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author | Daniel Bristot de Oliveira <bristot@kernel.org> | 2023-06-06 19:12:23 +0300 |
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committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2023-06-13 23:38:51 +0300 |
commit | cdca4f4e5e8ea1c21417d86a0b2ed6af282cbb6e (patch) | |
tree | 1b628b3b0b70da2c195325576888cd351bdf13a1 /tools/tracing/rtla/src/utils.h | |
parent | 7bc4d3089a50050d4df0af63423a5d907c3bdb1a (diff) | |
download | linux-cdca4f4e5e8ea1c21417d86a0b2ed6af282cbb6e.tar.xz |
rtla/timerlat_top: Add timerlat user-space support
Add the support for running timerlat threads in user-space. In this
mode, enabled with -u/--user-threads, timerlat dispatches user-space
processes that will loop in the timerlat_fd, measuring the overhead
for going to user-space and then returning to the kernel - in addition
to the existing measurements.
Here is one example of the tool's output with -u enabled:
$ sudo timerlat top -u -d 600 -q
Timer Latency
0 00:10:01 | IRQ Timer Latency (us) | Thread Timer Latency (us) | Ret user Timer Latency (us)
CPU COUNT | cur min avg max | cur min avg max | cur min avg max
0 #600001 | 0 0 0 3 | 2 1 2 9 | 3 2 3 15
1 #600001 | 0 0 0 2 | 2 1 2 13 | 2 2 3 18
2 #600001 | 0 0 0 10 | 2 1 2 16 | 3 2 3 20
3 #600001 | 0 0 0 7 | 2 1 2 10 | 3 2 3 11
4 #600000 | 0 0 0 16 | 2 1 2 41 | 3 2 3 58
5 #600000 | 0 0 0 3 | 2 1 2 10 | 3 2 3 13
6 #600000 | 0 0 0 5 | 2 1 2 7 | 3 2 3 10
7 #600000 | 0 0 0 1 | 2 1 2 7 | 3 2 3 10
The tuning setup like -p or -C work for the user-space threads as well.
Link: https://lkml.kernel.org/r/758ad2292a0a1d884138d08219e1a0f572d257a2.1686066600.git.bristot@kernel.org
Cc: William White <chwhite@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Tested-by: Juri Lelli <juri.lelli@redhat.com>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'tools/tracing/rtla/src/utils.h')
-rw-r--r-- | tools/tracing/rtla/src/utils.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/tracing/rtla/src/utils.h b/tools/tracing/rtla/src/utils.h index dec59163cfbc..04ed1e650495 100644 --- a/tools/tracing/rtla/src/utils.h +++ b/tools/tracing/rtla/src/utils.h @@ -57,8 +57,10 @@ struct sched_attr { int parse_prio(char *arg, struct sched_attr *sched_param); int parse_cpu_set(char *cpu_list, cpu_set_t *set); +int __set_sched_attr(int pid, struct sched_attr *attr); int set_comm_sched_attr(const char *comm_prefix, struct sched_attr *attr); int set_comm_cgroup(const char *comm_prefix, const char *cgroup); +int set_pid_cgroup(pid_t pid, const char *cgroup); int set_cpu_dma_latency(int32_t latency); int auto_house_keeping(cpu_set_t *monitored_cpus); |