Re: [PATCH v1 resend hot_track 00/16] vfs: hot data tracking

From: Zhi Yong Wu
Date: Wed Dec 05 2012 - 22:28:28 EST

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HI, guys

THe perf testing is done separately with fs_mark, fio, ffsb and
compilebench in one kvm guest.

Below is the performance testing report for hot tracking, and no obvious
perf downgrade is found.

Note: original kernel means its source code is not changed;
kernel with enabled hot tracking means its source code is with hot
tracking patchset.

The test env is set up as below:

root@debian-i386:/home/zwu# uname -a
Linux debian-i386 3.7.0-rc8+ #266 SMP Tue Dec 4 12:17:55 CST 2012 x86_64
GNU/Linux

root@debian-i386:/home/zwu# mkfs.xfs -f -l
size=1310b,sunit=8 /home/zwu/bdev.img
meta-data=/home/zwu/bdev.img isize=256 agcount=4, agsize=128000
blks
= sectsz=512 attr=2, projid32bit=0
data = bsize=4096 blocks=512000, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0
log =internal log bsize=4096 blocks=1310, version=2
= sectsz=512 sunit=1 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0

1.) original kernel

root@debian-i386:/home/zwu# mount -o
loop,logbsize=256k /home/zwu/bdev.img /mnt/scratch
[ 1197.421616] XFS (loop0): Mounting Filesystem
[ 1197.567399] XFS (loop0): Ending clean mount
root@debian-i386:/home/zwu# mount
/dev/sda1 on / type ext3 (rw,errors=remount-ro)
tmpfs on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
udev on /dev type tmpfs (rw,mode=0755)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=620)
none on /selinux type selinuxfs (rw,relatime)
debugfs on /sys/kernel/debug type debugfs (rw)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc
(rw,noexec,nosuid,nodev)
/dev/loop0 on /mnt/scratch type xfs (rw,logbsize=256k)
root@debian-i386:/home/zwu# free -m
total used free shared buffers
cached
Mem: 112 109 2 0 4
53
-/+ buffers/cache: 51 60
Swap: 713 29 684

2.) kernel with enabled hot tracking

root@debian-i386:/home/zwu# mount -o
hot_track,loop,logbsize=256k /home/zwu/bdev.img /mnt/scratch
[ 364.648470] XFS (loop0): Mounting Filesystem
[ 364.910035] XFS (loop0): Ending clean mount
[ 364.921063] VFS: Turning on hot data tracking
root@debian-i386:/home/zwu# mount
/dev/sda1 on / type ext3 (rw,errors=remount-ro)
tmpfs on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
udev on /dev type tmpfs (rw,mode=0755)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=620)
none on /selinux type selinuxfs (rw,relatime)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc
(rw,noexec,nosuid,nodev)
/dev/loop0 on /mnt/scratch type xfs (rw,hot_track,logbsize=256k)
root@debian-i386:/home/zwu# free -m
total used free shared buffers
cached
Mem: 112 107 4 0 2
34
-/+ buffers/cache: 70 41
Swap: 713 2 711

1. fs_mark test

1.) orginal kernel

# ./fs_mark -D 100 -S0 -n 1000 -s 1 -L 30 -d /mnt/scratch/0
-d /mnt/scratch/1 -d /mnt/scratch/2 -d /mnt/scratch/3
-d /mnt/scratch/4 -d /mnt/scratch/5 -d /mnt/scratch/6
-d /mnt/scratch/7
# Version 3.3, 8 thread(s) starting at Wed Dec 5 03:20:58 2012
# Sync method: NO SYNC: Test does not issue sync() or fsync() calls.
# Directories: Time based hash between directories across 100
subdirectories with 180 seconds per subdirectory.
# File names: 40 bytes long, (16 initial bytes of time stamp with 24
random bytes at end of name)
# Files info: size 1 bytes, written with an IO size of 16384 bytes per
write
# App overhead is time in microseconds spent in the test not doing file
writing related system calls.

FSUse% Count Size Files/sec App Overhead
2 8000 1 375.6 27175895
3 16000 1 375.6 27478079
4 24000 1 346.0 27819607
4 32000 1 316.9 25863385
5 40000 1 335.2 25460605
6 48000 1 312.3 25889196
7 56000 1 327.3 25000611
8 64000 1 304.4 28126698
9 72000 1 361.7 26652172
9 80000 1 370.1 27075875
10 88000 1 347.8 31093106
11 96000 1 387.1 26877324
12 104000 1 352.3 26635853
13 112000 1 379.3 26400198
14 120000 1 367.4 27228178
14 128000 1 359.2 27627871
15 136000 1 358.4 27089821
16 144000 1 385.5 27804852
17 152000 1 322.9 26221907
18 160000 1 393.2 26760040
18 168000 1 351.9 29210327
20 176000 1 395.2 24610548
20 184000 1 376.7 27518650
21 192000 1 340.1 27512874
22 200000 1 389.0 27109104
23 208000 1 389.7 29288594
24 216000 1 352.6 29948820
25 224000 1 380.4 26370958
26 232000 1 332.9 27770518
26 240000 1 333.6 25176691

2.) kernel with enabled hot tracking

# ./fs_mark -D 100 -S0 -n 1000 -s 1 -L 30 -d /mnt/scratch/0
-d /mnt/scratch/1 -d /mnt/scratch/2 -d /mnt/scratch/3
-d /mnt/scratch/4 -d /mnt/scratch/5 -d /mnt/scratch/6
-d /mnt/scratch/7
# Version 3.3, 8 thread(s) starting at Tue Dec 4 04:28:48 2012
# Sync method: NO SYNC: Test does not issue sync() or fsync() calls.
# Directories: Time based hash between directories across 100
subdirectories with 180 seconds per subdirectory.
# File names: 40 bytes long, (16 initial bytes of time stamp with 24
random bytes at end of name)
# Files info: size 1 bytes, written with an IO size of 16384 bytes per
write
# App overhead is time in microseconds spent in the test not doing file
writing related system calls.

