linux-kernel - Re: [PATCH V7 01/14] rtla: Real-Time Linux Analysis tool

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Message-ID: <20211124162814.352ad8fd@gandalf.local.home>
Date:   Wed, 24 Nov 2021 16:28:14 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Daniel Bristot de Oliveira <bristot@...nel.org>
Cc:     Tao Zhou <tao.zhou@...ux.dev>, Ingo Molnar <mingo@...hat.com>,
        Tom Zanussi <zanussi@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Clark Williams <williams@...hat.com>,
        John Kacur <jkacur@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        linux-rt-users@...r.kernel.org, linux-trace-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V7 01/14] rtla: Real-Time Linux Analysis tool

On Fri, 29 Oct 2021 21:26:04 +0200
Daniel Bristot de Oliveira <bristot@...nel.org> wrote:

> The rtla is a meta-tool that includes a set of commands that aims
> to analyze the real-time properties of Linux. But instead of testing
> Linux as a black box, rtla leverages kernel tracing capabilities to
> provide precise information about the properties and root causes of
> unexpected results.
> 
> rtla --help works and provide information about the available options.
> 
> This is just the "main" and the Makefile, no function yet.
> 
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Tom Zanussi <zanussi@...nel.org>
> Cc: Masami Hiramatsu <mhiramat@...nel.org>
> Cc: Juri Lelli <juri.lelli@...hat.com>
> Cc: Clark Williams <williams@...hat.com>
> Cc: John Kacur <jkacur@...hat.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Cc: Daniel Bristot de Oliveira <bristot@...nel.org>
> Cc: linux-rt-users@...r.kernel.org
> Cc: linux-trace-devel@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Daniel Bristot de Oliveira <bristot@...nel.org>
> ---
>  tools/tracing/rtla/Makefile   | 76 +++++++++++++++++++++++++++++++++++
>  tools/tracing/rtla/src/rtla.c | 72 +++++++++++++++++++++++++++++++++
>  2 files changed, 148 insertions(+)
>  create mode 100644 tools/tracing/rtla/Makefile
>  create mode 100644 tools/tracing/rtla/src/rtla.c
> 
> diff --git a/tools/tracing/rtla/Makefile b/tools/tracing/rtla/Makefile
> new file mode 100644
> index 000000000000..33f154f86519
> --- /dev/null
> +++ b/tools/tracing/rtla/Makefile
> @@ -0,0 +1,76 @@
> +NAME	:=	rtla
> +VERSION	:=	0.3
> +
> +# From libtracefs:
> +# Makefiles suck: This macro sets a default value of $(2) for the
> +# variable named by $(1), unless the variable has been set by
> +# environment or command line. This is necessary for CC and AR
> +# because make sets default values, so the simpler ?= approach
> +# won't work as expected.
> +define allow-override
> +  $(if $(or $(findstring environment,$(origin $(1))),\
> +            $(findstring command line,$(origin $(1)))),,\
> +    $(eval $(1) = $(2)))
> +endef
> +
> +# Allow setting CC and AR, or setting CROSS_COMPILE as a prefix.
> +$(call allow-override,CC,$(CROSS_COMPILE)gcc)
> +$(call allow-override,AR,$(CROSS_COMPILE)ar)
> +$(call allow-override,STRIP,$(CROSS_COMPILE)strip)
> +$(call allow-override,PKG_CONFIG,pkg-config)
> +$(call allow-override,LD_SO_CONF_PATH,/etc/ld.so.conf.d/)
> +$(call allow-override,LDCONFIG,ldconfig)
> +
> +INSTALL	=	install
> +FOPTS	:=	-flto=auto -ffat-lto-objects -fexceptions -fstack-protector-strong \
> +		-fasynchronous-unwind-tables -fstack-clash-protection
> +WOPTS	:= 	-Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -Wno-maybe-uninitialized
> +
> +TRACEFS_HEADERS	:= $$($(PKG_CONFIG) --cflags libtracefs)
> +
> +CFLAGS	:=	-O -g -DVERSION=\"$(VERSION)\" $(FOPTS) $(MOPTS) $(WOPTS) $(TRACEFS_HEADERS)
> +LDFLAGS	:=	-ggdb
> +LIBS	:=	-ltracefs -ltraceevent -lprocps

For the -ltracefs and -ltracevent, you could use:

   $$($PKG_CONFIG) --libs libtracefs)

which would be more robust.

-- Steve

> +
> +SRC	:=	$(wildcard src/*.c)
> +HDR	:=	$(wildcard src/*.h)
> +OBJ	:=	$(SRC:.c=.o)
> +DIRS	:=	src
> +FILES	:=	Makefile
> +CEXT	:=	bz2
> +TARBALL	:=	$(NAME)-$(VERSION).tar.$(CEXT)
> +TAROPTS	:=	-cvjf $(TARBALL)
> +BINDIR	:=	/usr/bin
> +DATADIR	:=	/usr/share
> +DOCDIR	:=	$(DATADIR)/doc
> +MANDIR	:=	$(DATADIR)/man
> +LICDIR	:=	$(DATADIR)/licenses
> +