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Date: Mon, 15 Mar 2021 18:32:29 +0100
From: Jiri Olsa <jolsa@...hat.com>
To: Denys Zagorui <dzagorui@...co.com>
Cc: peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
mark.rutland@....com, alexander.shishkin@...ux.intel.com,
namhyung@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] perf: build reproducibility improvements
On Mon, Mar 15, 2021 at 09:46:35AM -0700, Denys Zagorui wrote:
> This patch helps to make perf build more reproducible
>
> It seems there is some need to have an ability to invoke
> perf from build directory without installation
> (84cfac7f05e1: perf tools: Set and pass DOCDIR to builtin-report.c)
> DOCDIR contains an absolute path to kernel source directory.
> In such case this path can be determined in runtime by using
> /proc/self/exe link. In case of building perf with O=
> Documentation/tips.txt can be copied to output directory.
>
> There is also python binding test where PYTHONPATH is used to store
> absolute path to python/perf.so library. This path can be
> also determined in runtime.
>
> bison stores full paths in generated files. This can be
> remapped by using --file-prefix-map option that is available
> starting from version 3.7.1.
>
> Signed-off-by: Denys Zagorui <dzagorui@...co.com>
> ---
> tools/lib/subcmd/exec-cmd.c | 21 +++++++++++++++++++++
> tools/lib/subcmd/exec-cmd.h | 1 +
> tools/perf/Build | 1 -
> tools/perf/Makefile.perf | 3 +++
> tools/perf/builtin-report.c | 21 ++++++++++++++++++---
> tools/perf/tests/Build | 2 +-
> tools/perf/tests/python-use.c | 14 +++++++++++++-
> tools/perf/util/Build | 10 +++++++---
> 8 files changed, 64 insertions(+), 9 deletions(-)
>
> diff --git a/tools/lib/subcmd/exec-cmd.c b/tools/lib/subcmd/exec-cmd.c
> index 33e94fb83986..3116246ec629 100644
> --- a/tools/lib/subcmd/exec-cmd.c
> +++ b/tools/lib/subcmd/exec-cmd.c
> @@ -208,3 +208,24 @@ int execl_cmd(const char *cmd,...)
> argv[argc] = NULL;
> return execv_cmd(argv);
> }
> +
> +/* The caller is responsible to free the returned buffer */
> +char *get_exec_abs_path(void)
> +{
we have perf_exe for the whole perf binary, so let's call this perf_exe_path
> + int ret;
> + int i;
> + char *buf;
> +
> + buf = malloc(PATH_MAX);
> + ret = readlink("/proc/self/exe", buf, PATH_MAX - 1);
> + if (ret <= 0) {
> + free(buf);
> + return NULL;
> + }
you could call perf_exe for this ^^^
> +
> + for (i = ret - 1; buf[i] != '/'; i--);
> +
> + buf[i + 1] = 0;
> +
> + return buf;
> +}
> diff --git a/tools/lib/subcmd/exec-cmd.h b/tools/lib/subcmd/exec-cmd.h
> index aba591b8d254..9dc98248dadf 100644
> --- a/tools/lib/subcmd/exec-cmd.h
> +++ b/tools/lib/subcmd/exec-cmd.h
> @@ -13,5 +13,6 @@ extern int execl_cmd(const char *cmd, ...);
> /* get_argv_exec_path and system_path return malloc'd string, caller must free it */
> extern char *get_argv_exec_path(void);
> extern char *system_path(const char *path);
> +extern char *get_exec_abs_path(void);
>
> #endif /* __SUBCMD_EXEC_CMD_H */
> diff --git a/tools/perf/Build b/tools/perf/Build
> index db61dbe2b543..56d0189f1029 100644
> --- a/tools/perf/Build
> +++ b/tools/perf/Build
> @@ -45,7 +45,6 @@ CFLAGS_perf.o += -DPERF_HTML_PATH="BUILD_STR($(htmldir_SQ))" \
> -DPREFIX="BUILD_STR($(prefix_SQ))"
