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- Log -----------------------------------------------------------------
commit 23e72c453fcb6b67044d14a778a0b82de95b399c
Author: Jonathan Brassow <jbrassow@redhat.com>
Date: Fri May 16 12:58:00 2008 -0500

dm-log-clustered: Optimization - no need to send get_resync_work if none left

Once recovery has finished, it is never restarted until the mirror is
suspended/resumed. So, we can immediately return 0 on a 'get_resync_work'
call if recovery has finished (rather than sending to userspace, and then
around the cluster). This improves performance.

-----------------------------------------------------------------------

Summary of changes:
cmirror-kernel/src/dm-clog.c | 10 ++++++++++
1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/cmirror-kernel/src/dm-clog.c b/cmirror-kernel/src/dm-clog.c
index b61de62..62ad414 100644
--- a/cmirror-kernel/src/dm-clog.c
+++ b/cmirror-kernel/src/dm-clog.c
@@ -23,6 +23,13 @@ struct log_c {
char *ctr_str; /* Gives ability to restart if userspace dies */
uint32_t ctr_size;

+ /*
+ * in_sync_hint gets set when doing is_remote_recovering. It
+ * represents the first region that needs recovery. IOW, the
+ * first zero bit of sync_bits. This can be useful for to limit
+ * traffic for calls like is_remote_recovering and get_resync_work,
+ * but be take care in its use for anything else.
+ */
uint64_t in_sync_hint;

spinlock_t flush_lock;
@@ -528,6 +535,9 @@ static int cluster_get_resync_work(struct dirty_log *log, region_t *region)
struct log_c *lc = (struct log_c *)log->context;
struct { int i; region_t r; } pkg;

+ if (lc->in_sync_hint >= lc->region_count)
+ return 0;
+
rdata_size = sizeof(pkg);
r = cluster_do_request(lc, lc->uuid, DM_CLOG_GET_RESYNC_WORK,
NULL, 0,


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