From: Andreas Jaeger <aj@suse.de>
To: Ulrich Drepper <drepper@redhat.com>
Cc: GNU libc hacker <libc-hacker@sources.redhat.com>
Subject: Re: cpuset_t interfaces
Date: Thu, 18 Mar 2004 06:06:00 -0000 [thread overview]
Message-ID: <m3u10mbsep.fsf@gromit.moeb> (raw)
In-Reply-To: <40593A5E.2090500@redhat.com> (Ulrich Drepper's message of "Wed, 17 Mar 2004 21:57:50 -0800")
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Ulrich Drepper <drepper@redhat.com> writes:
> I intend to change the interfaces taking a cpuset_t parameter.
> Currently we have
>
> extern int pthread_attr_setaffinity_np (pthread_attr_t *__attr,
> __const cpu_set_t *__cpuset);
> extern int pthread_attr_getaffinity_np (__const pthread_attr_t *__attr,
> cpu_set_t *__cpuset);
>
> and the sched_[sg]etaffinity interfaces which have no prototype yet.
>
> The problem is the limited cpuset_t size. Just thinking about HT
> multicore processors in multi-processor machines should be enough that
> 1024 virtual processors isn't that hard to reach.
>
>
> Therefore the interface should include a size parameter:
>
> extern int pthread_attr_setaffinity_np (pthread_attr_t *__attr,
> __const cpu_set_t *__cpuset,
> size_t size);
> extern int pthread_attr_getaffinity_np (__const pthread_attr_t *__attr,
> cpu_set_t *__cpuset,
> size_t size);
>
>
> This way the data structure can be expanded if necessary.
>
> The interfaces are in very little use today. We keep the old interfaces
> and make them simple wrappers with a fixed size of 128 bytes.
>
>
> Unless I hear well-founded objections I'll make the change tomorrow.
Go ahead and make the change. Since you leave the compatibilty
interface, it should be ok...
Andreas
--
Andreas Jaeger, aj@suse.de, http://www.suse.de/~aj
SuSE Linux AG, Maxfeldstr. 5, 90409 Nürnberg, Germany
GPG fingerprint = 93A3 365E CE47 B889 DF7F FED1 389A 563C C272 A126
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next prev parent reply other threads:[~2004-03-18 6:06 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-18 5:57 Ulrich Drepper
2004-03-18 6:06 ` Andreas Jaeger [this message]
2004-03-19 7:40 ` Andreas Jaeger
2004-03-19 19:00 ` Ulrich Drepper
2004-03-20 4:29 ` Andreas Jaeger
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