[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>
> ---
>  fs/ocfs2/journal.c |    2 ++
>  fs/ocfs2/ocfs2.h   |    4 +++-
>  fs/ocfs2/super.c   |    7 +++++++
>  3 files changed, 12 insertions(+), 1 deletions(-)
>
> diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
> index cee42ed..81b5885 100644
> --- a/fs/ocfs2/journal.c
> +++ b/fs/ocfs2/journal.c
> @@ -1907,6 +1907,8 @@ void ocfs2_queue_delayed_orphan_scan(struct ocfs2_super *osb)
>  	 * number and update LVB so other node will skip the scan for a while
>  	 */
>  	seqno++;
> +	ds->ds_count++;
> +	ds->ds_scantime = CURRENT_TIME;
>  unlock:
>  	ocfs2_orphan_scan_unlock(osb, seqno, level);
>  out:
> diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
> index 7dc23de..4eea45e 100644
> --- a/fs/ocfs2/ocfs2.h
> +++ b/fs/ocfs2/ocfs2.h
> @@ -156,7 +156,9 @@ struct ocfs2_delayed_orphan_scan {
>  	struct ocfs2_super 	*ds_osb;
>  	struct ocfs2_lock_res 	ds_lockres;     /* lock to synchronize scans */
>  	struct delayed_work 	ds_delayed_orphan_scan_work;
> -	u64  			ds_seqno;       /* incremented on every scan */
> +	struct timespec		ds_scantime;  /* time this node ran the scan */
> +	u64 			ds_count;      /* tracks node specific scans */
> +	u64  			ds_seqno;       /* tracks cluster wide scans */
>   

u32 should be enough.

>  };
>  
>  struct ocfs2_dlm_debug {
> diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
> index 06e139e..d2320a0 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_delayed_orphan_scan *ds;
>  
>  	out += snprintf(buf + out, len - out,
>  			"%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
> @@ -309,6 +310,12 @@ static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
>  				i, osb->slot_recovery_generations[i]);
>  	}
>  
> +	ds = &osb->osb_delayed_scan;
> +	out += snprintf(buf + out, len - out, "Orphan Scan=> ");
> +	out += snprintf(buf + out, len - out, "Local: %llu  Global: %llu ",
> +		       ds->ds_count, ds->ds_seqno);
> +	out += snprintf(buf + out, len - out, " Last Scan: %lu seconds ago\n",
> +			(get_seconds() - ds->ds_scantime.tv_sec));
>  	return out;
>  }
>  
>