merge

1 files changed, 17 insertions, 5 deletions

diff --git a/storage/innobase/srv/srv0srv.c b/storage/innobase/srv/srv0srv.c
index dcfd5463fbc..3e10aa03096 100644
--- a/storage/innobase/srv/srv0srv.c
+++ b/storage/innobase/srv/srv0srv.c
@@ -1,6 +1,6 @@
 /*****************************************************************************
 
-Copyright (c) 1995, 2010, Innobase Oy. All Rights Reserved.
+Copyright (c) 1995, 2011, Oracle and/or its affiliates. All Rights Reserved.
 Copyright (c) 2008, 2009 Google Inc.
 Copyright (c) 2009, Percona Inc.
 
@@ -269,9 +269,12 @@ UNIV_INTERN ulong	srv_max_buf_pool_modified_pct	= 75;
 /* the number of purge threads to use from the worker pool (currently 0 or 1).*/
 UNIV_INTERN ulong srv_n_purge_threads = 0;
 
-/* the number of records to purge in one batch */
+/* the number of pages to purge in one batch */
 UNIV_INTERN ulong srv_purge_batch_size = 20;
 
+/* the number of rollback segments to use */
+UNIV_INTERN ulong srv_rollback_segments = TRX_SYS_N_RSEGS;
+
 /* variable counts amount of data read in total (in bytes) */
 UNIV_INTERN ulint srv_data_read = 0;
 
@@ -3096,6 +3099,7 @@ srv_purge_thread(
 						required by os_thread_create */
 {
 	srv_slot_t*	slot;
+	ulint		retries = 0;
 	ulint		slot_no = ULINT_UNDEFINED;
 	ulint		n_total_purged = ULINT_UNDEFINED;
 
@@ -3122,7 +3126,7 @@ srv_purge_thread(
 
 	while (srv_shutdown_state != SRV_SHUTDOWN_EXIT_THREADS) {
 
-		ulint	n_pages_purged;
+		ulint	n_pages_purged = 0;
 
 		/* If there are very few records to purge or the last
 		purge didn't purge any records then wait for activity.
@@ -3130,7 +3134,8 @@ srv_purge_thread(
 		because in the worst case we will end up waiting for
 		the next purge event. */
 		if (trx_sys->rseg_history_len < srv_purge_batch_size
-		    || n_total_purged == 0) {
+		    || (n_total_purged == 0
+			&& retries >= TRX_SYS_N_RSEGS)) {
 
 			os_event_t	event;
 
@@ -3141,6 +3146,8 @@ srv_purge_thread(
 			mutex_exit(&kernel_mutex);
 
 			os_event_wait(event);
+
+			retries = 0;
 		}
 
 		/* Check for shutdown and whether we should do purge at all. */
@@ -3151,7 +3158,12 @@ srv_purge_thread(
 			break;
 		}
 
-		n_total_purged = 0;
+		if (n_total_purged == 0 && retries <= TRX_SYS_N_RSEGS) {
+			++retries;
+		} else if (n_total_purged > 0) {
+			retries = 0;
+			n_total_purged = 0;
+		}
 
 		/* Purge until there are no more records to purge and there is
 		no change in configuration or server state. */