FSUse% Count Size Files/sec App Overhead
4 8000 1 323.0 25104879
6 16000 1 351.4 25372919
8 24000 1 345.9 24107987
9 32000 1 313.2 26249533
10 40000 1 323.0 20312267
12 48000 1 303.2 22178040
14 56000 1 307.6 22775058
15 64000 1 317.9 25178845
17 72000 1 351.8 22020260
19 80000 1 369.3 23546708
21 88000 1 324.1 29068297
22 96000 1 355.3 25212333
24 104000 1 346.4 26622613
26 112000 1 360.4 25477193
28 120000 1 362.9 21774508
29 128000 1 329.0 25760109
31 136000 1 369.5 24540577
32 144000 1 330.2 26013559
34 152000 1 365.5 25643279
36 160000 1 366.2 24393130
38 168000 1 348.3 25248940
39 176000 1 357.3 24080574
40 184000 1 316.8 23011921
43 192000 1 351.7 27468060
44 200000 1 362.2 27540349
46 208000 1 340.9 26135445
48 216000 1 339.2 20926743
50 224000 1 316.5 21399871
52 232000 1 346.3 24669604
53 240000 1 320.5 22204449

2. FFSB test

1.) original kernel

FFSB version 6.0-RC2 started

benchmark time = 10
ThreadGroup 0
================
num_threads = 4

read_random = off
read_size = 40960 (40KB)
read_blocksize = 4096 (4KB)
read_skip = off
read_skipsize = 0 (0B)

write_random = off
write_size = 40960 (40KB)
fsync_file = 0
write_blocksize = 4096 (4KB)
wait time = 0

op weights
read = 0 (0.00%)
readall = 1 (10.00%)
write = 0 (0.00%)
create = 1 (10.00%)
append = 1 (10.00%)
delete = 1 (10.00%)
metaop = 0 (0.00%)
createdir = 0 (0.00%)
stat = 1 (10.00%)
writeall = 1 (10.00%)
writeall_fsync = 1 (10.00%)
open_close = 1 (10.00%)
write_fsync = 0 (0.00%)
create_fsync = 1 (10.00%)
append_fsync = 1 (10.00%)

FileSystem /mnt/scratch/test1
==========
num_dirs = 100
starting files = 0

Fileset weight:
33554432 ( 32MB) -> 1 (1.00%)
8388608 ( 8MB) -> 2 (2.00%)
524288 ( 512KB) -> 3 (3.00%)
262144 ( 256KB) -> 4 (4.00%)
131072 ( 128KB) -> 5 (5.00%)
65536 ( 64KB) -> 8 (8.00%)
32768 ( 32KB) -> 10 (10.00%)
16384 ( 16KB) -> 13 (13.00%)
8192 ( 8KB) -> 21 (21.00%)
4096 ( 4KB) -> 33 (33.00%)
directio = off
alignedio = off
bufferedio = off

aging is off
current utilization = 26.19%

creating new fileset /mnt/scratch/test1
fs setup took 87 secs
Syncing()...1 sec
Starting Actual Benchmark At: Wed Dec 5 03:38:06 2012

Syncing()...0 sec
FFSB benchmark finished at: Wed Dec 5 03:38:18 2012

Results:
Benchmark took 11.44 sec

Total Results
===============
Op Name Transactions Trans/sec % Trans % Op Weight
Throughput
======= ============ ========= ======= ===========
==========
readall : 93 8.13 0.880% 21.053%
32.5KB/sec
create : 20 1.75 0.189% 5.263%
6.99KB/sec
append : 10 0.87 0.095% 2.632%
3.5KB/sec
delete : 4 0.35 0.038% 10.526%
NA
stat : 3 0.26 0.028% 7.895%
NA
writeall : 2178 190.39 20.600% 10.526%
762KB/sec
writeall_fsync : 5 0.44 0.047% 5.263%
1.75KB/sec
open_close : 6 0.52 0.057% 15.789%
NA
create_fsync : 8234 719.78 77.878% 15.789%
2.81MB/sec
append_fsync : 20 1.75 0.189% 5.263%
6.99KB/sec
-
924.24 Transactions per Second

Throughput Results
===================
Read Throughput: 32.5KB/sec
Write Throughput: 3.57MB/sec

System Call Latency statistics in millisecs
=====
Min Avg Max Total Calls
======== ======== ======== ============
[ open] 0.050000 3.980161 41.840000 31
-
[ read] 0.017000 71.442215 1286.122000 93
-
[ write] 0.052000 1.034817 2201.956000 10467
-
[ unlink] 1.118000 185.398750 730.807000 4
-
[ close] 0.019000 1.968968 39.679000 31
-
[ stat] 0.043000 2.173667 6.428000 3
-

0.8% User Time
9.2% System Time
10.0% CPU Utilization

2.) kernel with enabled hot tracking

FFSB version 6.0-RC2 started

benchmark time = 10
ThreadGroup 0
================
num_threads = 4

read_random = off
read_size = 40960 (40KB)
read_blocksize = 4096 (4KB)
read_skip = off
read_skipsize = 0 (0B)

write_random = off
write_size = 40960 (40KB)
fsync_file = 0
write_blocksize = 4096 (4KB)
wait time = 0

op weights
read = 0 (0.00%)
readall = 1 (10.00%)
write = 0 (0.00%)
create = 1 (10.00%)
append = 1 (10.00%)
delete = 1 (10.00%)
metaop = 0 (0.00%)
createdir = 0 (0.00%)
stat = 1 (10.00%)
writeall = 1 (10.00%)
writeall_fsync = 1 (10.00%)
open_close = 1 (10.00%)
write_fsync = 0 (0.00%)
create_fsync = 1 (10.00%)
append_fsync = 1 (10.00%)

FileSystem /mnt/scratch/test1
==========
num_dirs = 100
starting files = 0

Fileset weight:
33554432 ( 32MB) -> 1 (1.00%)
8388608 ( 8MB) -> 2 (2.00%)
524288 ( 512KB) -> 3 (3.00%)
262144 ( 256KB) -> 4 (4.00%)
131072 ( 128KB) -> 5 (5.00%)
65536 ( 64KB) -> 8 (8.00%)
32768 ( 32KB) -> 10 (10.00%)
16384 ( 16KB) -> 13 (13.00%)
8192 ( 8KB) -> 21 (21.00%)
4096 ( 4KB) -> 33 (33.00%)
directio = off
alignedio = off
bufferedio = off

aging is off
current utilization = 52.46%

creating new fileset /mnt/scratch/test1
fs setup took 42 secs
Syncing()...1 sec
Starting Actual Benchmark At: Tue Dec 4 06:41:54 2012

