[Ocfs2-devel] [PATCH 2/2] ocfs2 patch to track delayed orphan scan timer statistics

[Sunil Mushran <sunil.mushran@oracle.com>]

Srinivas Eeda wrote:
> Patch to track delayed orphan scan timer statistics.
>
> Modifies ocfs2_osb_dump to print the following:
>   Orphan Scan=> Local: 10  Global: 21  Last Scan: 67 seconds ago
>
> Signed-off-by: Srinivas Eeda <srinivas.eeda@oracle.com>
>   

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


> ---
>  fs/ocfs2/journal.c |    2 ++
>  fs/ocfs2/ocfs2.h   |    4 +++-
>  fs/ocfs2/super.c   |    8 ++++++++
>  3 files changed, 13 insertions(+), 1 deletions(-)
>
> diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
> index 63b54b7..6178f6d 100644
> --- a/fs/ocfs2/journal.c
> +++ b/fs/ocfs2/journal.c
> @@ -1899,6 +1899,8 @@ void ocfs2_queue_orphan_scan(struct ocfs2_super *osb)
>  	 * number and update LVB so other node will skip the scan for a while
>  	 */
>  	seqno++;
> +	os->os_count++;
> +	os->os_scantime = CURRENT_TIME;
>  unlock:
>  	ocfs2_orphan_scan_unlock(osb, seqno, DLM_LOCK_EX);
>  out:
> diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
> index 373fb1c..3355b1a 100644
> --- a/fs/ocfs2/ocfs2.h
> +++ b/fs/ocfs2/ocfs2.h
> @@ -156,7 +156,9 @@ struct ocfs2_orphan_scan {
>  	struct ocfs2_super 	*os_osb;
>  	struct ocfs2_lock_res 	os_lockres;     /* lock to synchronize scans */
>  	struct delayed_work 	os_orphan_scan_work;
> -	u32  			os_seqno;       /* incremented on every scan */
> +	struct timespec		os_scantime;  /* time this node ran the scan */
> +	u32			os_count;      /* tracks node specific scans */
> +	u32  			os_seqno;       /* tracks cluster wide scans */
>  };
>  
>  struct ocfs2_dlm_debug {
> diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
> index 44ac27e..d05f3ca 100644
> --- a/fs/ocfs2/super.c
> +++ b/fs/ocfs2/super.c
> @@ -208,6 +208,7 @@ static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
>  	int i;
>  	struct ocfs2_cluster_connection *cconn = osb->cconn;
>  	struct ocfs2_recovery_map *rm = osb->recovery_map;
> +	struct ocfs2_orphan_scan *os;
>  
>  	out += snprintf(buf + out, len - out,
>  			"%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
> @@ -309,6 +310,13 @@ static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
>  				i, osb->slot_recovery_generations[i]);
>  	}
>  
> +	os = &osb->osb_orphan_scan;
> +	out += snprintf(buf + out, len - out, "Orphan Scan=> ");
> +	out += snprintf(buf + out, len - out, "Local: %u  Global: %u ",
> +			os->os_count, os->os_seqno);
> +	out += snprintf(buf + out, len - out, " Last Scan: %lu seconds ago\n",
> +			(get_seconds() - os->os_scantime.tv_sec));
> +
>  	return out;
>  }
>  
>