Re: [MMTests] IO metadata on XFS

Mel Gorman
2012-07-03T11:00:07Z

On Tue, Jul 03, 2012 at 10:19:28AM +1000, Dave Chinner wrote:
> On Mon, Jul 02, 2012 at 08:35:16PM +0100, Mel Gorman wrote:
> > Adding dri-devel and a few others because an i915 patch contributed to
> > the regression.
> >
> > On Mon, Jul 02, 2012 at 03:32:15PM +0100, Mel Gorman wrote:
> > > On Mon, Jul 02, 2012 at 02:32:26AM -0400, Christoph Hellwig wrote:
> > > > > It increases the CPU overhead (dirty_inode can be called up to 4
> > > > > times per write(2) call, IIRC), so with limited numbers of
> > > > > threads/limited CPU power it will result in lower performance. Where
> > > > > you have lots of CPU power, there will be little difference in
> > > > > performance...
> > > >
> > > > When I checked it it could only be called twice, and we'd already
> > > > optimize away the second call. I'd defintively like to track down where
> > > > the performance changes happend, at least to a major version but even
> > > > better to a -rc or git commit.
> > > >
> > >
> > > By all means feel free to run the test yourself and run the bisection :)
> > >
> > > It's rare but on this occasion the test machine is idle so I started an
> > > automated git bisection. As you know the milage with an automated bisect
> > > varies so it may or may not find the right commit. Test machine is sandy so
> > > http://www.csn.ul.ie/~mel/postings/mmtests-20120424/global-dhp__io-metadata-xfs/sandy/comparison.html
> > > is the report of interest. The script is doing a full search between v3.3 and
> > > v3.4 for a point where average files/sec for fsmark-single drops below 25000.
> > > I did not limit the search to fs/xfs on the off-chance that it is an
> > > apparently unrelated patch that caused the problem.
> > >
> >
> > It was obvious very quickly that there were two distinct regression so I
> > ran two bisections. One led to a XFS and the other led to an i915 patch
> > that enables RC6 to reduce power usage.
> >
> > [aa464191: drm/i915: enable plain RC6 on Sandy Bridge by default]
>
> Doesn't seem to be the major cause of the regression. By itself, it
> has impact, but the majority comes from the XFS change...
>

The fact it has an impact at all is weird but lets see what the DRI
folks think about it.

> > [c999a223: xfs: introduce an allocation workqueue]
>
> Which indicates that there is workqueue scheduling issues, I think.
> The same amount of work is being done, but half of it is being
> pushed off into a workqueue to avoid stack overflow issues (*). I
> tested the above patch in anger on an 8p machine, similar to the
> machine you saw no regressions on, but the workload didn't drive it
> to being completely CPU bound (only about 90%) so the allocation
> work was probably always scheduled quickly.
>

What test were you using?

> How many worker threads have been spawned on these machines
> that are showing the regression?

20 or 21 generally. An example list as spotted by top looks like

kworker/0:0
kworker/0:1
kworker/0:2
kworker/1:0
kworker/1:1
kworker/1:2
kworker/2:0
kworker/2:1
kworker/2:2
kworker/3:0
kworker/3:1
kworker/3:2
kworker/4:0
kworker/4:1
kworker/5:0
kworker/5:1
kworker/6:0
kworker/6:1
kworker/6:2
kworker/7:0
kworker/7:1

There were 8 unbound workers.

> What is the context switch rate on the machines whenteh test is running?

This is vmstat from a vanilla kernel. The actual vmstat is after the --.
The information before that is recorded by mmtests to try and detect if
there was jitter in the vmstat output. It's showing that there is little
or no jitter in this test.

VANILLA
1341306582.6713 1.8109 1.8109 -- 0 0 0 16050784 11448 104056 0 0 376 0 209 526 0 0 99 1 0
1341306584.6715 3.8112 2.0003 -- 1 0 0 16050628 11448 104064 0 0 0 0 121 608 0 0 100 0 0
1341306586.6718 5.8114 2.0003 -- 0 0 0 16047432 11460 104288 0 0 102 45 227 999 0 0 99 1 0
1341306588.6721 7.8117 2.0003 -- 1 0 0 16046944 11460 104292 0 0 0 0 120 663 0 0 100 0 0
1341306590.6723 9.8119 2.0002 -- 0 2 0 16045788 11476 104296 0 0 12 40 190 754 0 0 99 0 0
1341306592.6725 11.8121 2.0002 -- 0 1 0 15990236 12600 141724 0 0 19054 30 1400 2937 2 1 88 9 0
1341306594.6727 13.8124 2.0002 -- 1 0 0 15907628 12600 186360 0 0 1653 0 3117 6406 2 9 88 1 0
1341306596.6730 15.8127 2.0003 -- 0 0 0 15825964 12608 226636 0 0 15 11024 3073 6350 2 9 89 0 0
1341306598.6733 17.8130 2.0003 -- 1 0 0 15730420 12608 271632 0 0 0 3072 3461 7179 2 10 88 0 0
1341306600.6736 19.8132 2.0003 -- 1 0 0 15686200 12608 310816 0 0 0 12416 3093 6198 2 9 89 0 0
1341306602.6738 21.8135 2.0003 -- 2 0 0 15593588 12616 354928 0 0 0 32 3482 7146 2 11 87 0 0
1341306604.6741 23.8138 2.0003 -- 2 0 0 15562032 12616 393772 0 0 0 12288 3129 6330 2 10 89 0 0
1341306606.6744 25.8140 2.0002 -- 1 0 0 15458316 12624 438004 0 0 0 26 3471 7107 2 11 87 0 0
1341306608.6746 27.8142 2.0002 -- 1 0 0 15432024 12624 474244 0 0 0 12416 3011 6017 1 10 89 0 0
1341306610.6749 29.8145 2.0003 -- 2 0 0 15343280 12624 517696 0 0 0 24 3393 6826 2 11 87 0 0
1341306612.6751 31.8148 2.0002 -- 1 0 0 15311136 12632 551816 0 0 0 16502 2818 5653 2 9 88 1 0
1341306614.6754 33.8151 2.0003 -- 1 0 0 15220648 12632 594936 0 0 0 3584 3451 6779 2 11 87 0 0
1341306616.6755 35.8152 2.0001 -- 4 0 0 15221252 12632 649296 0 0 0 38559 4846 8709 2 15 78 6 0
1341306618.6758 37.8155 2.0003 -- 1 0 0 15177724 12640 668476 0 0 20 40679 2204 4067 1 5 89 5 0
1341306620.6761 39.8158 2.0003 -- 1 0 0 15090204 12640 711752 0 0 0 0 3316 6788 2 11 88 0 0
1341306622.6764 41.8160 2.0003 -- 1 0 0 15005356 12640 748532 0 0 0 12288 3073 6132 2 10 89 0 0
1341306624.6766 43.8163 2.0002 -- 2 0 0 14913088 12648 791952 0 0 0 28 3408 6806 2 11 87 0 0
1341306626.6769 45.8166 2.0003 -- 1 0 0 14891512 12648 826328 0 0 0 12420 2906 5710 1 9 90 0 0
1341306628.6772 47.8168 2.0003 -- 1 0 0 14794316 12656 868936 0 0 0 26 3367 6798 2 11 87 0 0
1341306630.6774 49.8171 2.0003 -- 1 0 0 14769188 12656 905016 0 0 30 12324 3029 5876 2 10 89 0 0
1341306632.6777 51.8173 2.0002 -- 1 0 0 14679544 12656 947712 0 0 0 0 3399 6868 2 11 87 0 0
1341306634.6780 53.8176 2.0003 -- 1 0 0 14646156 12664 982032 0 0 0 14658 2987 5761 1 10 89 0 0
1341306636.6782 55.8179 2.0003 -- 1 0 0 14560504 12664 1023816 0 0 0 4404 3454 6876 2 11 87 0 0
1341306638.6783 57.8180 2.0001 -- 2 0 0 14533384 12664 1056812 0 0 0 15810 3002 5581 1 10 89 0 0
1341306640.6785 59.8182 2.0002 -- 1 0 0 14593332 12672 1027392 0 0 0 31790 3504 1811 1 13 78 8 0
1341306642.6787 61.8183 2.0001 -- 1 0 0 14686968 12672 1007604 0 0 0 14621 2434 1248 1 10 89 0 0
1341306644.6789 63.8185 2.0002 -- 1 1 0 15042476 12680 788104 0 0 0 36564 2809 1484 1 12 86 1 0
1341306646.6790 65.8187 2.0002 -- 1 0 0 15128292 12680 757948 0 0 0 26395 3050 1313 1 13 86 1 0
1341306648.6792 67.8189 2.0002 -- 1 0 0 15160036 12680 727964 0 0 0 5463 2752 910 1 12 87 0 0
1341306650.6795 69.8192 2.0003 -- 0 0 0 15633256 12688 332572 0 0 1156 12308 2117 2346 1 7 91 1 0
1341306652.6797 71.8194 2.0002 -- 0 0 0 15633892 12688 332652 0 0 0 0 224 758 0 0 100 0 0
1341306654.6800 73.8197 2.0003 -- 0 0 0 15633900 12688 332524 0 0 0 0 231 1009 0 0 100 0 0
1341306656.6803 75.8199 2.0003 -- 0 0 0 15637436 12696 332504 0 0 0 38 266 713 0 0 99 0 0
1341306658.6805 77.8202 2.0003 -- 0 0 0 15654180 12696 332352 0 0 0 0 270 821 0 0 100 0 0

