Re: [PATCH] perf buildid-cache: Add test for PE executable

[Arnaldo Carvalho de Melo]

Em Thu, Feb 25, 2021 at 09:35:04PM +0100, Jiri Olsa escreveu:
> On Wed, Feb 24, 2021 at 02:59:16PM -0500, Nicholas Fraser wrote:
> > From 9fd0b3889f00ad13662879767d833309d8a035b6 Mon Sep 17 00:00:00 2001
> > From: Nicholas Fraser <nfraser@xxxxxxxxxxxxxxx>
> > Date: Thu, 18 Feb 2021 13:24:03 -0500
> > Subject: [PATCH] perf buildid-cache: Add test for PE executable
> > 
> > This builds on the previous changes to tests/shell/buildid.sh, adding
> > tests for a PE file. It adds it to the build-id cache manually and, if
> > Wine is available, runs it under "perf record" and verifies that it was
> > added automatically.
> > 
> > If wine is not installed, only warnings are printed; the test can still
> > exit 0.
> > 
> > Signed-off-by: Nicholas Fraser <nfraser@xxxxxxxxxxxxxxx>
> 
> works nicely now, thanks
> 
> Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>

Thanks for checking it, but if you did a review, i.e. if you looked at
the code, made suggestions, the submitter acted upon those changes, you
looked again, etc, shouldn't this be a more appropriate:

Reviewed-by: Jiri Olsa <jolsa@xxxxxxxxxx>

?

I think we need to make these tags reflect more what really happened,
i.e. if you just glanced over and thought, quickly, that it seems
okayish, then Acked-by is what we should use, but if you gone thru the
trouble of actually _looking hard_ at it, sometimes multiple times, then
we should really use Reviewed-by and not take that lightly.

