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SubjectRe: [PATCH v2 0/11] remove cpu_load in rq
On 02/17/2014 09:55 AM, Alex Shi wrote:
> The cpu_load decays on time according past cpu load of rq. The sched_avg also decays tasks' load on time. Now we has 2 kind decay for cpu_load. That is a kind of redundancy. And increase the system load by decay calculation. This patch try to remove the cpu_load decay.
>
> There are 5 load_idx used for cpu_load in sched_domain. busy_idx and idle_idx are not zero usually, but newidle_idx, wake_idx and forkexec_idx are all zero on every arch. A shortcut to remove cpu_Load decay in the first patch. just one line patch for this change.
>
> V2,
> 1, This version do some tuning on load bias of target load, to maximum match current code logical.
> 2, Got further to remove the cpu_load in rq.
> 3, Revert the patch 'Limit sd->*_idx range on sysctl' since no needs
>
> Any testing/comments are appreciated.

Tested on 12-cpu-x86 box with tip/master, ebizzy and hackbench
works fine, show little improvements for each time's testing.

ebizzy default:

BASE PATCHED

32506 records/s |32785 records/s
real 10.00 s |real 10.00 s
user 50.32 s |user 49.66 s
sys 69.46 s |sys 70.19 s
32552 records/s |32946 records/s
real 10.00 s |real 10.00 s
user 50.11 s |user 50.70 s
sys 69.68 s |sys 69.15 s
32265 records/s |32824 records/s
real 10.00 s |real 10.00 s
user 49.46 s |user 50.46 s
sys 70.28 s |sys 69.34 s
32489 records/s |32735 records/s
real 10.00 s |real 10.00 s
user 49.67 s |user 50.21 s
sys 70.12 s |sys 69.54 s
32490 records/s |32662 records/s
real 10.00 s |real 10.00 s
user 50.01 s |user 50.07 s
sys 69.79 s |sys 69.68 s
32471 records/s |32784 records/s
real 10.00 s |real 10.00 s
32471 records/s |32784 records/s
real 10.00 s |real 10.00 s
user 49.73 s |user 49.88 s
sys 70.07 s |sys 69.87 s
32596 records/s |32783 records/s
real 10.00 s |real 10.00 s
user 49.81 s |user 49.42 s
sys 70.00 s |sys 70.30 s

hackbench 10000 loops:

BASE PATCHED

Running with 48*40 (== 1920) tasks. |Running with 48*40 (== 1920) tasks.
Time: 30.934 |Time: 29.965
Running with 48*40 (== 1920) tasks. |Running with 48*40 (== 1920) tasks.
Time: 31.603 |Time: 30.410
Running with 48*40 (== 1920) tasks. |Running with 48*40 (== 1920) tasks.
Time: 31.724 |Time: 30.627
Running with 48*40 (== 1920) tasks. |Running with 48*40 (== 1920) tasks.
Time: 31.648 |Time: 30.596
Running with 48*40 (== 1920) tasks. |Running with 48*40 (== 1920) tasks.
Time: 31.799 |Time: 30.763
Running with 48*40 (== 1920) tasks. |Running with 48*40 (== 1920) tasks.
Time: 31.847 |Time: 30.532
Running with 48*40 (== 1920) tasks. |Running with 48*40 (== 1920) tasks.
Time: 31.828 |Time: 30.871
Running with 24*40 (== 960) tasks. |Running with 24*40 (== 960) tasks.
Time: 15.768 |Time: 15.284
Running with 24*40 (== 960) tasks. |Running with 24*40 (== 960) tasks.
Time: 15.720 |Time: 15.228
Running with 24*40 (== 960) tasks. |Running with 24*40 (== 960) tasks.
Time: 15.819 |Time: 15.373
Running with 24*40 (== 960) tasks. |Running with 24*40 (== 960) tasks.
Time: 15.888 |Time: 15.184
Running with 24*40 (== 960) tasks. |Running with 24*40 (== 960) tasks.
Time: 15.888 |Time: 15.184
Running with 24*40 (== 960) tasks. |Running with 24*40 (== 960) tasks.
Time: 15.660 |Time: 15.525
Running with 24*40 (== 960) tasks. |Running with 24*40 (== 960) tasks.
Time: 15.934 |Time: 15.337
Running with 24*40 (== 960) tasks. |Running with 24*40 (== 960) tasks.
Time: 15.669 |Time: 15.357
Running with 12*40 (== 480) tasks. |Running with 12*40 (== 480) tasks.
Time: 7.699 |Time: 7.458
Running with 12*40 (== 480) tasks. |Running with 12*40 (== 480) tasks.
Time: 7.693 |Time: 7.498
Running with 12*40 (== 480) tasks. |Running with 12*40 (== 480) tasks.
Time: 7.705 |Time: 7.439
Running with 12*40 (== 480) tasks. |Running with 12*40 (== 480) tasks.
Time: 7.664 |Time: 7.553
Running with 12*40 (== 480) tasks. |Running with 12*40 (== 480) tasks.
Time: 7.603 |Time: 7.470
Running with 12*40 (== 480) tasks. |Running with 12*40 (== 480) tasks.
Time: 7.651 |Time: 7.491
Running with 12*40 (== 480) tasks. |Running with 12*40 (== 480) tasks.
Time: 7.647 |Time: 7.535
Running with 12*40 (== 480) tasks. |Running with 12*40 (== 480) tasks.
Time: 7.647 |Time: 7.535
Running with 6*40 (== 240) tasks. |Running with 6*40 (== 240) tasks.
Time: 6.054 |Time: 5.293
Running with 6*40 (== 240) tasks. |Running with 6*40 (== 240) tasks.
Time: 5.417 |Time: 5.701
Running with 6*40 (== 240) tasks. |Running with 6*40 (== 240) tasks.
Time: 5.287 |Time: 5.240
Running with 6*40 (== 240) tasks. |Running with 6*40 (== 240) tasks.
Time: 5.594 |Time: 5.571
Running with 6*40 (== 240) tasks. |Running with 6*40 (== 240) tasks.
Time: 5.347 |Time: 6.136
Running with 6*40 (== 240) tasks. |Running with 6*40 (== 240) tasks.
Time: 5.430 |Time: 5.323
Running with 6*40 (== 240) tasks. |Running with 6*40 (== 240) tasks.
Time: 5.691 |Time: 5.481
Running with 1*40 (== 40) tasks. |Running with 1*40 (== 40) tasks.
Time: 1.192 |Time: 1.140
Running with 1*40 (== 40) tasks. |Running with 1*40 (== 40) tasks.
Time: 1.190 |Time: 1.125
Running with 1*40 (== 40) tasks. |Running with 1*40 (== 40) tasks.
Time: 1.189 |Time: 1.013
Running with 1*40 (== 40) tasks. |Running with 1*40 (== 40) tasks.
Time: 1.189 |Time: 1.013
Running with 1*40 (== 40) tasks. |Running with 1*40 (== 40) tasks.
Time: 1.163 |Time: 1.060
Running with 1*40 (== 40) tasks. |Running with 1*40 (== 40) tasks.
Time: 1.186 |Time: 1.131
Running with 1*40 (== 40) tasks. |Running with 1*40 (== 40) tasks.
Time: 1.175 |Time: 1.125
Running with 1*40 (== 40) tasks. |Running with 1*40 (== 40) tasks.
Time: 1.157 |Time: 0.998


