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

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Message-ID: <CA+55aFxZo_K41mvgWzbHSnUSZd3SbH3F_PqWF9ZqK4shdqynVg@mail.gmail.com>
Date:   Fri, 13 Oct 2017 21:05:11 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     Ben Maurer <bmaurer@...com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        David Goldblatt <davidgoldblatt@...com>,
        Qi Wang <qiwang@...com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.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 Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Chris Lameter <cl@...ux.com>, Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Steven 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

On Fri, Oct 13, 2017 at 8:01 PM, Andi Kleen <andi@...stfloor.org> wrote:
>
> As far as I can see the current model fundamentally only works for
> one user per process (because there is only a single range and abort IP)

No, it should work for libraries, you just need to always initialize
the proper start/commit/abort IP's for every transaction. Then
everybody should be fine.

So I _think_ it's all good. But I really would want to see that
actually being the case.

                Linus