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Subject[PATCH 22/27] writeback: trace dirty_throttle_bandwidth
It provides critical information to understand how various throttle
bandwidths are updated.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
include/trace/events/writeback.h | 49 +++++++++++++++++++++++++++++
mm/page-writeback.c | 1
2 files changed, 50 insertions(+)

--- linux-next.orig/mm/page-writeback.c 2011-03-03 14:44:31.000000000 +0800
+++ linux-next/mm/page-writeback.c 2011-03-03 14:44:38.000000000 +0800
@@ -1068,6 +1068,7 @@ adjust:
bdi->throttle_bandwidth = bw;
out:
bdi_update_reference_bandwidth(bdi, ref_bw);
+ trace_dirty_throttle_bandwidth(bdi, dirty_bw, pos_bw, ref_bw);
}

void bdi_update_bandwidth(struct backing_dev_info *bdi,
--- linux-next.orig/include/trace/events/writeback.h 2011-03-03 14:43:49.000000000 +0800
+++ linux-next/include/trace/events/writeback.h 2011-03-03 14:44:38.000000000 +0800
@@ -152,6 +152,55 @@ DEFINE_WBC_EVENT(wbc_balance_dirty_writt
DEFINE_WBC_EVENT(wbc_balance_dirty_wait);
DEFINE_WBC_EVENT(wbc_writepage);

+#define KBps(x) ((x) << (PAGE_SHIFT - 10))
+#define Bps(x) ((x) >> (BASE_BW_SHIFT - PAGE_SHIFT))
+
+TRACE_EVENT(dirty_throttle_bandwidth,
+
+ TP_PROTO(struct backing_dev_info *bdi,
+ unsigned long dirty_bw,
+ unsigned long long pos_bw,
+ unsigned long long ref_bw),
+
+ TP_ARGS(bdi, dirty_bw, pos_bw, ref_bw),
+
+ TP_STRUCT__entry(
+ __array(char, bdi, 32)
+ __field(unsigned long, write_bw)
+ __field(unsigned long, avg_bw)
+ __field(unsigned long, dirty_bw)
+ __field(unsigned long long, base_bw)
+ __field(unsigned long long, pos_bw)
+ __field(unsigned long long, ref_bw)
+ __field(unsigned long long, avg_ref_bw)
+ ),
+
+ TP_fast_assign(
+ strlcpy(__entry->bdi, dev_name(bdi->dev), 32);
+ __entry->write_bw = KBps(bdi->write_bandwidth);
+ __entry->avg_bw = KBps(bdi->avg_bandwidth);
+ __entry->dirty_bw = KBps(dirty_bw);
+ __entry->base_bw = Bps(bdi->throttle_bandwidth);
+ __entry->pos_bw = Bps(pos_bw);
+ __entry->ref_bw = Bps(ref_bw);
+ __entry->avg_ref_bw = Bps(bdi->reference_bandwidth);
+ ),
+
+
+ TP_printk("bdi %s: "
+ "write_bw=%lu avg_bw=%lu dirty_bw=%lu "
+ "base_bw=%llu pos_bw=%llu ref_bw=%llu aref_bw=%llu",
+ __entry->bdi,
+ __entry->write_bw, /* bdi write bandwidth */
+ __entry->avg_bw, /* bdi avg write bandwidth */
+ __entry->dirty_bw, /* bdi dirty bandwidth */
+ __entry->base_bw, /* base throttle bandwidth */
+ __entry->pos_bw, /* position control bandwidth */
+ __entry->ref_bw, /* reference throttle bandwidth */
+ __entry->avg_ref_bw /* smoothed reference bandwidth */
+ )
+);
+
DECLARE_EVENT_CLASS(writeback_congest_waited_template,

TP_PROTO(unsigned int usec_timeout, unsigned int usec_delayed),



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