ocfs2/cluster: Show per region heartbeat elapsed time

This patch adds a per region debugfs file that shows the elapsed time
since the time the o2hb timer was last armed.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>

diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index e8676accf9022dbd85f75c6f77ea1e500979e872..29aee2128edb7ef37aba05dc7b323e90e9dd0138 100644 (file)
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -81,6 +81,7 @@ static unsigned long o2hb_failed_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)];
 #define O2HB_DB_TYPE_FAILEDREGIONS     3
 #define O2HB_DB_TYPE_REGION_LIVENODES  4
 #define O2HB_DB_TYPE_REGION_NUMBER     5
+#define O2HB_DB_TYPE_REGION_ELAPSED_TIME       6
 struct o2hb_debug_buf {
        int db_type;
        int db_size;
@@ -99,6 +100,7 @@ static struct o2hb_debug_buf *o2hb_db_failedregions;
 #define O2HB_DEBUG_QUORUMREGIONS       "quorum_regions"
 #define O2HB_DEBUG_FAILEDREGIONS       "failed_regions"
 #define O2HB_DEBUG_REGION_NUMBER       "num"
+#define O2HB_DEBUG_REGION_ELAPSED_TIME "elapsed_time_in_ms"
 
 static struct dentry *o2hb_debug_dir;
 static struct dentry *o2hb_debug_livenodes;
@@ -209,8 +211,10 @@ struct o2hb_region {
        struct dentry           *hr_debug_dir;
        struct dentry           *hr_debug_livenodes;
        struct dentry           *hr_debug_regnum;
+       struct dentry           *hr_debug_elapsed_time;
        struct o2hb_debug_buf   *hr_db_livenodes;
        struct o2hb_debug_buf   *hr_db_regnum;
+       struct o2hb_debug_buf   *hr_db_elapsed_time;
 
        /* let the person setting up hb wait for it to return until it
         * has reached a 'steady' state.  This will be fixed when we have
@@ -1132,6 +1136,13 @@ static int o2hb_debug_open(struct inode *inode, struct file *file)
                                reg->hr_region_num);
                goto done;
 
+       case O2HB_DB_TYPE_REGION_ELAPSED_TIME:
+               reg = (struct o2hb_region *)db->db_data;
+               out += snprintf(buf + out, PAGE_SIZE - out, "%u\n",
+                               jiffies_to_msecs(jiffies -
+                                                reg->hr_last_timeout_start));
+               goto done;
+
        default:
                goto done;
        }
@@ -1925,6 +1936,18 @@ static int o2hb_debug_region_init(struct o2hb_region *reg, struct dentry *dir)
                goto bail;
        }
 
+       reg->hr_debug_elapsed_time =
+                       o2hb_debug_create(O2HB_DEBUG_REGION_ELAPSED_TIME,
+                                         reg->hr_debug_dir,
+                                         &(reg->hr_db_elapsed_time),
+                                         sizeof(*(reg->hr_db_elapsed_time)),
+                                         O2HB_DB_TYPE_REGION_ELAPSED_TIME,
+                                         0, 0, reg);
+       if (!reg->hr_debug_elapsed_time) {
+               mlog_errno(ret);
+               goto bail;
+       }
+
        ret = 0;
 bail:
        return ret;