linux-kernel - Re: [PATCH v8 15/19] locking/rwsem: Adaptive disabling of reader optimistic spinning

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Message-ID: <6f7371cf-c5ea-282a-c8ce-a95d8f339cd1@redhat.com>
Date:   Tue, 4 Jun 2019 13:29:14 -0400
From:   Waiman Long <longman@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>, Will Deacon <will.deacon@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org, Davidlohr Bueso <dave@...olabs.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        huang ying <huang.ying.caritas@...il.com>
Subject: Re: [PATCH v8 15/19] locking/rwsem: Adaptive disabling of reader
 optimistic spinning

On 6/4/19 5:14 AM, Peter Zijlstra wrote:
> On Mon, May 20, 2019 at 04:59:14PM -0400, Waiman Long wrote:
>> On a 2-socket 40-core 80-thread Skylake system, the page_fault1 test of
>> the will-it-scale benchmark was run with various number of threads. The
>> number of operations done before reader optimistic spinning patches,
>> this patch and after this patch were:
>>
>>   Threads  Before rspin  Before patch  After patch    %change
>>   -------  ------------  ------------  -----------    -------
>>     20        5541068      5345484       5455667    -3.5%/ +2.1%
>>     40       10185150      7292313       9219276   -28.5%/+26.4%
>>     60        8196733      6460517       7181209   -21.2%/+11.2%
>>     80        9508864      6739559       8107025   -29.1%/+20.3%
> 'rspin' is patch 12 in this series, right?

Yes, I should have spell out the patch name.

-Longman