JBD2: jbd2 slab allocation cleanups
JBD2: Replace slab allocations with page allocations
JBD2 allocate memory for committed_data and frozen_data from slab. However
JBD2 should not pass slab pages down to the block layer. Use page allocator
pages instead. This will also prepare JBD for the large blocksize patchset.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index c0f59d1..2cac34a 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -384,7 +384,7 @@
struct buffer_head *bh = jh2bh(jh);
jbd_lock_bh_state(bh);
- jbd2_slab_free(jh->b_committed_data, bh->b_size);
+ jbd2_free(jh->b_committed_data, bh->b_size);
jh->b_committed_data = NULL;
jbd_unlock_bh_state(bh);
}
@@ -801,14 +801,14 @@
* Otherwise, we can just throw away the frozen data now.
*/
if (jh->b_committed_data) {
- jbd2_slab_free(jh->b_committed_data, bh->b_size);
+ jbd2_free(jh->b_committed_data, bh->b_size);
jh->b_committed_data = NULL;
if (jh->b_frozen_data) {
jh->b_committed_data = jh->b_frozen_data;
jh->b_frozen_data = NULL;
}
} else if (jh->b_frozen_data) {
- jbd2_slab_free(jh->b_frozen_data, bh->b_size);
+ jbd2_free(jh->b_frozen_data, bh->b_size);
jh->b_frozen_data = NULL;
}
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index f37324a..2d9ecca 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -84,7 +84,6 @@
static int journal_convert_superblock_v1(journal_t *, journal_superblock_t *);
static void __journal_abort_soft (journal_t *journal, int errno);
-static int jbd2_journal_create_jbd_slab(size_t slab_size);
/*
* Helper function used to manage commit timeouts
@@ -335,10 +334,10 @@
char *tmp;
jbd_unlock_bh_state(bh_in);
- tmp = jbd2_slab_alloc(bh_in->b_size, GFP_NOFS);
+ tmp = jbd2_alloc(bh_in->b_size, GFP_NOFS);
jbd_lock_bh_state(bh_in);
if (jh_in->b_frozen_data) {
- jbd2_slab_free(tmp, bh_in->b_size);
+ jbd2_free(tmp, bh_in->b_size);
goto repeat;
}
@@ -1096,13 +1095,6 @@
}
}
- /*
- * Create a slab for this blocksize
- */
- err = jbd2_journal_create_jbd_slab(be32_to_cpu(sb->s_blocksize));
- if (err)
- return err;
-
/* Let the recovery code check whether it needs to recover any
* data from the journal. */
if (jbd2_journal_recover(journal))
@@ -1636,77 +1628,6 @@
}
/*
- * jbd slab management: create 1k, 2k, 4k, 8k slabs as needed
- * and allocate frozen and commit buffers from these slabs.
- *
- * Reason for doing this is to avoid, SLAB_DEBUG - since it could
- * cause bh to cross page boundary.
- */
-
-#define JBD_MAX_SLABS 5
-#define JBD_SLAB_INDEX(size) (size >> 11)
-
-static struct kmem_cache *jbd_slab[JBD_MAX_SLABS];
-static const char *jbd_slab_names[JBD_MAX_SLABS] = {
- "jbd2_1k", "jbd2_2k", "jbd2_4k", NULL, "jbd2_8k"
-};
-
-static void jbd2_journal_destroy_jbd_slabs(void)
-{
- int i;
-
- for (i = 0; i < JBD_MAX_SLABS; i++) {
- if (jbd_slab[i])
- kmem_cache_destroy(jbd_slab[i]);
- jbd_slab[i] = NULL;
- }
-}
-
-static int jbd2_journal_create_jbd_slab(size_t slab_size)
-{
- int i = JBD_SLAB_INDEX(slab_size);
-
- BUG_ON(i >= JBD_MAX_SLABS);
-
- /*
- * Check if we already have a slab created for this size
- */
- if (jbd_slab[i])
- return 0;
-
- /*
- * Create a slab and force alignment to be same as slabsize -
- * this will make sure that allocations won't cross the page
- * boundary.