REVERT-XFS
1341307733.8702 1.7941 1.7941 -- 0 0 0 16050640 12036 103996 0 0 372 0 216 752 0 0 99 1 0
1341307735.8704 3.7944 2.0002 -- 0 0 0 16050864 12036 104028 0 0 0 0 132 857 0 0 100 0 0
1341307737.8707 5.7946 2.0002 -- 0 0 0 16047492 12048 104252 0 0 102 37 255 938 0 0 99 1 0
1341307739.8709 7.7949 2.0003 -- 0 0 0 16047600 12072 104324 0 0 32 2 129 658 0 0 100 0 0
1341307741.8712 9.7951 2.0002 -- 1 1 0 16046676 12080 104328 0 0 0 32 165 729 0 0 100 0 0
1341307743.8714 11.7954 2.0003 -- 0 1 0 15990840 13216 142612 0 0 19422 30 1467 3015 2 1 89 8 0
1341307745.8717 13.7956 2.0002 -- 0 0 0 15825496 13216 226396 0 0 1310 11214 2217 1348 2 8 89 1 0
1341307747.8717 15.7957 2.0001 -- 1 0 0 15677816 13224 314672 0 0 4 15294 2307 1173 2 9 89 0 0
1341307749.8719 17.7959 2.0002 -- 1 0 0 15524372 13224 409728 0 0 0 12288 2466 888 1 10 89 0 0
1341307751.8721 19.7960 2.0002 -- 1 0 0 15368424 13224 502552 0 0 0 12416 2312 878 1 10 89 0 0
1341307753.8722 21.7962 2.0002 -- 1 0 0 15225216 13232 593092 0 0 0 12448 2539 1380 1 10 88 0 0
1341307755.8724 23.7963 2.0002 -- 2 0 0 15163712 13232 664768 0 0 0 32160 2184 1177 1 8 90 0 0
1341307757.8727 25.7967 2.0003 -- 1 0 0 14973888 13240 755080 0 0 0 12316 2482 1219 1 10 89 0 0
1341307759.8728 27.7968 2.0001 -- 1 0 0 14883580 13240 840036 0 0 0 44471 2711 1234 2 10 88 0 0
1341307761.8730 29.7970 2.0002 -- 1 0 0 14800304 13240 920504 0 0 0 42554 2571 1050 1 10 89 0 0
1341307763.8734 31.7973 2.0003 -- 0 0 0 14642504 13248 995004 0 0 0 3232 2276 1081 1 8 90 0 0
1341307765.8737 33.7976 2.0003 -- 1 0 0 14545072 13248 1052536 0 0 0 18688 2628 1114 1 9 89 0 0
1341307767.8739 35.7979 2.0003 -- 1 0 0 14783848 13248 926824 0 0 0 59559 2409 1308 0 10 89 1 0
1341307769.8740 37.7980 2.0001 -- 2 0 0 14854800 13256 896832 0 0 0 9172 2419 1004 1 10 89 1 0
1341307771.8742 39.7981 2.0002 -- 2 0 0 14835084 13256 875612 0 0 0 12288 2524 812 0 11 89 0 0
1341307773.8743 41.7983 2.0002 -- 2 0 0 15126252 13256 745844 0 0 0 10297 2714 1163 1 12 88 0 0
1341307775.8745 43.7985 2.0002 -- 1 0 0 15108800 13264 724544 0 0 0 12316 2499 931 1 11 88 0 0
1341307777.8746 45.7986 2.0001 -- 2 0 0 15226236 13264 694580 0 0 0 12416 2700 1194 1 12 88 0 0
1341307779.8750 47.7989 2.0003 -- 1 0 0 15697632 13264 300716 0 0 1156 0 934 1701 0 2 96 1 0
1341307781.8752 49.7992 2.0003 -- 0 0 0 15697508 13272 300720 0 0 0 66 166 641 0 0 100 0 0
1341307783.8755 51.7995 2.0003 -- 0 0 0 15699008 13272 300524 0 0 0 0 248 865 0 0 100 0 0
1341307785.8758 53.7997 2.0003 -- 0 0 0 15702452 13272 300520 0 0 0 0 285 960 0 0 99 0 0
1341307787.8760 55.7999 2.0002 -- 0 0 0 15719404 13280 300436 0 0 0 26 136 590 0 0 99 0 0

Vanilla average context switch rate 4278.53
Revert average context switch rate 1095

> Can you run latencytop to see
> if there is excessive starvation/wait times for allocation
> completion?

I'm not sure what format you are looking for. latencytop is shit for
capturing information throughout a test and it does not easily allow you to
record a snapshot of a test. You can record all the console output of course
but that's a complete mess. I tried capturing /proc/latency_stats over time
instead because that can be trivially sorted on a system-wide basis but
as I write this I find that latency_stats was bust. It was just spitting out

Latency Top version : v0.1

and nothing else. Either latency_stats is broken or my config is. Not sure
which it is right now and won't get enough time on this today to pinpoint it.

> A pert top profile comparison might be informative,
> too...
>

I'm not sure if this is what you really wanted. I thought an oprofile or
perf report would have made more sense but I recorded perf top over time
anyway and it's at the end of the mail. The timestamp information is poor
because the perf top information was buffered so it would receive a bunch
of updates at once. Each sample should be roughly 2 seconds apart. This
buffering can be dealt with, I just failed to do it in advance and I do
not think it's necessary to rerun the tests for it.

> (*) The stack usage below submit_bio() can be more than 5k (DM, MD,
> SCSI, driver, memory allocation), so it's really not safe to do
> allocation anywhere below about 3k of kernel stack being used. e.g.
> on a relatively trivial storage setup without the above commit:
>
> [142296.384921] flush-253:4 used greatest stack depth: 360 bytes left
>
> Fundamentally, 8k stacks on x86-64 are too small for our
> increasingly complex storage layers and the 100+ function deep call
> chains that occur.
>

I understand the patches motivation. For these tests I'm being deliberately
a bit of a dummy and just capturing information. This might allow me to
actually get through all the results and identify some of the problems
and spread them around a bit. Either that or I need to clone myself a few
times to tackle each of the problems in a reasonable timeframe :)

For just these XFS tests I've uploaded a tarball of the logs to
http://www.csn.ul.ie/~mel/postings/xfsbisect-20120703/xfsbisect-logs.tar.gz

For results with no monitor you can find them somewhere like this

default/no-monitor/sandy/fsmark-single-3.4.0-vanilla/noprofile/fsmark.log

Results with monitors attached are in run-monitor. You
can read the iostat logs for example from

default/run-monitor/sandy/iostat-3.4.0-vanilla-fsmark-single

Some of the monitor logs are gzipped.

