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GFS2: Add an AIL writeback tracepoint

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Add a tracepoint for monitoring writeback of the AIL.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Steven Whitehouse 2011-04-18 14:18:38 +01:00
parent 4667a0ec32
commit c83ae9cad8
2 changed files with 30 additions and 0 deletions
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2
fs/gfs2/log.c
View File

@ -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);
}
/**

28
fs/gfs2/trace_gfs2.h
View File

@ -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: