linux-kernel - Re: [PATCH glibc 1/3] glibc: Perform rseq registration at C startup and thread creation (v20)

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Message-ID: <906553413.6099.1592485387108.JavaMail.zimbra@efficios.com>
Date:   Thu, 18 Jun 2020 09:03:07 -0400 (EDT)
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     Szabolcs Nagy <szabolcs.nagy@....com>
Cc:     Joseph Myers <joseph@...esourcery.com>,
        Florian Weimer <fweimer@...hat.com>,
        Rich Felker <dalias@...c.org>,
        libc-alpha <libc-alpha@...rceware.org>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-api <linux-api@...r.kernel.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Will Deacon <will.deacon@....com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Ben Maurer <bmaurer@...com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Dave Watson <davejwatson@...com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Paul <paulmck@...ux.vnet.ibm.com>, Paul Turner <pjt@...gle.com>
Subject: Re: [PATCH glibc 1/3] glibc: Perform rseq registration at C startup
 and thread creation (v20)

----- On Jun 18, 2020, at 8:22 AM, Szabolcs Nagy szabolcs.nagy@....com wrote:

> The 06/11/2020 20:26, Joseph Myers wrote:
>> On Thu, 11 Jun 2020, Mathieu Desnoyers wrote:
>> > I managed to get a repository up and running for librseq, and have integrated
>> > the rseq.2 man page with comments from Michael Kerrisk here:
>> > 
>> > https://git.kernel.org/pub/scm/libs/librseq/librseq.git/tree/doc/man/rseq.2
>> > 
>> > Is that a suitable URL ? Can we simply point to it from glibc's manual ?
>> 
>> Yes, that seems something reasonable to link to.
> 
> is there work to make the usage of rseq critical
> sections portable? (e.g. transactional memory
> critical section has syntax in gcc, but that
> doesn't require straight line code with
> begin/end/abort labels in a particular layout.)
> 
> the macros and inline asm in rseq-*.h are not
> too nice, but if they can completely hide the
> non-portable bits then i guess that works.

My goal with librseq is indeed to provide static inlines
which hide the architecture-specific ugliness of rseq
critical section assembly code behind an API which can be
used from all supported architectures for most of the
known use-cases, so only very specific use-case would
have to craft their own assembly.

Thanks,

Mathieu

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