[Bug 1414819] Comment bridged from LTC Bugzilla

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------- Comment From azanella at br.ibm.com 2015-02-12 12:33 EDT-------
It will require the upstream fix 6f7415033813c73fde81da60d209297901f35575 as well if you intend to built with a toolchain without HTM builtin support.

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https://bugs.launchpad.net/bugs/1414819

Title:
  Enable glibc to take advantage of HTM on Ubuntu 15.04

Status in glibc package in Ubuntu:
  New

Bug description:
  This Feature request is to track Ubuntu's glibc to take advatnage of
  Hardware Transactional memory on Ubuntu 15.04.

  Adhmerval is porting eglibc threads mechanism to use hardware
  transactional memory, and this is a feature we want to have on Ubuntu.

  Bugs:
  https://bugs.launchpad.net/tasty-taco/+bug/1328210 (HTM exploitation on GLIBC)

  Patches upstream:
  https://sourceware.org/ml/libc-alpha/2014-08/msg00409.html
  https://sourceware.org/ml/libc-alpha/2014-08/msg00410.html
  https://sourceware.org/ml/libc-alpha/2014-08/msg00411.html
  https://sourceware.org/ml/libc-alpha/2014-08/msg00412.html

  I updated the IBM 2.20 branch (used for AT8) with the lock elision
  patches [1], with the IDs:

  powerpc: Add the lock elision using HTM - 1d45200a803939be3316b7ddf442906d544e9d43
  powerpc: Add adaptive elision to rwlocks - 0f7cecb9cf4b370c3d72f67e048bb07e238cf110
  powerpc: abort transaction in syscalls - 1d19c9bc0dabb1d10c07cf4eec063f9da8406c2f

  It should apply cleanly on a 2.20 tree.  Also, to enable it you need
  to explicit configure the build with

  --enable-lock-elision=yes

  [1]
  https://sourceware.org/git/?p=glibc.git;a=shortlog;h=refs/heads/ibm/2.20/master

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