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From: Arnaldo Carvalho de Melo on 2 Mar 2010 13:30
From: Arnaldo Carvalho de Melo <acme(a)redhat.com>

To avoid these error:

[root(a)doppio ~]# perf archive
tar: .build-id/00/00000000000000000000000000000000000000: Cannot stat:
No such file or directory
tar: .build-id/00/00000000000000000000000000000000000000: Cannot stat:
No such file or directory
tar: .build-id/00/00000000000000000000000000000000000000: Cannot stat:
No such file or directory
tar: .build-id/00/00000000000000000000000000000000000000: Cannot stat:
No such file or directory
tar: Exiting with failure status due to previous errors
[root(a)doppio ~]#

More work is needed to support archiving symtabs for binaries without a
build-id, perhaps creating a perf.data UUID + adding build-ids for the
binaries copied into the cache and then have this perf.data session UUID
be a directory with symlinks to the by now calculated build-id of the
files inside it.

Or just do an extra pass and insert the calculated build-ids in the
perf.data header.

Reported-by: Ingo Molnar <mingo(a)elte.hu>
Cc: Frédéric Weisbecker <fweisbec(a)gmail.com>
Cc: Mike Galbraith <efault(a)gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra(a)chello.nl>
Cc: Paul Mackerras <paulus(a)samba.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme(a)redhat.com>
---
tools/perf/perf-archive.sh | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/tools/perf/perf-archive.sh b/tools/perf/perf-archive.sh
index 45fbe2f..910468e 100644
--- a/tools/perf/perf-archive.sh
+++ b/tools/perf/perf-archive.sh
@@ -9,8 +9,9 @@ fi

DEBUGDIR=~/.debug/
BUILDIDS=$(mktemp /tmp/perf-archive-buildids.XXXXXX)
+NOBUILDID=0000000000000000000000000000000000000000

-perf buildid-list -i $PERF_DATA --with-hits > $BUILDIDS
+perf buildid-list -i $PERF_DATA --with-hits | grep -v "^$NOBUILDID " > $BUILDIDS
if [ ! -s $BUILDIDS ] ; then
echo "perf archive: no build-ids found"
rm -f $BUILDIDS
--
1.6.2.5

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Prev: perf_events, x86: Fixup fixed counter constraints
Next: [PATCH 02/12] ahci: Get rid of host->iomap usage