[Bug 1414819] Re: Enable glibc to take advantage of HTM on Ubuntu 15.04

[Steve Langasek]

In speaking with Adam, I understand our target glibc version for 15.04
is 2.21, not 2.20.  As 2.21 has not yet been released and validated
across Ubuntu's architectures, there's some risk that 2.21 will not be
included in 15.04.  However, if it's not included for 15.04 we would be
shipping 2.19, not 2.20.

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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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