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glibc/Rules
Adhemerval Zanella 5f6d8d97c6 malloc: Add madvise support for Transparent Huge Pages 
Linux Transparent Huge Pages (THP) current supports three different
states: 'never', 'madvise', and 'always'.  The 'never' is
self-explanatory and 'always' will enable THP for all anonymous
pages.  However, 'madvise' is still the default for some system and
for such case THP will be only used if the memory range is explicity
advertise by the program through a madvise(MADV_HUGEPAGE) call.

To enable it a new tunable is provided, 'glibc.malloc.hugetlb',
where setting to a value diffent than 0 enables the madvise call.

This patch issues the madvise(MADV_HUGEPAGE) call after a successful
mmap() call at sysmalloc() with sizes larger than the default huge
page size.  The madvise() call is disable is system does not support
THP or if it has the mode set to "never" and on Linux only support
one page size for THP, even if the architecture supports multiple
sizes.

To test is a new rule is added tests-malloc-hugetlb1, which run the
addes tests with the required GLIBC_TUNABLE setting.

Checked on x86_64-linux-gnu.

Reviewed-by: DJ Delorie <dj@redhat.com>
2021-12-15 17:35:14 -03:00

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# Copyright (C) 1991-2021 Free Software Foundation, Inc.
# This file is part of the GNU C Library.
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#
# Rules for making a subdirectory in the GNU C library.
# Each subdirectory Makefile defines some variables and includes this.
#
ifneq (,)
This makefile requires GNU Make.
endif
all: # Don't let the default goal come from Makeconfig.
include $(firstword $(..) ../)Makeconfig
ifndef subdir
Each subdirectory makefile must define the `subdir' variable.
endif
# This ` unconfuses emacs.
# This is benign and useless in GNU make before 3.63.
export subdir := $(subdir)
# This is the default target; it makes the library and auxiliary programs.
.PHONY: all
all: objs lib others
ifeq ($(build-programs),yes)
others: $(addprefix $(objpfx),$(extra-objs) \
$(install-lib) \
$(install-bin) $(install-bin-script) \
$(install-rootsbin) $(install-sbin))
else
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ifneq "$(findstring env,$(origin headers))" ""
headers :=
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ifneq "$(findstring env,$(origin generated))" ""
generated :=
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ifneq "$(findstring env,$(origin common-generated))" ""
common-generated :=
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# See below. This must be set before Makerules processes it.
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include $(..)Makerules
.PHONY: subdir_lib
subdir_lib: lib-noranlib
# Some subdirs need to install a dummy library.
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$(AR) cr$(verbose) $@ $<
endef
$(common-objpfx)dummy.c:
rm -f $@
(echo 'extern void __dummy__ (void);'; \
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# Test that all of the headers installed by this directory can be compiled
# in isolation.
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$(objpfx)check-installed-headers-c.out: \
$(..)scripts/check-installed-headers.sh $(headers)
$(SHELL) $(..)scripts/check-installed-headers.sh c \
"$(CC) $(filter-out -std=%,$(CFLAGS)) -D_ISOMAC $(+includes)" \
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# If a C++ compiler is available, also test that they can be compiled
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tests-special += $(objpfx)check-installed-headers-cxx.out
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$(..)scripts/check-installed-headers.sh $(headers)
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$(PYTHON) $< --root=$(..) --subdir=$(subdir) $(headers) > $@; \
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# Test that none of the headers installed by this directory use certain
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# This script does not need $(py-env).
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$(..)scripts/check-obsolete-constructs.py $(headers)
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binaries-malloc-check-tests =
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$(addprefix $(csu-objpfx),start.o) $(+preinit) $(+postinit)
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endif
# All malloc-check tests will be run with MALLOC_CHECK_=3
define malloc-check-ENVS
$(1)-malloc-check-ENV = MALLOC_CHECK_=3 \
LD_PRELOAD=$(common-objpfx)/malloc/libc_malloc_debug.so
endef
$(foreach t,$(tests-malloc-check),$(eval $(call malloc-check-ENVS,$(t))))
# All malloc-hugetlb1 tests will be run with GLIBC_TUNABLES=glibc.malloc.hugetlb=1
define malloc-hugetlb1-ENVS
$(1)-malloc-hugetlb1-ENV += GLIBC_TUNABLES=glibc.malloc.hugetlb=1
endef
$(foreach t,$(tests-malloc-hugetlb1),$(eval $(call malloc-hugetlb1-ENVS,$(t))))
# mcheck tests need the debug DSO to support -lmcheck.
define mcheck-ENVS
$(1)-mcheck-ENV = LD_PRELOAD=$(common-objpfx)/malloc/libc_malloc_debug.so
endef
$(foreach t,$(tests-mcheck),$(eval $(call mcheck-ENVS,$(t))))
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$(if $($*-ENV-only),$(test-wrapper-env-only) $($*-ENV-only),\
$(test-wrapper-env) $(run-program-env) $($*-ENV)) \
$(host-test-program-cmd) $($*-ARGS)
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$(evaluate-test)
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# when it previously ran and produced a .out file (probably for a failure).
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$(sort $(filter $(common-objpfx)lib%,$(link-libc-static-tests))) \
$(addprefix $(csu-objpfx),start.o) $(+preinit) $(+postinit)
$(+link-printers-tests)
# Add the paths to the generated constants file and test_common_printers.py
# to PYTHONPATH so the test scripts can find them.
py-env := PYTHONPATH=$(py-const-dir):$(..)scripts:$${PYTHONPATH}
# Static pattern rule that matches the test-* targets to their .c and .py
# prerequisites. It'll run the corresponding test script for each test program
# we compiled and place its output in the corresponding .out file.
# The pretty printer files and test_common_printers.py must be present for all.
$(tests-printers-out): $(objpfx)%.out: $(objpfx)% %.py %.c $(pretty-printers) \
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endif
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subdir_clean subdir_mostlyclean subdir_testclean
subdir_mostlyclean: mostlyclean
subdir_clean: clean
subdir_distclean: distclean
subdir_realclean: realclean
subdir_testclean: do-tests-clean
realclean: distclean
distclean: clean
# We want to install everything except the library itself, but update all
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.PHONY: subdir_objs subdir_stubs
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subdir_stubs: stubs
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$(common-objpfx)dummy.o: $(common-objpfx)dummy.c $(before-compile);
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# Local Variables:
# mode: makefile
# End:
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