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SubjectRe: [PATCH 6/6] writeback: refill b_io iff empty
To help understand the behavior change, I wrote the writeback_queue_io
trace event, and found very different patterns between
- vanilla kernel
- this patchset plus the sync livelock fixes

Basically the vanilla kernel each time pulls a random number of inodes
from b_dirty, while the patched kernel tends to pull a fixed number of
inodes (enqueue=1031) from b_dirty. The new behavior is very interesting...

The attached test script runs 1 dd and 1 tar concurrently on XFS,
whose output can be found at the start of the trace files. The
elapsed time is 289s for vanilla kernel and 270s for patched kernel.

Thanks,
Fengguang
Subject:
Date: Sat Apr 23 12:27:27 CST 2011


Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
fs/fs-writeback.c | 16 +++++++++++-----
include/trace/events/writeback.h | 23 +++++++++++++++++++++++
2 files changed, 34 insertions(+), 5 deletions(-)

--- linux-next.orig/fs/fs-writeback.c 2011-05-04 14:36:48.000000000 +0800
+++ linux-next/fs/fs-writeback.c 2011-05-04 14:37:39.000000000 +0800
@@ -250,15 +250,16 @@ static bool inode_dirtied_after(struct i
/*
* Move expired dirty inodes from @delaying_queue to @dispatch_queue.
*/
-static void move_expired_inodes(struct list_head *delaying_queue,
- struct list_head *dispatch_queue,
- struct writeback_control *wbc)
+static int move_expired_inodes(struct list_head *delaying_queue,
+ struct list_head *dispatch_queue,
+ struct writeback_control *wbc)
{
LIST_HEAD(tmp);
struct list_head *pos, *node;
struct super_block *sb = NULL;
struct inode *inode;
int do_sb_sort = 0;
+ int moved = 0;

while (!list_empty(delaying_queue)) {
inode = wb_inode(delaying_queue->prev);
@@ -269,12 +270,13 @@ static void move_expired_inodes(struct l
do_sb_sort = 1;
sb = inode->i_sb;
list_move(&inode->i_wb_list, &tmp);
+ moved++;
}

/* just one sb in list, splice to dispatch_queue and we're done */
if (!do_sb_sort) {
list_splice(&tmp, dispatch_queue);
- return;
+ goto out;
}

/* Move inodes from one superblock together */
@@ -286,6 +288,8 @@ static void move_expired_inodes(struct l
list_move(&inode->i_wb_list, dispatch_queue);
}
}
+out:
+ return moved;
}

/*
@@ -301,9 +305,11 @@ static void move_expired_inodes(struct l
*/
static void queue_io(struct bdi_writeback *wb, struct writeback_control *wbc)
{
+ int moved;
assert_spin_locked(&inode_wb_list_lock);
list_splice_init(&wb->b_more_io, &wb->b_io);
- move_expired_inodes(&wb->b_dirty, &wb->b_io, wbc);
+ moved = move_expired_inodes(&wb->b_dirty, &wb->b_io, wbc);
+ trace_writeback_queue_io(wb, wbc, moved);
}

static int write_inode(struct inode *inode, struct writeback_control *wbc)
--- linux-next.orig/include/trace/events/writeback.h 2011-05-02 11:07:57.000000000 +0800
+++ linux-next/include/trace/events/writeback.h 2011-05-04 14:37:35.000000000 +0800
@@ -152,6 +152,29 @@ DEFINE_WBC_EVENT(wbc_balance_dirty_writt
DEFINE_WBC_EVENT(wbc_balance_dirty_wait);
DEFINE_WBC_EVENT(wbc_writepage);

+TRACE_EVENT(writeback_queue_io,
+ TP_PROTO(struct bdi_writeback *wb,
+ struct writeback_control *wbc,
+ int moved),
+ TP_ARGS(wb, wbc, moved),
+ TP_STRUCT__entry(
+ __array(char, name, 32)
+ __field(int, older)
+ __field(int, moved)
+ ),
+ TP_fast_assign(
+ strncpy(__entry->name, dev_name(wb->bdi->dev), 32);
+ __entry->older = wbc->older_than_this ?
+ (jiffies - *wbc->older_than_this) * 1000 / HZ
+ : -1;
+ __entry->moved = moved;
+ ),
+ TP_printk("bdi %s: older=%d enqueue=%d",
+ __entry->name,
+ __entry->older,
+ __entry->moved)
+);
+
DECLARE_EVENT_CLASS(writeback_congest_waited_template,