Syncing()...0 sec
FFSB benchmark finished at: Tue Dec 4 06:42:53 2012

Results:
Benchmark took 59.42 sec

Total Results
===============
Op Name Transactions Trans/sec % Trans % Op Weight
Throughput
======= ============ ========= ======= ===========
==========
readall : 10510 176.87 54.808% 10.959%
707KB/sec
create : 48 0.81 0.250% 9.589%
3.23KB/sec
append : 100 1.68 0.521% 13.699%
6.73KB/sec
delete : 5 0.08 0.026% 6.849%
NA
stat : 5 0.08 0.026% 6.849%
NA
writeall : 130 2.19 0.678% 12.329%
8.75KB/sec
writeall_fsync : 19 0.32 0.099% 8.219%
1.28KB/sec
open_close : 9 0.15 0.047% 12.329%
NA
create_fsync : 8300 139.67 43.283% 12.329%
559KB/sec
append_fsync : 50 0.84 0.261% 6.849%
3.37KB/sec
-
322.70 Transactions per Second

Throughput Results
===================
Read Throughput: 707KB/sec
Write Throughput: 582KB/sec

System Call Latency statistics in millisecs
=====
Min Avg Max Total Calls
======== ======== ======== ============
[ open] 0.061000 0.750540 10.721000 63
-
[ read] 0.017000 11.058425 28555.394000 10510
-
[ write] 0.034000 6.705286 26812.076000 8647
-
[ unlink] 0.922000 7.679800 25.364000 5
-
[ close] 0.019000 0.996635 34.723000 63
-
[ stat] 0.046000 0.942800 4.489000 5
-

0.2% User Time
2.6% System Time
2.8% CPU Utilization

3. fio test

1.) original kernel

seq-read: (g=0): rw=read, bs=8K-8K/8K-8K, ioengine=libaio, iodepth=8
...
seq-read: (g=0): rw=read, bs=8K-8K/8K-8K, ioengine=libaio, iodepth=8
seq-write: (g=1): rw=write, bs=8K-8K/8K-8K, ioengine=libaio, iodepth=8
...
seq-write: (g=1): rw=write, bs=8K-8K/8K-8K, ioengine=libaio, iodepth=8
rnd-read: (g=2): rw=randread, bs=8K-8K/8K-8K, ioengine=libaio, iodepth=8
...
rnd-read: (g=2): rw=randread, bs=8K-8K/8K-8K, ioengine=libaio, iodepth=8
rnd-write: (g=3): rw=randwrite, bs=8K-8K/8K-8K, ioengine=libaio,
iodepth=8
...
rnd-write: (g=3): rw=randwrite, bs=8K-8K/8K-8K, ioengine=libaio,
iodepth=8
Starting 16 threads

seq-read: (groupid=0, jobs=4): err= 0: pid=1646
read : io=2,835MB, bw=24,192KB/s, iops=3,023, runt=120021msec
slat (usec): min=0, max=999K, avg=1202.67, stdev=3145.84
clat (usec): min=0, max=1,536K, avg=9186.07, stdev=11344.56
bw (KB/s) : min= 39, max=21301, per=26.11%, avg=6315.41,
stdev=1082.63
cpu : usr=10.89%, sys=33.14%, ctx=1488108, majf=13, minf=2238
IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=100.0%, 16=0.0%, 32=0.0%,
>=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
complete : 0=0.0%, 4=100.0%, 8=0.1%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
issued r/w: total=362940/0, short=0/0
lat (usec): 2=3.53%, 50=0.01%, 100=0.01%, 250=0.01%, 500=0.01%
lat (usec): 750=0.03%, 1000=0.03%
lat (msec): 2=1.75%, 4=1.08%, 10=68.93%, 20=22.39%, 50=2.02%
lat (msec): 100=0.16%, 250=0.04%, 1000=0.01%, 2000=0.03%
seq-write: (groupid=1, jobs=4): err= 0: pid=1646
write: io=1,721MB, bw=14,652KB/s, iops=1,831, runt=120277msec
slat (usec): min=0, max=1,004K, avg=1744.41, stdev=3144.06
clat (usec): min=0, max=1,014K, avg=15699.65, stdev=19751.69
bw (KB/s) : min= 285, max=18032, per=26.41%, avg=3869.67,
stdev=762.96
cpu : usr=6.29%, sys=22.61%, ctx=880380, majf=36, minf=3222
IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=100.0%, 16=0.0%, 32=0.0%,
>=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
complete : 0=0.0%, 4=100.0%, 8=0.1%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
issued r/w: total=0/220282, short=0/0
lat (usec): 2=2.43%, 500=0.01%, 750=0.12%, 1000=0.14%
lat (msec): 2=0.86%, 4=1.72%, 10=39.03%, 20=42.20%, 50=11.87%
lat (msec): 100=1.15%, 250=0.17%, 500=0.06%, 750=0.14%, 1000=0.09%
lat (msec): 2000=0.02%
rnd-read: (groupid=2, jobs=4): err= 0: pid=1646
read : io=65,128KB, bw=541KB/s, iops=67, runt=120381msec
slat (usec): min=48, max=55,230, avg=167.95, stdev=248.50
clat (msec): min=74, max=4,229, avg=472.23, stdev=129.50
bw (KB/s) : min= 0, max= 203, per=25.34%, avg=137.08,
stdev=21.73
cpu : usr=0.85%, sys=2.19%, ctx=44001, majf=30, minf=3726
IO depths : 1=0.1%, 2=0.1%, 4=0.2%, 8=99.7%, 16=0.0%, 32=0.0%,
>=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
complete : 0=0.0%, 4=100.0%, 8=0.1%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
issued r/w: total=8141/0, short=0/0

lat (msec): 100=0.04%, 250=0.09%, 500=81.72%, 750=13.09%,
1000=2.97%
lat (msec): 2000=1.50%, >=2000=0.59%
rnd-write: (groupid=3, jobs=4): err= 0: pid=1646
write: io=200MB, bw=1,698KB/s, iops=212, runt=120331msec
slat (usec): min=48, max=215K, avg=2272.24, stdev=2283.09
clat (usec): min=762, max=14,617K, avg=147521.66, stdev=444146.36
bw (KB/s) : min= 1, max= 3960, per=56.86%, avg=964.90,
stdev=514.63
cpu : usr=1.25%, sys=4.20%, ctx=135229, majf=0, minf=10194
IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=99.9%, 16=0.0%, 32=0.0%,
>=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
complete : 0=0.0%, 4=100.0%, 8=0.1%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
issued r/w: total=0/25536, short=0/0
lat (usec): 1000=0.26%
lat (msec): 2=0.13%, 4=2.01%, 10=3.77%, 20=42.78%, 50=20.95%
lat (msec): 100=12.83%, 250=12.50%, 500=2.49%, 750=0.33%,
1000=0.12%
lat (msec): 2000=0.53%, >=2000=1.30%

