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: linux-mm <linux-mm@kvack.org>
Cc: <linux-fsdevel@vger.kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH 33/47] writeback: trace global dirty page states
Date: Mon, 13 Dec 2010 14:43:22 +0800 [thread overview]
Message-ID: <20101213064841.064409042@intel.com> (raw)
In-Reply-To: 20101213064249.648862451@intel.com
[-- Attachment #1: writeback-trace-global-dirty-states.patch --]
[-- Type: text/plain, Size: 3706 bytes --]
Add trace balance_dirty_state for showing the global dirty page counts
and thresholds at each balance_dirty_pages() loop.
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
include/trace/events/writeback.h | 57 +++++++++++++++++++++++++++++
mm/page-writeback.c | 15 ++++++-
2 files changed, 69 insertions(+), 3 deletions(-)
--- linux-next.orig/mm/page-writeback.c 2010-12-09 12:24:49.000000000 +0800
+++ linux-next/mm/page-writeback.c 2010-12-09 12:24:52.000000000 +0800
@@ -720,12 +720,21 @@ static void balance_dirty_pages(struct a
* written to the server's write cache, but has not yet
* been flushed to permanent storage.
*/
- nr_reclaimable = global_page_state(NR_FILE_DIRTY) +
- global_page_state(NR_UNSTABLE_NFS);
- nr_dirty = nr_reclaimable + global_page_state(NR_WRITEBACK);
+ nr_reclaimable = global_page_state(NR_FILE_DIRTY);
+ bdi_dirty = global_page_state(NR_UNSTABLE_NFS);
+ nr_dirty = global_page_state(NR_WRITEBACK);
global_dirty_limits(&background_thresh, &dirty_thresh);
+ trace_balance_dirty_state(mapping,
+ nr_reclaimable,
+ nr_dirty,
+ bdi_dirty,
+ background_thresh,
+ dirty_thresh);
+ nr_reclaimable += bdi_dirty;
+ nr_dirty += nr_reclaimable;
+
/*
* Throttle it only when the background writeback cannot
* catch-up. This avoids (excessively) small writeouts
--- linux-next.orig/include/trace/events/writeback.h 2010-12-09 12:24:49.000000000 +0800
+++ linux-next/include/trace/events/writeback.h 2010-12-09 12:24:52.000000000 +0800
@@ -149,6 +149,63 @@ DEFINE_WBC_EVENT(wbc_writeback_written);
DEFINE_WBC_EVENT(wbc_writeback_wait);
DEFINE_WBC_EVENT(wbc_writepage);
+TRACE_EVENT(balance_dirty_state,
+
+ TP_PROTO(struct address_space *mapping,
+ unsigned long nr_dirty,
+ unsigned long nr_writeback,
+ unsigned long nr_unstable,
+ unsigned long background_thresh,
+ unsigned long dirty_thresh
+ ),
+
+ TP_ARGS(mapping,
+ nr_dirty,
+ nr_writeback,
+ nr_unstable,
+ background_thresh,
+ dirty_thresh
+ ),
+
+ TP_STRUCT__entry(
+ __array(char, bdi, 32)
+ __field(unsigned long, ino)
+ __field(unsigned long, nr_dirty)
+ __field(unsigned long, nr_writeback)
+ __field(unsigned long, nr_unstable)
+ __field(unsigned long, background_thresh)
+ __field(unsigned long, dirty_thresh)
+ __field(unsigned long, task_dirtied_pause)
+ ),
+
+ TP_fast_assign(
+ strlcpy(__entry->bdi,
+ dev_name(mapping->backing_dev_info->dev), 32);
+ __entry->ino = mapping->host->i_ino;
+ __entry->nr_dirty = nr_dirty;
+ __entry->nr_writeback = nr_writeback;
+ __entry->nr_unstable = nr_unstable;
+ __entry->background_thresh = background_thresh;
+ __entry->dirty_thresh = dirty_thresh;
+ __entry->task_dirtied_pause = current->nr_dirtied_pause;
+ ),
+
+ TP_printk("bdi %s: dirty=%lu wb=%lu unstable=%lu "
+ "bg_thresh=%lu thresh=%lu gap=%ld "
+ "poll_thresh=%lu ino=%lu",
+ __entry->bdi,
+ __entry->nr_dirty,
+ __entry->nr_writeback,
+ __entry->nr_unstable,
+ __entry->background_thresh,
+ __entry->dirty_thresh,
+ __entry->dirty_thresh - __entry->nr_dirty -
+ __entry->nr_writeback - __entry->nr_unstable,
+ __entry->task_dirtied_pause,
+ __entry->ino
+ )
+);
+
#define KBps(x) ((x) << (PAGE_SHIFT - 10))
#define BDP_PERCENT(a, b, c) ((__entry->a - __entry->b) * 100 * c + \
__entry->bdi_limit/2) / (__entry->bdi_limit|1)
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2010-12-13 6:43 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-13 6:42 [PATCH 00/47] IO-less dirty throttling v3 Wu Fengguang
2010-12-13 6:42 ` [PATCH 01/47] writeback: enabling gate limit for light dirtied bdi Wu Fengguang
2010-12-13 6:42 ` [PATCH 02/47] writeback: safety margin for bdi stat error Wu Fengguang
2010-12-13 6:42 ` [PATCH 03/47] writeback: IO-less balance_dirty_pages() Wu Fengguang
2010-12-13 6:42 ` [PATCH 04/47] writeback: consolidate variable names in balance_dirty_pages() Wu Fengguang
2010-12-13 6:42 ` [PATCH 05/47] writeback: per-task rate limit on balance_dirty_pages() Wu Fengguang
