linux-kernel - Re: Restartable Sequences system call merged into Linux

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Message-ID: <1069078546.14418.1529084651587.JavaMail.zimbra@efficios.com>
Date:   Fri, 15 Jun 2018 13:44:11 -0400 (EDT)
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     Florian Weimer <fweimer@...hat.com>
Cc:     Pavel Machek <pavel@....cz>, carlos <carlos@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        libc-alpha <libc-alpha@...rceware.org>
Subject: Re: Restartable Sequences system call merged into Linux

----- On Jun 15, 2018, at 1:10 AM, Florian Weimer fweimer@...hat.com wrote:

> On 06/14/2018 03:46 PM, Mathieu Desnoyers wrote:
>> This would allow registering various TLS data structures with a single
>> system call without hindering flexibility on the user-space side. For
>> instance, we could still use initial-exec and the __rseq_abi symbol for
>> rseq with this approach.
>> 
>> Thoughts ?
> 
> Isn't this just a very narrow case of the usual batched syscalls
> proposal? 8-)

Pretty much. But let's not go there unless this is really needed.
It looks like the added syscall on thread creation is not an issue
so far.

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com