Run status group 0 (all jobs):
READ: io=2,835MB, aggrb=24,191KB/s, minb=24,772KB/s, maxb=24,772KB/s,
mint=120021msec, maxt=120021msec

Run status group 1 (all jobs):
WRITE: io=1,721MB, aggrb=14,651KB/s, minb=15,003KB/s, maxb=15,003KB/s,
mint=120277msec, maxt=120277msec

Run status group 2 (all jobs):
READ: io=65,128KB, aggrb=541KB/s, minb=553KB/s, maxb=553KB/s,
mint=120381msec, maxt=120381msec

Run status group 3 (all jobs):
WRITE: io=200MB, aggrb=1,697KB/s, minb=1,738KB/s, maxb=1,738KB/s,
mint=120331msec, maxt=120331msec

Disk stats (read/write):
loop0: ios=0/0, merge=0/0, ticks=0/0, in_queue=0, util=0.00%

2.) kernel with enabled hot tracking

seq-read: (g=0): rw=read, bs=8K-8K/8K-8K, ioengine=libaio, iodepth=8
...
seq-read: (g=0): rw=read, bs=8K-8K/8K-8K, ioengine=libaio, iodepth=8
seq-write: (g=1): rw=write, bs=8K-8K/8K-8K, ioengine=libaio, iodepth=8
...
seq-write: (g=1): rw=write, bs=8K-8K/8K-8K, ioengine=libaio, iodepth=8
rnd-read: (g=2): rw=randread, bs=8K-8K/8K-8K, ioengine=libaio, iodepth=8
...
rnd-read: (g=2): rw=randread, bs=8K-8K/8K-8K, ioengine=libaio, iodepth=8
rnd-write: (g=3): rw=randwrite, bs=8K-8K/8K-8K, ioengine=libaio,
iodepth=8
...
rnd-write: (g=3): rw=randwrite, bs=8K-8K/8K-8K, ioengine=libaio,
iodepth=8
Starting 16 threads

seq-read: (groupid=0, jobs=4): err= 0: pid=2163
read : io=3,047MB, bw=26,001KB/s, iops=3,250, runt=120003msec
slat (usec): min=0, max=1,000K, avg=1141.34, stdev=2175.25
clat (usec): min=0, max=1,002K, avg=8610.96, stdev=6184.67
bw (KB/s) : min= 12, max=18896, per=25.28%, avg=6572.50,
stdev=713.22
cpu : usr=10.38%, sys=35.02%, ctx=1601418, majf=12, minf=2235
IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=100.0%, 16=0.0%, 32=0.0%,
>=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
complete : 0=0.0%, 4=100.0%, 8=0.1%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
issued r/w: total=390029/0, short=0/0
lat (usec): 2=1.49%, 50=0.01%, 100=0.01%, 250=0.01%, 500=0.01%
lat (usec): 750=0.01%, 1000=0.02%
lat (msec): 2=1.53%, 4=0.86%, 10=79.60%, 20=14.93%, 50=1.43%
lat (msec): 100=0.09%, 250=0.02%, 500=0.01%, 1000=0.01%, 2000=0.01%
seq-write: (groupid=1, jobs=4): err= 0: pid=2163
write: io=1,752MB, bw=14,950KB/s, iops=1,868, runt=120003msec
slat (usec): min=0, max=1,002K, avg=1697.47, stdev=3568.70
clat (usec): min=0, max=1,019K, avg=15630.94, stdev=21109.46
bw (KB/s) : min= 123, max=14693, per=26.31%, avg=3933.46,
stdev=779.57
cpu : usr=6.31%, sys=21.85%, ctx=894177, majf=4, minf=3407
IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=100.0%, 16=0.0%, 32=0.0%,
>=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
complete : 0=0.0%, 4=100.0%, 8=0.1%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
issued r/w: total=0/224253, short=0/0
lat (usec): 2=2.44%, 100=0.01%, 250=0.01%, 500=0.01%, 750=0.06%
lat (usec): 1000=0.23%
lat (msec): 2=0.73%, 4=2.00%, 10=40.15%, 20=42.68%, 50=10.25%
lat (msec): 100=0.95%, 250=0.14%, 500=0.10%, 750=0.12%, 1000=0.11%
lat (msec): 2000=0.03%
rnd-read: (groupid=2, jobs=4): err= 0: pid=2163
read : io=85,208KB, bw=709KB/s, iops=88, runt=120252msec
slat (usec): min=52, max=48,325, avg=204.43, stdev=596.50
clat (msec): min=1, max=2,754, avg=359.99, stdev=78.96
bw (KB/s) : min= 0, max= 249, per=25.17%, avg=178.20,
stdev=23.79
cpu : usr=1.00%, sys=2.64%, ctx=55704, majf=28, minf=2971
IO depths : 1=0.1%, 2=0.1%, 4=0.2%, 8=99.7%, 16=0.0%, 32=0.0%,
>=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
complete : 0=0.0%, 4=100.0%, 8=0.1%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
issued r/w: total=10651/0, short=0/0

lat (msec): 2=0.01%, 50=0.02%, 100=0.04%, 250=1.61%, 500=92.60%
lat (msec): 750=4.24%, 1000=0.68%, 2000=0.59%, >=2000=0.22%
rnd-write: (groupid=3, jobs=4): err= 0: pid=2163
write: io=247MB, bw=2,019KB/s, iops=252, runt=125287msec
slat (usec): min=51, max=286K, avg=2576.23, stdev=2882.30
clat (usec): min=698, max=8,156K, avg=123274.05, stdev=355311.20
bw (KB/s) : min= 1, max= 4848, per=57.62%, avg=1162.77,
stdev=560.79
cpu : usr=1.33%, sys=4.24%, ctx=163334, majf=0, minf=8588
IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=99.9%, 16=0.0%, 32=0.0%,
>=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
complete : 0=0.0%, 4=100.0%, 8=0.1%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
issued r/w: total=0/31616, short=0/0
lat (usec): 750=0.03%, 1000=0.15%
lat (msec): 2=0.06%, 4=2.15%, 10=3.57%, 20=48.23%, 50=22.43%
lat (msec): 100=11.48%, 250=9.14%, 500=1.04%, 750=0.16%, 1000=0.05%
lat (msec): 2000=0.09%, >=2000=1.42%

Run status group 0 (all jobs):
READ: io=3,047MB, aggrb=26,001KB/s, minb=26,625KB/s, maxb=26,625KB/s,
mint=120003msec, maxt=120003msec

