From: Cyril Hrubis <chrubis@suse.cz>
To: John Stultz <jstultz@google.com>
Cc: kernel-team@android.com,
Darren Hart <darren@os.amperecomputing.com>,
ltp@lists.linux.it
Subject: Re: [LTP] [PATCH 6/6] sched_football: Add trace_marker messages if we're tracing
Date: Mon, 29 Apr 2024 11:17:23 +0200 [thread overview]
Message-ID: <Zi9lo1ubVkGJHzrF@yuki> (raw)
In-Reply-To: <20240423225821.4003538-7-jstultz@google.com>
Hi!
> Cc: kernel-team@android.com
> Cc: Darren Hart <darren@os.amperecomputing.com>
> Signed-off-by: John Stultz <jstultz@google.com>
> ---
> .../realtime/func/sched_football/sched_football.c | 12 +++++++++++-
> 1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/testcases/realtime/func/sched_football/sched_football.c b/testcases/realtime/func/sched_football/sched_football.c
> index 45fbf6766..ca44584b0 100644
> --- a/testcases/realtime/func/sched_football/sched_football.c
> +++ b/testcases/realtime/func/sched_football/sched_football.c
> @@ -67,6 +67,7 @@
> #include <pthread.h>
> #include <sched.h>
> #include <errno.h>
> +#include <fcntl.h>
> #include <sys/syscall.h>
> #include <unistd.h>
> #include <sys/prctl.h>
> @@ -167,10 +168,14 @@ void *thread_offense(void *arg)
> return NULL;
> }
>
> +#define BUF_LEN 256
> int referee(int game_length)
> {
> struct timeval start, now;
> + char buf[BUF_LEN];
> int final_ball;
> + int fd = open("/sys/kernel/tracing/trace_marker", O_RDWR, 0);
> + int ret;
>
> prctl(PR_SET_NAME, "referee", 0, 0, 0);
> printf("Game On (%d seconds)!\n", game_length);
> @@ -178,14 +183,19 @@ int referee(int game_length)
> gettimeofday(&start, NULL);
> now = start;
>
> + sprintf(buf, "I|%i|Game_Started!\n", getpid());
> /* Start the game! */
> atomic_set(0, &the_ball);
> -
> + if (fd > 0)
> + ret = write(fd, buf, strnlen(buf, BUF_LEN));
> /* Watch the game */
> while ((now.tv_sec - start.tv_sec) < game_length) {
> sleep(1);
> gettimeofday(&now, NULL);
> }
> + sprintf(buf, "I|%i|Game_Over!\n", getpid());
> + if (fd > 0)
> + ret = write(fd, buf, strnlen(buf, BUF_LEN));
I know that we havre only two usages now, but it would be a bit cleaner
and readable to have a function to print the messages, e.g.
static void tracer_write(const char *msg);
And we would do:
tracer_write("Game_Started!");
It would be a good idea to add the test name to the message as well,
maybe as:
sprintf(buf, "sched_football|%i|%s\n", getpid(), msg);
> final_ball = atomic_get(&the_ball);
> /* Blow the whistle */
> printf("Game Over!\n");
> --
> 2.44.0.769.g3c40516874-goog
>
>
> --
> Mailing list info: https://lists.linux.it/listinfo/ltp
--
Cyril Hrubis
chrubis@suse.cz
--
Mailing list info: https://lists.linux.it/listinfo/ltp
next prev parent reply other threads:[~2024-04-29 9:18 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-23 22:57 [LTP] [PATCH 0/6] sched_football: Re-add crazy fans and other cleanups John Stultz via ltp
2024-04-23 22:57 ` [LTP] [PATCH 1/6] sched_football: Drop use of sched_yeild() John Stultz via ltp
2024-04-23 22:57 ` [LTP] [PATCH 2/6] sched_football: Use atomic for ball John Stultz via ltp
2024-04-29 9:06 ` Cyril Hrubis
2024-04-29 22:56 ` John Stultz via ltp
2024-05-07 9:35 ` Cyril Hrubis
2024-04-23 22:58 ` [LTP] [PATCH 3/6] sched_football: Re-add the crazy fans to interrupt everyone John Stultz via ltp
2024-04-29 9:10 ` Cyril Hrubis
2024-04-29 23:06 ` John Stultz via ltp
2024-04-23 22:58 ` [LTP] [PATCH 4/6] sched_football: Add a sleep before the game begins to get into steady state John Stultz via ltp
2024-04-23 22:58 ` [LTP] [PATCH 5/6] sched_football: Add prctrl calls to set thread comms John Stultz via ltp
2024-04-23 22:58 ` [LTP] [PATCH 6/6] sched_football: Add trace_marker messages if we're tracing John Stultz via ltp
2024-04-29 9:17 ` Cyril Hrubis [this message]
2024-04-29 23:14 ` John Stultz via ltp
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