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authorArnaldo Carvalho de Melo <acme@redhat.com>2019-06-10 15:37:45 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2019-06-10 17:50:04 -0300
commit04c41bcb862bbec1fb225243ecf07a3219593f81 (patch)
tree36495a6f7e9be15c8fa10a0f414695ef96e7b18c
parent180ca71cf1be6030ba7eb4515bf2224c07b62631 (diff)
downloadcoresight-core-jun11.tar.gz
perf trace: Skip unknown syscalls when expanding strace like syscall groupscore-jun11
We have $INSTALL_DIR/share/perf-core/strace/groups/string files with syscalls that should be selected when 'string' is used, meaning, in this case, syscalls that receive as one of its arguments a string, like a pathname. But those were first selected and tested on x86_64, and end up failing in architectures where some of those syscalls are not available, like the 'access' syscall on arm64, which makes using 'perf trace -e string' in such archs to fail. Since this the routine doing the validation is used only when reading such files, do not fail when some syscall is not found in the syscalltbl, instead just use pr_debug() to register that in case people are suspicious of problems. Now using 'perf trace -e string' should work on arm64, selecting only the syscalls that have a string and are available on that architecture. Reported-by: Leo Yan <leo.yan@linaro.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Martin KaFai Lau <kafai@fb.com> Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Mike Leach <mike.leach@linaro.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Song Liu <songliubraving@fb.com> Cc: Suzuki K Poulose <suzuki.poulose@arm.com> Cc: Yonghong Song <yhs@fb.com> Link: https://lkml.kernel.org/r/20190610184754.GU21245@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r--tools/perf/builtin-trace.c25
1 files changed, 13 insertions, 12 deletions
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 1a2a605cf068..eb70a4b71755 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1529,6 +1529,7 @@ static int trace__read_syscall_info(struct trace *trace, int id)
static int trace__validate_ev_qualifier(struct trace *trace)
{
int err = 0, i;
+ bool printed_invalid_prefix = false;
size_t nr_allocated;
struct str_node *pos;
@@ -1555,14 +1556,15 @@ static int trace__validate_ev_qualifier(struct trace *trace)
if (id >= 0)
goto matches;
- if (err == 0) {
- fputs("Error:\tInvalid syscall ", trace->output);
- err = -EINVAL;
+ if (!printed_invalid_prefix) {
+ pr_debug("Skipping unknown syscalls: ");
+ printed_invalid_prefix = true;
} else {
- fputs(", ", trace->output);
+ pr_debug(", ");
}
- fputs(sc, trace->output);
+ pr_debug("%s", sc);
+ continue;
}
matches:
trace->ev_qualifier_ids.entries[i++] = id;
@@ -1591,15 +1593,14 @@ matches:
}
}
- if (err < 0) {
- fputs("\nHint:\ttry 'perf list syscalls:sys_enter_*'"
- "\nHint:\tand: 'man syscalls'\n", trace->output);
-out_free:
- zfree(&trace->ev_qualifier_ids.entries);
- trace->ev_qualifier_ids.nr = 0;
- }
out:
+ if (printed_invalid_prefix)
+ pr_debug("\n");
return err;
+out_free:
+ zfree(&trace->ev_qualifier_ids.entries);
+ trace->ev_qualifier_ids.nr = 0;
+ goto out;
}
/*