Run status group 1 (all jobs):
WRITE: io=1,752MB, aggrb=14,949KB/s, minb=15,308KB/s, maxb=15,308KB/s,
mint=120003msec, maxt=120003msec

Run status group 2 (all jobs):
READ: io=85,208KB, aggrb=708KB/s, minb=725KB/s, maxb=725KB/s,
mint=120252msec, maxt=120252msec

Run status group 3 (all jobs):
WRITE: io=247MB, aggrb=2,018KB/s, minb=2,067KB/s, maxb=2,067KB/s,
mint=125287msec, maxt=125287msec

Disk stats (read/write):
loop0: ios=0/0, merge=0/0, ticks=0/0, in_queue=0, util=0.00%

4. compilebench test

1.) original kernel

using working directory /mnt/scratch/, 30 intial dirs 100 runs

native unpatched native-0 222MB in 87.48 seconds (2.54 MB/s)
native patched native-0 109MB in 24.89 seconds (4.41 MB/s)
native patched compiled native-0 691MB in 35.54 seconds (19.46 MB/s)
create dir kernel-0 222MB in 91.22 seconds (2.44 MB/s)
create dir kernel-1 222MB in 91.55 seconds (2.43 MB/s)
create dir kernel-2 222MB in 97.00 seconds (2.29 MB/s)
create dir kernel-3 222MB in 87.64 seconds (2.54 MB/s)
create dir kernel-4 222MB in 86.18 seconds (2.58 MB/s)
create dir kernel-5 222MB in 84.68 seconds (2.63 MB/s)
create dir kernel-6 222MB in 85.02 seconds (2.62 MB/s)
create dir kernel-7 222MB in 87.74 seconds (2.53 MB/s)
create dir kernel-8 222MB in 86.79 seconds (2.56 MB/s)
create dir kernel-9 222MB in 87.85 seconds (2.53 MB/s)
create dir kernel-10 222MB in 86.88 seconds (2.56 MB/s)
create dir kernel-11 222MB in 86.47 seconds (2.57 MB/s)
create dir kernel-12 222MB in 84.26 seconds (2.64 MB/s)
create dir kernel-13 222MB in 87.40 seconds (2.54 MB/s)
create dir kernel-14 222MB in 85.44 seconds (2.60 MB/s)
create dir kernel-15 222MB in 86.80 seconds (2.56 MB/s)
create dir kernel-16 222MB in 88.57 seconds (2.51 MB/s)
create dir kernel-17 222MB in 85.66 seconds (2.60 MB/s)
create dir kernel-18 222MB in 87.40 seconds (2.54 MB/s)
create dir kernel-19 222MB in 85.47 seconds (2.60 MB/s)
create dir kernel-20 222MB in 89.29 seconds (2.49 MB/s)
create dir kernel-21 222MB in 88.53 seconds (2.51 MB/s)
create dir kernel-22 222MB in 86.25 seconds (2.58 MB/s)
create dir kernel-23 222MB in 85.34 seconds (2.61 MB/s)
create dir kernel-24 222MB in 84.61 seconds (2.63 MB/s)
create dir kernel-25 222MB in 88.13 seconds (2.52 MB/s)
create dir kernel-26 222MB in 85.57 seconds (2.60 MB/s)
create dir kernel-27 222MB in 87.26 seconds (2.55 MB/s)
create dir kernel-28 222MB in 83.68 seconds (2.66 MB/s)
create dir kernel-29 222MB in 86.33 seconds (2.58 MB/s)
=== sdb ===
CPU 0: 9366376 events, 439049 KiB data
Total: 9366376 events (dropped 0), 439049 KiB data
patch dir kernel-7 109MB in 55.00 seconds (1.99 MB/s)
compile dir kernel-7 691MB in 37.15 seconds (18.62 MB/s)
compile dir kernel-14 680MB in 38.48 seconds (17.69 MB/s)
patch dir kernel-14 691MB in 93.31 seconds (7.41 MB/s)
read dir kernel-7 in 93.36 9.85 MB/s
read dir kernel-10 in 58.25 3.82 MB/s
create dir kernel-3116 222MB in 91.96 seconds (2.42 MB/s)
clean kernel-7 691MB in 5.16 seconds (134.03 MB/s)
read dir kernel-6 in 56.98 3.90 MB/s
stat dir kernel-2 in 19.42 seconds
compile dir kernel-2 680MB in 43.11 seconds (15.79 MB/s)
clean kernel-14 691MB in 6.27 seconds (110.30 MB/s)
clean kernel-2 680MB in 5.79 seconds (117.55 MB/s)
patch dir kernel-2 109MB in 71.22 seconds (1.54 MB/s)
stat dir kernel-2 in 16.06 seconds
create dir kernel-6231 222MB in 96.20 seconds (2.31 MB/s)
delete kernel-8 in 45.20 seconds
compile dir kernel-2 691MB in 38.58 seconds (17.93 MB/s)
create dir kernel-70151 222MB in 93.41 seconds (2.38 MB/s)
clean kernel-2 691MB in 5.09 seconds (135.87 MB/s)
create dir kernel-78184 222MB in 86.04 seconds (2.58 MB/s)
compile dir kernel-7 691MB in 37.60 seconds (18.39 MB/s)
create dir kernel-64250 222MB in 80.33 seconds (2.77 MB/s)
delete kernel-12 in 43.00 seconds
stat dir kernel-2 in 16.43 seconds
patch dir kernel-70151 109MB in 77.42 seconds (1.42 MB/s)
stat dir kernel-7 in 18.48 seconds
stat dir kernel-78184 in 18.62 seconds
compile dir kernel-2 691MB in 43.31 seconds (15.97 MB/s)
compile dir kernel-26 680MB in 50.37 seconds (13.51 MB/s)
stat dir kernel-7 in 21.52 seconds
create dir kernel-2717 222MB in 89.86 seconds (2.47 MB/s)
delete kernel-26 in 47.81 seconds
stat dir kernel-2 in 18.61 seconds
compile dir kernel-14 691MB in 46.66 seconds (14.82 MB/s)
compile dir kernel-70151 691MB in 39.19 seconds (17.65 MB/s)
create dir kernel-55376 222MB in 88.91 seconds (2.50 MB/s)
stat dir kernel-22 in 18.66 seconds
delete kernel-55376 in 37.71 seconds
patch dir kernel-27 109MB in 74.82 seconds (1.47 MB/s)
patch dir kernel-64250 109MB in 81.08 seconds (1.35 MB/s)
read dir kernel-6231 in 82.15 2.71 MB/s
patch dir kernel-9 109MB in 96.02 seconds (1.14 MB/s)
stat dir kernel-14 in 22.46 seconds
read dir kernel-29 in 58.10 3.83 MB/s
create dir kernel-57327 222MB in 93.92 seconds (2.37 MB/s)
stat dir kernel-14 in 21.92 seconds
compile dir kernel-27 691MB in 41.43 seconds (16.69 MB/s)
create dir kernel-64334 222MB in 89.31 seconds (2.49 MB/s)
patch dir kernel-1 109MB in 84.37 seconds (1.30 MB/s)
create dir kernel-16056 222MB in 94.93 seconds (2.34 MB/s)
clean kernel-7 691MB in 7.27 seconds (95.13 MB/s)
delete kernel-27 in 46.32 seconds
create dir kernel-51614 222MB in 88.91 seconds (2.50 MB/s)
clean kernel-14 691MB in 6.71 seconds (103.07 MB/s)
delete kernel-64250 in 43.60 seconds
stat dir kernel-2 in 24.25 seconds
clean kernel-70151 691MB in 6.20 seconds (111.55 MB/s)
delete kernel-14 in 40.74 seconds
read dir kernel-2 in 118.45 7.76 MB/s
create dir kernel-24150 222MB in 88.99 seconds (2.50 MB/s)
read dir kernel-9 in 83.70 2.73 MB/s
patch dir kernel-19 109MB in 76.06 seconds (1.44 MB/s)
clean kernel-2 691MB in 6.64 seconds (104.16 MB/s)
compile dir kernel-18 680MB in 47.33 seconds (14.38 MB/s)
compile dir kernel-2 691MB in 44.63 seconds (15.50 MB/s)
delete kernel-2 in 51.03 seconds
delete kernel-70151 in 45.96 seconds
stat dir kernel-1 in 17.56 seconds
read dir kernel-18 in 121.08 7.46 MB/s
clean kernel-18 680MB in 6.47 seconds (105.20 MB/s)
compile dir kernel-17 680MB in 52.10 seconds (13.06 MB/s)
read dir kernel-17 in 114.66 7.88 MB/s
stat dir kernel-18 in 30.36 seconds
stat dir kernel-64334 in 44.78 seconds
delete kernel-24150 in 44.79 seconds
delete kernel-17 in 47.64 seconds
stat dir kernel-1 in 19.87 seconds
compile dir kernel-7 691MB in 47.65 seconds (14.51 MB/s)
patch dir kernel-16 109MB in 100.96 seconds (1.09 MB/s)
stat dir kernel-7 in 21.35 seconds
create dir kernel-82195 222MB in 111.17 seconds (2.00 MB/s)
delete kernel-82195 in 40.79 seconds
stat dir kernel-3 in 19.51 seconds
patch dir kernel-2717 109MB in 94.55 seconds (1.16 MB/s)
patch dir kernel-5 109MB in 60.21 seconds (1.82 MB/s)
read dir kernel-2717 in 94.85 2.41 MB/s
delete kernel-29 in 40.51 seconds
clean kernel-7 691MB in 5.84 seconds (118.42 MB/s)
read dir kernel-4 in 57.91 3.84 MB/s
stat dir kernel-78184 in 19.65 seconds
patch dir kernel-0 109MB in 90.61 seconds (1.21 MB/s)
patch dir kernel-3 109MB in 75.67 seconds (1.45 MB/s)
create dir kernel-30226 222MB in 106.72 seconds (2.08 MB/s)
read dir kernel-19 in 83.79 2.72 MB/s
read dir kernel-9 in 82.64 2.76 MB/s
delete kernel-5 in 38.89 seconds
read dir kernel-7 in 59.70 3.82 MB/s
patch dir kernel-57327 109MB in 101.71 seconds (1.08 MB/s)
read dir kernel-11 in 59.83 3.72 MB/s