This is perf top over time for the vanilla kernel

time: 1341306570

time: 1341306579
PerfTop: 1 irqs/sec kernel: 0.0% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

61.85% [kernel] [k] __rmqueue
38.15% libc-2.11.3.so [.] _IO_vfscanf

time: 1341306579
PerfTop: 3 irqs/sec kernel:66.7% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

19.88% [kernel] [k] _raw_spin_lock_irqsave
17.14% [kernel] [k] __rmqueue
16.96% [kernel] [k] format_decode
15.37% libc-2.11.3.so [.] __tzfile_compute
13.55% [kernel] [k] copy_user_generic_string
10.57% libc-2.11.3.so [.] _IO_vfscanf
6.53% [kernel] [k] find_first_bit

time: 1341306579
PerfTop: 0 irqs/sec kernel:-nan% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

17.51% [kernel] [k] _raw_spin_lock_irqsave
15.10% [kernel] [k] __rmqueue
14.94% [kernel] [k] format_decode
13.54% libc-2.11.3.so [.] __tzfile_compute
11.94% [kernel] [k] copy_user_generic_string
11.90% [kernel] [k] _raw_spin_lock
9.31% libc-2.11.3.so [.] _IO_vfscanf
5.75% [kernel] [k] find_first_bit

time: 1341306579
PerfTop: 41 irqs/sec kernel:58.5% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

13.62% [kernel] [k] _raw_spin_lock_irqsave
11.02% [kernel] [k] __rmqueue
10.91% [kernel] [k] format_decode
9.89% libc-2.11.3.so [.] __tzfile_compute
8.72% [kernel] [k] copy_user_generic_string
8.69% [kernel] [k] _raw_spin_lock
7.15% libc-2.11.3.so [.] _IO_vfscanf
4.20% [kernel] [k] find_first_bit
1.47% libc-2.11.3.so [.] __strcmp_sse42
1.37% libc-2.11.3.so [.] __strchr_sse42
1.19% sed [.] 0x0000000000009f7d
0.90% libc-2.11.3.so [.] vfprintf
0.84% [kernel] [k] hrtimer_interrupt
0.84% libc-2.11.3.so [.] re_string_realloc_buffers
0.76% [kernel] [k] enqueue_entity
0.66% [kernel] [k] __switch_to
0.65% libc-2.11.3.so [.] _IO_default_xsputn
0.62% [kernel] [k] do_vfs_ioctl
0.59% [kernel] [k] perf_event_mmap_event
0.56% gzip [.] 0x0000000000007b96
0.55% libc-2.11.3.so [.] bsearch

time: 1341306579
PerfTop: 35 irqs/sec kernel:62.9% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

11.50% [kernel] [k] _raw_spin_lock_irqsave
9.22% [kernel] [k] __rmqueue
9.13% [kernel] [k] format_decode
8.27% libc-2.11.3.so [.] __tzfile_compute
7.92% [kernel] [k] copy_user_generic_string
7.74% [kernel] [k] _raw_spin_lock
6.21% libc-2.11.3.so [.] _IO_vfscanf
3.51% [kernel] [k] find_first_bit
1.44% gzip [.] 0x0000000000007b96
1.23% libc-2.11.3.so [.] __strcmp_sse42
1.15% libc-2.11.3.so [.] __strchr_sse42
1.06% libc-2.11.3.so [.] vfprintf
0.99% sed [.] 0x0000000000009f7d
0.92% [unknown] [.] 0x00007f84a7766b99
0.70% [kernel] [k] hrtimer_interrupt
0.70% libc-2.11.3.so [.] re_string_realloc_buffers
0.64% [kernel] [k] enqueue_entity
0.58% libtcl8.5.so [.] 0x000000000006fe86
0.55% [kernel] [k] __switch_to
0.54% libc-2.11.3.so [.] _IO_default_xsputn
0.53% [kernel] [k] __d_lookup_rcu

time: 1341306585
PerfTop: 100 irqs/sec kernel:59.0% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

8.61% [kernel] [k] _raw_spin_lock_irqsave
5.92% [kernel] [k] __rmqueue
5.86% [kernel] [k] format_decode
5.31% libc-2.11.3.so [.] __tzfile_compute
5.30% [kernel] [k] copy_user_generic_string
5.27% [kernel] [k] _raw_spin_lock
3.99% libc-2.11.3.so [.] _IO_vfscanf
2.45% [unknown] [.] 0x00007f84a7766b99
2.26% [kernel] [k] find_first_bit
1.68% [kernel] [k] page_fault
1.45% libc-2.11.3.so [.] _int_malloc
1.28% gzip [.] 0x0000000000007b96
1.13% libc-2.11.3.so [.] vfprintf
1.06% libc-2.11.3.so [.] __strchr_sse42
1.02% perl [.] 0x0000000000044505
0.79% libc-2.11.3.so [.] __strcmp_sse42
0.79% [kernel] [k] do_task_stat
0.77% [kernel] [k] zap_pte_range
0.72% libc-2.11.3.so [.] __gconv_transform_utf8_internal
0.70% libc-2.11.3.so [.] malloc
0.70% libc-2.11.3.so [.] __mbrtowc

time: 1341306585
PerfTop: 19 irqs/sec kernel:78.9% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

7.97% [kernel] [k] _raw_spin_lock_irqsave
5.48% [kernel] [k] __rmqueue
5.43% [kernel] [k] format_decode
5.24% [kernel] [k] copy_user_generic_string
5.18% [kernel] [k] _raw_spin_lock
4.92% libc-2.11.3.so [.] __tzfile_compute
4.25% libc-2.11.3.so [.] _IO_vfscanf
2.33% [unknown] [.] 0x00007f84a7766b99
2.12% [kernel] [k] page_fault
2.09% [kernel] [k] find_first_bit
1.34% libc-2.11.3.so [.] _int_malloc
1.19% gzip [.] 0x0000000000007b96
1.05% libc-2.11.3.so [.] vfprintf
0.98% libc-2.11.3.so [.] __strchr_sse42
0.94% perl [.] 0x0000000000044505
0.94% libc-2.11.3.so [.] _dl_addr
0.91% [kernel] [k] zap_pte_range
0.74% [kernel] [k] s_show
0.73% libc-2.11.3.so [.] __strcmp_sse42
0.73% [kernel] [k] do_task_stat
0.67% libc-2.11.3.so [.] __gconv_transform_utf8_internal

time: 1341306585
PerfTop: 38 irqs/sec kernel:68.4% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

7.64% [kernel] [k] _raw_spin_lock_irqsave
4.89% [kernel] [k] _raw_spin_lock
4.77% [kernel] [k] __rmqueue
4.72% [kernel] [k] format_decode
4.56% [kernel] [k] copy_user_generic_string
4.53% libc-2.11.3.so [.] _IO_vfscanf
4.28% libc-2.11.3.so [.] __tzfile_compute
2.52% [unknown] [.] 0x00007f84a7766b99
no symbols found in /bin/sort, maybe install a debug package?
2.10% [kernel] [k] page_fault
1.82% [kernel] [k] find_first_bit
1.31% libc-2.11.3.so [.] _int_malloc
1.14% libc-2.11.3.so [.] vfprintf
1.08% libc-2.11.3.so [.] _dl_addr
1.07% [kernel] [k] s_show
1.05% libc-2.11.3.so [.] __strchr_sse42
1.03% gzip [.] 0x0000000000007b96
0.82% [kernel] [k] do_task_stat
0.82% perl [.] 0x0000000000044505
0.79% [kernel] [k] zap_pte_range
0.70% [kernel] [k] seq_put_decimal_ull
0.69% [kernel] [k] find_busiest_group

time: 1341306591
PerfTop: 66 irqs/sec kernel:59.1% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

6.52% [kernel] [k] _raw_spin_lock_irqsave
4.11% libc-2.11.3.so [.] _IO_vfscanf
3.91% [kernel] [k] _raw_spin_lock
3.50% [kernel] [k] copy_user_generic_string
3.41% [kernel] [k] __rmqueue
3.38% [kernel] [k] format_decode
3.06% libc-2.11.3.so [.] __tzfile_compute
2.90% [unknown] [.] 0x00007f84a7766b99
2.30% [kernel] [k] page_fault
2.20% perl [.] 0x0000000000044505
1.83% libc-2.11.3.so [.] vfprintf
1.61% libc-2.11.3.so [.] _int_malloc
1.30% [kernel] [k] find_first_bit
1.22% libc-2.11.3.so [.] _dl_addr
1.19% libc-2.11.3.so [.] __gconv_transform_utf8_internal
1.10% libc-2.11.3.so [.] __strchr_sse42
1.01% [kernel] [k] zap_pte_range
0.99% [kernel] [k] s_show
0.98% [kernel] [k] __percpu_counter_add
0.86% [kernel] [k] __strnlen_user
0.75% ld-2.11.3.so [.] do_lookup_x

time: 1341306591
PerfTop: 39 irqs/sec kernel:69.2% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

