Date: Fri, 17 May 2013 13:28:02 +0200 From: Szabolcs Nagy <nsz@...t70.net> To: musl@...ts.openwall.com Subject: Re: cpuset/affinity interfaces and TSX lock elision in musl * Daniel Cegie?ka <daniel.cegielka@...il.com> [2013-05-17 09:41:18 +0200]: > >> 2) The upcoming glibc will have support for TSX lock elision. > >> > >> http://en.wikipedia.org/wiki/Transactional_Synchronization_Extensions > >> > >> http://lwn.net/Articles/534761/ > >> > >> Are there any outlook that we can support TSX lock elision in musl? > > > > I was involved in the discussions about lock elision on the glibc > > mailing list, and from what I could gather, it's a pain to implement > > and whether it brings you any benefit is questionable. > > There is currently no hardware support, so the tests were done in the > emulator. It's too early to say there's is no performance gain. > it's not the lock performance that's questionable but the benefits locks should not be the bottleneck in applications unless there is too much shared state on hot paths, which is probably a design bug or a special use-case for which non-standard synchronization methods may be better anyway for the implementation costs check the glibc discussion where rich pointed out conformance issues in the original design http://article.gmane.org/gmane.comp.lib.glibc.alpha/29240
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