Re: [PATCH 00/12] libperf: Add events to perf/event.h

Arnaldo Carvalho de Melo
2019-08-26T16:18:56Z

Em Mon, Aug 26, 2019 at 01:06:28PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Sun, Aug 25, 2019 at 08:17:40PM +0200, Jiri Olsa escreveu:
> > hi,
> > as a preparation for sampling libperf interface, moving event
> > definitions into the library header. Moving just the kernel
> > non-AUX events now.
> >
> > In order to keep libperf simple, we switch 'u64/u32/u16/u8'
> > types used events to their generic '__u*' versions.
> >
> > Perf added 'u*' types mainly to ease up printing __u64 values
> > as stated in the linux/types.h comment:
> >
> > /*
> > * We define u64 as uint64_t for every architecture
> > * so that we can print it with "%"PRIx64 without getting warnings.
> > *
> > * typedef __u64 u64;
> > * typedef __s64 s64;
> > */
> >
> > Adding and using new PRI_lu64 and PRI_lx64 macros to be used for
> > that. Using extra '_' to ease up the reading and differentiate
> > them from standard PRI*64 macros.
>
> So, this is not building on android env:
>
> builtin-sched.c: In function 'process_lost':
> builtin-sched.c:2646:2: error: unknown conversion type character 'l' in format [-Werror=format=]
> printf("lost %" PRI_lu64 " events on cpu %d\n", event->lost.lost, sample->cpu);
> ^
> builtin-sched.c:2646:2: error: format '%d' expects argument of type 'int', but argument 2 has type '__u64' [-Werror=format=]
> builtin-sched.c:2646:2: error: too many arguments for format [-Werror=format-extra-args]
> MKDIR /tmp/build/perf/util/
>
>
> [perfbuilder@490c2c7bdaab ~]$ /opt/android-ndk-r12b//toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc -v
> Using built-in specs.
> COLLECT_GCC=/opt/android-ndk-r12b//toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc
> COLLECT_LTO_WRAPPER=/opt/android-ndk-r12b/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../libexec/gcc/arm-linux-androideabi/4.9.x/lto-wrapper
> Target: arm-linux-androideabi
> Configured with: /usr/local/google/buildbot/src/android/gcc/toolchain/build/../gcc/gcc-4.9/configure --prefix=/tmp/59719db9ae19ff43aef46bbcb79596b6 --target=arm-linux-androideabi --host=x86_64-linux-gnu --build=x86_64-linux-gnu --with-gnu-as --with-gnu-ld --enable-languages=c,c++ --with-gmp=/buildbot/tmp/build/toolchain/temp-install --with-mpfr=/buildbot/tmp/build/toolchain/temp-install --with-mpc=/buildbot/tmp/build/toolchain/temp-install --with-cloog=/buildbot/tmp/build/toolchain/temp-install --with-isl=/buildbot/tmp/build/toolchain/temp-install --with-ppl=/buildbot/tmp/build/toolchain/temp-install --disable-ppl-version-check --disable-cloog-version-check --disable-isl-version-check --enable-cloog-backend=isl --with-host-libstdcxx='-static-libgcc -Wl,-Bstatic,-lstdc++,-Bdynamic -lm' --disable-libssp --enable-threads --disable-nls --disable-libmudflap --disable-libgomp --disable-libstdc__-v3 --disable-sjlj-exceptions --disable-shared --disable-tls --disable-libitm --with-float=soft --with-fpu=vfp --with-arch=armv5te --enable-target-optspace --enable-bionic-libs --enable-libatomic-ifuncs=no --enable-initfini-array --disable-nls --prefix=/tmp/59719db9ae19ff43aef46bbcb79596b6 --with-sysroot=/tmp/59719db9ae19ff43aef46bbcb79596b6/sysroot --with-binutils-version=2.25 --with-mpfr-version=3.1.1 --with-mpc-version=1.0.1 --with-gmp-version=5.0.5 --with-gcc-version=4.9 --with-gdb-version=none --with-gxx-include-dir=/tmp/59719db9ae19ff43aef46bbcb79596b6/include/c++/4.9.x --with-bugurl=http://source.android.com/source/report-bugs.html --enable-languages=c,c++ --disable-bootstrap --enable-plugins --enable-libgomp --enable-gnu-indirect-function --disable-libsanitizer --enable-gold --enable-threads --enable-eh-frame-hdr-for-static --enable-graphite=yes --with-isl-version=0.11.1 --with-cloog-version=0.18.0 --with-arch=armv5te --program-transform-name='s&^&arm-linux-androideabi-&' --enable-gold=default
> Thread model: posix
> gcc version 4.9.x 20150123 (prerelease) (GCC)
> [perfbuilder@490c2c7bdaab ~]$
>
> It doesn't build on the r15b as well.
>
> I'll investigate after lunch.

