linux-kernel - [PATCH 27/29] perf trace: Fixup etcsnoop example

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Message-Id: <20190125231843.2895-28-acme@kernel.org>
Date:   Sat, 26 Jan 2019 00:18:41 +0100
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Clark Williams <williams@...hat.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Luis Cláudio Gonçalves 
        <lclaudio@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
        Wang Nan <wangnan0@...wei.com>
Subject: [PATCH 27/29] perf trace: Fixup etcsnoop example

From: Arnaldo Carvalho de Melo <acme@...hat.com>

Where we don't have "raw_syscalls:sys_enter", so we need to look for a
"*syscalls:sys_enter*" to initialize the offsets for the
__augmented_syscalls__ evsel, which is the case with etcsnoop, that was
segfaulting, fixed:

  # trace -e /home/acme/git/perf/tools/perf/examples/bpf/etcsnoop.c
     0.000 (         ): gnome-shell/2105 openat(dfd: CWD, filename: "/etc/localtime")                       ...
   631.834 (         ): cat/6521 openat(dfd: CWD, filename: "/etc/ld.so.cache", flags: RDONLY|CLOEXEC) ...
   632.637 (         ): bash/6521 openat(dfd: CWD, filename: "/etc/passwd")                          ...
  ^C#

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Luis Cláudio Gonçalves <lclaudio@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Wang Nan <wangnan0@...wei.com>
Fixes: b9b6a2ea2baf ("perf trace: Do not hardcode the size of the tracepoint common_ fields")
Link: https://lkml.kernel.org/n/tip-0tjwcit8qitsmh4nyvf2b0jo@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-trace.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index ed4583128b9c..1447993e1ee3 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -3854,7 +3854,8 @@ int cmd_trace(int argc, const char **argv)
 				goto init_augmented_syscall_tp;
 			}
 
-			if (strcmp(perf_evsel__name(evsel), "raw_syscalls:sys_enter") == 0) {
+			if (trace.syscalls.events.augmented->priv == NULL &&
+			    strstr(perf_evsel__name(evsel), "syscalls:sys_enter")) {
 				struct perf_evsel *augmented = trace.syscalls.events.augmented;
 				if (perf_evsel__init_augmented_syscall_tp(augmented, evsel) ||
 				    perf_evsel__init_augmented_syscall_tp_args(augmented))
-- 
2.20.1