TP_PROTO(unsigned int usec_timeout, unsigned int usec_delayed),[unhandled content-type:application/x-sh]root@fat /home/wfg# bin/test-tar-dd.sh
umount: /dev/sda7: not mounted
meta-data=/dev/sda7 isize=256 agcount=4, agsize=6170464 blks
= sectsz=512 attr=2
data = bsize=4096 blocks=24681856, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0
log =internal log bsize=4096 blocks=12051, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
bin/test-tar-dd.sh:14: no such file or directory: /debug/tracing/events/writeback/writeback_single_inode/enable
18.95 134.64
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 11.5855 s, 90.5 MB/s
dd if=/dev/zero of=/fs/zero bs=1M count=1000 0.00s user 2.59s system 22% cpu 11.614 total
tar jxf /dev/shm/linux-2.6.38.3.tar.bz2 12.08s user 4.43s system 55% cpu 29.862 total
59.05 401.19
elapsed: 270.38

# tracer: nop
#
# TASK-PID CPU# TIMESTAMP FUNCTION
# | | | | |
flush-8:0-2926 [005] 19.491518: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [005] 19.491521: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [005] 19.491592: writeback_queue_io: bdi 8:0: older=-1 enqueue=644
flush-8:0-2926 [005] 19.511680: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [005] 19.512392: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [005] 19.513408: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [005] 19.514321: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [005] 19.521382: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [005] 19.522103: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [005] 19.530078: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [005] 19.530833: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [005] 19.534340: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [005] 19.538572: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [005] 19.542839: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [005] 19.547076: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [005] 19.551240: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [005] 19.555429: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [005] 19.559650: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [005] 19.563863: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [005] 19.568111: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
dd-2924 [002] 19.640092: writeback_queue_io: bdi 8:0: older=-1 enqueue=1008
flush-8:0-2926 [000] 19.934320: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [004] 20.182384: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 20.190345: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 20.191834: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 20.192749: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
dd-2924 [003] 20.215325: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
flush-8:0-2926 [000] 20.570616: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 20.571424: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 20.572249: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 20.573045: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [004] 20.759429: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [004] 20.760391: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [004] 20.761302: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
dd-2924 [000] 20.786554: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 20.790471: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 20.796459: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 20.814775: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 20.818366: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 20.822369: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 20.828361: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 20.838421: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 20.856283: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 20.894326: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 20.897156: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 20.901125: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 20.907124: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 20.918181: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 20.940281: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 20.942999: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 20.946983: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 20.952965: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 20.962948: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
flush-8:0-2926 [000] 20.968968: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 20.970181: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 20.971367: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 20.972552: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
dd-2924 [000] 20.985901: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 20.990851: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 20.997841: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.007815: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.025829: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.063984: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.066615: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.070600: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.076599: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.087573: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.109714: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.112475: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.116457: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.122441: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.132480: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.154576: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.157333: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.161318: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.167314: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
flush-8:0-2926 [001] 21.171047: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [001] 21.172293: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [001] 21.173527: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
dd-2924 [000] 21.194252: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.235402: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.238087: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.242104: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.248052: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.258124: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.284649: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.286932: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.290919: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.296899: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.306889: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.324897: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.358728: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
flush-8:0-2926 [000] 21.386536: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 21.387106: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 21.387664: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 21.388216: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
dd-2924 [000] 21.429514: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.433491: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.439458: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.453498: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.456406: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.460391: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.466386: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.476358: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.494301: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.532203: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.535163: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.539150: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.545141: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.555114: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.581393: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.585008: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.588993: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.594989: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
flush-8:0-2926 [000] 21.602369: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 21.602941: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 21.603496: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
dd-2924 [000] 21.620920: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.663323: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.665759: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.669745: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.675738: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.693686: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.696662: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.700648: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.706628: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.716617: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.734610: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.774548: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.777412: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.781419: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.787369: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.797350: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
