The timerlat tracer provides an interface for any application to wait
for the timerlat's periodic wakeup. Currently, rtla timerlat uses it
to dispatch its user-space workload (-u option).
But as the tracer interface is generic, rtla timerlat can also be used
to monitor any workload that uses it. For example, a user might
place their own workload to wait on the tracer interface, and
monitor the results with rtla timerlat.
Add the -U option to rtla timerlat top and hist. With this option, rtla
timerlat will not dispatch its workload but only setting up the
system, waiting for a user to dispatch its workload.
The sample code in this patch is an example of python application
that loops in the timerlat tracer fd.
To use it, dispatch:
# rtla timerlat -U
In a terminal, then run the python program on another terminal,
specifying the CPU to run it. For example, setting on CPU 1:
#./timerlat_load.py 1
Then rtla timerlat will start printing the statistics of the
./timerlat_load.py app.
An interesting point is that the "Ret user Timer Latency" value
is the overall response time of the load. The sample load does
a memory copy to exemplify that.
The stop tracing options on rtla timerlat works in this setup
as well, including auto analysis.
Signed-off-by: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>
---
.../tools/rtla/common_timerlat_options.rst | 6 ++
tools/tracing/rtla/sample/timerlat_load.py | 74 +++++++++++++++++++
tools/tracing/rtla/src/timerlat_hist.c | 16 ++--
tools/tracing/rtla/src/timerlat_top.c | 14 +++-
4 files changed, 101 insertions(+), 9 deletions(-)
create mode 100644 tools/tracing/rtla/sample/timerlat_load.py
diff --git a/Documentation/tools/rtla/common_timerlat_options.rst b/Documentation/tools/rtla/common_timerlat_options.rst
index 88506b397c2d..d3255ed70195 100644
--- a/Documentation/tools/rtla/common_timerlat_options.rst
+++ b/Documentation/tools/rtla/common_timerlat_options.rst
@@ -33,3 +33,9 @@
to wait on the timerlat_fd. Once the workload is awakes, it goes to sleep again
adding so the measurement for the kernel-to-user and user-to-kernel to the tracer
output.
+
+**-U**, **--user-load**
+
+ Set timerlat to run without workload, waiting for the user to dispatch a per-cpu
+ task that waits for a new period on the tracing/osnoise/per_cpu/cpu$ID/timerlat_fd.
+ See linux/tools/rtla/sample/timerlat_load.py for an example of user-load code.
diff --git a/tools/tracing/rtla/sample/timerlat_load.py b/tools/tracing/rtla/sample/timerlat_load.py
new file mode 100644
index 000000000000..8cc5eb2d2e69
--- /dev/null
+++ b/tools/tracing/rtla/sample/timerlat_load.py
@@ -0,0 +1,74 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Copyright (C) 2024 Red Hat, Inc. Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>
+#
+# This is a sample code about how to use timerlat's timer by any workload
+# so rtla can measure and provide auto-analysis for the overall latency (IOW
+# the response time) for a task.
+#
+# Before running it, you need to dispatch timerlat with -U option in a terminal.
+# Then # run this script pinned to a CPU on another terminal. For example:
+#
+# timerlat_load.py 1 -p 95
+#
+# The "Timerlat IRQ" is the IRQ latency, The thread latency is the latency
+# for the python process to get the CPU. The Ret from user Timer Latency is
+# the overall latency. In other words, it is the response time for that
+# activation.
+#
+# This is just an example, the load is reading 20MB of data from /dev/full
+# It is in python because it is easy to read :-)
+
+import argparse
+import sys
+import os
+
+parser = argparse.ArgumentParser(description='user-space timerlat thread in Python')
+parser.add_argument("cpu", help='CPU to run timerlat thread')
+parser.add_argument("-p", "--prio", help='FIFO priority')
+
+args = parser.parse_args()
+
+try:
+ affinity_mask = { int(args.cpu) }
+except:
+ print("Invalid cpu: " + args.cpu)
+ exit(1)
+
+try:
+ os.sched_setaffinity(0, affinity_mask);
+except:
+ print("Error setting affinity")
+ exit(1)
+
+if (args.prio):
+ try:
+ param = os.sched_param(int(args.prio))
+ os.sched_setscheduler(0, os.SCHED_FIFO, param)
+ except:
+ print("Error setting priority")
+ exit(1)
+
+try:
+ timerlat_path = "/sys/kernel/tracing/osnoise/per_cpu/cpu" + args.cpu + "/timerlat_fd"
+ timerlat_fd = open(timerlat_path, 'r')
+except:
+ print("Error opening timerlat fd, did you run timerlat -U?")
+ exit(1)
+
+try:
+ data_fd = open("/dev/full", 'r');
+except:
+ print("Error opening data fd")
+
+while True:
+ try:
+ timerlat_fd.read(1)
+ data_fd.read(20*1024*1024)
+ except:
+ print("Leaving")
+ break
+
+timerlat_fd.close()
+data_fd.close()
diff --git a/tools/tracing/rtla/src/timerlat_hist.c b/tools/tracing/rtla/src/timerlat_hist.c
index 3a5b8c409e7d..a668bf52e78e 100644
--- a/tools/tracing/rtla/src/timerlat_hist.c
+++ b/tools/tracing/rtla/src/timerlat_hist.c
@@ -39,6 +39,7 @@ struct timerlat_hist_params {
int hk_cpus;
int no_aa;
int dump_tasks;
+ int user_workload;
int user_hist;
cpu_set_t hk_cpu_set;
struct sched_attr sched_param;
@@ -534,6 +535,7 @@ static void timerlat_hist_usage(char *usage)
" d:runtime[us|ms|s]:period[us|ms|s] - use SCHED_DEADLINE with runtime and period",
" in nanoseconds",
" -u/--user-threads: use rtla user-space threads instead of in-kernel timerlat threads",
+ " -U/--user-load: enable timerlat for user-defined user-space workload",
NULL,
};
@@ -591,6 +593,7 @@ static struct timerlat_hist_params
{"thread", required_argument, 0, 'T'},
{"trace", optional_argument, 0, 't'},
{"user-threads", no_argument, 0, 'u'},
+ {"user-load", no_argument, 0, 'U'},
{"event", required_argument, 0, 'e'},
{"no-irq", no_argument, 0, '0'},
{"no-thread", no_argument, 0, '1'},
@@ -609,7 +612,7 @@ static struct timerlat_hist_params
/* getopt_long stores the option index here. */
int option_index = 0;
- c = getopt_long(argc, argv, "a:c:C::b:d:e:E:DhH:i:np:P:s:t::T:u0123456:7:8:9\1",
+ c = getopt_long(argc, argv, "a:c:C::b:d:e:E:DhH:i:np:P:s:t::T:uU0123456:7:8:9\1",
long_options, &option_index);
/* detect the end of the options. */
@@ -720,6 +723,9 @@ static struct timerlat_hist_params
params->trace_output = "timerlat_trace.txt";
break;
case 'u':
+ params->user_workload = 1;
+ /* fallback: -u implies in -U */
+ case 'U':
params->user_hist = 1;
break;
case '0': /* no irq */
@@ -981,7 +987,7 @@ int timerlat_hist_main(int argc, char *argv[])
}
}
- if (params->cgroup && !params->user_hist) {
+ if (params->cgroup && !params->user_workload) {
retval = set_comm_cgroup("timerlat/", params->cgroup_name);
if (!retval) {
err_msg("Failed to move threads to cgroup\n");
@@ -1045,7 +1051,7 @@ int timerlat_hist_main(int argc, char *argv[])
tool->start_time = time(NULL);
timerlat_hist_set_signals(params);
- if (params->user_hist) {
+ if (params->user_workload) {
/* rtla asked to stop */
params_u.should_run = 1;
/* all threads left */
@@ -1082,14 +1088,14 @@ int timerlat_hist_main(int argc, char *argv[])
break;
/* is there still any user-threads ? */
- if (params->user_hist) {
+ if (params->user_workload) {
if (params_u.stopped_running) {
debug_msg("timerlat user-space threads stopped!\n");
break;
}
}
}
- if (params->user_hist && !params_u.stopped_running) {
+ if (params->user_workload && !params_u.stopped_running) {
params_u.should_run = 0;
sleep(1);
}
diff --git a/tools/tracing/rtla/src/timerlat_top.c b/tools/tracing/rtla/src/timerlat_top.c
index 1640f121baca..6af47f21a1a3 100644
--- a/tools/tracing/rtla/src/timerlat_top.c
+++ b/tools/tracing/rtla/src/timerlat_top.c
@@ -43,6 +43,7 @@ struct timerlat_top_params {
int cgroup;
int hk_cpus;
int user_top;
+ int user_workload;
cpu_set_t hk_cpu_set;
struct sched_attr sched_param;
struct trace_events *events;
@@ -364,6 +365,7 @@ static void timerlat_top_usage(char *usage)
" d:runtime[us|ms|s]:period[us|ms|s] - use SCHED_DEADLINE with runtime and period",
" in nanoseconds",
" -u/--user-threads: use rtla user-space threads instead of in-kernel timerlat threads",
+ " -U/--user-load: enable timerlat for user-defined user-space workload",
NULL,
};
@@ -419,6 +421,7 @@ static struct timerlat_top_params
{"thread", required_argument, 0, 'T'},
{"trace", optional_argument, 0, 't'},
{"user-threads", no_argument, 0, 'u'},
+ {"user-load", no_argument, 0, 'U'},
{"trigger", required_argument, 0, '0'},
{"filter", required_argument, 0, '1'},
{"dma-latency", required_argument, 0, '2'},
@@ -431,7 +434,7 @@ static struct timerlat_top_params
/* getopt_long stores the option index here. */
int option_index = 0;
- c = getopt_long(argc, argv, "a:c:C::d:De:hH:i:np:P:qs:t::T:u0:1:2:345:",
+ c = getopt_long(argc, argv, "a:c:C::d:De:hH:i:np:P:qs:t::T:uU0:1:2:345:",
long_options, &option_index);
/* detect the end of the options. */
@@ -548,6 +551,9 @@ static struct timerlat_top_params
break;
case 'u':
+ params->user_workload = true;
+ /* fallback: -u implies -U */
+ case 'U':
params->user_top = true;
break;
case '0': /* trigger */
@@ -865,7 +871,7 @@ int timerlat_top_main(int argc, char *argv[])
top->start_time = time(NULL);
timerlat_top_set_signals(params);
- if (params->user_top) {
+ if (params->user_workload) {
/* rtla asked to stop */
params_u.should_run = 1;
/* all threads left */
@@ -908,7 +914,7 @@ int timerlat_top_main(int argc, char *argv[])
break;
/* is there still any user-threads ? */
- if (params->user_top) {
+ if (params->user_workload) {
if (params_u.stopped_running) {
debug_msg("timerlat user space threads stopped!\n");
break;
@@ -916,7 +922,7 @@ int timerlat_top_main(int argc, char *argv[])
}
}
- if (params->user_top && !params_u.stopped_running) {
+ if (params->user_workload && !params_u.stopped_running) {
params_u.should_run = 0;
sleep(1);
}
--
2.43.0