> CFLAGS_builtin-trace.o += -DSTRACE_GROUPS_DIR="BUILD_STR($(STRACE_GROUPS_DIR_SQ))"
> CFLAGS_builtin-report.o += -DTIPDIR="BUILD_STR($(tipdir_SQ))"
> -CFLAGS_builtin-report.o += -DDOCDIR="BUILD_STR($(srcdir_SQ)/Documentation)"
>
> perf-y += util/
> perf-y += arch/
> diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
> index f6e609673de2..c9e3aae6c47f 100644
> --- a/tools/perf/Makefile.perf
> +++ b/tools/perf/Makefile.perf
> @@ -627,6 +627,9 @@ $(OUTPUT)python/perf.so: $(PYTHON_EXT_SRCS) $(PYTHON_EXT_DEPS) $(LIBTRACEEVENT_D
> --quiet build_ext; \
> cp $(PYTHON_EXTBUILD_LIB)perf*.so $(OUTPUT)python/
>
> +_dummy := $(shell [ -d '$(OUTPUT)Documentation' ] || (mkdir -p '$(OUTPUT)Documentation' && \
> + cp '$(srcdir)/Documentation/tips.txt' '$(OUTPUT)Documentation/'))
> +
why do we need this? also should be in Documentation make
> please_set_SHELL_PATH_to_a_more_modern_shell:
> $(Q)$$(:)
>
> diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
> index 2a845d6cac09..d9441055357e 100644
> --- a/tools/perf/builtin-report.c
> +++ b/tools/perf/builtin-report.c
> @@ -610,12 +610,27 @@ static int report__browse_hists(struct report *rep)
> struct perf_session *session = rep->session;
> struct evlist *evlist = session->evlist;
> const char *help = perf_tip(system_path(TIPDIR));
> + char *exec_path;
> + char *docdir;
>
> if (help == NULL) {
> /* fallback for people who don't install perf ;-) */
> - help = perf_tip(DOCDIR);
> - if (help == NULL)
> - help = "Cannot load tips.txt file, please install perf!";
> + exec_path = get_exec_abs_path();
> + if (exec_path == NULL || asprintf(&docdir, "%sDocumentation", exec_path) < 0) {
> + docdir = NULL;
> + help = "Not enough memory or some other internal error occurred!";
> + }
> +
> + if (docdir != NULL) {
> + help = perf_tip(docdir);
> + if (help == NULL)
> + help = "Cannot load tips.txt file, please install perf!";
> + }
> +
> + if (exec_path)
> + free(exec_path);
> + if (docdir)
> + free(docdir);
> }
>
> switch (use_browser) {
> diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build
> index 650aec19d490..a20098dcdbc4 100644
> --- a/tools/perf/tests/Build
> +++ b/tools/perf/tests/Build
> @@ -98,5 +98,5 @@ perf-$(CONFIG_DWARF_UNWIND) += dwarf-unwind.o
> endif
>
> CFLAGS_attr.o += -DBINDIR="BUILD_STR($(bindir_SQ))" -DPYTHON="BUILD_STR($(PYTHON_WORD))"
> -CFLAGS_python-use.o += -DPYTHONPATH="BUILD_STR($(OUTPUT)python)" -DPYTHON="BUILD_STR($(PYTHON_WORD))"
> +CFLAGS_python-use.o += -DPYTHON="BUILD_STR($(PYTHON_WORD))"
> CFLAGS_dwarf-unwind.o += -fno-optimize-sibling-calls
> diff --git a/tools/perf/tests/python-use.c b/tools/perf/tests/python-use.c
> index 98c6d474aa6f..8b4865c90d5d 100644
> --- a/tools/perf/tests/python-use.c
> +++ b/tools/perf/tests/python-use.c
> @@ -8,16 +8,28 @@
> #include <linux/compiler.h>
> #include "tests.h"
> #include "util/debug.h"
> +#include <subcmd/exec-cmd.h>
>
> int test__python_use(struct test *test __maybe_unused, int subtest __maybe_unused)
> {
> char *cmd;
> int ret;
> + char *exec_path = NULL;
> + char *pythonpath;
> +
> + exec_path = get_exec_abs_path();
> + if (exec_path == NULL)
> + return -1;
> +
> + if (asprintf(&pythonpath, "%spython", exec_path) < 0)
are we sure there's always trailing '/' in exec_path ?