6.26% [kernel] [k] _raw_spin_lock_irqsave
4.05% [kernel] [k] _raw_spin_lock
3.86% libc-2.11.3.so [.] _IO_vfscanf
3.21% [kernel] [k] copy_user_generic_string
3.03% [kernel] [k] __rmqueue
3.00% [kernel] [k] format_decode
2.93% [unknown] [.] 0x00007f84a7766b99
2.72% libc-2.11.3.so [.] __tzfile_compute
2.20% [kernel] [k] page_fault
1.96% perl [.] 0x0000000000044505
1.77% libc-2.11.3.so [.] vfprintf
1.43% libc-2.11.3.so [.] _int_malloc
1.16% [kernel] [k] find_first_bit
1.09% libc-2.11.3.so [.] _dl_addr
1.06% libc-2.11.3.so [.] __gconv_transform_utf8_internal
1.02% [kernel] [k] s_show
0.98% libc-2.11.3.so [.] __strchr_sse42
0.93% gzip [.] 0x0000000000007b96
0.90% [kernel] [k] zap_pte_range
0.87% [kernel] [k] __percpu_counter_add
0.76% [kernel] [k] __strnlen_user

time: 1341306591
PerfTop: 185 irqs/sec kernel:70.8% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

4.81% [kernel] [k] _raw_spin_lock_irqsave
3.60% [unknown] [.] 0x00007f84a7766b99
3.10% [kernel] [k] _raw_spin_lock
3.04% [kernel] [k] page_fault
2.66% libc-2.11.3.so [.] _IO_vfscanf
2.14% [kernel] [k] copy_user_generic_string
2.11% [kernel] [k] format_decode
1.96% [kernel] [k] __rmqueue
1.86% libc-2.11.3.so [.] _dl_addr
1.76% libc-2.11.3.so [.] __tzfile_compute
1.26% perl [.] 0x0000000000044505
1.19% libc-2.11.3.so [.] __mbrtowc
1.14% libc-2.11.3.so [.] vfprintf
1.12% libc-2.11.3.so [.] _int_malloc
1.09% gzip [.] 0x0000000000007b96
0.95% libc-2.11.3.so [.] __gconv_transform_utf8_internal
0.88% [kernel] [k] _raw_spin_unlock_irqrestore
0.87% [kernel] [k] __strnlen_user
0.82% [kernel] [k] clear_page_c
0.77% [kernel] [k] __schedule
0.76% [kernel] [k] find_get_page

time: 1341306595
PerfTop: 385 irqs/sec kernel:48.8% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

27.20% cc1 [.] 0x0000000000210978
3.01% [unknown] [.] 0x00007f84a7766b99
2.18% [kernel] [k] page_fault
1.96% libbfd-2.21.so [.] 0x00000000000b9cdd
1.95% [kernel] [k] _raw_spin_lock_irqsave
1.91% ld.bfd [.] 0x000000000000e3b9
1.85% [kernel] [k] _raw_spin_lock
1.31% [kernel] [k] copy_user_generic_string
1.20% libbfd-2.21.so [.] bfd_hash_lookup
1.10% libc-2.11.3.so [.] __strcmp_sse42
0.93% libc-2.11.3.so [.] _IO_vfscanf
0.85% [kernel] [k] _raw_spin_unlock_irqrestore
0.82% libc-2.11.3.so [.] _int_malloc
0.80% [kernel] [k] __rmqueue
0.79% [kernel] [k] kmem_cache_alloc
0.74% [kernel] [k] format_decode
0.71% libc-2.11.3.so [.] _dl_addr
0.62% libbfd-2.21.so [.] _bfd_final_link_relocate
0.61% libc-2.11.3.so [.] __tzfile_compute
0.61% libc-2.11.3.so [.] vfprintf
0.59% [kernel] [k] find_busiest_group

time: 1341306595
PerfTop: 1451 irqs/sec kernel:87.3% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

9.75% cc1 [.] 0x0000000000210978
8.81% [unknown] [.] 0x00007f84a7766b99
4.62% [kernel] [k] page_fault
3.61% [kernel] [k] _raw_spin_lock
2.67% [kernel] [k] memcpy
2.03% [kernel] [k] _raw_spin_lock_irqsave
2.00% [kernel] [k] kmem_cache_alloc
1.64% [xfs] [k] _xfs_buf_find
1.31% [kernel] [k] _raw_spin_unlock_irqrestore
1.16% [kernel] [k] kmem_cache_free
1.15% [xfs] [k] xfs_next_bit
0.98% [kernel] [k] __d_lookup
0.89% [xfs] [k] xfs_da_do_buf
0.83% [kernel] [k] memset
0.80% [xfs] [k] xfs_dir2_node_addname_int
0.79% [kernel] [k] link_path_walk
0.76% [xfs] [k] xfs_buf_item_size
no symbols found in /usr/bin/tee, maybe install a debug package?
no symbols found in /bin/date, maybe install a debug package?
0.73% [xfs] [k] xfs_buf_offset
0.71% [kernel] [k] __kmalloc
0.70% [kernel] [k] kfree
0.70% libbfd-2.21.so [.] 0x00000000000b9cdd

time: 1341306601
PerfTop: 1267 irqs/sec kernel:85.2% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

10.81% [unknown] [.] 0x00007f84a7766b99
5.98% cc1 [.] 0x0000000000210978
5.20% [kernel] [k] page_fault
3.54% [kernel] [k] _raw_spin_lock
3.37% [kernel] [k] memcpy
2.03% [kernel] [k] kmem_cache_alloc
1.91% [kernel] [k] _raw_spin_lock_irqsave
1.75% [xfs] [k] _xfs_buf_find
1.35% [kernel] [k] _raw_spin_unlock_irqrestore
1.28% [xfs] [k] xfs_next_bit
1.14% [kernel] [k] kmem_cache_free
1.13% [kernel] [k] __kmalloc
1.12% [kernel] [k] __d_lookup
0.97% [xfs] [k] xfs_dir2_node_addname_int
0.96% [xfs] [k] xfs_buf_offset
0.95% [kernel] [k] memset
0.91% [kernel] [k] link_path_walk
0.88% [xfs] [k] xfs_da_do_buf
0.85% [kernel] [k] kfree
0.84% [xfs] [k] xfs_buf_item_size
0.74% [xfs] [k] xfs_btree_lookup

time: 1341306601
PerfTop: 1487 irqs/sec kernel:85.3% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

11.84% [unknown] [.] 0x00007f84a7766b99
5.15% [kernel] [k] page_fault
3.93% cc1 [.] 0x0000000000210978
3.76% [kernel] [k] _raw_spin_lock
3.50% [kernel] [k] memcpy
2.13% [kernel] [k] kmem_cache_alloc
1.91% [xfs] [k] _xfs_buf_find
1.79% [kernel] [k] _raw_spin_lock_irqsave
1.52% [kernel] [k] __kmalloc
1.33% [kernel] [k] kmem_cache_free
1.32% [kernel] [k] _raw_spin_unlock_irqrestore
1.29% [kernel] [k] __d_lookup
1.27% [xfs] [k] xfs_next_bit
1.11% [kernel] [k] link_path_walk
1.01% [xfs] [k] xfs_buf_offset
1.00% [xfs] [k] xfs_dir2_node_addname_int
0.98% [xfs] [k] xfs_da_do_buf
0.97% [kernel] [k] kfree
0.96% [kernel] [k] memset
0.84% [xfs] [k] xfs_btree_lookup
0.82% [xfs] [k] xfs_buf_item_format

time: 1341306601
PerfTop: 1291 irqs/sec kernel:85.9% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

12.21% [unknown] [.] 0x00007f84a7766b99
5.18% [kernel] [k] page_fault
3.83% [kernel] [k] _raw_spin_lock
3.67% [kernel] [k] memcpy
2.92% cc1 [.] 0x0000000000210978
2.28% [kernel] [k] kmem_cache_alloc
2.18% [xfs] [k] _xfs_buf_find
1.66% [kernel] [k] _raw_spin_lock_irqsave
1.56% [kernel] [k] __kmalloc
1.43% [kernel] [k] __d_lookup
1.43% [kernel] [k] _raw_spin_unlock_irqrestore
1.40% [kernel] [k] kmem_cache_free
1.29% [xfs] [k] xfs_next_bit
1.13% [xfs] [k] xfs_buf_offset
1.07% [kernel] [k] link_path_walk
1.04% [xfs] [k] xfs_da_do_buf
1.01% [kernel] [k] memset
1.01% [kernel] [k] kfree
1.00% [xfs] [k] xfs_dir2_node_addname_int
0.87% [xfs] [k] xfs_buf_item_size
0.84% [xfs] [k] xfs_btree_lookup

time: 1341306607
PerfTop: 1435 irqs/sec kernel:87.9% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

