linux-kernel - Re: [PATCH 3/8] srcu: Use local_lock() for per-CPU struct srcu

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Date:   Sun, 24 May 2020 21:03:56 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Josh Triplett <josh@...htriplett.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        rcu@...r.kernel.org
Subject: Re: [PATCH 3/8] srcu: Use local_lock() for per-CPU struct srcu_data
 access

On 2020-05-23 17:08:32 [+0200], To Paul E. McKenney wrote:
> On 2020-05-22 10:39:53 [-0700], Paul E. McKenney wrote:
> > It looks good to me, but I have not yet tested it.  (Happy to let you
> > take the first crack at rcutorture in any case, scenarios SRCU-P and
> > SRCU-N.)
> 
> on it.

|tools/testing/selftests/rcutorture/bin/kvm.sh --cpus 32 --duration 240 --configs 8*SRCU-N
|SRCU-N ------- 2127126 GPs (147.717/s) [srcu: g26566592 f0x0 ]
|SRCU-N.2 ------- 2123520 GPs (147.467/s) [srcu: g26563696 f0x0 ]
|SRCU-N.3 ------- 2122181 GPs (147.374/s) [srcu: g26549140 f0x0 ]
|SRCU-N.4 ------- 2126099 GPs (147.646/s) [srcu: g26564232 f0x0 ]
|SRCU-N.5 ------- 2127107 GPs (147.716/s) [srcu: g26590168 f0x0 ]
|SRCU-N.6 ------- 2125489 GPs (147.603/s) [srcu: g26545616 f0x0 ]
|SRCU-N.7 ------- 2128308 GPs (147.799/s) [srcu: g26591524 f0x0 ]
|SRCU-N.8 ------- 2126432 GPs (147.669/s) [srcu: g26586816 f0x0 ]
|
|tools/testing/selftests/rcutorture/bin/kvm.sh --cpus 32 --duration 240 --configs 8*SRCU-P
|SRCU-P ------- 565751 GPs (39.2883/s) [srcud: g5034676 f0x0 ]
|SRCU-P.2 ------- 569508 GPs (39.5492/s) [srcud: g5062872 f0x0 ]
|SRCU-P.3 ------- 574240 GPs (39.8778/s) [srcud: g5098488 f0x0 ]
|SRCU-P.4 ------- 564376 GPs (39.1928/s) [srcud: g5031244 f0x0 ]
|SRCU-P.5 ------- 563705 GPs (39.1462/s) [srcud: g5024720 f0x0 ]
|SRCU-P.6 ------- 565043 GPs (39.2391/s) [srcud: g5030272 f0x0 ]
|SRCU-P.7 ------- 567450 GPs (39.4062/s) [srcud: g5046392 f0x0 ]
|SRCU-P.8 ------- 566496 GPs (39.34/s) [srcud: g5039396 f0x0 ]

Results at
   https://breakpoint.cc/res.tar.xz

Sebastian