linux-kernel - Re: [PATCH-tip 3/3] locking/rwsem: Stop active read lock ASAP

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Message-ID: <20170226185816.GF5126@linux-80c1.suse>
Date:   Sun, 26 Feb 2017 10:58:16 -0800
From:   Davidlohr Bueso <dave@...olabs.net>
To:     Waiman Long <longman@...hat.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH-tip 3/3] locking/rwsem: Stop active read lock ASAP

On Wed, 22 Feb 2017, Waiman Long wrote:

>On a 2-socket 36-core 72-thread x86-64 E5-2699 v3 system, a rwsem
>microbenchmark was run with 36 locking threads (one/core) doing 100k
>reader and writer lock/unlock operations each, the resulting locking
>rates (avg of 3 runs) on a 4.10 kernel were 561.4 Mop/s and 588.8
>Mop/s without and with the patch respectively. That was an increase
>of about 5%.

iirc this patch is a repost, no? If so, did you get a chance to measure
single file access with direct io as dchinner suggested?

Thanks,
Davidlohr