From: tip-bot for Wang Nan <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, lizefan@huawei.com, ast@kernel.org,
mingo@kernel.org, jolsa@kernel.org, acme@redhat.com,
hekuang@huawei.com, namhyung@kernel.org, tglx@linutronix.de,
masami.hiramatsu.pt@hitachi.com, wangnan0@huawei.com,
hpa@zytor.com, peterz@infradead.org
Subject: [tip:perf/core] perf record: Use WARN_ONCE to replace 'if' condition
Date: Sat, 5 Mar 2016 00:15:54 -0800 [thread overview]
Message-ID: <tip-d8871ea71281ed689dc3303d1b50eb00c5d06141@git.kernel.org> (raw)
In-Reply-To: <1456479154-136027-19-git-send-email-wangnan0@huawei.com>
Commit-ID: d8871ea71281ed689dc3303d1b50eb00c5d06141
Gitweb: http://git.kernel.org/tip/d8871ea71281ed689dc3303d1b50eb00c5d06141
Author: Wang Nan <wangnan0@huawei.com>
AuthorDate: Fri, 26 Feb 2016 09:32:06 +0000
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Thu, 3 Mar 2016 11:10:34 -0300
perf record: Use WARN_ONCE to replace 'if' condition
Commits in a BPF patchkit will extract kernel and module synthesizing
code into a separated function and call it multiple times. This patch
replace 'if (err < 0)' using WARN_ONCE, makes sure the error message
show one time.
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1456479154-136027-19-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-record.c | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 7d11162..9dec7e5 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -33,6 +33,7 @@
#include "util/parse-regs-options.h"
#include "util/llvm-utils.h"
#include "util/bpf-loader.h"
+#include "asm/bug.h"
#include <unistd.h>
#include <sched.h>
@@ -615,17 +616,15 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
machine);
- if (err < 0)
- pr_err("Couldn't record kernel reference relocation symbol\n"
- "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
- "Check /proc/kallsyms permission or run as root.\n");
+ WARN_ONCE(err < 0, "Couldn't record kernel reference relocation symbol\n"
+ "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
+ "Check /proc/kallsyms permission or run as root.\n");
err = perf_event__synthesize_modules(tool, process_synthesized_event,
machine);
- if (err < 0)
- pr_err("Couldn't record kernel module information.\n"
- "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
- "Check /proc/modules permission or run as root.\n");
+ WARN_ONCE(err < 0, "Couldn't record kernel module information.\n"
+ "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
+ "Check /proc/modules permission or run as root.\n");
if (perf_guest) {
machines__process_guests(&session->machines,
next prev parent reply other threads:[~2016-03-05 8:16 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-26 9:31 [PATCH 00/46] perf tools: Fix and improvements (bpf and overwrite) Wang Nan
2016-02-26 9:31 ` [PATCH 01/46] perf tools: Record text offset in dso to calculate objdump address Wang Nan
2016-03-24 7:37 ` [tip:perf/urgent] perf symbols: " tip-bot for Wang Nan
2016-02-26 9:31 ` [PATCH 02/46] perf tools: Adjust symbol for shared objects Wang Nan
2016-02-26 9:31 ` [PATCH 03/46] perf config: Bring perf_default_config to the very beginning at main() Wang Nan
2016-02-27 9:44 ` [tip:perf/core] " tip-bot for Wang Nan
2016-02-26 9:31 ` [PATCH 04/46] perf trace: Improve error message when receive non-tracepoint events Wang Nan
2016-02-26 9:31 ` [PATCH 05/46] perf tools: Only set filter for tracepoints events Wang Nan
2016-02-27 9:45 ` [tip:perf/core] " tip-bot for Wang Nan
2016-02-26 9:31 ` [PATCH 06/46] perf trace: Call bpf__apply_obj_config in 'perf trace' Wang Nan
2016-02-27 9:45 ` [tip:perf/core] " tip-bot for Wang Nan
2016-02-26 9:31 ` [PATCH 07/46] perf trace: Print content of bpf-output event Wang Nan
2016-02-27 9:45 ` [tip:perf/core] " tip-bot for Wang Nan
2016-02-26 9:31 ` [PATCH 08/46] perf data: Support converting data from bpf_perf_event_output() Wang Nan
2016-03-05 8:15 ` [tip:perf/core] " tip-bot for Wang Nan
2016-02-26 9:31 ` [PATCH 09/46] perf data: Explicitly set byte order for integer types Wang Nan
