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| author | Christoph Lameter <clameter@sgi.com> | 2008-02-04 22:28:36 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-05 09:44:14 -0800 |
| commit | b98938c373117043598002f197200d7ed08acd49 (patch) | |
| tree | da9356af43085db78cafec82505c3341d6291201 | |
| parent | aec2c3ed01ed54d0cdf7f6b7c4be217c045ac5ea (diff) | |
| download | lwn-b98938c373117043598002f197200d7ed08acd49.tar.gz lwn-b98938c373117043598002f197200d7ed08acd49.zip | |
bufferhead: revert constructor removal
The constructor for buffer_head slabs was removed recently. We need the
constructor back in slab defrag in order to insure that slab objects always
have a definite state even before we allocated them.
I think we mistakenly merged the removal of the constuctor into a cleanup
patch. You (ie: akpm) had a test that showed that the removal of the
constructor led to a small regression. The prior state makes things easier
for slab defrag.
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/buffer.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/fs/buffer.c b/fs/buffer.c index 1de921484eac..826baf4f04bc 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -3153,7 +3153,7 @@ static void recalc_bh_state(void) struct buffer_head *alloc_buffer_head(gfp_t gfp_flags) { - struct buffer_head *ret = kmem_cache_zalloc(bh_cachep, + struct buffer_head *ret = kmem_cache_alloc(bh_cachep, set_migrateflags(gfp_flags, __GFP_RECLAIMABLE)); if (ret) { INIT_LIST_HEAD(&ret->b_assoc_buffers); @@ -3241,12 +3241,24 @@ int bh_submit_read(struct buffer_head *bh) } EXPORT_SYMBOL(bh_submit_read); +static void +init_buffer_head(struct kmem_cache *cachep, void *data) +{ + struct buffer_head *bh = data; + + memset(bh, 0, sizeof(*bh)); + INIT_LIST_HEAD(&bh->b_assoc_buffers); +} + void __init buffer_init(void) { int nrpages; - bh_cachep = KMEM_CACHE(buffer_head, - SLAB_RECLAIM_ACCOUNT|SLAB_PANIC|SLAB_MEM_SPREAD); + bh_cachep = kmem_cache_create("buffer_head", + sizeof(struct buffer_head), 0, + (SLAB_RECLAIM_ACCOUNT|SLAB_PANIC| + SLAB_MEM_SPREAD), + init_buffer_head); /* * Limit the bh occupancy to 10% of ZONE_NORMAL |