diff options
| author | Rogerio Alves <rcardoso@linux.vnet.ibm.com> | 2017-12-05 14:24:14 -0200 |
|---|---|---|
| committer | Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com> | 2017-12-05 17:48:48 -0200 |
| commit | 07ed18d26a342741cb25a4739158c65ed9dd4d09 (patch) | |
| tree | fb40f10305dcd58b492bf0b685b29b37266bc8c8 /configure.ac | |
| parent | a5a2a76bb71940cb8ceb4769a975327027fd55b5 (diff) | |
| download | glibc-07ed18d26a342741cb25a4739158c65ed9dd4d09.zip glibc-07ed18d26a342741cb25a4739158c65ed9dd4d09.tar.gz glibc-07ed18d26a342741cb25a4739158c65ed9dd4d09.tar.bz2 | |
Add elision tunables
This patch adds several new tunables to control the behavior of
elision on supported platforms[1]. Since elision now depends
on tunables, we should always *compile* with elision enabled,
and leave the code disabled, but available for runtime
selection. This gives us *much* better compile-time testing of
the existing code to avoid bit-rot[2].
Tested on ppc, ppc64, ppc64le, s390x and x86_64.
[1] This part of the patch was initially proposed by
Paul Murphy but was "staled" because the framework have changed
since the patch was originally proposed:
https://patchwork.sourceware.org/patch/10342/
[2] This part of the patch was inititally proposed as a RFC by
Carlos O'Donnell. Make sense to me integrate this on the patch:
https://sourceware.org/ml/libc-alpha/2017-05/msg00335.html
* elf/dl-tunables.list: Add elision parameters.
* manual/tunables.texi: Add entries about elision tunable.
* sysdeps/unix/sysv/linux/powerpc/elision-conf.c:
Add callback functions to dynamically enable/disable elision.
Add multiple callbacks functions to set elision parameters.
Deleted __libc_enable_secure check.
* sysdeps/unix/sysv/linux/s390/elision-conf.c: Likewise.
* sysdeps/unix/sysv/linux/x86/elision-conf.c: Likewise.
* configure: Regenerated.
* configure.ac: Option enable_lock_elision was deleted.
* config.h.in: ENABLE_LOCK_ELISION flag was deleted.
* config.make.in: Remove references to enable_lock_elision.
* manual/install.texi: Elision configure option was removed.
* INSTALL: Regenerated to remove enable_lock_elision.
* nptl/Makefile:
Disable elision so it can verify error case for destroying a mutex.
* sysdeps/powerpc/nptl/elide.h:
Cleanup ENABLE_LOCK_ELISION check.
Deleted macros for the case when ENABLE_LOCK_ELISION was not defined.
* sysdeps/s390/configure: Regenerated.
* sysdeps/s390/configure.ac: Remove references to enable_lock_elision..
* nptl/tst-mutex8.c:
Deleted all #ifndef ENABLE_LOCK_ELISION from the test.
* sysdeps/powerpc/powerpc32/sysdep.h:
Deleted all ENABLE_LOCK_ELISION checks.
* sysdeps/powerpc/powerpc64/sysdep.h: Likewise.
* sysdeps/powerpc/sysdep.h: Likewise.
* sysdeps/s390/nptl/bits/pthreadtypes-arch.h: Likewise.
* sysdeps/unix/sysv/linux/powerpc/force-elision.h: Likewise.
* sysdeps/unix/sysv/linux/s390/elision-conf.h: Likewise.
* sysdeps/unix/sysv/linux/s390/force-elision.h: Likewise.
* sysdeps/unix/sysv/linux/s390/lowlevellock.h: Likewise.
* sysdeps/unix/sysv/linux/s390/Makefile: Remove references to
enable-lock-elision.
Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 10 |
1 files changed, 0 insertions, 10 deletions
diff --git a/configure.ac b/configure.ac index 9707ae4..f85a50d 100644 --- a/configure.ac +++ b/configure.ac @@ -199,16 +199,6 @@ if test "$enable_stackguard_randomize" = yes; then AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE) fi -AC_ARG_ENABLE([lock-elision], - AC_HELP_STRING([--enable-lock-elision[=yes/no]], - [Enable lock elision for pthread mutexes by default]), - [enable_lock_elision=$enableval], - [enable_lock_elision=no]) -AC_SUBST(enable_lock_elision) -if test "$enable_lock_elision" = yes ; then - AC_DEFINE(ENABLE_LOCK_ELISION) -fi - AC_ARG_ENABLE([hidden-plt], AC_HELP_STRING([--disable-hidden-plt], [do not hide internal function calls to avoid PLT]), |