[PATCH] perf: sched-pipe add support for packet I/O mode

[Shuah Khan]

Add support to run sched-pipe benchmark test on pipe with packet I/O mode.

Signed-off-by: Shuah Khan <shua...@osg.samsung.com>
---
 tools/perf/bench/sched-pipe.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/tools/perf/bench/sched-pipe.c b/tools/perf/bench/sched-pipe.c
index 1dc2d13..c6e1b7a 100644
--- a/tools/perf/bench/sched-pipe.c
+++ b/tools/perf/bench/sched-pipe.c
@@ -41,9 +41,16 @@ static       int                     loops = LOOPS_DEFAULT;
 /* Use processes by default: */
 static bool                    threaded;
 
+/* Use non-packet (normal) I/O mode by default.
+ * In packet mode, each write is a separate packet.
+ */
+static bool                    packet_mode;
+
 static const struct option options[] = {
        OPT_INTEGER('l', "loop",        &loops,         "Specify number of 
loops"),
        OPT_BOOLEAN('T', "threaded",    &threaded,      "Specify 
threads/process based task setup"),
+       OPT_BOOLEAN('P', "packet mode", &packet_mode,
+                   "Specify packet I/O mode - "),
        OPT_END()
 };
 
@@ -83,6 +90,7 @@ int bench_sched_pipe(int argc, const char **argv, const char 
*prefix __maybe_unu
        unsigned long long result_usec = 0;
        int nr_threads = 2;
        int t;
+       int flags = 0;
 
        /*
         * why does "ret" exist?
@@ -94,6 +102,18 @@ int bench_sched_pipe(int argc, const char **argv, const 
char *prefix __maybe_unu
 
        argc = parse_options(argc, argv, options, bench_sched_pipe_usage, 0);
 
+       if (packet_mode) {
+               /* BUG_ON doesn't make sense exit if pipe2() fails */
+               flags = O_DIRECT;
+               ret = pipe2(pipe_1, flags);
+               if (ret)
+                       exit(1);
+               ret = pipe2(pipe_2, flags);
+               if (ret)
+                       exit(1);
+               printf("Running sched-pipe in packet I/O mode\n\n");
+       }
+
        BUG_ON(pipe(pipe_1));
        BUG_ON(pipe(pipe_2));
 
-- 
2.7.4