From: Wu Fengguang <fengguang.wu@intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Jan Kara <jack@suse.cz>, Wu Fengguang <fengguang.wu@intel.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Rik van Riel <riel@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Andrea Righi <arighi@develer.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: linux-mm <linux-mm@kvack.org>
Cc: <linux-fsdevel@vger.kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH 22/27] writeback: trace dirty_throttle_bandwidth
Date: Thu, 03 Mar 2011 14:45:27 +0800 [thread overview]
Message-ID: <20110303074951.568969627@intel.com> (raw)
In-Reply-To: 20110303064505.718671603@intel.com
[-- Attachment #1: writeback-trace-throttle-bandwidth.patch --]
[-- Type: text/plain, Size: 3004 bytes --]
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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next prev parent reply other threads:[~2011-03-03 6:45 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-03 6:45 [PATCH 00/27] IO-less dirty throttling v6 Wu Fengguang
2011-03-03 6:45 ` [PATCH 01/27] writeback: add bdi_dirty_limit() kernel-doc Wu Fengguang
2011-03-03 6:45 ` [PATCH 02/27] writeback: avoid duplicate balance_dirty_pages_ratelimited() calls Wu Fengguang
2011-03-03 6:45 ` [PATCH 03/27] writeback: skip balance_dirty_pages() for in-memory fs Wu Fengguang
2011-03-03 6:45 ` [PATCH 04/27] writeback: reduce per-bdi dirty threshold ramp up time Wu Fengguang
2011-03-03 6:45 ` [PATCH 05/27] btrfs: avoid duplicate balance_dirty_pages_ratelimited() calls Wu Fengguang
2011-03-03 6:45 ` [PATCH 06/27] btrfs: lower the dirty balance poll interval Wu Fengguang
2011-03-04 6:22 ` Dave Chinner
2011-03-04 7:57 ` Wu Fengguang
2011-03-03 6:45 ` [PATCH 07/27] btrfs: wait on too many nr_async_bios Wu Fengguang
2011-03-03 6:45 ` [PATCH 08/27] nfs: dirty livelock prevention is now done in VFS Wu Fengguang
2011-03-03 6:45 ` [PATCH 09/27] nfs: writeback pages wait queue Wu Fengguang
2011-03-03 16:07 ` Peter Zijlstra
2011-03-04 1:53 ` Wu Fengguang
2011-03-03 16:08 ` Peter Zijlstra
2011-03-04 2:01 ` Wu Fengguang
2011-03-04 9:10 ` Peter Zijlstra
2011-03-04 9:26 ` Peter Zijlstra
2011-03-04 14:38 ` Wu Fengguang
2011-03-04 14:41 ` Peter Zijlstra
2011-03-03 6:45 ` [PATCH 10/27] nfs: limit the commit size to reduce fluctuations Wu Fengguang
2011-03-03 6:45 ` [PATCH 11/27] nfs: limit the commit range Wu Fengguang
2011-03-03 6:45 ` [PATCH 12/27] nfs: lower writeback threshold proportionally to dirty threshold Wu Fengguang
2011-03-03 6:45 ` [PATCH 13/27] writeback: account per-bdi accumulated written pages Wu Fengguang
2011-03-03 6:45 ` [PATCH 14/27] writeback: account per-bdi accumulated dirtied pages Wu Fengguang
2011-03-03 6:45 ` [PATCH 15/27] writeback: bdi write bandwidth estimation Wu Fengguang
2011-03-03 6:45 ` [PATCH 16/27] writeback: smoothed global/bdi dirty pages Wu Fengguang
2011-03-03 6:45 ` [PATCH 17/27] writeback: smoothed dirty threshold and limit Wu Fengguang
2011-03-03 6:45 ` [PATCH 18/27] writeback: enforce 1/4 gap between the dirty/background thresholds Wu Fengguang
2011-03-03 6:45 ` [PATCH 19/27] writeback: dirty throttle bandwidth control Wu Fengguang
2011-03-07 21:34 ` Wu Fengguang
2011-03-29 21:08 ` Wu Fengguang
2011-03-03 6:45 ` [PATCH 20/27] writeback: IO-less balance_dirty_pages() Wu Fengguang
2011-03-03 6:45 ` [PATCH 21/27] writeback: show bdi write bandwidth in debugfs Wu Fengguang
2011-03-03 6:45 ` Wu Fengguang [this message]
2011-03-03 6:45 ` [PATCH 23/27] writeback: trace balance_dirty_pages Wu Fengguang
2011-03-03 6:45 ` [PATCH 24/27] writeback: trace global_dirty_state Wu Fengguang
2011-03-03 6:45 ` [PATCH 25/27] writeback: make nr_to_write a per-file limit Wu Fengguang
2011-03-03 6:45 ` [PATCH 26/27] writeback: scale IO chunk size up to device bandwidth Wu Fengguang
2011-03-03 6:45 ` [PATCH 27/27] writeback: trace writeback_single_inode Wu Fengguang
2011-03-03 20:12 ` [PATCH 00/27] IO-less dirty throttling v6 Vivek Goyal
2011-03-03 20:48 ` Vivek Goyal
2011-03-04 9:06 ` Wu Fengguang
2011-04-04 18:12 ` async write IO controllers Wu Fengguang
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