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

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Message-ID: <20171018062226.GB18857@kroah.com>
Date:   Wed, 18 Oct 2017 08:22:26 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Ben Maurer <bmaurer@...com>
Cc:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Andi Kleen <andi@...stfloor.org>, carlos <carlos@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.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>,
        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

On Tue, Oct 17, 2017 at 04:19:41PM +0000, Ben Maurer wrote:
> Hey,
> 
> > So far the restrictions I see for libraries using this symbol are:
> > - They should never be unloaded,
> > - They should never be loaded with dlopen RTLD_LOCAL flag.
> 
> We talked a bit about this off-list but I wanted to state publicly
> that I think this model works well for our use case. Specifically,
> 
> (1) It reduces complexity by focusing on the common case -- long term
> we expect glibc to manage the process of using this feature and
> registering/deregistering threads for rseq. Unloading isn't a
> challenge in these situations, so why add the complexity for it?

You never install a new version of glibc on a running system, and expect
everything to keep running successfully?  Breaking that would not be
good...

thanks,

greg k-h