_sb.h
+++ b/include/linux/ext3_fs_sb.h
@@ -60,7 +60,7 @@ struct ext3_sb_info {
struct percpu_counter s_freeblocks_counter;
struct percpu_counter s_freeinodes_counter;
struct percpu_counter s_dirs_counter;
- struct blockgroup_lock s_blockgroup_lock;
+ struct blockgroup_lock *s_blockgroup_lock;
/* root of the per fs reservation window tree */
spinlock_t s_rsv_window_lock;
@@ -86,7 +86,7 @@ struct ext3_sb_info {
static inline spinlock_t *
sb_bgl_lock(struct ext3_sb_info *sbi, unsigned int block_group)
{
- return bgl_lock_ptr(&sbi->s_blockgroup_lock, block_group);
+ return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
}
#endif /* _LINUX_EXT3_FS_SB */
OpenPOWER on IntegriCloud