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Re: [PATCH v2 1/3] PowerPC: Add the lock elision using HTM
- From: Andreas Schwab <schwab at suse dot de>
- To: Adhemerval Zanella <azanella at linux dot vnet dot ibm dot com>
- Cc: "GNU C. Library" <libc-alpha at sourceware dot org>
- Date: Thu, 12 Feb 2015 11:00:55 +0100
- Subject: Re: [PATCH v2 1/3] PowerPC: Add the lock elision using HTM
- Authentication-results: sourceware.org; auth=none
- References: <5491C98F dot 6030006 at linux dot vnet dot ibm dot com>
Adhemerval Zanella <email@example.com> writes:
> This patch adds support for lock elision using ISA 2.07 hardware
> transactional memory instructions for pthread_mutex primitives.
> Similar to s390 version, the for elision logic defined in
> 'force-elision.h' is only enabled if ENABLE_LOCK_ELISION is defined.
> Also, the lock elision code should be able to be built even with
> a compiler that does not provide HTM support with builtins.
> However I have noted the performance is sub-optimal due scheduling
> Tested on powerpc64 and powerpc32.
Did you test it on powerpc64le? perl is behaving very erroneously:
$ perl -e 'open(F, "echo foo |"); print while (<F>)' | wc -l
Something is causing fork to be reentered repeatedly, at random (the
number of processes varies between runs).
Andreas Schwab, SUSE Labs, firstname.lastname@example.org
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