2010-12-13 6:42 ` [PATCH 06/47] writeback: prevent duplicate balance_dirty_pages_ratelimited() calls Wu Fengguang
2010-12-13 6:42 ` [PATCH 07/47] writeback: account per-bdi accumulated written pages Wu Fengguang
2010-12-13 6:42 ` [PATCH 08/47] writeback: bdi write bandwidth estimation Wu Fengguang
2010-12-13 6:42 ` [PATCH 09/47] writeback: show bdi write bandwidth in debugfs Wu Fengguang
2010-12-13 6:42 ` [PATCH 10/47] writeback: quit throttling when bdi dirty pages dropped low Wu Fengguang
2010-12-13 6:43 ` [PATCH 11/47] writeback: reduce per-bdi dirty threshold ramp up time Wu Fengguang
2010-12-13 6:43 ` [PATCH 12/47] writeback: make reasonable gap between the dirty/background thresholds Wu Fengguang
2010-12-13 6:43 ` [PATCH 13/47] writeback: scale down max throttle bandwidth on concurrent dirtiers Wu Fengguang
2010-12-13 6:43 ` [PATCH 14/47] writeback: add trace event for balance_dirty_pages() Wu Fengguang
2010-12-13 6:43 ` [PATCH 15/47] writeback: make nr_to_write a per-file limit Wu Fengguang
2010-12-13 6:43 ` [PATCH 16/47] writeback: make-nr_to_write-a-per-file-limit fix Wu Fengguang
2010-12-13 6:43 ` [PATCH 17/47] writeback: do uninterruptible sleep in balance_dirty_pages() Wu Fengguang
2010-12-13 6:43 ` [PATCH 18/47] writeback: move BDI_WRITTEN accounting into __bdi_writeout_inc() Wu Fengguang
2010-12-13 6:43 ` [PATCH 19/47] writeback: fix increasement of nr_dirtied_pause Wu Fengguang
2010-12-13 6:43 ` [PATCH 20/47] writeback: use do_div in bw calculation Wu Fengguang
2010-12-13 6:43 ` [PATCH 21/47] writeback: prevent divide error on tiny HZ Wu Fengguang
2010-12-13 6:43 ` [PATCH 22/47] writeback: prevent bandwidth calculation overflow Wu Fengguang
2010-12-13 6:43 ` [PATCH 23/47] writeback: spinlock protected bdi bandwidth update Wu Fengguang
2010-12-13 6:43 ` [PATCH 24/47] writeback: increase pause time on concurrent dirtiers Wu Fengguang
2010-12-13 6:43 ` [PATCH 25/47] writeback: make it easier to break from a dirty exceeded bdi Wu Fengguang
2010-12-13 6:43 ` [PATCH 26/47] writeback: start background writeback earlier Wu Fengguang
2010-12-13 6:43 ` [PATCH 27/47] writeback: user space think time compensation Wu Fengguang
2010-12-13 6:43 ` [PATCH 28/47] writeback: bdi base throttle bandwidth Wu Fengguang
2010-12-13 6:43 ` [PATCH 29/47] writeback: smoothed bdi dirty pages Wu Fengguang
2010-12-13 6:43 ` [PATCH 30/47] writeback: adapt max balance pause time to memory size Wu Fengguang
2010-12-13 6:43 ` [PATCH 31/47] writeback: increase min pause time on concurrent dirtiers Wu Fengguang
2010-12-13 6:43 ` [PATCH 32/47] writeback: extend balance_dirty_pages() trace event Wu Fengguang
2010-12-13 6:43 ` Wu Fengguang [this message]
2010-12-13 6:43 ` [PATCH 34/47] writeback: trace writeback_single_inode() Wu Fengguang
2010-12-13 6:43 ` [PATCH 35/47] writeback: scale IO chunk size up to device bandwidth Wu Fengguang
2010-12-13 6:43 ` [PATCH 36/47] btrfs: dont call balance_dirty_pages_ratelimited() on already dirty pages Wu Fengguang
2010-12-13 6:43 ` [PATCH 37/47] btrfs: lower the dirty balacing rate limit Wu Fengguang
2010-12-13 6:43 ` [PATCH 38/47] btrfs: wait on too many nr_async_bios Wu Fengguang
2010-12-13 6:43 ` [PATCH 39/47] nfs: livelock prevention is now done in VFS Wu Fengguang
2010-12-13 6:43 ` [PATCH 40/47] nfs: writeback pages wait queue Wu Fengguang
2010-12-13 6:43 ` [PATCH 41/47] nfs: in-commit pages accounting and " Wu Fengguang
2010-12-13 6:43 ` [PATCH 42/47] nfs: heuristics to avoid commit Wu Fengguang
2010-12-13 6:43 ` [PATCH 43/47] nfs: dont change wbc->nr_to_write in write_inode() Wu Fengguang
2010-12-13 6:43 ` [PATCH 44/47] nfs: limit the range of commits Wu Fengguang
2010-12-13 6:43 ` [PATCH 45/47] nfs: adapt congestion threshold to dirty threshold Wu Fengguang
2010-12-13 6:43 ` [PATCH 46/47] nfs: trace nfs_commit_unstable_pages() Wu Fengguang
2010-12-13 6:43 ` [PATCH 47/47] nfs: trace nfs_commit_release() Wu Fengguang
2010-12-13 11:27 ` [PATCH 00/47] IO-less dirty throttling v3 Peter Zijlstra
2010-12-13 11:49 ` Wu Fengguang
2010-12-13 12:38 ` Peter Zijlstra
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20101213064841.064409042@intel.com \
--to=fengguang.wu@intel.com \
--cc=akpm@linux-foundation.org \
--cc=jack@suse.cz \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).