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perf archive: Correct cutting of symbolic link

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If a '$PERF_BUILDID_DIR'(typically $HOME/.debug) is a symbolic link
directory, cutting of the path will fail.

Here is an example where a buildid directory is a symbolic link.

/ # ls -al /root
lrwxrwxrwx    1 root     root            13 Mar 26  2012 /root -> opt/home/root
/ # cd ~
/opt/home/root # perf record -a -g sleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.322 MB perf.data (~14057 samples) ]
/opt/home/root # perf archive
tar: Removing leading `/' from member names
Now please run:

$ tar xvf perf.data.tar.bz2 -C ~/.debug

wherever you need to run 'perf report' on.
/opt/home/root # mkdir temp
/opt/home/root # tar xf perf.data.tar.bz2 -C ./temp
/opt/home/root # find ./temp -name "*kernel*"
./temp/opt/home/root/.debug/[kernel.kallsyms]

-> If successfully cut off the path, [kernel.kallsyms] is located
in top of the archived file.

This patch enables to cut correctly even if the buildid directory
is a symbolic link.

Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1333348109-12598-1-git-send-email-chanho61.park@samsung.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Chanho Park 2012-04-02 15:28:29 +09:00 committed by Arnaldo Carvalho de Melo
parent 77394ad6e4
commit e3b6193378
1 changed files with 2 additions and 1 deletions
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3
tools/perf/perf-archive.sh
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@ -29,13 +29,14 @@ if [ ! -s $BUILDIDS ] ; then
fi
MANIFEST=$(mktemp /tmp/perf-archive-manifest.XXXXXX)
PERF_BUILDID_LINKDIR=$(readlink -f $PERF_BUILDID_DIR)/
cut -d ' ' -f 1 $BUILDIDS | \
while read build_id ; do
linkname=$PERF_BUILDID_DIR.build-id/${build_id:0:2}/${build_id:2}
filename=$(readlink -f $linkname)
echo ${linkname#$PERF_BUILDID_DIR} >> $MANIFEST
echo ${filename#$PERF_BUILDID_DIR} >> $MANIFEST
echo ${filename#$PERF_BUILDID_LINKDIR} >> $MANIFEST
done
tar cfj $PERF_DATA.tar.bz2 -C $PERF_BUILDID_DIR -T $MANIFEST