flush-8:0-2926 [000] 21.811137: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 21.811708: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 21.812340: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 21.812899: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
dd-2924 [000] 21.820301: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.824264: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.830246: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.840275: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.859186: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.899544: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.902039: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.906018: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.912003: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.931784: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.934923: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.938910: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.944901: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.954875: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 21.972824: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 22.011067: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 22.013682: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 22.017666: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 22.023657: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
flush-8:0-2926 [000] 22.026325: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 22.026895: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 22.027450: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 22.028007: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
dd-2924 [000] 22.054316: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 22.057545: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 22.061539: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 22.067518: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 22.077512: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 22.097435: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 22.139106: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 22.143283: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 22.147265: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
dd-2924 [000] 22.153262: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
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dd-2924 [004] 25.983391: writeback_queue_io: bdi 8:0: older=-1 enqueue=1031
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flush-0:15-2236 [003] 27.147835: writeback_queue_io: bdi 0:15: older=30000 enqueue=0
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tar-2923 [001] 29.151841: writeback_queue_io: bdi 8:0: older=-1 enqueue=1038
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tar-2923 [003] 30.406614: writeback_queue_io: bdi 8:0: older=-1 enqueue=3212
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flush-8:0-2926 [002] 34.706149: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 34.706733: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 34.921688: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 34.922297: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 34.922873: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 34.923422: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 35.130528: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 35.131113: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 35.131663: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 35.132219: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 35.345774: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 35.346368: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 35.346914: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 35.660761: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 35.661339: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 35.661889: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 35.662474: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 35.868558: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 35.869192: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 35.869756: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 36.084358: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 36.084930: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 36.085490: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 36.086073: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 36.285689: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 36.286257: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 36.286820: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 36.613493: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 36.614062: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 36.614626: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 36.615175: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 37.001846: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 37.002698: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 37.003253: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 37.003800: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-0:15-2236 [004] 37.116839: writeback_queue_io: bdi 0:15: older=30000 enqueue=0
flush-8:0-2926 [000] 37.383966: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 37.384554: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 37.385108: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 37.808417: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 37.809034: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [000] 37.809452: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-0:15-2236 [004] 42.101397: writeback_queue_io: bdi 0:15: older=30000 enqueue=1
flush-8:0-2926 [002] 42.299344: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 42.299346: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2926 [002] 42.301467: writeback_queue_io: bdi 8:0: older=-1 enqueue=23904
flush-0:15-2236 [004] 47.085941: writeback_queue_io: bdi 0:15: older=30000 enqueue=6
flush-0:15-2236 [004] 47.085979: writeback_queue_io: bdi 0:15: older=30000 enqueue=0
flush-0:15-2236 [004] 47.085981: writeback_queue_io: bdi 0:15: older=30000 enqueue=0
flush-0:15-2236 [004] 47.085982: writeback_queue_io: bdi 0:15: older=-1 enqueue=7
flush-0:15-2236 [004] 48.937186: writeback_queue_io: bdi 0:15: older=-1 enqueue=7
flush-0:15-2236 [004] 48.937304: writeback_queue_io: bdi 0:15: older=-1 enqueue=7
flush-0:15-2236 [004] 48.937330: writeback_queue_io: bdi 0:15: older=0 enqueue=7
flush-8:0-2926 [003] 48.947592: writeback_queue_io: bdi 8:0: older=-1 enqueue=35715
flush-0:15-2236 [004] 53.921831: writeback_queue_io: bdi 0:15: older=30000 enqueue=0
flush-8:0-2926 [003] 54.465097: writeback_queue_io: bdi 8:0: older=-1 enqueue=34518
flush-8:0-2926 [003] 54.556999: writeback_queue_io: bdi 8:0: older=-1 enqueue=34271
flush-8:0-2926 [003] 54.641888: writeback_queue_io: bdi 8:0: older=3 enqueue=34271
flush-8:0-2926 [003] 54.733057: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-0:15-2236 [004] 54.733153: writeback_queue_io: bdi 0:15: older=0 enqueue=7
flush-0:15-2236 [004] 54.733175: writeback_queue_io: bdi 0:15: older=0 enqueue=0
flush-8:0-2926 [003] 54.735958: writeback_queue_io: bdi 8:0: older=2 enqueue=34271
flush-8:0-2926 [003] 57.066536: writeback_queue_io: bdi 8:0: older=2340 enqueue=3
flush-8:0-2926 [003] 57.066544: writeback_queue_io: bdi 8:0: older=2340 enqueue=0
flush-0:15-2236 [004] 68.683073: writeback_queue_io: bdi 0:15: older=30000 enqueue=0
flush-0:15-2236 [004] 73.667542: writeback_queue_io: bdi 0:15: older=30000 enqueue=0
flush-0:15-2236 [004] 78.652162: writeback_queue_io: bdi 0:15: older=30000 enqueue=0
flush-0:15-2236 [004] 83.636732: writeback_queue_io: bdi 0:15: older=30000 enqueue=0
flush-0:15-2236 [004] 88.621260: writeback_queue_io: bdi 0:15: older=30000 enqueue=0
root@fat /home/wfg# bin/test-tar-dd.sh
umount: /dev/sda7: not mounted
meta-data=/dev/sda7 isize=256 agcount=4, agsize=6170464 blks
= sectsz=512 attr=2
data = bsize=4096 blocks=24681856, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0
log =internal log bsize=4096 blocks=12051, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
bin/test-tar-dd.sh:14: no such file or directory: /debug/tracing/events/writeback/writeback_single_inode/enable
280.90 2235.98
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 14.8681 s, 70.5 MB/s
dd if=/dev/zero of=/fs/zero bs=1M count=1000 0.00s user 1.48s system 9% cpu 14.888 total
tar jxf /dev/shm/linux-2.6.38.3.tar.bz2 12.42s user 4.33s system 49% cpu 33.563 total
322.49 2524.47
elapsed: 288.99000000000024

