linux-kernel - Re: [PATCH 2/2] perf test: Introduce script for java symbol testing

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Date:   Sat, 13 Aug 2022 11:08:22 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 2/2] perf test: Introduce script for java symbol testing

On Fri, Aug 12, 2022 at 02:08:43PM -0700, Ian Rogers wrote:

[...]

> > > +if [ -e "$PWD/tools/perf/libperf-jvmti.so" ]; then
> > > +     LIBJVMTI=$PWD/tools/perf/libperf-jvmti.so
> >
> >
> > Will this only work if we do a:
> >
> > make -C tools/perf

Yes, I think so.

> >
> > ?
> 
> Perhaps, I'm not sure on the correct way to detect the install location.
> The only similar example I know of is:
> https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/tree/tools/perf/tests/builtin-test.c?h=perf/core#n308

Yes, I refered the code in this link.

If user works under Linux source folder, the test will search lib in
the folder $LINUX or $LINUX/tools/perf; and it searchs the installed
libperf-jvmti.so in the folder "$PREFIX/lib64" or "$PREFIX/lib".

I think I can add a more path for searching system lib (e.g. the
libperf-jvmti.so is under /usr/lib/linux-tools-xxx/):

  elif [ -e "/usr/lib/linux-tools-$(uname -a | awk '{ print $3 }' | sed -r 's/-generic//')/libperf-jvmti.so" ]; then
       LIBJVMTI= /usr/lib/linux-tools-$(uname -a | awk '{ print $3 }' | sed -r 's/-generic//')/libperf-jvmti.so

> > +elif [ -e "$PWD/libperf-jvmti.so" ]; then
> > > +     LIBJVMTI=$PWD/libperf-jvmti.so
> > > +elif [ -e "$PREFIX/lib64/libperf-jvmti.so" ]; then
> > > +     LIBJVMTI=$PREFIX/lib64/libperf-jvmti.so
> > > +elif [ -e "$PREFIX/lib/libperf-jvmti.so" ]; then
> > > +     LIBJVMTI=$PREFIX/lib/libperf-jvmti.so
> > > +else
> > > +     echo "Fail to find libperf-jvmti.so"
> > > +     exit 1
> >
> 
> JVMTI is a build option so this should probably be "exit 2" for skip.

Sure, will fix.

Thanks,
Leo