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To avoid formatting failures for example in CSV output due to debug
messages, add --output option to put the result in a file.
Unfortunately the short -o option was taken by the --owner already.
$ sudo ./perf lock con -ab --output lock-out.txt -v sleep 1
Looking at the vmlinux_path (8 entries long)
symsrc__init: cannot get elf header.
Using /proc/kcore for kernel data
Using /proc/kallsyms for symbols
$ head lock-out.txt
contended total wait max wait avg wait type caller
3 76.79 us 26.89 us 25.60 us rwlock:R ep_poll_callback+0x2d
0xffffffff9a23f4b5 _raw_read_lock_irqsave+0x45
0xffffffff99bbd4dd ep_poll_callback+0x2d
0xffffffff999029f3 __wake_up_common+0x73
0xffffffff99902b82 __wake_up_common_lock+0x82
0xffffffff99fa5b1c sock_def_readable+0x3c
0xffffffff9a11521d unix_stream_sendmsg+0x18d
0xffffffff99f9fc9c sock_sendmsg+0x5c
Suggested-by: Ian Rogers <irogers@google.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Hao Luo <haoluo@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20230628200141.2739587-4-namhyung@kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
f6027053f8