[commit: ghc] master: Eliminate zero_static_objects_list() (b949c96)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/b949c96b4960168a3b399fe14485b24a2167b982/ghc

>---------------------------------------------------------------

commit b949c96b4960168a3b399fe14485b24a2167b982
Author: Simon Marlow <marlowsd at gmail.com>
Date:   Thu Jul 16 15:01:49 2015 +0100

    Eliminate zero_static_objects_list()
    
    Summary:
    In a workload with a large amount of code, zero_static_objects_list()
    takes a significant amount of time, and furthermore it is in the
    single-threaded part of the GC.
    
    This patch uses a slightly fiddly scheme for marking objects on the
    static object lists, using a flag in the low 2 bits that flips between
    two states to indicate whether an object has been visited during this
    GC or not.  We also have to take into account objects that have not
    been visited yet, which might appear at any time due to runtime linking.
    
    Test Plan: validate
    
    Reviewers: austin, bgamari, ezyang, rwbarton
    
    Subscribers: thomie
    
    Differential Revision: https://phabricator.haskell.org/D1076


>---------------------------------------------------------------

b949c96b4960168a3b399fe14485b24a2167b982
 compiler/codeGen/StgCmmHeap.hs |  5 ++-
 rts/CheckUnload.c              |  6 ++-
 rts/RetainerProfile.c          |  2 +-
 rts/sm/Compact.c               |  4 +-
 rts/sm/Evac.c                  | 95 ++++++++++++++++--------------------------
 rts/sm/GC.c                    | 48 ++++++---------------
 rts/sm/GCAux.c                 | 10 +++--
 rts/sm/GCThread.h              |  7 +++-
 rts/sm/Sanity.c                |  3 +-
 rts/sm/Scav.c                  | 11 ++---
 rts/sm/Storage.c               | 10 ++---
 rts/sm/Storage.h               | 57 +++++++++++++++++++++++--
 12 files changed, 137 insertions(+), 121 deletions(-)

Diff suppressed because of size. To see it, use:

    git diff-tree --root --patch-with-stat --no-color --find-copies-harder --ignore-space-at-eol --cc b949c96b4960168a3b399fe14485b24a2167b982