run complete:
==========================================================================
intial create total runs 30 avg 2.55 MB/s (user 13.94s sys 34.07s)
create total runs 14 avg 2.41 MB/s (user 13.83s sys 34.39s)
patch total runs 15 avg 1.79 MB/s (user 6.55s sys 34.71s)
compile total runs 14 avg 16.04 MB/s (user 2.65s sys 16.88s)
clean total runs 10 avg 113.53 MB/s (user 0.46s sys 3.14s)
read tree total runs 11 avg 3.30 MB/s (user 11.68s sys 24.50s)
read compiled tree total runs 4 avg 8.24 MB/s (user 13.67s sys 35.85s)
delete tree total runs 10 avg 42.12 seconds (user 6.76s sys 24.50s)
delete compiled tree total runs 4 avg 48.20 seconds (user 7.65s sys
28.60s)
stat tree total runs 11 avg 21.90 seconds (user 6.87s sys 6.34s)
stat compiled tree total runs 7 avg 21.23 seconds (user 7.65s sys 7.15s)

2.) kernel with enabled hot tracking

using working directory /mnt/scratch/, 30 intial dirs 100 runs
native unpatched native-0 222MB in 112.82 seconds (1.97 MB/s)
native patched native-0 109MB in 27.38 seconds (4.01 MB/s)
native patched compiled native-0 691MB in 40.42 seconds (17.11 MB/s)
create dir kernel-0 222MB in 92.88 seconds (2.39 MB/s)
create dir kernel-1 222MB in 98.56 seconds (2.26 MB/s)
create dir kernel-2 222MB in 107.27 seconds (2.07 MB/s)
create dir kernel-3 222MB in 92.81 seconds (2.40 MB/s)
create dir kernel-4 222MB in 90.30 seconds (2.46 MB/s)
create dir kernel-5 222MB in 91.57 seconds (2.43 MB/s)
create dir kernel-6 222MB in 91.92 seconds (2.42 MB/s)
create dir kernel-7 222MB in 90.16 seconds (2.47 MB/s)
create dir kernel-8 222MB in 94.71 seconds (2.35 MB/s)
create dir kernel-9 222MB in 91.79 seconds (2.42 MB/s)
create dir kernel-10 222MB in 92.14 seconds (2.41 MB/s)
create dir kernel-11 222MB in 88.59 seconds (2.51 MB/s)
create dir kernel-12 222MB in 92.15 seconds (2.41 MB/s)
create dir kernel-13 222MB in 91.54 seconds (2.43 MB/s)
create dir kernel-14 222MB in 91.15 seconds (2.44 MB/s)
create dir kernel-15 222MB in 90.54 seconds (2.46 MB/s)
create dir kernel-16 222MB in 92.23 seconds (2.41 MB/s)
create dir kernel-17 222MB in 89.88 seconds (2.47 MB/s)
create dir kernel-18 222MB in 94.65 seconds (2.35 MB/s)
create dir kernel-19 222MB in 89.99 seconds (2.47 MB/s)
create dir kernel-20 222MB in 90.35 seconds (2.46 MB/s)
create dir kernel-21 222MB in 90.92 seconds (2.45 MB/s)
create dir kernel-22 222MB in 90.76 seconds (2.45 MB/s)
create dir kernel-23 222MB in 90.04 seconds (2.47 MB/s)
create dir kernel-24 222MB in 89.60 seconds (2.48 MB/s)
create dir kernel-25 222MB in 91.52 seconds (2.43 MB/s)
create dir kernel-26 222MB in 90.45 seconds (2.46 MB/s)
create dir kernel-27 222MB in 92.72 seconds (2.40 MB/s)
create dir kernel-28 222MB in 90.37 seconds (2.46 MB/s)
create dir kernel-29 222MB in 89.60 seconds (2.48 MB/s)
=== sdb ===
CPU 0: 8878754 events, 416192 KiB data
Total: 8878754 events (dropped 0), 416192 KiB data
patch dir kernel-7 109MB in 61.00 seconds (1.80 MB/s)
compile dir kernel-7 691MB in 40.21 seconds (17.20 MB/s)
compile dir kernel-14 680MB in 45.97 seconds (14.81 MB/s)
patch dir kernel-14 691MB in 83.73 seconds (8.26 MB/s)
read dir kernel-7 in 88.66 10.37 MB/s
read dir kernel-10 in 56.44 3.94 MB/s
create dir kernel-3116 222MB in 91.58 seconds (2.43 MB/s)
clean kernel-7 691MB in 6.69 seconds (103.38 MB/s)
read dir kernel-6 in 61.07 3.64 MB/s
stat dir kernel-2 in 21.42 seconds
compile dir kernel-2 680MB in 44.55 seconds (15.28 MB/s)
clean kernel-14 691MB in 6.98 seconds (99.08 MB/s)
clean kernel-2 680MB in 6.12 seconds (111.21 MB/s)
patch dir kernel-2 109MB in 73.95 seconds (1.48 MB/s)
stat dir kernel-2 in 18.61 seconds
create dir kernel-6231 222MB in 100.84 seconds (2.21 MB/s)
delete kernel-8 in 40.38 seconds
compile dir kernel-2 691MB in 42.18 seconds (16.40 MB/s)