12.06% [unknown] [.] 0x00007f84a7766b99
5.40% [kernel] [k] page_fault
3.88% [kernel] [k] _raw_spin_lock
3.83% [kernel] [k] memcpy
2.41% [xfs] [k] _xfs_buf_find
2.35% [kernel] [k] kmem_cache_alloc
2.19% cc1 [.] 0x0000000000210978
1.68% [kernel] [k] _raw_spin_lock_irqsave
1.55% [kernel] [k] __kmalloc
1.48% [kernel] [k] __d_lookup
1.43% [kernel] [k] kmem_cache_free
1.42% [kernel] [k] _raw_spin_unlock_irqrestore
1.37% [xfs] [k] xfs_next_bit
1.27% [xfs] [k] xfs_buf_offset
1.12% [kernel] [k] link_path_walk
1.09% [kernel] [k] kfree
1.08% [kernel] [k] memset
1.04% [xfs] [k] xfs_da_do_buf
0.99% [xfs] [k] xfs_dir2_node_addname_int
0.92% [xfs] [k] xfs_buf_item_size
0.89% [xfs] [k] xfs_btree_lookup

time: 1341306607
PerfTop: 1281 irqs/sec kernel:87.0% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

12.00% [unknown] [.] 0x00007f84a7766b99
5.44% [kernel] [k] page_fault
4.04% [kernel] [k] _raw_spin_lock
3.94% [kernel] [k] memcpy
2.51% [xfs] [k] _xfs_buf_find
2.32% [kernel] [k] kmem_cache_alloc
1.75% cc1 [.] 0x0000000000210978
1.66% [kernel] [k] _raw_spin_lock_irqsave
1.58% [kernel] [k] __d_lookup
1.56% [kernel] [k] __kmalloc
1.46% [xfs] [k] xfs_next_bit
1.44% [kernel] [k] kmem_cache_free
1.41% [kernel] [k] _raw_spin_unlock_irqrestore
1.34% [xfs] [k] xfs_buf_offset
1.20% [kernel] [k] link_path_walk
1.16% [kernel] [k] kfree
1.11% [kernel] [k] memset
1.04% [xfs] [k] xfs_dir2_node_addname_int
0.94% [xfs] [k] xfs_da_do_buf
0.92% [xfs] [k] xfs_btree_lookup
0.89% [xfs] [k] xfs_buf_item_size

time: 1341306607
PerfTop: 1455 irqs/sec kernel:86.8% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

12.14% [unknown] [.] 0x00007f84a7766b99
5.36% [kernel] [k] page_fault
4.12% [kernel] [k] _raw_spin_lock
4.02% [kernel] [k] memcpy
2.54% [xfs] [k] _xfs_buf_find
2.41% [kernel] [k] kmem_cache_alloc
1.69% [kernel] [k] _raw_spin_lock_irqsave
1.56% [kernel] [k] __kmalloc
1.49% [xfs] [k] xfs_next_bit
1.47% [kernel] [k] __d_lookup
1.42% [kernel] [k] _raw_spin_unlock_irqrestore
1.39% [xfs] [k] xfs_buf_offset
1.39% cc1 [.] 0x0000000000210978
1.37% [kernel] [k] kmem_cache_free
1.24% [kernel] [k] link_path_walk
1.17% [kernel] [k] memset
1.16% [kernel] [k] kfree
1.07% [xfs] [k] xfs_dir2_node_addname_int
0.99% [xfs] [k] xfs_buf_item_size
0.92% [xfs] [k] xfs_da_do_buf
0.91% [xfs] [k] xfs_btree_lookup

time: 1341306613
PerfTop: 1245 irqs/sec kernel:87.3% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

12.05% [unknown] [.] 0x00007f84a7766b99
5.40% [kernel] [k] page_fault
4.10% [kernel] [k] _raw_spin_lock
4.06% [kernel] [k] memcpy
2.74% [xfs] [k] _xfs_buf_find
2.40% [kernel] [k] kmem_cache_alloc
1.64% [kernel] [k] _raw_spin_lock_irqsave
1.58% [xfs] [k] xfs_next_bit
1.54% [kernel] [k] __kmalloc
1.49% [kernel] [k] __d_lookup
1.45% [kernel] [k] _raw_spin_unlock_irqrestore
1.41% [kernel] [k] kmem_cache_free
1.35% [xfs] [k] xfs_buf_offset
1.25% [kernel] [k] link_path_walk
1.22% [kernel] [k] kfree
1.16% [kernel] [k] memset
1.15% cc1 [.] 0x0000000000210978
1.02% [xfs] [k] xfs_buf_item_size
1.00% [xfs] [k] xfs_dir2_node_addname_int
0.92% [xfs] [k] xfs_btree_lookup
0.91% [xfs] [k] xfs_da_do_buf

time: 1341306613
PerfTop: 1433 irqs/sec kernel:87.2% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

12.04% [unknown] [.] 0x00007f84a7766b99
5.30% [kernel] [k] page_fault
4.08% [kernel] [k] memcpy
4.07% [kernel] [k] _raw_spin_lock
2.88% [xfs] [k] _xfs_buf_find
2.50% [kernel] [k] kmem_cache_alloc
1.72% [kernel] [k] _raw_spin_lock_irqsave
1.68% [xfs] [k] xfs_next_bit
1.56% [kernel] [k] __d_lookup
1.54% [kernel] [k] __kmalloc
1.48% [kernel] [k] _raw_spin_unlock_irqrestore
1.46% [kernel] [k] kmem_cache_free
1.40% [xfs] [k] xfs_buf_offset
1.25% [kernel] [k] link_path_walk
1.21% [kernel] [k] memset
1.18% [kernel] [k] kfree
1.04% [xfs] [k] xfs_buf_item_size
1.02% [xfs] [k] xfs_dir2_node_addname_int
0.95% [xfs] [k] xfs_btree_lookup
0.94% cc1 [.] 0x0000000000210978
0.90% [xfs] [k] xfs_da_do_buf

time: 1341306613
PerfTop: 1118 irqs/sec kernel:87.2% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

no symbols found in /usr/bin/vmstat, maybe install a debug package?
12.03% [unknown] [.] 0x00007f84a7766b99
5.48% [kernel] [k] page_fault
4.21% [kernel] [k] memcpy
4.11% [kernel] [k] _raw_spin_lock
2.98% [xfs] [k] _xfs_buf_find
2.47% [kernel] [k] kmem_cache_alloc
1.81% [kernel] [k] _raw_spin_lock_irqsave
1.72% [xfs] [k] xfs_next_bit
1.51% [kernel] [k] __kmalloc
1.48% [kernel] [k] kmem_cache_free
1.48% [kernel] [k] __d_lookup
1.47% [kernel] [k] _raw_spin_unlock_irqrestore
1.39% [xfs] [k] xfs_buf_offset
1.23% [kernel] [k] link_path_walk
1.19% [kernel] [k] memset
1.19% [kernel] [k] kfree
1.07% [xfs] [k] xfs_dir2_node_addname_int
1.01% [xfs] [k] xfs_buf_item_size
0.98% [xfs] [k] xfs_btree_lookup
0.93% [xfs] [k] xfs_buf_item_format
0.91% [xfs] [k] xfs_da_do_buf

time: 1341306617
PerfTop: 1454 irqs/sec kernel:87.6% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

