Date: Sun, 29 Jan 2023 15:42:55 +0300 From: Dmitry Chagin <dchagin@heemeyer.club> To: Dmitry Chagin <dchagin@freebsd.org> Cc: src-committers@freebsd.org, dev-commits-src-all@freebsd.org, dev-commits-src-main@freebsd.org Subject: Re: git: 01f74ccd5a0d - main - libthr: Fix pthread_attr_[g|s]etaffinity_np to match it's manual and the kernel. Message-ID: <Y9Zpz0M1EVf2C6Zf@heemeyer.club> In-Reply-To: <202301291238.30TCcKFb050951@gitrepo.freebsd.org> References: <202301291238.30TCcKFb050951@gitrepo.freebsd.org>
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On Sun, Jan 29, 2023 at 12:38:20PM +0000, Dmitry Chagin wrote: > The branch main has been updated by dchagin: > > URL: https://cgit.FreeBSD.org/src/commit/?id=01f74ccd5a0d1a444703e931339709c7de5296b5 > > commit 01f74ccd5a0d1a444703e931339709c7de5296b5 > Author: Dmitry Chagin <dchagin@FreeBSD.org> > AuthorDate: 2023-01-29 12:35:18 +0000 > Commit: Dmitry Chagin <dchagin@FreeBSD.org> > CommitDate: 2023-01-29 12:35:18 +0000 > > libthr: Fix pthread_attr_[g|s]etaffinity_np to match it's manual and the kernel. > > Since f35093f8 semantics of a thread affinity functions is changed to be a > compatible with Linux: > > In case of getaffinity(), the minimum cpuset_t size that the kernel permits is > the maximum CPU id, present in the system, / NBBY bytes, the maximum size is not > limited. > In case of setaffinity(), the kernel does not limit the size of the user-provided > cpuset_t, internally using only the meaningful part of the set, where the upper > bound is the maximum CPU id, present in the system, no larger than the size of > the kernel cpuset_t. > > To match pthread_attr_[g|s]etaffinity_np checks of the user-provided cpusets to > the kernel behavior export the minimum cpuset_t size allowed by running kernel > via new sysctl kern.sched.cpusetsizemin and use it in checks. > > Reviewed by: whoops, kib@
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