From: "Tulio Magno Quites Machado Filho" <tuliom@linux.vnet.ibm.com>
To: "Carlos O'Donell" <carlos@redhat.com>,
GNU C Library <libc-alpha@sourceware.org>
Subject: Re: RFC: Always-on elision with per-process opt-in using tunables.
Date: Mon, 15 May 2017 19:59:00 -0000 [thread overview]
Message-ID: <87pof9yjqm.fsf@totoro.br.ibm.com> (raw)
In-Reply-To: <de358ecb-120d-a579-5998-cdbee930ba01@redhat.com>
Carlos O'Donell <carlos@redhat.com> writes:
> I am going to propose the following:
>
> * Always build with elision support.
>
> * Elision disabled by default at runtime.
>
> * Use tunables to allow processes to opt-in to transparent elision.
>
> The benefit is that the elision support doesn't bit-rot, and we keep
> it working, and that distributions can conservatively backport elision
> and allow users to test enablement on a per-process basis.
>
> The elision is enabled with:
>
> GLIBC_TUNABLE=glibc.elision.enable=1
I like this proposal.
> The obvious set of patches are:
>
> (a) Split out some cleanups in this patch.
> (b) Always build with elision and us tunables to opt-in.
> (c) Extend tunables to allow modification of elision parameters
> (useful for upcoming rwlock elision re-enablement).
Paul Murphy had a patch to implement this step.
It could be useful, although it's outdated:
https://patchwork.sourceware.org/patch/10342/
Another patch to the set you suggested:
(d) Extend the testsuite to test elided locks too.
--
Tulio Magno
next prev parent reply other threads:[~2017-05-15 19:59 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-11 15:45 Carlos O'Donell
2017-05-12 11:14 ` Stefan Liebler
2017-06-21 7:02 ` Stefan Liebler
2017-05-15 19:59 ` Tulio Magno Quites Machado Filho [this message]
2017-05-30 6:46 ` Torvald Riegel
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