> + return -1;
>
> if (asprintf(&cmd, "echo \"import sys ; sys.path.append('%s'); import perf\" | %s %s",
> - PYTHONPATH, PYTHON, verbose > 0 ? "" : "2> /dev/null") < 0)
> + pythonpath, PYTHON, verbose > 0 ? "" : "2> /dev/null") < 0)
> return -1;
>
> + free(exec_path);
> + free(pythonpath);
> pr_debug("python usage test: \"%s\"\n", cmd);
> ret = system(cmd) ? -1 : 0;
> free(cmd);
> diff --git a/tools/perf/util/Build b/tools/perf/util/Build
> index e3e12f9d4733..11ad0fdaf71e 100644
> --- a/tools/perf/util/Build
> +++ b/tools/perf/util/Build
> @@ -197,6 +197,10 @@ CFLAGS_llvm-utils.o += -DPERF_INCLUDE_DIR="BUILD_STR($(perf_include_dir_SQ))"
> # avoid compiler warnings in 32-bit mode
> CFLAGS_genelf_debug.o += -Wno-packed
>
> +ifeq ($(shell expr $(shell $(BISON) --version | grep bison | sed -e 's/.\+ \([0-9]\+\).\([0-9]\+\).\([0-9]\+\)/\1\2\3/g') \>\= 371), 1)
> + BISON_FILE_PREFIX_MAP := --file-prefix-map=$(OUTPUT)=
> +endif
seems too small for feature detection, but please add it to
Makefile.config and make new variable under .config-detected
thanks,
jirka
> +
> $(OUTPUT)util/parse-events-flex.c $(OUTPUT)util/parse-events-flex.h: util/parse-events.l $(OUTPUT)util/parse-events-bison.c
> $(call rule_mkdir)
> $(Q)$(call echo-cmd,flex)$(FLEX) -o $(OUTPUT)util/parse-events-flex.c \
> @@ -204,7 +208,7 @@ $(OUTPUT)util/parse-events-flex.c $(OUTPUT)util/parse-events-flex.h: util/parse-
>
> $(OUTPUT)util/parse-events-bison.c $(OUTPUT)util/parse-events-bison.h: util/parse-events.y
> $(call rule_mkdir)
> - $(Q)$(call echo-cmd,bison)$(BISON) -v $< -d $(PARSER_DEBUG_BISON) \
> + $(Q)$(call echo-cmd,bison)$(BISON) -v $< -d $(PARSER_DEBUG_BISON) $(BISON_FILE_PREFIX_MAP) \
> -o $(OUTPUT)util/parse-events-bison.c -p parse_events_
>
> $(OUTPUT)util/expr-flex.c $(OUTPUT)util/expr-flex.h: util/expr.l $(OUTPUT)util/expr-bison.c
> @@ -214,7 +218,7 @@ $(OUTPUT)util/expr-flex.c $(OUTPUT)util/expr-flex.h: util/expr.l $(OUTPUT)util/e
>
> $(OUTPUT)util/expr-bison.c $(OUTPUT)util/expr-bison.h: util/expr.y
> $(call rule_mkdir)
> - $(Q)$(call echo-cmd,bison)$(BISON) -v $< -d $(PARSER_DEBUG_BISON) \
> + $(Q)$(call echo-cmd,bison)$(BISON) -v $< -d $(PARSER_DEBUG_BISON) $(BISON_FILE_PREFIX_MAP) \
> -o $(OUTPUT)util/expr-bison.c -p expr_
>
> $(OUTPUT)util/pmu-flex.c $(OUTPUT)util/pmu-flex.h: util/pmu.l $(OUTPUT)util/pmu-bison.c
> @@ -224,7 +228,7 @@ $(OUTPUT)util/pmu-flex.c $(OUTPUT)util/pmu-flex.h: util/pmu.l $(OUTPUT)util/pmu-
>
> $(OUTPUT)util/pmu-bison.c $(OUTPUT)util/pmu-bison.h: util/pmu.y
> $(call rule_mkdir)
> - $(Q)$(call echo-cmd,bison)$(BISON) -v $< -d $(PARSER_DEBUG_BISON) \
> + $(Q)$(call echo-cmd,bison)$(BISON) -v $< -d $(PARSER_DEBUG_BISON) $(BISON_FILE_PREFIX_MAP) \
> -o $(OUTPUT)util/pmu-bison.c -p perf_pmu_
>
> FLEX_GE_26 := $(shell expr $(shell $(FLEX) --version | sed -e 's/flex \([0-9]\+\).\([0-9]\+\)/\1\2/g') \>\= 26)
> --
> 2.26.2.Cisco
>
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