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authorWu Fengguang <fengguang.wu@intel.com>2011-03-02 17:22:49 -0600
committerWu Fengguang <fengguang.wu@intel.com>2011-10-31 00:29:21 +0800
commitb48c104d2211b0ac881a71f5f76a3816225f8111 (patch)
treeb947f3fd4c8b49ee12d516f3eb520209c577387b /include/trace
parent50657fc4dfa7e345a1008f7c1de0bf930bbecca9 (diff)
downloadlinux-linaro-stable-b48c104d2211b0ac881a71f5f76a3816225f8111.tar.gz
writeback: trace event bdi_dirty_ratelimit
It helps understand how various throttle bandwidths are updated. Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Diffstat (limited to 'include/trace')
-rw-r--r--include/trace/events/writeback.h45
1 files changed, 45 insertions, 0 deletions
diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h
index 178c23508d3d..ffb5deb77ca9 100644
--- a/include/trace/events/writeback.h
+++ b/include/trace/events/writeback.h
@@ -226,6 +226,51 @@ TRACE_EVENT(global_dirty_state,
)
);
+#define KBps(x) ((x) << (PAGE_SHIFT - 10))
+
+TRACE_EVENT(bdi_dirty_ratelimit,
+
+ TP_PROTO(struct backing_dev_info *bdi,
+ unsigned long dirty_rate,
+ unsigned long task_ratelimit),
+
+ TP_ARGS(bdi, dirty_rate, task_ratelimit),
+
+ TP_STRUCT__entry(
+ __array(char, bdi, 32)
+ __field(unsigned long, write_bw)
+ __field(unsigned long, avg_write_bw)
+ __field(unsigned long, dirty_rate)
+ __field(unsigned long, dirty_ratelimit)
+ __field(unsigned long, task_ratelimit)
+ __field(unsigned long, balanced_dirty_ratelimit)
+ ),
+
+ TP_fast_assign(
+ strlcpy(__entry->bdi, dev_name(bdi->dev), 32);
+ __entry->write_bw = KBps(bdi->write_bandwidth);
+ __entry->avg_write_bw = KBps(bdi->avg_write_bandwidth);
+ __entry->dirty_rate = KBps(dirty_rate);
+ __entry->dirty_ratelimit = KBps(bdi->dirty_ratelimit);
+ __entry->task_ratelimit = KBps(task_ratelimit);
+ __entry->balanced_dirty_ratelimit =
+ KBps(bdi->balanced_dirty_ratelimit);
+ ),
+
+ TP_printk("bdi %s: "
+ "write_bw=%lu awrite_bw=%lu dirty_rate=%lu "
+ "dirty_ratelimit=%lu task_ratelimit=%lu "
+ "balanced_dirty_ratelimit=%lu",
+ __entry->bdi,
+ __entry->write_bw, /* write bandwidth */
+ __entry->avg_write_bw, /* avg write bandwidth */
+ __entry->dirty_rate, /* bdi dirty rate */
+ __entry->dirty_ratelimit, /* base ratelimit */
+ __entry->task_ratelimit, /* ratelimit with position control */
+ __entry->balanced_dirty_ratelimit /* the balanced ratelimit */
+ )
+);
+
DECLARE_EVENT_CLASS(writeback_congest_waited_template,
TP_PROTO(unsigned int usec_timeout, unsigned int usec_delayed),