buf0buf.c, srv0srv.h, buf0buf.h, srv0srv.c:

Clean up the working of the main thread; add a tunable parameter srv_max_buf_pool_modified_pct which can be used to make the flush phase in shutdown quicker


innobase/srv/srv0srv.c:
  Clean up the working of the main thread; add a tunable parameter srv_max_buf_pool_modified_pct which can be used to make the flush phase in shutdown quicker
innobase/include/buf0buf.h:
  Clean up the working of the main thread; add a tunable parameter srv_max_buf_pool_modified_pct which can be used to make the flush phase in shutdown quicker
innobase/include/srv0srv.h:
  Clean up the working of the main thread; add a tunable parameter srv_max_buf_pool_modified_pct which can be used to make the flush phase in shutdown quicker
innobase/buf/buf0buf.c:
  Clean up the working of the main thread; add a tunable parameter srv_max_buf_pool_modified_pct which can be used to make the flush phase in shutdown quicker

innobase/buf/buf0buf.c

@@ -1832,6 +1832,28 @@ buf_get_n_pending_ios(void)
 		+ buf_pool->n_flush[BUF_FLUSH_SINGLE_PAGE]);
 }
 
+/*************************************************************************
+Returns the ratio in percents of modified pages in the buffer pool /
+database pages in the buffer pool. */
+
+ulint
+buf_get_modified_ratio_pct(void)
+/*============================*/
+{
+	ulint	ratio;
+
+	mutex_enter(&(buf_pool->mutex));
+
+	ratio = (100 * UT_LIST_GET_LEN(buf_pool->flush_list))
+		     / (1 + UT_LIST_GET_LEN(buf_pool->LRU));
+
+		       /* 1 + is there to avoid division by zero */   
+
+	mutex_exit(&(buf_pool->mutex));
+
+	return(ratio);
+}
+
 /*************************************************************************
 Prints info of the buffer i/o. */