From 4a36d08d0d1cba0581d1656739102ce936f26557 Mon Sep 17 00:00:00 2001 From: Bob Peterson Date: Tue, 14 Feb 2012 14:49:57 -0500 Subject: [PATCH] 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 Signed-off-by: Steven Whitehouse --- fs/gfs2/log.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c index 4d31379265cb..b8fe7b739c27 100644 --- a/fs/gfs2/log.c +++ b/fs/gfs2/log.c @@ -19,6 +19,7 @@ #include #include #include +#include #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); -- 2.34.1