2016-03-05 8:15 ` [tip:perf/core] " tip-bot for Wang Nan
2016-02-26 9:31 ` [PATCH 10/46] perf core: Introduce new ioctl options to pause and resume ring buffer Wang Nan
2016-02-29 15:39 ` Arnaldo Carvalho de Melo
2016-03-03 2:03 ` Wangnan (F)
2016-02-26 9:31 ` [PATCH 11/46] perf core: Set event's default overflow_handler Wang Nan
2016-02-26 9:32 ` [PATCH 12/46] perf core: Prepare writing into ring buffer from end Wang Nan
2016-02-26 9:32 ` [PATCH 13/46] perf core: Add backward attribute to perf event Wang Nan
2016-02-26 9:32 ` [PATCH 14/46] perf core: Reduce perf event output overhead by new overflow handler Wang Nan
2016-02-26 9:32 ` [PATCH 15/46] perf tools: Only validate is_pos for tracking evsels Wang Nan
2016-02-26 9:32 ` [PATCH 16/46] perf tools: Print write_backward value in perf_event_attr__fprintf Wang Nan
2016-02-26 9:32 ` [PATCH 17/46] perf tools: Make ordered_events reusable Wang Nan
2016-02-26 9:32 ` [PATCH 18/46] perf record: Use WARN_ONCE to replace 'if' condition Wang Nan
2016-03-05 8:15 ` tip-bot for Wang Nan [this message]
2016-02-26 9:32 ` [PATCH 19/46] perf record: Extract synthesize code to record__synthesize() Wang Nan
2016-03-05 8:16 ` [tip:perf/core] " tip-bot for Wang Nan
2016-02-26 9:32 ` [PATCH 20/46] perf tools: Add perf_data_file__switch() helper Wang Nan
2016-02-26 9:32 ` [PATCH 21/46] perf record: Turns auxtrace_snapshot_enable into 3 states Wang Nan
2016-02-26 9:32 ` [PATCH 22/46] perf record: Introduce record__finish_output() to finish a perf.data Wang Nan
2016-03-05 8:16 ` [tip:perf/core] " tip-bot for Wang Nan
2016-02-26 9:32 ` [PATCH 23/46] perf record: Add '--timestamp-filename' option to append timestamp to output filename Wang Nan
2016-02-26 9:32 ` [PATCH 24/46] perf record: Split output into multiple files via '--switch-output' Wang Nan
2016-02-26 9:32 ` [PATCH 25/46] perf record: Force enable --timestamp-filename when --switch-output is provided Wang Nan
2016-02-26 9:32 ` [PATCH 26/46] perf record: Disable buildid cache options by default in switch output mode Wang Nan
2016-02-26 9:32 ` [PATCH 27/46] perf record: Re-synthesize tracking events after output switching Wang Nan
2016-02-26 9:32 ` [PATCH 28/46] perf record: Generate tracking events for process forked by perf Wang Nan
2016-02-26 9:32 ` [PATCH 29/46] perf record: Ensure return non-zero rc when mmap fail Wang Nan
2016-03-05 8:17 ` [tip:perf/core] " tip-bot for Wang Nan
2016-02-26 9:32 ` [PATCH 30/46] perf record: Prevent reading invalid data in record__mmap_read Wang Nan
2016-02-26 9:32 ` [PATCH 31/46] perf tools: Add evlist channel helpers Wang Nan
2016-02-26 9:32 ` [PATCH 32/46] perf tools: Automatically add new channel according to evlist Wang Nan
2016-02-26 9:32 ` [PATCH 33/46] perf tools: Operate multiple channels Wang Nan
2016-02-26 9:32 ` [PATCH 34/46] perf tools: Squash overwrite setting into channel Wang Nan
2016-02-26 9:32 ` [PATCH 35/46] perf record: Don't read from and poll overwrite channel Wang Nan
2016-02-26 9:32 ` [PATCH 36/46] perf record: Don't poll on " Wang Nan
2016-02-26 9:32 ` [PATCH 37/46] perf tools: Detect avalibility of write_backward Wang Nan
2016-02-26 9:32 ` [PATCH 38/46] perf tools: Enable overwrite settings Wang Nan
2016-02-26 9:32 ` [PATCH 39/46] perf tools: Set write_backward attribut bit for overwrite events Wang Nan
2016-02-26 9:32 ` [PATCH 40/46] perf tools: Record fd into perf_mmap Wang Nan
2016-02-26 9:32 ` [PATCH 41/46] perf tools: Add API to pause a channel Wang Nan
2016-02-26 9:32 ` [PATCH 42/46] perf record: Toggle overwrite ring buffer for reading Wang Nan
2016-02-26 9:32 ` [PATCH 43/46] perf record: Rename variable to make code clear Wang Nan
2016-02-26 9:32 ` [PATCH 44/46] perf record: Read from backward ring buffer Wang Nan
2016-02-26 9:32 ` [PATCH 45/46] perf record: Allow generate tracking events at the end of output Wang Nan
2016-02-26 9:32 ` [PATCH 46/46] perf tools: Don't warn about out of order event if write_backward is used Wang Nan
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