create dir kernel-70151 222MB in 96.34 seconds (2.31 MB/s)
clean kernel-2 691MB in 4.54 seconds (152.33 MB/s)
create dir kernel-78184 222MB in 94.71 seconds (2.35 MB/s)
compile dir kernel-7 691MB in 43.64 seconds (15.85 MB/s)
create dir kernel-64250 222MB in 87.65 seconds (2.54 MB/s)
delete kernel-12 in 38.58 seconds
stat dir kernel-2 in 17.48 seconds
patch dir kernel-70151 109MB in 79.82 seconds (1.37 MB/s)
stat dir kernel-7 in 25.76 seconds
stat dir kernel-78184 in 20.30 seconds
compile dir kernel-2 691MB in 40.93 seconds (16.90 MB/s)
compile dir kernel-26 680MB in 48.86 seconds (13.93 MB/s)
stat dir kernel-7 in 23.87 seconds
create dir kernel-2717 222MB in 98.71 seconds (2.25 MB/s)
delete kernel-26 in 45.60 seconds
stat dir kernel-2 in 22.62 seconds
compile dir kernel-14 691MB in 51.12 seconds (13.53 MB/s)
compile dir kernel-70151 691MB in 41.40 seconds (16.71 MB/s)
create dir kernel-55376 222MB in 94.61 seconds (2.35 MB/s)
stat dir kernel-22 in 22.11 seconds
delete kernel-55376 in 36.47 seconds
patch dir kernel-27 109MB in 76.74 seconds (1.43 MB/s)
patch dir kernel-64250 109MB in 86.43 seconds (1.27 MB/s)
read dir kernel-6231 in 85.10 2.61 MB/s
patch dir kernel-9 109MB in 97.67 seconds (1.12 MB/s)
stat dir kernel-14 in 24.80 seconds
read dir kernel-29 in 61.00 3.65 MB/s
create dir kernel-57327 222MB in 101.42 seconds (2.19 MB/s)
stat dir kernel-14 in 22.45 seconds
compile dir kernel-27 691MB in 48.19 seconds (14.35 MB/s)
create dir kernel-64334 222MB in 96.65 seconds (2.30 MB/s)
patch dir kernel-1 109MB in 88.32 seconds (1.24 MB/s)
create dir kernel-16056 222MB in 100.60 seconds (2.21 MB/s)
clean kernel-7 691MB in 8.20 seconds (84.34 MB/s)
delete kernel-27 in 48.53 seconds
create dir kernel-51614 222MB in 98.07 seconds (2.27 MB/s)
clean kernel-14 691MB in 6.82 seconds (101.41 MB/s)
delete kernel-64250 in 44.01 seconds
stat dir kernel-2 in 26.37 seconds
clean kernel-70151 691MB in 6.21 seconds (111.37 MB/s)
delete kernel-14 in 41.74 seconds
read dir kernel-2 in 122.71 7.50 MB/s
create dir kernel-24150 222MB in 99.01 seconds (2.25 MB/s)
read dir kernel-9 in 78.29 2.91 MB/s
patch dir kernel-19 109MB in 77.45 seconds (1.42 MB/s)
clean kernel-2 691MB in 5.94 seconds (116.43 MB/s)
compile dir kernel-18 680MB in 49.17 seconds (13.84 MB/s)
compile dir kernel-2 691MB in 47.20 seconds (14.65 MB/s)
delete kernel-2 in 48.01 seconds
delete kernel-70151 in 47.60 seconds
stat dir kernel-1 in 21.80 seconds
read dir kernel-18 in 109.98 8.21 MB/s
clean kernel-18 680MB in 7.78 seconds (87.49 MB/s)
compile dir kernel-17 680MB in 54.39 seconds (12.51 MB/s)
read dir kernel-17 in 108.52 8.32 MB/s
stat dir kernel-18 in 19.48 seconds
stat dir kernel-64334 in 22.04 seconds
delete kernel-24150 in 44.36 seconds
delete kernel-17 in 49.09 seconds
stat dir kernel-1 in 18.16 seconds
compile dir kernel-7 691MB in 48.90 seconds (14.14 MB/s)
patch dir kernel-16 109MB in 103.71 seconds (1.06 MB/s)
stat dir kernel-7 in 21.94 seconds
create dir kernel-82195 222MB in 110.82 seconds (2.01 MB/s)
delete kernel-82195 in 38.64 seconds
stat dir kernel-3 in 22.88 seconds
patch dir kernel-2717 109MB in 92.23 seconds (1.19 MB/s)
patch dir kernel-5 109MB in 64.95 seconds (1.69 MB/s)
read dir kernel-2717 in 97.88 2.33 MB/s
delete kernel-29 in 40.59 seconds
clean kernel-7 691MB in 5.09 seconds (135.87 MB/s)
read dir kernel-4 in 59.42 3.74 MB/s
stat dir kernel-78184 in 20.24 seconds
patch dir kernel-0 109MB in 95.95 seconds (1.14 MB/s)
patch dir kernel-3 109MB in 62.86 seconds (1.74 MB/s)
create dir kernel-30226 222MB in 106.81 seconds (2.08 MB/s)
read dir kernel-19 in 81.32 2.81 MB/s
read dir kernel-9 in 74.65 3.06 MB/s
delete kernel-5 in 42.04 seconds
read dir kernel-7 in 61.95 3.68 MB/s
patch dir kernel-57327 109MB in 97.85 seconds (1.12 MB/s)
read dir kernel-11 in 58.85 3.78 MB/s

