From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Clark Williams <williams@redhat.com>,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Adrian Hunter <adrian.hunter@intel.com>,
David Ahern <dsahern@gmail.com>, Jiri Olsa <jolsa@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Wang Nan <wangnan0@huawei.com>
Subject: [PATCH 5/5] perf tools: Add missing newline when parsing empty BPF proggie
Date: Mon, 14 May 2018 09:23:21 -0300 [thread overview]
Message-ID: <20180514122321.27304-6-acme@kernel.org> (raw)
In-Reply-To: <20180514122321.27304-1-acme@kernel.org>
From: Arnaldo Carvalho de Melo <acme@redhat.com>
This is not specific to BPF but was found when parsing a .c BPF proggie
that while valid, had no events attached to tracepoints, kprobes, etc:
Very minimal file that perf's BPF code can compile:
# cat empty.c
char _license[] __attribute__((section("license"), used)) = "GPL";
int _version __attribute__((section("version"), used)) = LINUX_VERSION_CODE;
#
Before this patch:
# perf trace -e empty.c
WARNING: event parser found nothinginvalid or unsupported event: 'empty.c'
Run 'perf list' for a list of valid events
Usage: perf trace [<options>] [<command>]
or: perf trace [<options>] -- <command> [<options>]
or: perf trace record [<options>] [<command>]
or: perf trace record [<options>] -- <command> [<options>]
-e, --event <event> event/syscall selector. use 'perf list' to list available events
#
After:
# perf trace -e empty.c
WARNING: event parser found nothing
invalid or unsupported event: 'empty.c'
Run 'perf list' for a list of valid events
Usage: perf trace [<options>] [<command>]
or: perf trace [<options>] -- <command> [<options>]
or: perf trace record [<options>] [<command>]
or: perf trace record [<options>] -- <command> [<options>]
-e, --event <event> event/syscall selector. use 'perf list' to list available events
#
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-8ysughiz00h6mjpcot04qyjj@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/parse-events.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 2fb0272146d8..b8b8a9558d32 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1715,7 +1715,7 @@ int parse_events(struct perf_evlist *evlist, const char *str,
struct perf_evsel *last;
if (list_empty(&parse_state.list)) {
- WARN_ONCE(true, "WARNING: event parser found nothing");
+ WARN_ONCE(true, "WARNING: event parser found nothing\n");
return -1;
}
--
2.14.3
next prev parent reply other threads:[~2018-05-14 12:23 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-14 12:23 [GIT PULL 0/5] perf/urgent fixes Arnaldo Carvalho de Melo
2018-05-14 12:23 ` [PATCH 1/5] perf test: "probe libc's inet_pton" fails on s390 due to missing inline Arnaldo Carvalho de Melo
2018-05-14 12:23 ` [PATCH 2/5] perf annotate: Display all available events on --stdio Arnaldo Carvalho de Melo
2018-05-14 12:23 ` [PATCH 3/5] perf cs-etm: Support unknown_thread in cs_etm_auxtrace Arnaldo Carvalho de Melo
2018-05-14 12:23 ` [PATCH 4/5] perf cs-etm: Remove redundant space Arnaldo Carvalho de Melo
2018-05-14 12:23 ` Arnaldo Carvalho de Melo [this message]
2018-05-15 6:21 ` [GIT PULL 0/5] perf/urgent fixes Ingo Molnar
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