From: "H.J. Lu" <hjl.tools@gmail.com>
To: Florian Weimer <fweimer@redhat.com>
Cc: "Carlos O'Donell" <carlos@redhat.com>,
GNU C Library <libc-alpha@sourceware.org>
Subject: Re: [PATCH] Add getcpu
Date: Wed, 5 Dec 2018 12:07:05 -0800 [thread overview]
Message-ID: <CAMe9rOo7i_-keOooa0D+P_wzatVCdKkTRiFiJ-cxpnvi+eApuQ@mail.gmail.com> (raw)
In-Reply-To: <87va47eoge.fsf@oldenburg2.str.redhat.com>
On Wed, Dec 5, 2018 at 11:57 AM Florian Weimer <fweimer@redhat.com> wrote:
>
> * H. J. Lu:
>
> > I updated the patch with a very simple test.
>
> The simple test has a race condition unfortunately.
>
> I think we could fold the test into the existing affinity tests.
Sure, I will do that.
> The main question is whether getcpu is fast enough. It does not perform
> a system call, but in my tests a while back, it was still rather slow.
It is fast enough for NUMA spinlock.
> The new rseq-based getcpu does not support NUMA nodes, it seems. Maybe
> it's still possible to fix that.
That will be great. We can take advantage it when it is available.
--
H.J.
next prev parent reply other threads:[~2018-12-05 20:07 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-05 14:29 RFC: Add getcpu wrapper H.J. Lu
2018-12-05 15:35 ` Florian Weimer
2018-12-05 15:40 ` H.J. Lu
2018-12-05 15:48 ` Florian Weimer
2018-12-05 16:00 ` Zack Weinberg
2018-12-05 16:04 ` H.J. Lu
2018-12-05 17:33 ` Carlos O'Donell
2018-12-05 17:41 ` [PATCH] Add getcpu H.J. Lu
2018-12-05 18:13 ` H.J. Lu
2018-12-05 18:48 ` Florian Weimer
2018-12-05 19:50 ` H.J. Lu
2018-12-05 19:57 ` Florian Weimer
2018-12-05 20:07 ` H.J. Lu [this message]
2018-12-05 20:14 ` H.J. Lu
2018-12-07 12:50 ` Tulio Magno Quites Machado Filho
2018-12-07 14:49 ` H.J. Lu
2018-12-05 20:43 ` Joseph Myers
2018-12-05 20:56 ` The future of the manual (was Re: [PATCH] Add getcpu) Zack Weinberg
2018-12-05 21:28 ` Joseph Myers
2018-12-07 13:11 ` Florian Weimer
2018-12-05 21:39 ` [PATCH] Add getcpu H.J. Lu
2018-12-05 21:45 ` Joseph Myers
2018-12-05 21:55 ` Florian Weimer
2018-12-06 20:26 ` H.J. Lu
2018-12-07 16:51 ` Florian Weimer
2018-12-07 17:01 ` H.J. Lu
2018-12-07 17:15 ` Florian Weimer
2018-12-07 20:29 ` [PATCH] Don't use __typeof__ (getcpu) H.J. Lu
2018-12-07 20:38 ` Samuel Thibault
2018-12-07 20:49 ` H.J. Lu
2018-12-10 12:20 ` [PATCH] Add getcpu Szabolcs Nagy
2018-12-10 12:22 ` Florian Weimer
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