run complete:
==========================================================================
intial create total runs 30 avg 2.42 MB/s (user 13.60s sys 36.18s)
create total runs 14 avg 2.27 MB/s (user 13.66s sys 36.94s)
patch total runs 15 avg 1.82 MB/s (user 6.62s sys 36.93s)
compile total runs 14 avg 15.01 MB/s (user 2.76s sys 18.29s)
clean total runs 10 avg 110.29 MB/s (user 0.46s sys 3.21s)
read tree total runs 11 avg 3.29 MB/s (user 11.04s sys 28.65s)
read compiled tree total runs 4 avg 8.60 MB/s (user 13.16s sys 41.32s)
delete tree total runs 10 avg 41.44 seconds (user 6.43s sys 25.19s)
delete compiled tree total runs 4 avg 47.81 seconds (user 7.18s sys
29.27s)
stat tree total runs 11 avg 20.41 seconds (user 6.39s sys 7.45s)
stat compiled tree total runs 7 avg 23.97 seconds (user 7.24s sys 8.74s)

On Fri, 2012-11-16 at 17:51 +0800, zwu.kernel@xxxxxxxxx wrote:
> From: Zhi Yong Wu <wuzhy@xxxxxxxxxxxxxxxxxx>
>
> HI, guys,
>
> Any comments or ideas are appreciated, thanks.
>
> NOTE:
>
> The patchset can be obtained via my kernel dev git on github:
> git://github.com/wuzhy/kernel.git hot_tracking
> If you're interested, you can also review them via
> https://github.com/wuzhy/kernel/commits/hot_tracking
>
> For more info, please check hot_tracking.txt in Documentation
>
> TODO List:
>
> 1.) Need to do scalability or performance tests. - Required
> 2.) Need one simpler but efficient temp calculation function
> 3.) How to save the file temperature among the umount to be able to
> preserve the file tempreture after reboot - Optional
>
> Changelog:
>
> - Solved 64 bits inode number issue. [David Sterba]
> - Embed struct hot_type in struct file_system_type [Darrick J. Wong]
> - Cleanup Some issues [David Sterba]
> - Use a static hot debugfs root [Greg KH]
> - Rewritten debugfs support based on seq_file operation. [Dave Chinner]
> - Refactored workqueue support. [Dave Chinner]
> - Turn some Micro into be tunable [Zhiyong, Zheng Liu]
> TIME_TO_KICK, and HEAT_UPDATE_DELAY
> - Introduce hot func registering framework [Zhiyong]
> - Remove global variable for hot tracking [Zhiyong]
> - Add xfs hot tracking support [Dave Chinner]
> - Add ext4 hot tracking support [Zheng Liu]
> - Cleanedup a lot of other issues [Dave Chinner]
> - Added memory shrinker [Dave Chinner]
> - Converted to one workqueue to update map info periodically [Dave Chinner]
> - Cleanedup a lot of other issues [Dave Chinner]
> - Reduce new files and put all in fs/hot_tracking.[ch] [Dave Chinner]
> - Add btrfs hot tracking support [Zhiyong]
> - The first three patches can probably just be flattened into one.
> [Marco Stornelli , Dave Chinner]
>
> Zhi Yong Wu (16):
> vfs: introduce some data structures
> vfs: add init and cleanup functions
> vfs: add I/O frequency update function
> vfs: add two map arrays
> vfs: add hooks to enable hot tracking
> vfs: add temp calculation function
> vfs: add map info update function
> vfs: add aging function
> vfs: add one work queue
> vfs: add FS hot type support
> vfs: register one shrinker
> vfs: add one ioctl interface
> vfs: add debugfs support
> proc: add two hot_track proc files
> btrfs: add hot tracking support
> vfs: add documentation
>
> Documentation/filesystems/00-INDEX | 2 +
> Documentation/filesystems/hot_tracking.txt | 263 ++++++
> fs/Makefile | 2 +-
> fs/btrfs/ctree.h | 1 +
> fs/btrfs/super.c | 22 +-
> fs/compat_ioctl.c | 5 +
> fs/dcache.c | 2 +
> fs/direct-io.c | 6 +
> fs/hot_tracking.c | 1306 ++++++++++++++++++++++++++++
> fs/hot_tracking.h | 52 ++
> fs/ioctl.c | 74 ++
> include/linux/fs.h | 5 +
> include/linux/hot_tracking.h | 152 ++++
> kernel/sysctl.c | 14 +
> mm/filemap.c | 6 +
> mm/page-writeback.c | 12 +
> mm/readahead.c | 7 +
> 17 files changed, 1929 insertions(+), 2 deletions(-)
> create mode 100644 Documentation/filesystems/hot_tracking.txt
> create mode 100644 fs/hot_tracking.c
> create mode 100644 fs/hot_tracking.h
> create mode 100644 include/linux/hot_tracking.h
>

--
Regards,

Zhi Yong Wu

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