# tracer: nop
#
# TASK-PID CPU# TIMESTAMP FUNCTION
# | | | | |
flush-8:0-2939 [006] 289.234869: writeback_queue_io: bdi 8:0: older=30000 enqueue=0
flush-8:0-2939 [006] 289.234872: writeback_queue_io: bdi 8:0: older=-1 enqueue=1
flush-8:0-2939 [000] 289.244973: writeback_queue_io: bdi 8:0: older=-1 enqueue=0
flush-8:0-2939 [000] 289.249918: writeback_queue_io: bdi 8:0: older=-1 enqueue=0
flush-8:0-2939 [000] 289.254722: writeback_queue_io: bdi 8:0: older=-1 enqueue=0
flush-8:0-2939 [000] 289.259679: writeback_queue_io: bdi 8:0: older=-1 enqueue=0
flush-8:0-2939 [000] 289.264460: writeback_queue_io: bdi 8:0: older=-1 enqueue=0
flush-8:0-2939 [002] 289.270664: writeback_queue_io: bdi 8:0: older=-1 enqueue=0
flush-8:0-2939 [002] 289.274682: writeback_queue_io: bdi 8:0: older=-1 enqueue=0
flush-8:0-2939 [002] 289.279065: writeback_queue_io: bdi 8:0: older=-1 enqueue=0
flush-8:0-2939 [002] 289.283450: writeback_queue_io: bdi 8:0: older=-1 enqueue=0
flush-8:0-2939 [002] 289.287875: writeback_queue_io: bdi 8:0: older=-1 enqueue=0
flush-8:0-2939 [002] 289.292278: writeback_queue_io: bdi 8:0: older=-1 enqueue=0
flush-8:0-2939 [002] 289.297190: writeback_queue_io: bdi 8:0: older=-1 enqueue=0
flush-8:0-2939 [002] 289.302320: writeback_queue_io: bdi 8:0: older=-1 enqueue=0
flush-8:0-2939 [002] 289.307390: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
flush-8:0-2939 [002] 289.311641: writeback_queue_io: bdi 8:0: older=-1 enqueue=0
flush-8:0-2939 [002] 289.315871: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
flush-8:0-2939 [002] 289.320143: writeback_queue_io: bdi 8:0: older=-1 enqueue=0
flush-8:0-2939 [002] 289.324426: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
flush-8:0-2939 [002] 289.328687: writeback_queue_io: bdi 8:0: older=-1 enqueue=0
dd-2938 [004] 289.399926: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
dd-2938 [004] 289.400601: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
dd-2938 [004] 289.402595: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
dd-2938 [004] 289.406672: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
dd-2938 [004] 289.414706: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
dd-2938 [004] 289.430701: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
dd-2938 [004] 289.462702: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
dd-2938 [004] 289.526711: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
tar-2937 [000] 289.618775: writeback_queue_io: bdi 8:0: older=-1 enqueue=5
dd-2938 [004] 289.626643: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
dd-2938 [004] 289.738324: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
dd-2938 [004] 289.738611: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