- */
- jbd_slab[i] = kmem_cache_create(jbd_slab_names[i],
- slab_size, slab_size, 0, NULL);
- if (!jbd_slab[i]) {
- printk(KERN_EMERG "JBD: no memory for jbd_slab cache\n");
- return -ENOMEM;
- }
- return 0;
-}
-
-void * jbd2_slab_alloc(size_t size, gfp_t flags)
-{
- int idx;
-
- idx = JBD_SLAB_INDEX(size);
- BUG_ON(jbd_slab[idx] == NULL);
- return kmem_cache_alloc(jbd_slab[idx], flags | __GFP_NOFAIL);
-}
-
-void jbd2_slab_free(void *ptr, size_t size)
-{
- int idx;
-
- idx = JBD_SLAB_INDEX(size);
- BUG_ON(jbd_slab[idx] == NULL);
- kmem_cache_free(jbd_slab[idx], ptr);
-}
-
-/*
* Journal_head storage management
*/
static struct kmem_cache *jbd2_journal_head_cache;
@@ -1893,13 +1814,13 @@
printk(KERN_WARNING "%s: freeing "
"b_frozen_data\n",
__FUNCTION__);
- jbd2_slab_free(jh->b_frozen_data, bh->b_size);
+ jbd2_free(jh->b_frozen_data, bh->b_size);
}
if (jh->b_committed_data) {
printk(KERN_WARNING "%s: freeing "
"b_committed_data\n",
__FUNCTION__);
- jbd2_slab_free(jh->b_committed_data, bh->b_size);
+ jbd2_free(jh->b_committed_data, bh->b_size);
}
bh->b_private = NULL;
jh->b_bh = NULL; /* debug, really */
@@ -2040,7 +1961,6 @@
jbd2_journal_destroy_revoke_caches();
jbd2_journal_destroy_jbd2_journal_head_cache();
jbd2_journal_destroy_handle_cache();
- jbd2_journal_destroy_jbd_slabs();
}
static int __init journal_init(void)
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index 7946ff4..bd047f9 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -236,7 +236,7 @@
/* Allocate a new handle. This should probably be in a slab... */
static handle_t *new_handle(int nblocks)
{
- handle_t *handle = jbd_alloc_handle(GFP_NOFS);
+ handle_t *handle = jbd2_alloc_handle(GFP_NOFS);
if (!handle)
return NULL;
memset(handle, 0, sizeof(*handle));
@@ -282,7 +282,7 @@
err = start_this_handle(journal, handle);
if (err < 0) {
- jbd_free_handle(handle);
+ jbd2_free_handle(handle);
current->journal_info = NULL;
handle = ERR_PTR(err);
}
@@ -668,7 +668,7 @@
JBUFFER_TRACE(jh, "allocate memory for buffer");
jbd_unlock_bh_state(bh);
frozen_buffer =
- jbd2_slab_alloc(jh2bh(jh)->b_size,
+ jbd2_alloc(jh2bh(jh)->b_size,
GFP_NOFS);
if (!frozen_buffer) {
printk(KERN_EMERG
@@ -728,7 +728,7 @@
out:
if (unlikely(frozen_buffer)) /* It's usually NULL */
- jbd2_slab_free(frozen_buffer, bh->b_size);
+ jbd2_free(frozen_buffer, bh->b_size);
JBUFFER_TRACE(jh, "exit");
return error;
@@ -881,7 +881,7 @@
repeat:
if (!jh->b_committed_data) {
- committed_data = jbd2_slab_alloc(jh2bh(jh)->b_size, GFP_NOFS);
+ committed_data = jbd2_alloc(jh2bh(jh)->b_size, GFP_NOFS);
if (!committed_data) {
printk(KERN_EMERG "%s: No memory for committed data\n",
__FUNCTION__);
@@ -908,7 +908,7 @@
out:
jbd2_journal_put_journal_head(jh);
if (unlikely(committed_data))
- jbd2_slab_free(committed_data, bh->b_size);
+ jbd2_free(committed_data, bh->b_size);
return err;
}
@@ -1411,7 +1411,7 @@
spin_unlock(&journal->j_state_lock);
}
- jbd_free_handle(handle);
+ jbd2_free_handle(handle);
return err;
}
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index 260d6d7..e367792 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -72,14 +72,22 @@
#endif
extern void * __jbd2_kmalloc (const char *where, size_t size, gfp_t flags, int retry);
-extern void * jbd2_slab_alloc(size_t size, gfp_t flags);
-extern void jbd2_slab_free(void *ptr, size_t size);
-
#define jbd_kmalloc(size, flags) \
__jbd2_kmalloc(__FUNCTION__, (size), (flags), journal_oom_retry)
#define jbd_rep_kmalloc(size, flags) \
__jbd2_kmalloc(__FUNCTION__, (size), (flags), 1)
+
+static inline void *jbd2_alloc(size_t size, gfp_t flags)
+{
+ return (void *)__get_free_pages(flags, get_order(size));
+}
+
+static inline void jbd2_free(void *ptr, size_t size)
+{
+ free_pages((unsigned long)ptr, get_order(size));
+};
+
#define JBD2_MIN_JOURNAL_BLOCKS 1024
#ifdef __KERNEL__
@@ -959,12 +967,12 @@
*/
extern struct kmem_cache *jbd2_handle_cache;
-static inline handle_t *jbd_alloc_handle(gfp_t gfp_flags)
+static inline handle_t *jbd2_alloc_handle(gfp_t gfp_flags)
{
return kmem_cache_alloc(jbd2_handle_cache, gfp_flags);
}
-static inline void jbd_free_handle(handle_t *handle)
+static inline void jbd2_free_handle(handle_t *handle)
{
kmem_cache_free(jbd2_handle_cache, handle);
}