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Date: Wed, 24 Mar 2010 21:32:39 +0800
From: jing zhang <zj.barak@...il.com>
To: linux-ext4 <linux-ext4@...r.kernel.org>
Cc: "Theodore Ts'o" <tytso@....edu>, Andreas Dilger <adilger@....com>,
Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
Subject: [PATCH] ext4: try fast merge operation in ext4_mb_free_metadata()
From: Jing Zhang <zj.barak@...il.com>
Date: Wed Mar 24 21:30:22 2010
There may exist fast path for merge if merge-able.
Cc: Theodore Ts'o <tytso@....edu>
Cc: Andreas Dilger <adilger@....com>
Cc: Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
Signed-off-by: Jing Zhang <zj.barak@...il.com>
---
--- linux-2.6.32/fs/ext4/mballoc.c 2009-12-03 11:51:22.000000000 +0800
+++ ext4_mm_leak/mballoc7.c 2010-03-24 21:27:24.000000000 +0800
@@ -4385,6 +4385,24 @@ ext4_mb_free_metadata(handle_t *handle,
}
}
+ if (parent) {
+ /* let's try fast path */
+ entry = rb_entry(parent, struct ext4_free_data, node);
+ if (n == &parent->rb_left) {
+ if (can_merge(new_entry, entry)) {
+ entry->start_blk = new_entry->start_blk;
+ entry->count += new_entry->count;
+ /* and info the caller that new_entry is
+ * not used yet.
+ */
+ return 0;
+ }
+ }
+ else if (can_merge(entry, new_entry)) {
+ entry->count += new_entry->count;
+ return 0;
+ }
+ }
rb_link_node(new_node, parent, n);
rb_insert_color(new_node, &db->bb_free_root);
--
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