dd-2938 [004] 289.740605: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
dd-2938 [004] 289.744693: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
dd-2938 [004] 289.752691: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
flush-0:15-2212 [007] 289.763781: writeback_queue_io: bdi 0:15: older=30000 enqueue=1
flush-0:15-2212 [007] 289.763813: writeback_queue_io: bdi 0:15: older=-1 enqueue=8
dd-2938 [004] 289.772835: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
dd-2938 [004] 289.773643: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
dd-2938 [004] 289.775615: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
dd-2938 [004] 289.779692: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
dd-2938 [004] 289.787702: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
flush-8:0-2939 [002] 289.788072: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
dd-2938 [004] 289.803711: writeback_queue_io: bdi 8:0: older=-1 enqueue=0
flush-8:0-2939 [002] 289.891206: writeback_queue_io: bdi 8:0: older=-1 enqueue=0
dd-2938 [004] 289.896533: writeback_queue_io: bdi 8:0: older=-1 enqueue=6
dd-2938 [004] 290.045651: writeback_queue_io: bdi 8:0: older=-1 enqueue=6
dd-2938 [004] 290.047619: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
dd-2938 [004] 290.051702: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
dd-2938 [004] 290.059724: writeback_queue_io: bdi 8:0: older=-1 enqueue=5
tar-2937 [000] 290.067294: writeback_queue_io: bdi 8:0: older=-1 enqueue=5
flush-8:0-2939 [002] 290.096955: writeback_queue_io: bdi 8:0: older=-1 enqueue=4
flush-8:0-2939 [002] 290.175145: writeback_queue_io: bdi 8:0: older=-1 enqueue=2
dd-2938 [004] 290.190908: writeback_queue_io: bdi 8:0: older=-1 enqueue=102
flush-8:0-2939 [002] 290.381441: writeback_queue_io: bdi 8:0: older=-1 enqueue=24
flush-8:0-2939 [002] 290.381576: writeback_queue_io: bdi 8:0: older=-1 enqueue=5
flush-8:0-2939 [003] 290.424721: writeback_queue_io: bdi 8:0: older=-1 enqueue=146
dd-2938 [000] 290.436335: writeback_queue_io: bdi 8:0: older=-1 enqueue=110
tar-2937 [002] 290.436340: writeback_queue_io: bdi 8:0: older=-1 enqueue=0
dd-2938 [000] 290.440647: writeback_queue_io: bdi 8:0: older=-1 enqueue=254
dd-2938 [000] 290.442640: writeback_queue_io: bdi 8:0: older=-1 enqueue=254
dd-2938 [000] 290.446674: writeback_queue_io: bdi 8:0: older=-1 enqueue=254
dd-2938 [000] 290.454731: writeback_queue_io: bdi 8:0: older=-1 enqueue=254
dd-2938 [000] 290.475084: writeback_queue_io: bdi 8:0: older=-1 enqueue=254
dd-2938 [000] 290.476642: writeback_queue_io: bdi 8:0: older=-1 enqueue=254
dd-2938 [000] 290.478640: writeback_queue_io: bdi 8:0: older=-1 enqueue=254
dd-2938 [000] 290.482656: writeback_queue_io: bdi 8:0: older=-1 enqueue=254
