There was a number of problems I ran into when trying the
profile-directed optimizations added by Andi Kleen in git commit
7ddc2710b9. (This was using gcc 4.4 found on many enterprise
distros.)
1) The -fprofile-generate and -fprofile-use commands are incompatible
with ccache; the code ends up looking in the wrong place for the gcda
files based on the ccache object names.
2) If the makefile notices that CFLAGS are different, it will rebuild
all of the binaries. Hence the recipe originally specified by the
INSTALL file ("make profile-all" followed by "make install") doesn't
work. It will appear to work, but the binaries will end up getting
built with no optimization.
This patch fixes this by using an explicit set of options passed via
PROFILE_GEN and PROFILE_USE and then using these to directly
manipulate CFLAGS and EXTLIBS.
Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
---
INSTALL | 4 ++--
Makefile | 31 +++++++++++++++++++++++--------
2 files changed, 25 insertions(+), 10 deletions(-)
diff --git a/INSTALL b/INSTALL
index 6fa83fe..978ed09 100644
--- a/INSTALL
+++ b/INSTALL
@@ -28,8 +28,8 @@ set up install paths (via config.mak.autogen), so you can write instead
If you're willing to trade off (much) longer build time for a later
faster git you can also do a profile feedback build with
- $ make profile-all
- # make prefix=... install
+ $ make prefix=... profile-all
+ # make prefix=... PROFILE_USE=t install
This will run the complete test suite as training workload and then
rebuild git with the generated profile feedback. This results in a git
diff --git a/Makefile b/Makefile
index c457c34..15d1df4 100644
--- a/Makefile
+++ b/Makefile
@@ -1772,6 +1772,24 @@ ifdef ASCIIDOC7
export ASCIIDOC7
endif
+### profile feedback build
+#
+
+# Can adjust this to be a global directory if you want to do extended
+# data gathering
+PROFILE_DIR := $(CURDIR)
+
+ifdef PROFILE_GEN
+ CFLAGS += -fprofile-generate=$(PROFILE_DIR) -DNO_NORETURN=1
+ EXTLIBS += -lgcov
+ export CCACHE_DISABLE=t
+endif
+
+ifdef PROFILE_USE
+ CFLAGS += -fprofile-use=$(PROFILE_DIR) -fprofile-correction -DNO_NORETURN=1
+ export CCACHE_DISABLE=t
+endif
+
# Shell quote (do not use $(call) to accommodate ancient setups);
SHA1_HEADER_SQ = $(subst ','\'',$(SHA1_HEADER))
@@ -2701,14 +2719,11 @@ cover_db_html: cover_db
#
.PHONY: profile-all profile-clean
-PROFILE_GEN_CFLAGS := $(CFLAGS) -fprofile-generate -DNO_NORETURN=1
-PROFILE_USE_CFLAGS := $(CFLAGS) -fprofile-use -fprofile-correction -DNO_NORETURN=1
-
profile-clean:
- $(RM) $(addsuffix *.gcda,$(object_dirs))
- $(RM) $(addsuffix *.gcno,$(object_dirs))
+ $(RM) $(addsuffix *.gcda,$(addprefix $(PROFILE_DIR)/, $(object_dirs)))
+ $(RM) $(addsuffix *.gcno,$(addprefix $(PROFILE_DIR)/, $(object_dirs)))
profile-all: profile-clean
- $(MAKE) CFLAGS="$(PROFILE_GEN_CFLAGS)" all
- $(MAKE) CFLAGS="$(PROFILE_GEN_CFLAGS)" -j1 test
- $(MAKE) CFLAGS="$(PROFILE_USE_CFLAGS)" all
+ $(MAKE) PROFILE_GEN=t all
+ $(MAKE) PROFILE_GEN=t -j1 test
+ $(MAKE) PROFILE_USE=t all
--
1.7.8.11.gefc1f.dirty
--
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