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gcov: fix documentation

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Commonly available versions of cp and tar don't work well with special
files created using seq_file.  Mention this problem in the gcov
documentation and update the helper script example to work around these
problems.

Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Peter Oberparleiter 2009-06-30 11:41:20 -07:00 committed by Linus Torvalds
parent b01e8dc343
commit 972c71a318
1 changed files with 16 additions and 9 deletions
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25
Documentation/gcov.txt
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@ -188,13 +188,18 @@ Solution: Exclude affected source files from profiling by specifying
GCOV_PROFILE := n or GCOV_PROFILE_basename.o := n in the
corresponding Makefile.
Problem: Files copied from sysfs appear empty or incomplete.
Cause: Due to the way seq_file works, some tools such as cp or tar
may not correctly copy files from sysfs.
Solution: Use 'cat' to read .gcda files and 'cp -d' to copy links.
Alternatively use the mechanism shown in Appendix B.
Appendix A: gather_on_build.sh
==============================
Sample script to gather coverage meta files on the build machine
(see 6a):
#!/bin/bash
KSRC=$1
@ -226,7 +231,7 @@ Appendix B: gather_on_test.sh
Sample script to gather coverage data files on the test machine
(see 6b):
#!/bin/bash
#!/bin/bash -e
DEST=$1
GCDA=/sys/kernel/debug/gcov
@ -236,11 +241,13 @@ if [ -z "$DEST" ] ; then
exit 1
fi
find $GCDA -name '*.gcno' -o -name '*.gcda' | tar cfz $DEST -T -
TEMPDIR=$(mktemp -d)
echo Collecting data..
find $GCDA -type d -exec mkdir -p $TEMPDIR/\{\} \;
find $GCDA -name '*.gcda' -exec sh -c 'cat < $0 > '$TEMPDIR'/$0' {} \;
find $GCDA -name '*.gcno' -exec sh -c 'cp -d $0 '$TEMPDIR'/$0' {} \;
tar czf $DEST -C $TEMPDIR sys
rm -rf $TEMPDIR
if [ $? -eq 0 ] ; then
echo "$DEST successfully created, copy to build system and unpack with:"
echo " tar xfz $DEST"
else
echo "Could not create file $DEST"
fi
echo "$DEST successfully created, copy to build system and unpack with:"
echo " tar xfz $DEST"