dd-2938 [000] 290.490670: writeback_queue_io: bdi 8:0: older=-1 enqueue=254
dd-2938 [000] 290.506731: writeback_queue_io: bdi 8:0: older=-1 enqueue=254
flush-8:0-2939 [003] 290.542023: writeback_queue_io: bdi 8:0: older=-1 enqueue=254
flush-8:0-2939 [003] 290.542791: writeback_queue_io: bdi 8:0: older=-1 enqueue=0
dd-2938 [000] 290.543801: writeback_queue_io: bdi 8:0: older=-1 enqueue=144
flush-8:0-2939 [003] 290.645714: writeback_queue_io: bdi 8:0: older=-1 enqueue=255
dd-2938 [000] 290.661384: writeback_queue_io: bdi 8:0: older=-1 enqueue=118
dd-2938 [000] 290.662872: writeback_queue_io: bdi 8:0: older=-1 enqueue=145
tar-2937 [000] 290.671348: writeback_queue_io: bdi 8:0: older=-1 enqueue=48
dd-2938 [000] 291.093712: writeback_queue_io: bdi 8:0: older=-1 enqueue=280
dd-2938 [000] 291.094604: writeback_queue_io: bdi 8:0: older=-1 enqueue=0
flush-8:0-2939 [003] 291.196888: writeback_queue_io: bdi 8:0: older=-1 enqueue=254
flush-8:0-2939 [003] 291.322189: writeback_queue_io: bdi 8:0: older=-1 enqueue=1
dd-2938 [004] 291.344134: writeback_queue_io: bdi 8:0: older=-1 enqueue=40
tar-2937 [000] 291.348827: writeback_queue_io: bdi 8:0: older=-1 enqueue=258
tar-2937 [000] 291.350680: writeback_queue_io: bdi 8:0: older=-1 enqueue=297
tar-2937 [000] 291.352682: writeback_queue_io: bdi 8:0: older=-1 enqueue=297
tar-2937 [000] 291.356689: writeback_queue_io: bdi 8:0: older=-1 enqueue=297
tar-2937 [000] 291.364708: writeback_queue_io: bdi 8:0: older=-1 enqueue=297
flush-8:0-2939 [000] 291.374525: writeback_queue_io: bdi 8:0: older=-1 enqueue=298
flush-8:0-2939 [000] 291.374613: writeback_queue_io: bdi 8:0: older=-1 enqueue=5
flush-8:0-2939 [000] 291.374656: writeback_queue_io: bdi 8:0: older=-1 enqueue=0
flush-8:0-2939 [000] 291.376586: writeback_queue_io: bdi 8:0: older=-1 enqueue=293
flush-8:0-2939 [000] 291.377524: writeback_queue_io: bdi 8:0: older=-1 enqueue=5
flush-8:0-2939 [000] 291.379490: writeback_queue_io: bdi 8:0: older=-1 enqueue=293
dd-2938 [004] 291.386729: writeback_queue_io: bdi 8:0: older=-1 enqueue=51
flush-8:0-2939 [000] 291.751020: writeback_queue_io: bdi 8:0: older=-1 enqueue=300
flush-8:0-2939 [000] 291.889096: writeback_queue_io: bdi 8:0: older=-1 enqueue=2
dd-2938 [000] 291.922994: writeback_queue_io: bdi 8:0: older=-1 enqueue=141
tar-2937 [002] 291.923004: writeback_queue_io: bdi 8:0: older=-1 enqueue=1
flush-8:0-2939 [000] 291.943943: writeback_queue_io: bdi 8:0: older=-1 enqueue=305
tar-2937 [000] 291.962703: writeback_queue_io: bdi 8:0: older=-1 enqueue=432
tar-2937 [000] 291.965711: writeback_queue_io: bdi 8:0: older=-1 enqueue=440
tar-2937 [000] 291.970700: writeback_queue_io: bdi 8:0: older=-1 enqueue=440
tar-2937 [000] 291.979722: writeback_queue_io: bdi 8:0: older=-1 enqueue=440
