linux-kernel - Re: [RFC PATCH v8 1/9] Restartable sequences system call

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Message-ID: <20160829161023.snsjfsudoxzwosvj@x>
Date:   Mon, 29 Aug 2016 09:10:24 -0700
From:   Josh Triplett <josh@...htriplett.org>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     Ben Maurer <bmaurer@...com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Dave Watson <davejwatson@...com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Andy Lutomirski <luto@...capital.net>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-api <linux-api@...r.kernel.org>,
        Paul Turner <pjt@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Russell King <linux@....linux.org.uk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Andrew Hunter <ahh@...gle.com>,
        Andi Kleen <andi@...stfloor.org>, Chris Lameter <cl@...ux.com>,
        rostedt <rostedt@...dmis.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [RFC PATCH v8 1/9] Restartable sequences system call

On Mon, Aug 29, 2016 at 03:16:52PM +0000, Mathieu Desnoyers wrote:
> ----- On Aug 27, 2016, at 12:22 AM, Josh Triplett josh@...htriplett.org wrote:
> > Ben, Mathieu, Dave, do you have jemalloc benchmark numbers with and
> > without rseq?  (As well as memory usage numbers for the reduced memory
> > usage of per-CPU pools rather than per-thread pools?)
> 
> Before I started reimplementing rseq, the numbers presented by Facebook
> at https://lkml.org/lkml/2015/10/22/588 were in my opinion a good proof
> that rseq is useful. I'm not sure if their memoryidler API was used back
> then.
> 
> I could take Dave's jemalloc branch adapted to Paul Turner's rseq and
> adapt it to mine. Then we could use this allocator to compare the
> memory use and speed of heavily multi-threaded applications.
> 
> Thoughts ?

That seems like it would provide a good concrete benchmark of this work,
and demonstrate the value of it.