$ make $EXTRA_MAKE_ARGS ARCH=$ARCH CROSS_COMPILE=$CROSS_COMPILE EXTRA_CFLAGS="$EXTRA_CFLAGS" -C /git/perf/tools/perf O=/tmp/build/perf /tmp/build/perf/builtin-sched.i

We end up with one 'l' too many?

[perfbuilder@490c2c7bdaab ~]$ grep 'printf("lost' /tmp/build/perf/builtin-sched.i
printf("lost %" "l" "ll""u" " events on cpu %d\n", event->lost.lost, sample->cpu);
[perfbuilder@490c2c7bdaab ~]$

And if we do this on a fedora:30 x86_64:

$ make -C tools/perf O=/tmp/build/perf /tmp/build/perf/builtin-sched.i
[acme@quaco perf]$ grep -A4 'printf("lost' /tmp/build/perf/builtin-sched.i
printf("lost %" "l"
# 2646 "builtin-sched.c" 3 4
"l" "u"
# 2646 "builtin-sched.c"
" events on cpu %d\n", event->lost.lost, sample->cpu);
[acme@quaco perf]$

I.e. on 32-bit arches we shouldn't add that extra "l", right?

I bet the build for the mips/mipsel will fail too, lemme see... Yeah,
both failed:

[root@quaco ~]# grep -m1 -A6 -- -Werror=format= dm.log/debian\:experimental-x-mips
builtin-sched.c:2646:9: error: unknown conversion type character 'l' in format [-Werror=format=]
printf("lost %" PRI_lu64 " events on cpu %d\n", event->lost.lost, sample->cpu);
^~~~~~~~
In file included from builtin-sched.c:31:
/usr/mips-linux-gnu/include/inttypes.h:47:28: note: format string is defined here
# define __PRI64_PREFIX "ll"
^
[root@quaco ~]#

[root@quaco ~]# grep -m1 -A6 -- -Werror=format= dm.log/debian\:experimental-x-mipsel
builtin-sched.c:2646:9: error: unknown conversion type character 'l' in format [-Werror=format=]
printf("lost %" PRI_lu64 " events on cpu %d\n", event->lost.lost, sample->cpu);
^~~~~~~~
In file included from builtin-sched.c:31:
/usr/mipsel-linux-gnu/include/inttypes.h:47:28: note: format string is defined here
# define __PRI64_PREFIX "ll"
^
[root@quaco ~]#

And also on a uclibc ARC arch container:

[root@quaco ~]# grep -m1 -A6 -- -Werror=format= dm.log/fedora\:24-x-ARC-uClibc
builtin-sched.c:2646:9: error: unknown conversion type character 'l' in format [-Werror=format=]
printf("lost %" PRI_lu64 " events on cpu %d\n", event->lost.lost, sample->cpu);
^~~~~~~~
In file included from builtin-sched.c:31:0:
/arc_gnu_2017.09-rc2_prebuilt_uclibc_le_arc700_linux_install/arc-snps-linux-uclibc/sysroot/usr/include/inttypes.h:47:28: note: format string is defined here
# define __PRI64_PREFIX "ll"
^
[root@quaco ~]#

The _fix_ will come after lunch :)

- Arnaldo