Date: Thu, 16 May 2013 23:49:11 -0500 From: Rob Landley <rob@...dley.net> To: musl@...ts.openwall.com Cc: musl@...ts.openwall.com Subject: Re: cpuset/affinity interfaces and TSX lock elision in musl On 05/16/2013 03:36:58 PM, Rich Felker wrote: > On Thu, May 16, 2013 at 06:37:01PM +0200, Daniel Cegiełka wrote: > > 1) Are there any plans to add support for cpuset/affinity > interfaces? > > I sat down to do it one day, and it was so ugly I got sick and put it > off again. Seriously. There's a huge abundance of CPU_* > macros/functions for manipulating abstract bitsets, but all "cpu set" > specific for no good reason. > > If anyone wants to volunteer to do these, it would be a big relief to > me. Some caveats: Meh, the data format's trivial. It's just that the documentation is in an insane place, namely here: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/arch/powerpc/include/asm/bitops.h (And no, it can't change because it would break existing binaries. Last I checked we still run binaries from 0.0.1 if you enable the ancient stuff. Alan Cox thacked people who broke that.) I ripped the glibc stuff out of my taskset implementation last year: http://landley.net/hg/toybox/rev/fb546cc2a022 And the new operations boil down to: int x = 255 & (mask[j/sizeof(long)] >> (8*(j&(sizeof(long)-1)))); mask[j/(2*sizeof(long))] |= digit << 4*(j&((2*sizeof(long))-1)); And yes, all the endianness and word size and such work out right if you just compile that for the target in question. Rob
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