11.93% [unknown] [.] 0x00007f84a7766b99
5.42% [kernel] [k] page_fault
4.28% [kernel] [k] memcpy
4.20% [kernel] [k] _raw_spin_lock
3.15% [xfs] [k] _xfs_buf_find
2.52% [kernel] [k] kmem_cache_alloc
1.76% [kernel] [k] _raw_spin_lock_irqsave
1.72% [xfs] [k] xfs_next_bit
1.59% [kernel] [k] __d_lookup
1.51% [kernel] [k] __kmalloc
1.49% [kernel] [k] _raw_spin_unlock_irqrestore
1.48% [kernel] [k] kmem_cache_free
1.40% [xfs] [k] xfs_buf_offset
1.29% [kernel] [k] memset
1.20% [kernel] [k] link_path_walk
1.17% [kernel] [k] kfree
1.09% [xfs] [k] xfs_dir2_node_addname_int
1.01% [xfs] [k] xfs_buf_item_size
0.95% [xfs] [k] xfs_btree_lookup
0.94% [xfs] [k] xfs_da_do_buf
0.91% [xfs] [k] xfs_buf_item_format

time: 1341306617
PerfTop: 1758 irqs/sec kernel:90.2% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

10.99% [unknown] [.] 0x00007f84a7766b99
5.40% [kernel] [k] _raw_spin_lock
4.82% [kernel] [k] page_fault
4.04% [kernel] [k] memcpy
3.86% [xfs] [k] _xfs_buf_find
2.31% [kernel] [k] kmem_cache_alloc
2.03% [kernel] [k] _raw_spin_lock_irqsave
1.67% [kernel] [k] _raw_spin_unlock_irqrestore
1.60% [kernel] [k] __d_lookup
1.60% [xfs] [k] xfs_next_bit
1.44% [kernel] [k] __kmalloc
1.36% [xfs] [k] xfs_buf_offset
1.35% [kernel] [k] kmem_cache_free
1.17% [kernel] [k] kfree
1.16% [kernel] [k] memset
1.08% [kernel] [k] link_path_walk
0.98% [xfs] [k] xfs_dir2_node_addname_int
0.97% [xfs] [k] xfs_btree_lookup
0.92% [xfs] [k] xfs_perag_put
0.90% [xfs] [k] xfs_buf_item_size
0.84% [xfs] [k] xfs_da_do_buf

time: 1341306623
PerfTop: 1022 irqs/sec kernel:88.6% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

10.93% [unknown] [.] 0x00007f84a7766b99
5.34% [kernel] [k] _raw_spin_lock
4.82% [kernel] [k] page_fault
4.01% [kernel] [k] memcpy
4.01% [xfs] [k] _xfs_buf_find
2.28% [kernel] [k] kmem_cache_alloc
2.00% [kernel] [k] _raw_spin_lock_irqsave
1.68% [kernel] [k] _raw_spin_unlock_irqrestore
1.60% [xfs] [k] xfs_next_bit
1.59% [kernel] [k] __d_lookup
1.41% [kernel] [k] __kmalloc
1.39% [kernel] [k] kmem_cache_free
1.35% [xfs] [k] xfs_buf_offset
1.15% [kernel] [k] kfree
1.15% [kernel] [k] memset
1.09% [kernel] [k] link_path_walk
0.98% [xfs] [k] xfs_dir2_node_addname_int
0.98% [xfs] [k] xfs_btree_lookup
0.91% [xfs] [k] xfs_perag_put
0.88% [xfs] [k] xfs_buf_item_size
0.86% [xfs] [k] xfs_da_do_buf

time: 1341306623
PerfTop: 1430 irqs/sec kernel:87.6% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

11.05% [unknown] [.] 0x00007f84a7766b99
5.24% [kernel] [k] _raw_spin_lock
4.89% [kernel] [k] page_fault
4.13% [kernel] [k] memcpy
3.96% [xfs] [k] _xfs_buf_find
2.35% [kernel] [k] kmem_cache_alloc
1.95% [kernel] [k] _raw_spin_lock_irqsave
1.77% [kernel] [k] _raw_spin_unlock_irqrestore
1.63% [kernel] [k] __d_lookup
1.54% [xfs] [k] xfs_next_bit
1.42% [kernel] [k] __kmalloc
1.41% [kernel] [k] kmem_cache_free
1.32% [xfs] [k] xfs_buf_offset
1.16% [kernel] [k] memset
1.11% [kernel] [k] kfree
1.10% [kernel] [k] link_path_walk
1.05% [xfs] [k] xfs_dir2_node_addname_int
0.99% [xfs] [k] xfs_btree_lookup
0.91% [xfs] [k] xfs_buf_item_size
0.87% [xfs] [k] xfs_da_do_buf
0.87% [xfs] [k] xfs_perag_put

time: 1341306623
PerfTop: 1267 irqs/sec kernel:87.1% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

11.20% [unknown] [.] 0x00007f84a7766b99
5.08% [kernel] [k] _raw_spin_lock
4.85% [kernel] [k] page_fault
4.12% [kernel] [k] memcpy
3.96% [xfs] [k] _xfs_buf_find
2.41% [kernel] [k] kmem_cache_alloc
1.94% [kernel] [k] _raw_spin_lock_irqsave
1.77% [kernel] [k] _raw_spin_unlock_irqrestore
1.61% [kernel] [k] __d_lookup
1.50% [xfs] [k] xfs_next_bit
1.44% [kernel] [k] __kmalloc
1.40% [kernel] [k] kmem_cache_free
1.31% [xfs] [k] xfs_buf_offset
no symbols found in /usr/bin/iostat, maybe install a debug package?
1.16% [kernel] [k] memset
1.11% [kernel] [k] kfree
1.06% [kernel] [k] link_path_walk
1.04% [xfs] [k] xfs_dir2_node_addname_int
1.01% [xfs] [k] xfs_btree_lookup
0.95% [xfs] [k] xfs_buf_item_size
0.90% [xfs] [k] xfs_da_do_buf
0.84% [xfs] [k] xfs_perag_put

time: 1341306629
PerfTop: 1399 irqs/sec kernel:88.3% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

11.12% [unknown] [.] 0x00007f84a7766b99
5.13% [kernel] [k] _raw_spin_lock
4.85% [kernel] [k] page_fault
4.23% [kernel] [k] memcpy
4.03% [xfs] [k] _xfs_buf_find
2.37% [kernel] [k] kmem_cache_alloc
1.96% [kernel] [k] _raw_spin_lock_irqsave
1.69% [kernel] [k] _raw_spin_unlock_irqrestore
1.63% [kernel] [k] __d_lookup
1.50% [xfs] [k] xfs_next_bit
1.45% [kernel] [k] __kmalloc
1.35% [kernel] [k] kmem_cache_free
1.32% [xfs] [k] xfs_buf_offset
1.17% [kernel] [k] memset
1.09% [kernel] [k] kfree
1.07% [xfs] [k] xfs_dir2_node_addname_int
1.07% [kernel] [k] link_path_walk
1.04% [xfs] [k] xfs_btree_lookup
1.02% [xfs] [k] xfs_buf_item_size
0.93% [xfs] [k] xfs_da_do_buf
0.84% [xfs] [k] xfs_buf_item_format

time: 1341306629
PerfTop: 1225 irqs/sec kernel:87.5% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

11.15% [unknown] [.] 0x00007f84a7766b99
5.02% [kernel] [k] _raw_spin_lock
4.85% [kernel] [k] page_fault
4.22% [kernel] [k] memcpy
4.19% [xfs] [k] _xfs_buf_find
2.32% [kernel] [k] kmem_cache_alloc
1.94% [kernel] [k] _raw_spin_lock_irqsave
1.71% [kernel] [k] __d_lookup
1.68% [kernel] [k] _raw_spin_unlock_irqrestore
1.54% [xfs] [k] xfs_next_bit
1.51% [kernel] [k] __kmalloc
1.36% [kernel] [k] kmem_cache_free
1.28% [xfs] [k] xfs_buf_offset
1.14% [kernel] [k] memset
1.09% [kernel] [k] kfree
1.06% [kernel] [k] link_path_walk
1.02% [xfs] [k] xfs_dir2_node_addname_int
0.99% [xfs] [k] xfs_buf_item_size
0.99% [xfs] [k] xfs_btree_lookup
0.92% [xfs] [k] xfs_da_do_buf
0.86% [kernel] [k] s_show

time: 1341306629
PerfTop: 1400 irqs/sec kernel:87.4% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

