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| author | Siddhesh Poyarekar <siddhesh@sourceware.org> | 2016-12-31 23:32:17 +0530 |
|---|---|---|
| committer | Siddhesh Poyarekar <siddhesh@sourceware.org> | 2016-12-31 23:49:24 +0530 |
| commit | 67e58f39412ecd4467034761f3f074283c90f3c8 (patch) | |
| tree | 1498c4ac17e0606ba3f38ac59296793fb0cc1dd5 /INSTALL | |
| parent | bbe989ee87ee81f45a4f6450bff468f7a193e79e (diff) | |
| download | glibc-67e58f39412ecd4467034761f3f074283c90f3c8.zip glibc-67e58f39412ecd4467034761f3f074283c90f3c8.tar.gz glibc-67e58f39412ecd4467034761f3f074283c90f3c8.tar.bz2 | |
Add framework for tunables
The tunables framework allows us to uniformly manage and expose global
variables inside glibc as switches to users. tunables/README has
instructions for glibc developers to add new tunables.
Tunables support can be enabled by passing the --enable-tunables
configure flag to the configure script. This patch only adds a
framework and does not pose any limitations on how tunable values are
read from the user. It also adds environment variables used in malloc
behaviour tweaking to the tunables framework as a PoC of the
compatibility interface.
* manual/install.texi: Add --enable-tunables option.
* INSTALL: Regenerate.
* README.tunables: New file.
* Makeconfig (CPPFLAGS): Define TOP_NAMESPACE.
(before-compile): Generate dl-tunable-list.h early.
* config.h.in: Add HAVE_TUNABLES.
* config.make.in: Add have-tunables.
* configure.ac: Add --enable-tunables option.
* configure: Regenerate.
* csu/init-first.c (__libc_init_first): Move
__libc_init_secure earlier...
* csu/init-first.c (LIBC_START_MAIN):... to here.
Include dl-tunables.h, libc-internal.h.
(LIBC_START_MAIN) [!SHARED]: Initialize tunables for static
binaries.
* elf/Makefile (dl-routines): Add dl-tunables.
* elf/Versions (ld): Add __tunable_set_val to GLIBC_PRIVATE
namespace.
* elf/dl-support (_dl_nondynamic_init): Unset MALLOC_CHECK_
only when !HAVE_TUNABLES.
* elf/rtld.c (process_envvars): Likewise.
* elf/dl-sysdep.c [HAVE_TUNABLES]: Include dl-tunables.h
(_dl_sysdep_start): Call __tunables_init.
* elf/dl-tunable-types.h: New file.
* elf/dl-tunables.c: New file.
* elf/dl-tunables.h: New file.
* elf/dl-tunables.list: New file.
* malloc/tst-malloc-usable-static.c: New test case.
* malloc/Makefile (tests-static): Add it.
* malloc/arena.c [HAVE_TUNABLES]: Include dl-tunables.h.
Define TUNABLE_NAMESPACE.
(DL_TUNABLE_CALLBACK (set_mallopt_check)): New function.
(DL_TUNABLE_CALLBACK_FNDECL): New macro. Use it to define
callback functions.
(ptmalloc_init): Set tunable values.
* scripts/gen-tunables.awk: New file.
* sysdeps/mach/hurd/dl-sysdep.c: Include dl-tunables.h.
(_dl_sysdep_start): Call __tunables_init.
Diffstat (limited to 'INSTALL')
| -rw-r--r-- | INSTALL | 5 |
1 files changed, 5 insertions, 0 deletions
@@ -169,6 +169,11 @@ will be used, and CFLAGS sets optimization options for the compiler. By default for x86_64, the GNU C Library is built with the vector math library. Use this option to disable the vector math library. +'--enable-tunables' + Tunables support allows additional library parameters to be + customized at runtime. This is an experimental feature and affects + startup time and is thus disabled by default. + '--build=BUILD-SYSTEM' '--host=HOST-SYSTEM' These options are for cross-compiling. If you specify both options |