linux-kernel - [PATCH] perf kmem: pass additional arguments to record

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Message-Id: <20200708183919.4141023-1-irogers@google.com>
Date:   Wed,  8 Jul 2020 11:39:19 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org
Cc:     Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH] perf kmem: pass additional arguments to record

perf kmem has an input file option but current an output file option
fails:
```
$ sudo perf kmem record -o /tmp/p.data sleep 1  
 Error: unknown switch `o'

Usage: perf kmem [<options>] {record|stat}

   -f, --force           don't complain, do it
   -i, --input <file>    input file name
   -l, --line <num>      show n lines
   -s, --sort <key[,key2...]>
                         sort by keys: ptr, callsite, bytes, hit, pingpong, frag, page, order, mig>
   -v, --verbose         be more verbose (show symbol address, etc)
       --alloc           show per-allocation statistics
       --caller          show per-callsite statistics
       --live            Show live page stat
       --page            Analyze page allocator
       --raw-ip          show raw ip instead of symbol
       --slab            Analyze slab allocator
       --time <str>      Time span of interest (start,stop)
```
perf sched is similar in implementation and avoids the problem by
passing additional arguments to perf record. This change makes perf kmem
parse command line options consistently with perf sched, although
neither actually list that -o is a supported option.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/builtin-kmem.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index 38a5ab683ebc..a50dae2c4ae9 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -1933,7 +1933,8 @@ int cmd_kmem(int argc, const char **argv)
 		return ret;
 
 	argc = parse_options_subcommand(argc, argv, kmem_options,
-					kmem_subcommands, kmem_usage, 0);
+					kmem_subcommands, kmem_usage,
+					PARSE_OPT_STOP_AT_NON_OPTION);
 
 	if (!argc)
 		usage_with_options(kmem_usage, kmem_options);
-- 
2.27.0.383.g050319c2ae-goog