BTW, I got panic while rebooting, but should not caused by
this patch set, will recheck and post the report later.

Regards,
Michael Wang



INFO: rcu_sched detected stalls on CPUs/tasks: { 7} (detected by 1, t=21002 jiffies, g=6707, c=6706, q=227)
Kernel panic - not syncing: Watchdog detected hard LOCKUP on cpu 7
CPU: 7 PID: 1040 Comm: bioset Not tainted 3.14.0-rc2-test+ #402
Hardware name: IBM System x3650 M3 -[794582A]-/94Y7614, BIOS -[D6E154AUS-1.13]- 09/23/2011
0000000000000000 ffff88097f2e7bd8 ffffffff8156b38a 0000000000004f27
ffffffff817ecb90 ffff88097f2e7c58 ffffffff81561d8d ffff88097f2e7c08
ffffffff00000010 ffff88097f2e7c68 ffff88097f2e7c08 ffff88097f2e7c78
Call Trace:
<NMI> [<ffffffff8156b38a>] dump_stack+0x46/0x58
[<ffffffff81561d8d>] panic+0xbe/0x1ce
[<ffffffff810e6b03>] watchdog_overflow_callback+0xb3/0xc0
[<ffffffff8111e928>] __perf_event_overflow+0x98/0x220
[<ffffffff8111f224>] perf_event_overflow+0x14/0x20
[<ffffffff8101eef2>] intel_pmu_handle_irq+0x1c2/0x2c0
[<ffffffff81089af9>] ? load_balance+0xf9/0x590
[<ffffffff81089b0d>] ? load_balance+0x10d/0x590
[<ffffffff81562ac2>] ? printk+0x4d/0x4f
[<ffffffff815763b4>] perf_event_nmi_handler+0x34/0x60
[<ffffffff81575b6e>] nmi_handle+0x7e/0x140
[<ffffffff81575d1a>] default_do_nmi+0x5a/0x250
[<ffffffff81575fa0>] do_nmi+0x90/0xd0
[<ffffffff815751e7>] end_repeat_nmi+0x1e/0x2e
[<ffffffff81089340>] ? find_busiest_group+0x120/0x7e0
[<ffffffff81089340>] ? find_busiest_group+0x120/0x7e0
[<ffffffff81089340>] ? find_busiest_group+0x120/0x7e0
<<EOE>> [<ffffffff81089b7c>] load_balance+0x17c/0x590
[<ffffffff8108a49f>] idle_balance+0x10f/0x1c0
[<ffffffff8108a66e>] pick_next_task_fair+0x11e/0x2a0
[<ffffffff8107ba53>] ? dequeue_task+0x73/0x90
[<ffffffff815712b7>] __schedule+0x127/0x670
[<ffffffff815718d9>] schedule+0x29/0x70
[<ffffffff8104e3b5>] do_exit+0x2a5/0x470
[<ffffffff81066c90>] ? process_scheduled_works+0x40/0x40
[<ffffffff8106e78a>] kthread+0xba/0xe0
[<ffffffff8106e6d0>] ? flush_kthread_worker+0xb0/0xb0
[<ffffffff8157d0ec>] ret_from_fork+0x7c/0xb0
[<ffffffff8106e6d0>] ? flush_kthread_worker+0xb0/0xb0
Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffff9fffffff)


>
> This patch rebase on latest tip/master.
> The git tree for this patchset at:
> git@github.com:alexshi/power-scheduling.git noload
>
> Thanks
> Alex
>
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