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>

1 files changed, 23 insertions, 0 deletions

diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index e8676accf902..29aee2128edb 100644
--- 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;