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perf inject: Try chroot directory when reading build-id

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When reading build-id from a DSO, it should consider if it's from a
chroot task.  In that case, the path is different so it needs to prepend
the root directory to access the file correctly.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20220202070828.143303-4-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2022-02-01 23:08:27 -08:00 committed by Arnaldo Carvalho de Melo
parent 67fd189246
commit 75d48c5670
1 changed files with 10 additions and 0 deletions
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10
tools/perf/builtin-inject.c
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@ -25,6 +25,7 @@
#include "util/synthetic-events.h"
#include "util/thread.h"
#include "util/namespaces.h"
#include "util/util.h"
#include <linux/err.h>
#include <subcmd/parse-options.h>
@ -550,6 +551,15 @@ static int dso__read_build_id(struct dso *dso)
nsinfo__mountns_enter(dso->nsinfo, &nsc);
if (filename__read_build_id(dso->long_name, &dso->bid) > 0)
dso->has_build_id = true;
else if (dso->nsinfo) {
char *new_name;
new_name = filename_with_chroot(dso->nsinfo->pid,
dso->long_name);
if (new_name && filename__read_build_id(new_name, &dso->bid) > 0)
dso->has_build_id = true;
free(new_name);
}
nsinfo__mountns_exit(&nsc);
return dso->has_build_id ? 0 : -1;