11.23% [unknown] [.] 0x00007f84a7766b99
5.07% [kernel] [k] _raw_spin_lock
4.87% [kernel] [k] page_fault
4.27% [xfs] [k] _xfs_buf_find
4.18% [kernel] [k] memcpy
2.31% [kernel] [k] kmem_cache_alloc
1.94% [kernel] [k] _raw_spin_lock_irqsave
1.73% [kernel] [k] __d_lookup
1.66% [kernel] [k] _raw_spin_unlock_irqrestore
1.49% [xfs] [k] xfs_next_bit
1.49% [kernel] [k] __kmalloc
1.40% [kernel] [k] kmem_cache_free
1.29% [xfs] [k] xfs_buf_offset
1.11% [kernel] [k] kfree
1.07% [kernel] [k] memset
1.07% [kernel] [k] link_path_walk
1.05% [xfs] [k] xfs_dir2_node_addname_int
0.99% [xfs] [k] xfs_buf_item_size
0.97% [xfs] [k] xfs_btree_lookup
0.93% [xfs] [k] xfs_da_do_buf
0.89% [kernel] [k] s_show

time: 1341306635
PerfTop: 1251 irqs/sec kernel:87.9% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

11.20% [unknown] [.] 0x00007f84a7766b99
5.10% [kernel] [k] _raw_spin_lock
4.82% [kernel] [k] page_fault
4.29% [xfs] [k] _xfs_buf_find
4.19% [kernel] [k] memcpy
2.26% [kernel] [k] kmem_cache_alloc
1.87% [kernel] [k] _raw_spin_lock_irqsave
1.83% [kernel] [k] __d_lookup
1.64% [kernel] [k] _raw_spin_unlock_irqrestore
1.53% [kernel] [k] __kmalloc
1.49% [xfs] [k] xfs_next_bit
1.41% [kernel] [k] kmem_cache_free
1.32% [xfs] [k] xfs_buf_offset
1.10% [kernel] [k] link_path_walk
1.09% [kernel] [k] memset
1.08% [kernel] [k] kfree
1.03% [xfs] [k] xfs_dir2_node_addname_int
0.99% [xfs] [k] xfs_buf_item_size
0.98% [xfs] [k] xfs_btree_lookup
0.96% [kernel] [k] s_show
0.93% [xfs] [k] xfs_da_do_buf

time: 1341306635
PerfTop: 1429 irqs/sec kernel:88.3% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

11.18% [unknown] [.] 0x00007f84a7766b99
5.13% [kernel] [k] _raw_spin_lock
4.82% [kernel] [k] page_fault
4.28% [xfs] [k] _xfs_buf_find
4.21% [kernel] [k] memcpy
2.23% [kernel] [k] kmem_cache_alloc
1.90% [kernel] [k] _raw_spin_lock_irqsave
1.83% [kernel] [k] __d_lookup
1.67% [kernel] [k] _raw_spin_unlock_irqrestore
1.52% [kernel] [k] __kmalloc
1.52% [xfs] [k] xfs_next_bit
1.36% [kernel] [k] kmem_cache_free
1.34% [xfs] [k] xfs_buf_offset
1.11% [kernel] [k] link_path_walk
1.11% [kernel] [k] memset
1.08% [kernel] [k] kfree
1.03% [xfs] [k] xfs_buf_item_size
1.03% [xfs] [k] xfs_dir2_node_addname_int
1.01% [kernel] [k] s_show
0.98% [xfs] [k] xfs_btree_lookup
0.94% [xfs] [k] xfs_da_do_buf

time: 1341306635
PerfTop: 1232 irqs/sec kernel:88.9% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

11.11% [unknown] [.] 0x00007f84a7766b99
5.13% [kernel] [k] _raw_spin_lock
4.87% [kernel] [k] page_fault
4.33% [xfs] [k] _xfs_buf_find
4.16% [kernel] [k] memcpy
2.24% [kernel] [k] kmem_cache_alloc
1.84% [kernel] [k] _raw_spin_lock_irqsave
1.82% [kernel] [k] __d_lookup
1.65% [kernel] [k] _raw_spin_unlock_irqrestore
1.50% [xfs] [k] xfs_next_bit
1.49% [kernel] [k] __kmalloc
1.34% [kernel] [k] kmem_cache_free
1.32% [xfs] [k] xfs_buf_offset
1.13% [kernel] [k] link_path_walk
1.13% [kernel] [k] kfree
1.11% [kernel] [k] memset
1.06% [kernel] [k] s_show
1.03% [xfs] [k] xfs_buf_item_size
1.02% [xfs] [k] xfs_dir2_node_addname_int
0.98% [xfs] [k] xfs_btree_lookup
0.94% [xfs] [k] xfs_da_do_buf

time: 1341306639
PerfTop: 1444 irqs/sec kernel:87.3% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

11.19% [unknown] [.] 0x00007f84a7766b99
5.10% [kernel] [k] _raw_spin_lock
4.95% [kernel] [k] page_fault
4.40% [xfs] [k] _xfs_buf_find
4.10% [kernel] [k] memcpy
2.20% [kernel] [k] kmem_cache_alloc
1.93% [kernel] [k] _raw_spin_lock_irqsave
1.81% [kernel] [k] __d_lookup
1.59% [kernel] [k] _raw_spin_unlock_irqrestore
1.50% [xfs] [k] xfs_next_bit
1.48% [kernel] [k] __kmalloc
1.37% [kernel] [k] kmem_cache_free
1.36% [xfs] [k] xfs_buf_offset
1.15% [kernel] [k] memset
1.12% [kernel] [k] s_show
1.12% [kernel] [k] link_path_walk
1.10% [kernel] [k] kfree
1.02% [xfs] [k] xfs_buf_item_size
0.99% [xfs] [k] xfs_btree_lookup
0.97% [xfs] [k] xfs_dir2_node_addname_int
0.94% [xfs] [k] xfs_da_do_buf

time: 1341306639
PerfTop: 1195 irqs/sec kernel:90.9% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

10.00% [unknown] [.] 0x00007f84a7766b99
5.17% [kernel] [k] _raw_spin_lock
4.44% [xfs] [k] _xfs_buf_find
4.37% [kernel] [k] page_fault
4.37% [kernel] [k] memcpy
2.30% [kernel] [k] kmem_cache_alloc
1.90% [kernel] [k] _raw_spin_lock_irqsave
1.63% [kernel] [k] __d_lookup
1.62% [kernel] [k] _raw_spin_unlock_irqrestore
1.59% [xfs] [k] xfs_buf_offset
1.50% [kernel] [k] kmem_cache_free
1.50% [kernel] [k] __kmalloc
1.49% [xfs] [k] xfs_next_bit
1.33% [kernel] [k] memset
1.28% [kernel] [k] kfree
1.11% [xfs] [k] xfs_buf_item_size
1.07% [kernel] [k] s_show
1.07% [kernel] [k] link_path_walk
0.93% [xfs] [k] xfs_btree_lookup
0.90% [xfs] [k] xfs_da_do_buf
0.84% [xfs] [k] xfs_dir2_node_addname_int

time: 1341306645
PerfTop: 1097 irqs/sec kernel:95.8% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

7.51% [unknown] [.] 0x00007f84a7766b99
5.02% [kernel] [k] _raw_spin_lock
4.63% [kernel] [k] memcpy
4.51% [xfs] [k] _xfs_buf_find
3.32% [kernel] [k] page_fault
2.37% [kernel] [k] kmem_cache_alloc
1.87% [kernel] [k] _raw_spin_lock_irqsave
1.77% [xfs] [k] xfs_buf_offset
1.75% [kernel] [k] __kmalloc
1.73% [xfs] [k] xfs_next_bit
1.65% [kernel] [k] memset
1.60% [kernel] [k] _raw_spin_unlock_irqrestore
1.53% [kernel] [k] kfree
1.52% [kernel] [k] kmem_cache_free
1.44% [xfs] [k] xfs_trans_ail_cursor_first
1.26% [kernel] [k] __d_lookup
1.26% [xfs] [k] xfs_buf_item_size
1.05% [kernel] [k] s_show
1.03% [xfs] [k] xfs_buf_item_format
0.92% [kernel] [k] __d_lookup_rcu
0.87% [kernel] [k] link_path_walk

time: 1341306645
PerfTop: 1038 irqs/sec kernel:95.2% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

