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Date: Mon, 21 Apr 2014 14:28:21 +0800
From: Jet Chen <jet.chen@...el.com>
To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
CC: LKML <linux-kernel@...r.kernel.org>, lkp@...org,
Fengguang Wu <fengguang.wu@...el.com>
Subject: [sched,rcu] 9234566d3a3: +1.6% will-it-scale.scalability, +1302.6%
time.involuntary_context_switches
Hi Paul,
we noticed the below changes on
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git torture.2014.04.18a
commit 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 ("sched,rcu: Make cond_resched() report RCU quiescent states")
Comparison 1 - parent commit of 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 vs 9234566d3a36c0aead8852e3c2ca94cd8ebfe219
e119454e74a852f 9234566d3a36c0aead8852e3c
--------------- -------------------------
1035948 ~ 0% +1.6% 1052990 ~ 0% TOTAL will-it-scale.per_thread_ops
1271322 ~ 0% +1.8% 1294004 ~ 0% TOTAL will-it-scale.per_process_ops
0.63 ~ 0% -5.2% 0.60 ~ 0% TOTAL will-it-scale.scalability
22470 ~ 2% +1302.6% 315168 ~ 2% TOTAL time.involuntary_context_switches
84265 ~ 5% +1047.1% 966581 ~ 1% TOTAL interrupts.IWI
1828 ~44% +189.6% 5295 ~13% TOTAL time.voluntary_context_switches
5337 ~ 1% +82.1% 9720 ~ 1% TOTAL vmstat.system.cs
118599 ~ 0% -30.4% 82545 ~ 0% TOTAL interrupts.0:IO-APIC-edge.timer
224021 ~ 4% +34.7% 301858 ~ 2% TOTAL interrupts.RES
25148 ~ 0% +7.0% 26917 ~ 0% TOTAL vmstat.system.in
7063439 ~ 0% -5.2% 6694536 ~ 0% TOTAL interrupts.LOC
188866 ~ 0% -3.1% 183008 ~ 0% TOTAL interrupts.NMI
188866 ~ 0% -3.1% 183008 ~ 0% TOTAL interrupts.PMI
3720 ~ 0% -1.5% 3665 ~ 0% TOTAL time.system_time
1215 ~ 0% -1.4% 1198 ~ 0% TOTAL time.percent_of_cpu_this_job_got
Comparison 2 - b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 vs 9234566d3a36c0aead8852e3c2ca94cd8ebfe219
Fengguang has reported stats changes about b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 to you days ago.
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2014.04.14a
commit b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 ("sched,rcu: Make cond_resched() report RCU quiescent states")
Let's have a compare here.
b84c4e08143c98d 9234566d3a36c0aead8852e3c
--------------- -------------------------
809309 ~ 0% -2.6% 788400 ~ 0% TOTAL will-it-scale.per_process_ops
0.61 ~ 0% -1.9% 0.60 ~ 0% TOTAL will-it-scale.scalability
434080 ~ 0% -1.5% 427643 ~ 0% TOTAL will-it-scale.per_thread_ops
4 ~11% +1.2e+05% 5249 ~ 2% TOTAL interrupts.IWI
607 ~ 7% +28.0% 778 ~14% TOTAL interrupts.47:PCI-MSI-edge.eth0
12349 ~ 2% -14.6% 10548 ~ 1% TOTAL interrupts.0:IO-APIC-edge.timer
3078 ~ 3% +20.9% 3722 ~ 6% TOTAL interrupts.RES
Comparison 3 - parent commit of b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 vs b84c4e08143c98dad4b4d139f08db0b98b0d3ec4
Duplicated with Fengguang's report. Help you to see these info in a page :)
ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
676264 ~ 0% +3.3% 698461 ~ 0% TOTAL will-it-scale.per_thread_ops
1174547 ~ 0% +3.0% 1209307 ~ 0% TOTAL will-it-scale.per_process_ops
1.67 ~ 0% -2.3% 1.63 ~ 0% TOTAL will-it-scale.scalability
10522 ~ 2% +921.2% 107463 ~ 1% TOTAL time.involuntary_context_switches
77671 ~ 3% +67.0% 129688 ~ 3% TOTAL interrupts.RES
99502 ~ 0% -27.8% 71813 ~ 0% TOTAL interrupts.0:IO-APIC-edge.timer
2554 ~ 0% +49.1% 3809 ~ 1% TOTAL vmstat.system.cs
11524 ~ 0% -2.3% 11259 ~ 0% TOTAL vmstat.system.in
213 ~ 0% -4.3% 204 ~ 0% TOTAL time.system_time
74 ~ 0% -4.1% 71 ~ 0% TOTAL time.percent_of_cpu_this_job_got
3495099 ~ 0% -3.1% 3387173 ~ 0% TOTAL interrupts.LOC
Thanks,
Jet
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