- Arnaldo

 
> jirka
> 
> > ---
> >  tools/perf/tests/shell/buildid.sh | 65 +++++++++++++++++++++++++++----
> >  1 file changed, 58 insertions(+), 7 deletions(-)
> > 
> > diff --git a/tools/perf/tests/shell/buildid.sh b/tools/perf/tests/shell/buildid.sh
> > index 416af614bbe0..f05670d1e39e 100755
> > --- a/tools/perf/tests/shell/buildid.sh
> > +++ b/tools/perf/tests/shell/buildid.sh
> > @@ -14,18 +14,56 @@ if ! [ -x "$(command -v cc)" ]; then
> >  	exit 2
> >  fi
> >  
> > +# check what we need to test windows binaries
> > +add_pe=1
> > +run_pe=1
> > +if ! perf version --build-options | grep -q 'libbfd: .* on '; then
> > +	echo "WARNING: perf not built with libbfd. PE binaries will not be tested."
> > +	add_pe=0
> > +	run_pe=0
> > +fi
> > +if ! which wine > /dev/null; then
> > +	echo "WARNING: wine not found. PE binaries will not be run."
> > +	run_pe=0
> > +fi
> > +
> > +# set up wine
> > +if [ ${run_pe} -eq 1 ]; then
> > +	wineprefix=$(mktemp -d /tmp/perf.wineprefix.XXX)
> > +	export WINEPREFIX=${wineprefix}
> > +	# clear display variables to prevent wine from popping up dialogs
> > +	unset DISPLAY
> > +	unset WAYLAND_DISPLAY
> > +fi
> > +
> >  ex_md5=$(mktemp /tmp/perf.ex.MD5.XXX)
> >  ex_sha1=$(mktemp /tmp/perf.ex.SHA1.XXX)
> > +ex_pe=$(dirname $0)/../pe-file.exe
> >  
> >  echo 'int main(void) { return 0; }' | cc -Wl,--build-id=sha1 -o ${ex_sha1} -x c -
> >  echo 'int main(void) { return 0; }' | cc -Wl,--build-id=md5 -o ${ex_md5} -x c -
> >  
> > -echo "test binaries: ${ex_sha1} ${ex_md5}"
> > +echo "test binaries: ${ex_sha1} ${ex_md5} ${ex_pe}"
> >  
> >  check()
> >  {
> > -	id=`readelf -n ${1} 2>/dev/null | grep 'Build ID' | awk '{print $3}'`
> > -
> > +	case $1 in
> > +	*.exe)
> > +		# We don't have a tool that can pull a nicely formatted build-id out of
> > +		# a PE file, but we can extract the whole section with objcopy and
> > +		# format it ourselves. The .buildid section is a Debug Directory
> > +		# containing a CodeView entry:
> > +		#     https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#debug-directory-image-only
> > +		#     https://github.com/dotnet/runtime/blob/da94c022576a5c3bbc0e896f006565905eb137f9/docs/design/specs/PE-COFF.md
> > +		# The build-id starts at byte 33 and must be rearranged into a GUID.
> > +		id=`objcopy -O binary --only-section=.buildid $1 /dev/stdout | \
> > +			cut -c 33-48 | hexdump -ve '/1 "%02x"' | \
> > +			sed 's@^\(..\)\(..\)\(..\)\(..\)\(..\)\(..\)\(..\)\(..\)\(.*\)0a$@\4\3\2\1\6\5\8\7\9@'`
> > +		;;
> > +	*)
> > +		id=`readelf -n ${1} 2>/dev/null | grep 'Build ID' | awk '{print $3}'`
> > +		;;
> > +	esac
> >  	echo "build id: ${id}"
> >  
> >  	link=${build_id_dir}/.build-id/${id:0:2}/${id:2}
> > @@ -50,7 +88,7 @@ check()
> >  		exit 1
> >  	fi
> >  
> > -	${perf} buildid-cache -l | grep $id
> > +	${perf} buildid-cache -l | grep ${id}
> >  	if [ $? -ne 0 ]; then
> >  		echo "failed: ${id} is not reported by \"perf buildid-cache -l\""
> >  		exit 1
> > @@ -79,16 +117,20 @@ test_record()
> >  {
> >  	data=$(mktemp /tmp/perf.data.XXX)
> >  	build_id_dir=$(mktemp -d /tmp/perf.debug.XXX)
> > +	log=$(mktemp /tmp/perf.log.XXX)
> >  	perf="perf --buildid-dir ${build_id_dir}"
> >  
> > -	${perf} record --buildid-all -o ${data} ${1}
> > +	echo "running: perf record $@"
> > +	${perf} record --buildid-all -o ${data} $@ &> ${log}
> >  	if [ $? -ne 0 ]; then
> > -		echo "failed: record ${1}"
> > +		echo "failed: record $@"
> > +		echo "see log: ${log}"
> >  		exit 1
> >  	fi
> >  
> > -	check ${1}
> > +	check ${@: -1}
> >  
> > +	rm -f ${log}
> >  	rm -rf ${build_id_dir}
> >  	rm -rf ${data}
> >  }
> > @@ -96,12 +138,21 @@ test_record()
> >  # add binaries manual via perf buildid-cache -a
> >  test_add ${ex_sha1}
> >  test_add ${ex_md5}
> > +if [ ${add_pe} -eq 1 ]; then
> > +	test_add ${ex_pe}
> > +fi
> >  
> >  # add binaries via perf record post processing
> >  test_record ${ex_sha1}
> >  test_record ${ex_md5}
> > +if [ ${run_pe} -eq 1 ]; then
> > +	test_record wine ${ex_pe}
> > +fi
> >  
> >  # cleanup
> >  rm ${ex_sha1} ${ex_md5}
> > +if [ ${run_pe} -eq 1 ]; then
> > +	rm -r ${wineprefix}
> > +fi
> >  
> >  exit ${err}
> > -- 
> > 2.30.1
> > 
> > 
> 

-- 

- Arnaldo