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authorBob Peterson <rpeterso@redhat.com>2012-02-14 14:49:57 -0500
committerSteven Whitehouse <swhiteho@redhat.com>2012-02-28 17:10:53 +0000
commit4a36d08d0d1cba0581d1656739102ce936f26557 (patch)
tree9cff2e9a41944f3b76507711d295fe2bd5f0f1d8 /fs/gfs2
parent66fc061bda3526650328b73f69985da3518c4256 (diff)
downloadop-kernel-dev-4a36d08d0d1cba0581d1656739102ce936f26557.zip
op-kernel-dev-4a36d08d0d1cba0581d1656739102ce936f26557.tar.gz
GFS2: Sort the ordered write list
This patch sorts the ordered write list for GFS2 writes. This increases the throughput for simultaneous writes. For example, if you have ten processes, all doing: dd if=/dev/zero of=/mnt/gfs2/fileX on different files, the throughput will be much better. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2')
-rw-r--r--fs/gfs2/log.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 4d31379..b8fe7b7 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -19,6 +19,7 @@
#include <linux/freezer.h>
#include <linux/bio.h>
#include <linux/writeback.h>
+#include <linux/list_sort.h>
#include "gfs2.h"
#include "incore.h"
@@ -566,6 +567,20 @@ static void log_flush_commit(struct gfs2_sbd *sdp)
log_write_header(sdp, 0, 0);
}
+int bd_cmp(void *priv, struct list_head *a, struct list_head *b)
+{
+ struct gfs2_bufdata *bda, *bdb;
+
+ bda = list_entry(a, struct gfs2_bufdata, bd_le.le_list);
+ bdb = list_entry(b, struct gfs2_bufdata, bd_le.le_list);
+
+ if (bda->bd_bh->b_blocknr < bdb->bd_bh->b_blocknr)
+ return -1;
+ if (bda->bd_bh->b_blocknr > bdb->bd_bh->b_blocknr)
+ return 1;
+ return 0;
+}
+
static void gfs2_ordered_write(struct gfs2_sbd *sdp)
{
struct gfs2_bufdata *bd;
@@ -573,6 +588,7 @@ static void gfs2_ordered_write(struct gfs2_sbd *sdp)
LIST_HEAD(written);
gfs2_log_lock(sdp);
+ list_sort(NULL, &sdp->sd_log_le_ordered, &bd_cmp);
while (!list_empty(&sdp->sd_log_le_ordered)) {
bd = list_entry(sdp->sd_log_le_ordered.next, struct gfs2_bufdata, bd_le.le_list);
list_move(&bd->bd_le.le_list, &written);
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