linux-kernel - Re: [RFC PATCH v9 for 4.15 01/14] Restartable sequences system call

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Message-ID: <20171016164600.GO2482@two.firstfloor.org>
Date:   Mon, 16 Oct 2017 09:46:01 -0700
From:   Andi Kleen <andi@...stfloor.org>
To:     Carlos O'Donell <carlos@...hat.com>
Cc:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Ben Maurer <bmaurer@...com>,
        David Goldblatt <davidgoldblatt@...com>,
        Qi Wang <qiwang@...com>, Boqun Feng <boqun.feng@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Paul Turner <pjt@...gle.com>, Andrew Hunter <ahh@...gle.com>,
        Andy Lutomirski <luto@...capital.net>,
        Dave Watson <davejwatson@...com>,
        Josh Triplett <josh@...htriplett.org>,
        Will Deacon <will.deacon@....com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andi Kleen <andi@...stfloor.org>, Chris Lameter <cl@...ux.com>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, rostedt <rostedt@...dmis.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Russell King <linux@....linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-api <linux-api@...r.kernel.org>
Subject: Re: [RFC PATCH v9 for 4.15 01/14] Restartable sequences system call

> How you collect, summarize, and analyze that overwhelming evidence
> is up to you, specific to each change, and difficult to do accurately
> and with any large measure of statistical confidence. The reviewer
> has to basically trust you to some degree :-)

I think Linus' just asked for some working "real world, not micro" code that
demonstrates use.

A prototype type implementation of the glibc malloc cache using this may
be good enough.

Even if the API still changes slightly later in review I would assume
the basic concepts will stay the same, so it would be likely not
too difficult to convert that prototype to the later final API.

-Andi