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authorSiddhesh Poyarekar <siddhesh@sourceware.org>2016-12-31 23:32:17 +0530
committerSiddhesh Poyarekar <siddhesh@sourceware.org>2016-12-31 23:49:24 +0530
commit67e58f39412ecd4467034761f3f074283c90f3c8 (patch)
tree1498c4ac17e0606ba3f38ac59296793fb0cc1dd5 /configure
parentbbe989ee87ee81f45a4f6450bff468f7a193e79e (diff)
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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 'configure')
-rwxr-xr-xconfigure16
1 files changed, 16 insertions, 0 deletions
diff --git a/configure b/configure
index c88f6fe88c..d80d738fd1 100755
--- a/configure
+++ b/configure
@@ -666,6 +666,7 @@ libc_cv_ssp
base_machine
add_on_subdirs
add_ons
+have_tunables
build_pt_chown
build_nscd
link_obsolete_rpc
@@ -782,6 +783,7 @@ enable_systemtap
enable_build_nscd
enable_nscd
enable_pt_chown
+enable_tunables
enable_mathvec
with_cpu
'
@@ -1452,6 +1454,7 @@ Optional Features:
--disable-build-nscd disable building and installing the nscd daemon
--disable-nscd library functions will not contact the nscd daemon
--enable-pt_chown Enable building and installing pt_chown
+ --enable-tunables Enable tunables support
--enable-mathvec Enable building and installing mathvec [default
depends on architecture]
@@ -3698,6 +3701,19 @@ if test "$build_pt_chown" = yes; then
fi
+# Check whether --enable-tunables was given.
+if test "${enable_tunables+set}" = set; then :
+ enableval=$enable_tunables; have_tunables=$enableval
+else
+ have_tunables=no
+fi
+
+
+if test "$have_tunables" = yes; then
+ $as_echo "#define HAVE_TUNABLES 1" >>confdefs.h
+
+fi
+
# The abi-tags file uses a fairly simplistic model for name recognition that
# can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a
# $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.