flush-8:0-2939 [004] 291.989047: writeback_queue_io: bdi 8:0: older=-1 enqueue=440
dd-2938 [000] 291.989082: writeback_queue_io: bdi 8:0: older=-1 enqueue=0
dd-2938 [000] 291.990710: writeback_queue_io: bdi 8:0: older=-1 enqueue=440
dd-2938 [000] 291.993718: writeback_queue_io: bdi 8:0: older=-1 enqueue=440
tar-2937 [000] 291.996729: writeback_queue_io: bdi 8:0: older=-1 enqueue=440
dd-2938 [000] 291.999700: writeback_queue_io: bdi 8:0: older=-1 enqueue=440
dd-2938 [000] 292.009794: writeback_queue_io: bdi 8:0: older=-1 enqueue=440
dd-2938 [003] 292.038604: writeback_queue_io: bdi 8:0: older=-1 enqueue=490
flush-8:0-2939 [000] 292.078232: writeback_queue_io: bdi 8:0: older=-1 enqueue=142
flush-8:0-2939 [001] 292.110171: writeback_queue_io: bdi 8:0: older=-1 enqueue=301
flush-8:0-2939 [001] 293.075697: writeback_queue_io: bdi 8:0: older=-1 enqueue=5
flush-8:0-2939 [001] 293.078623: writeback_queue_io: bdi 8:0: older=-1 enqueue=496
flush-8:0-2939 [001] 293.080842: writeback_queue_io: bdi 8:0: older=-1 enqueue=12
flush-8:0-2939 [001] 293.085045: writeback_queue_io: bdi 8:0: older=-1 enqueue=15
flush-8:0-2939 [001] 293.088241: writeback_queue_io: bdi 8:0: older=-1 enqueue=494
flush-8:0-2939 [001] 293.090036: writeback_queue_io: bdi 8:0: older=-1 enqueue=27
flush-8:0-2939 [001] 293.092962: writeback_queue_io: bdi 8:0: older=-1 enqueue=494
flush-8:0-2939 [001] 293.094561: writeback_queue_io: bdi 8:0: older=-1 enqueue=12
flush-8:0-2939 [001] 293.095628: writeback_queue_io: bdi 8:0: older=-1 enqueue=15
flush-8:0-2939 [001] 293.098615: writeback_queue_io: bdi 8:0: older=-1 enqueue=506
flush-8:0-2939 [001] 293.099645: writeback_queue_io: bdi 8:0: older=-1 enqueue=15
flush-8:0-2939 [001] 293.102537: writeback_queue_io: bdi 8:0: older=-1 enqueue=506
flush-8:0-2939 [001] 293.103571: writeback_queue_io: bdi 8:0: older=-1 enqueue=15
flush-8:0-2939 [001] 293.106481: writeback_queue_io: bdi 8:0: older=-1 enqueue=506
flush-8:0-2939 [001] 293.107516: writeback_queue_io: bdi 8:0: older=-1 enqueue=15
flush-8:0-2939 [001] 293.110467: writeback_queue_io: bdi 8:0: older=-1 enqueue=506
flush-8:0-2939 [001] 293.111475: writeback_queue_io: bdi 8:0: older=-1 enqueue=15
dd-2938 [003] 293.146707: writeback_queue_io: bdi 8:0: older=-1 enqueue=642
tar-2937 [004] 293.153753: writeback_queue_io: bdi 8:0: older=-1 enqueue=277
flush-8:0-2939 [000] 293.315851: writeback_queue_io: bdi 8:0: older=-1 enqueue=15
flush-8:0-2939 [000] 293.338781: writeback_queue_io: bdi 8:0: older=-1 enqueue=379
dd-2938 [004] 293.353306: writeback_queue_io: bdi 8:0: older=-1 enqueue=263
flush-8:0-2939 [000] 293.353349: writeback_queue_io: bdi 8:0: older=-1 enqueue=8
flush-8:0-2939 [000] 293.354913: writeback_queue_io: bdi 8:0: older=-1 enqueue=649
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