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authorDave Chinner <dchinner@redhat.com>2011-03-11 11:52:25 +0000
committerSteven Whitehouse <swhiteho@redhat.com>2011-03-11 11:52:25 +0000
commitd6a079e82efd5fcbb1c7295f22e123c2cc748018 (patch)
treef95f3369dfb560bfc5d282577ca1edec0487e1d7 /fs/gfs2/glops.c
parente4a7b7b0c98efcdcc4c1f6eb10925dec1fbc4016 (diff)
GFS2: introduce AIL lock
The log lock is currently used to protect the AIL lists and the movements of buffers into and out of them. The lists are self contained and no log specific items outside the lists are accessed when starting or emptying the AIL lists. Hence the operation of the AIL does not require the protection of the log lock so split them out into a new AIL specific lock to reduce the amount of traffic on the log lock. This will also reduce the amount of serialisation that occurs when the gfs2_logd pushes on the AIL to move it forward. This reduces the impact of log pushing on sequential write throughput. Signed-off-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/glops.c')
-rw-r--r--fs/gfs2/glops.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index ac5fac948f87..3754e3cbf02b 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -56,20 +56,26 @@ static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
BUG_ON(current->journal_info);
current->journal_info = &tr;
- gfs2_log_lock(sdp);
+ spin_lock(&sdp->sd_ail_lock);
while (!list_empty(head)) {
bd = list_entry(head->next, struct gfs2_bufdata,
bd_ail_gl_list);
bh = bd->bd_bh;
gfs2_remove_from_ail(bd);
+ spin_unlock(&sdp->sd_ail_lock);
+
bd->bd_bh = NULL;
bh->b_private = NULL;
bd->bd_blkno = bh->b_blocknr;
+ gfs2_log_lock(sdp);
gfs2_assert_withdraw(sdp, !buffer_busy(bh));
gfs2_trans_add_revoke(sdp, bd);
+ gfs2_log_unlock(sdp);
+
+ spin_lock(&sdp->sd_ail_lock);
}
gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
- gfs2_log_unlock(sdp);
+ spin_unlock(&sdp->sd_ail_lock);
gfs2_trans_end(sdp);
gfs2_log_flush(sdp, NULL);