5.89% [unknown] [.] 0x00007f84a7766b99
5.18% [kernel] [k] memcpy
4.60% [xfs] [k] _xfs_buf_find
4.52% [kernel] [k] _raw_spin_lock
2.60% [kernel] [k] page_fault
2.42% [kernel] [k] kmem_cache_alloc
1.99% [kernel] [k] __kmalloc
1.96% [xfs] [k] xfs_next_bit
1.93% [xfs] [k] xfs_buf_offset
1.84% [kernel] [k] _raw_spin_lock_irqsave
1.83% [kernel] [k] memset
1.80% [kernel] [k] kmem_cache_free
1.68% [kernel] [k] kfree
1.47% [xfs] [k] xfs_buf_item_size
1.45% [kernel] [k] _raw_spin_unlock_irqrestore
1.18% [kernel] [k] __d_lookup_rcu
1.13% [xfs] [k] xfs_trans_ail_cursor_first
1.12% [xfs] [k] xfs_buf_item_format
1.04% [kernel] [k] s_show
1.01% [kernel] [k] __d_lookup
0.93% [xfs] [k] xfs_da_do_buf

time: 1341306645
PerfTop: 1087 irqs/sec kernel:96.0% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

5.27% [kernel] [k] memcpy
4.77% [unknown] [.] 0x00007f84a7766b99
4.69% [xfs] [k] _xfs_buf_find
4.56% [kernel] [k] _raw_spin_lock
2.47% [kernel] [k] kmem_cache_alloc
2.18% [xfs] [k] xfs_next_bit
2.11% [kernel] [k] page_fault
2.00% [xfs] [k] xfs_buf_offset
1.99% [kernel] [k] __kmalloc
1.96% [kernel] [k] kmem_cache_free
1.85% [kernel] [k] kfree
1.82% [kernel] [k] memset
1.75% [kernel] [k] _raw_spin_lock_irqsave
1.58% [xfs] [k] xfs_buf_item_size
1.41% [kernel] [k] _raw_spin_unlock_irqrestore
1.23% [kernel] [k] __d_lookup_rcu
1.21% [xfs] [k] xfs_buf_item_format
0.99% [kernel] [k] s_show
0.97% [xfs] [k] xfs_perag_put
0.92% [xfs] [k] xfs_da_do_buf
0.92% [xfs] [k] xfs_trans_ail_cursor_first

time: 1341306651
PerfTop: 1157 irqs/sec kernel:96.5% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

5.53% [kernel] [k] memcpy
4.61% [xfs] [k] _xfs_buf_find
4.40% [kernel] [k] _raw_spin_lock
3.83% [unknown] [.] 0x00007f84a7766b99
2.67% [kernel] [k] kmem_cache_alloc
2.32% [xfs] [k] xfs_next_bit
2.21% [kernel] [k] __kmalloc
2.21% [xfs] [k] xfs_buf_offset
2.19% [kernel] [k] kmem_cache_free
1.92% [kernel] [k] memset
1.89% [kernel] [k] kfree
1.80% [xfs] [k] xfs_buf_item_size
1.70% [kernel] [k] page_fault
1.62% [kernel] [k] _raw_spin_lock_irqsave
1.50% [kernel] [k] _raw_spin_unlock_irqrestore
1.30% [xfs] [k] xfs_buf_item_format
1.27% [kernel] [k] __d_lookup_rcu
0.97% [xfs] [k] xfs_da_do_buf
0.96% [xfs] [k] xlog_cil_prepare_log_vecs
0.93% [kernel] [k] s_show
0.93% [xfs] [k] xfs_perag_put

time: 1341306651
PerfTop: 1073 irqs/sec kernel:95.5% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

5.76% [kernel] [k] memcpy
4.54% [xfs] [k] _xfs_buf_find
4.32% [kernel] [k] _raw_spin_lock
3.15% [unknown] [.] 0x00007f84a7766b99
2.77% [kernel] [k] kmem_cache_alloc
2.49% [xfs] [k] xfs_next_bit
2.36% [kernel] [k] __kmalloc
2.27% [kernel] [k] kmem_cache_free
2.20% [xfs] [k] xfs_buf_offset
1.88% [kernel] [k] memset
1.88% [kernel] [k] kfree
1.77% [xfs] [k] xfs_buf_item_size
1.62% [kernel] [k] _raw_spin_lock_irqsave
1.48% [kernel] [k] _raw_spin_unlock_irqrestore
1.42% [xfs] [k] xfs_buf_item_format
1.40% [kernel] [k] page_fault
1.39% [kernel] [k] __d_lookup_rcu
0.99% [xfs] [k] xfs_da_do_buf
0.96% [xfs] [k] xlog_cil_prepare_log_vecs
0.88% [kernel] [k] s_show
0.87% [xfs] [k] xfs_perag_put

time: 1341306651
PerfTop: 492 irqs/sec kernel:85.6% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

5.74% [kernel] [k] memcpy
4.48% [xfs] [k] _xfs_buf_find
4.27% [kernel] [k] _raw_spin_lock
3.00% [unknown] [.] 0x00007f84a7766b99
2.76% [kernel] [k] kmem_cache_alloc
2.54% [xfs] [k] xfs_next_bit
2.39% [kernel] [k] __kmalloc
2.30% [kernel] [k] kmem_cache_free
2.20% [xfs] [k] xfs_buf_offset
no symbols found in /bin/ps, maybe install a debug package?
1.96% [kernel] [k] kfree
1.92% [kernel] [k] memset
1.75% [xfs] [k] xfs_buf_item_size
1.56% [kernel] [k] _raw_spin_lock_irqsave
1.48% [kernel] [k] _raw_spin_unlock_irqrestore
1.44% [xfs] [k] xfs_buf_item_format
1.39% [kernel] [k] __d_lookup_rcu
1.36% [kernel] [k] page_fault
0.99% [xfs] [k] xlog_cil_prepare_log_vecs
0.96% [xfs] [k] xfs_da_do_buf
0.86% [kernel] [k] s_show
0.85% [xfs] [k] xfs_perag_put

time: 1341306657
PerfTop: 70 irqs/sec kernel:72.9% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

5.73% [kernel] [k] memcpy
4.47% [xfs] [k] _xfs_buf_find
4.27% [kernel] [k] _raw_spin_lock
2.99% [unknown] [.] 0x00007f84a7766b99
2.75% [kernel] [k] kmem_cache_alloc
2.53% [xfs] [k] xfs_next_bit
2.39% [kernel] [k] __kmalloc
2.30% [kernel] [k] kmem_cache_free
2.20% [xfs] [k] xfs_buf_offset
1.96% [kernel] [k] kfree
1.92% [kernel] [k] memset
1.75% [xfs] [k] xfs_buf_item_size
1.56% [kernel] [k] _raw_spin_lock_irqsave
1.49% [kernel] [k] _raw_spin_unlock_irqrestore
1.43% [xfs] [k] xfs_buf_item_format
1.38% [kernel] [k] __d_lookup_rcu
1.37% [kernel] [k] page_fault
0.98% [xfs] [k] xlog_cil_prepare_log_vecs
0.96% [xfs] [k] xfs_da_do_buf
0.89% [kernel] [k] s_show
0.85% [xfs] [k] xfs_perag_put

time: 1341306657
PerfTop: 87 irqs/sec kernel:71.3% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

5.72% [kernel] [k] memcpy
4.45% [xfs] [k] _xfs_buf_find
4.25% [kernel] [k] _raw_spin_lock
2.99% [unknown] [.] 0x00007f84a7766b99
2.74% [kernel] [k] kmem_cache_alloc
2.52% [xfs] [k] xfs_next_bit
2.38% [kernel] [k] __kmalloc
2.29% [kernel] [k] kmem_cache_free
2.19% [xfs] [k] xfs_buf_offset
1.95% [kernel] [k] kfree
1.91% [kernel] [k] memset
1.74% [xfs] [k] xfs_buf_item_size
1.56% [kernel] [k] _raw_spin_lock_irqsave
1.48% [kernel] [k] _raw_spin_unlock_irqrestore
1.43% [xfs] [k] xfs_buf_item_format
1.38% [kernel] [k] page_fault
1.38% [kernel] [k] __d_lookup_rcu
0.98% [xfs] [k] xlog_cil_prepare_log_vecs
0.96% [xfs] [k] xfs_da_do_buf
0.93% [kernel] [k] s_show
0.84% [xfs] [k] xfs_perag_put

time: 1341306657
PerfTop: 88 irqs/sec kernel:68.2% exact: 0.0% [1000Hz cycles], (all, 8 CPUs)
-------------------------------------------------------------------------------

5.69% [kernel] [k] memcpy
4.42% [xfs] [k] _xfs_buf_find
4.25% [kernel] [k] _raw_spin_lock
2.98% [unknown] [.] 0x00007f84a7766b99