[sched] perf-stat.cpu-migrations changes in dd write test

From: fengguang . wu
Date: Sat Dec 21 2013 - 19:31:15 EST

Alex,

We noticed some perf-stat.cpu-migrations changes by your commit

6eb8b571283e64e96ca1a91aad085f9e08f857f0 is the first bad commit
commit 6eb8b571283e64e96ca1a91aad085f9e08f857f0
Author: Alex Shi <alex.shi@xxxxxxxxxx>
Date: Tue Nov 19 20:29:51 2013 +0800

sched: remove rq->cpu_load[load_idx] array

Since load_idx effect removed in load balance, we don't need the
load_idx decays in scheduler. that will save some process in sched_tick
and others places.

Signed-off-by: Alex Shi <alex.shi@xxxxxxxxxx>


Here are the changed stats comparing to its parent commit:

1de157d718f6494 6eb8b571283e64e96ca1
--------------- -------------------------
37779 ~40% +115.2% 81288 ~50% kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd
37779 +115.2% 81288 TOTAL proc-vmstat.pgscan_direct_normal

kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd: proc-vmstat.pgscan_direct_normal

160000 ++----------------------------------------------------------------+
| |
140000 ++ O
| |
120000 ++ |
| O |
100000 ++ |
| |
80000 ++ O |
| ..*
60000 ++ .... |
| .... |
40000 *+............... O .... |
O *............... ........*. |
20000 ++-------------------------------*--------------------------------+


1de157d718f6494 6eb8b571283e64e96ca1
--------------- -------------------------
121579 ~ 6% -50.8% 59852 ~13% kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd
121579 -50.8% 59852 TOTAL softirqs.SCHED

kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd: softirqs.SCHED

140000 ++----------------------------------------------------------------+
130000 ++ ....*........... ....*....... |
| ........ .... ........ ...... |
120000 *+... *.... ..|
110000 ++ *
| |
100000 ++ |
90000 ++ |
80000 ++ |
| |
70000 ++ O O |
60000 ++ O |
| O
50000 O+ |
40000 ++----------------------------------------------------------------+


1de157d718f6494 6eb8b571283e64e96ca1
--------------- -------------------------
5636 ~ 4% -22.1% 4392 ~17% kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd
5636 -22.1% 4392 TOTAL proc-vmstat.nr_tlb_remote_flush

kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd: proc-vmstat.nr_tlb_remote_flush

6500 ++------------------------------------------------------------------+
| |
6000 ++ ........*............ |
*........ .... |
5500 ++ O *................*................|
| *
5000 ++ O |
| |
4500 ++ O |
| |
4000 ++ |
| O
3500 O+ |
| |
3000 ++------------------------------------------------------------------+


1de157d718f6494 6eb8b571283e64e96ca1
--------------- -------------------------
5679 ~ 4% -21.9% 4437 ~17% kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd
5679 -21.9% 4437 TOTAL proc-vmstat.nr_tlb_remote_flush_received



6500 ++------------------------------------------------------------------+
| |
6000 ++ ........*........ |
*........ ...... |
| .. ........*................|
5500 ++ O *........ *
| |
5000 ++ O |
| |
4500 ++ O |
| |
| |
4000 ++ |
| O
3500 O+------------------------------------------------------------------+


1de157d718f6494 6eb8b571283e64e96ca1
--------------- -------------------------
167 ~11% +19.4% 200 ~ 4% kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd
167 +19.4% 200 TOTAL uptime.idle

kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd: uptime.idle

220 ++-------------------------------------------------------------------+
| O
210 ++ |
200 O+ O |
| ..*..... O |
190 ++ .... O ... |
180 ++ .... .... |
| .... .... |
170 *+. . .*
160 ++ *...... .... |
| .... ... |
150 ++ .... ... |
140 ++ .. .... |
| *. |
130 ++-------------------------------------------------------------------+


1de157d718f6494 6eb8b571283e64e96ca1
--------------- -------------------------
154781 ~ 5% -66.8% 51449 ~ 8% kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd
154781 -66.8% 51449 TOTAL perf-stat.cpu-migrations

kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd: perf-stat.cpu-migrations

180000 ++----------------------------------------------------------------+
| ....*........... |
160000 ++ ........ .... ........*...............|
*.... *........ *
140000 ++ |
| |
120000 ++ |
| |
100000 ++ |
| |
80000 ++ |
| |
60000 ++ O |
| O O O
40000 O+----------------------------------------------------------------+


1de157d718f6494 6eb8b571283e64e96ca1
--------------- -------------------------
1943 ~ 3% -7.8% 1792 ~ 4% kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd
1943 -7.8% 1792 TOTAL vmstat.system.cs

kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd: vmstat.system.cs

2050 ++------------------------------------------------------------------+
| ........*................*..... |
2000 ++ .*........ ... |
1950 ++ .... ... |
| ... .... |
1900 ++ ... .|
1850 ++.... O O *
*. |
1800 ++ O O
1750 ++ |
| |
1700 ++ |
1650 O+ |
| |
1600 ++------------------------------------------------------------------+


1de157d718f6494 6eb8b571283e64e96ca1
--------------- -------------------------
1216177 ~ 3% -9.4% 1101605 ~ 7% kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd
1216177 -9.4% 1101605 TOTAL perf-stat.context-switches

kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd: perf-stat.context-switches

1.3e+06 ++--------------------------------------------------------------+
| ..*............... |
1.25e+06 ++ ...... *...............*....... |
| ..... ...... |
1.2e+06 *+. O ..|
1.15e+06 ++ O *
| O |
1.1e+06 ++ |
| O
1.05e+06 ++ |
1e+06 ++ |
| |
950000 O+ |
| |
900000 ++--------------------------------------------------------------+


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