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perf script: Fix export of callchains with recursion in db-export 

When an IP with an unresolved symbol occurs in the callchain more than
once (ie. recursion), then duplicate symbols can be created because
the callchain nodes are never updated after they are first created.

To fix this issue we call dso__find_symbol whenever we encounter a NULL
symbol, in case we already added a symbol at that IP since we started
traversing the callchain.

This change prevents duplicate symbols from being exported when duplicate
IPs are present in the callchain.

Signed-off-by: Chris Phlipot <cphlipot0@gmail.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1462937209-6032-5-git-send-email-cphlipot0@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Chris Phlipot 2016-05-10 20:26:49 -07:00 committed by Arnaldo Carvalho de Melo
parent 7a2544c004
commit 83302e79b1
1 changed files with 4 additions and 0 deletions
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4
tools/perf/util/db-export.c
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@ -326,6 +326,10 @@ static struct call_path *call_path_from_sample(struct db_export *dbe,
al.machine = machine;
al.addr = node->ip;
if (al.map && !al.sym)
al.sym = dso__find_symbol(al.map->dso, MAP__FUNCTION,
al.addr);
db_ids_from_al(dbe, &al, &dso_db_id, &sym_db_id, &offset);
/* add node to the call path tree if it doesn't exist */