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Commit c83ae9ca authored by Steven Whitehouse's avatar Steven Whitehouse
Browse files

GFS2: Add an AIL writeback tracepoint 



Add a tracepoint for monitoring writeback of the AIL.

Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
parent 4667a0ec

fs/gfs2/log.c

+2 −0
Original line number Diff line number Diff line
@@ -144,6 +144,7 @@ void gfs2_ail1_flush(struct gfs2_sbd *sdp, struct writeback_control *wbc) 
	struct list_head *head = &sdp->sd_ail1_list;

	struct gfs2_ail *ai;



	trace_gfs2_ail_flush(sdp, wbc, 1);

	spin_lock(&sdp->sd_ail_lock);

	list_for_each_entry_reverse(ai, head, ai_list) {

		if (wbc->nr_to_write <= 0)
@@ -151,6 +152,7 @@ void gfs2_ail1_flush(struct gfs2_sbd *sdp, struct writeback_control *wbc) 
		gfs2_ail1_start_one(sdp, wbc, ai); /* This may drop ail lock */

	}

	spin_unlock(&sdp->sd_ail_lock);

	trace_gfs2_ail_flush(sdp, wbc, 0);

}



/**

fs/gfs2/trace_gfs2.h

+28 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
#include <linux/buffer_head.h>

#include <linux/dlmconstants.h>

#include <linux/gfs2_ondisk.h>

#include <linux/writeback.h>

#include "incore.h"

#include "glock.h"
@@ -320,6 +321,33 @@ TRACE_EVENT(gfs2_log_blocks, 
		  MINOR(__entry->dev), __entry->blocks)

);



/* Writing back the AIL */

TRACE_EVENT(gfs2_ail_flush,



	TP_PROTO(const struct gfs2_sbd *sdp, const struct writeback_control *wbc, int start),



	TP_ARGS(sdp, wbc, start),



	TP_STRUCT__entry(

		__field(	dev_t,	dev			)

		__field(	int, start			)

		__field(	int, sync_mode			)

		__field(	long, nr_to_write		)

	),



	TP_fast_assign(

		__entry->dev		= sdp->sd_vfs->s_dev;

		__entry->start		= start;

		__entry->sync_mode	= wbc->sync_mode;

		__entry->nr_to_write	= wbc->nr_to_write;

	),



	TP_printk("%u,%u ail flush %s %s %ld", MAJOR(__entry->dev),

		  MINOR(__entry->dev), __entry->start ? "start" : "end",

		  __entry->sync_mode == WB_SYNC_ALL ? "all" : "none",

		  __entry->nr_to_write)

);



/* Section 3 - bmap

 *

 * Objectives: