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Add a usleep option to pip_stress

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Add a usleep option to pip_stress
Resolves: RHEL-77110

Signed-off-by: John Kacur <jkacur@redhat.com>
This commit is contained in:
John Kacur 2025-01-30 15:03:18 -05:00
parent 2c7b6520ed
commit 3d56e160fe
2 changed files with 87 additions and 1 deletions
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81
pip_stress-Add-option-usleep.patch Normal file
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@ -0,0 +1,81 @@
From eea8da1647c3f7d26f3aae607475266112ab79b1 Mon Sep 17 00:00:00 2001
From: Shizhao Chen <shichen@redhat.com>
Date: Fri, 24 Jan 2025 15:51:57 +0800
Subject: [PATCH 4/5] rt-tests: pip_stress: Add option --usleep
Different hardwares have different threasholds for usleep_val to
reliably trigger an prio inversion, add option --usleep to allow
specifying it at runtime, to facilitate testing of prio inheritance
on different platforms.
Signed-off-by: Shizhao Chen <shichen@redhat.com>
Signed-off-by: John Kacur <jkacur@redhat.com>
---
src/pi_tests/pip_stress.8 | 6 +++++-
src/pi_tests/pip_stress.c | 10 ++++++++--
2 files changed, 13 insertions(+), 3 deletions(-)
diff --git a/src/pi_tests/pip_stress.8 b/src/pi_tests/pip_stress.8
index 0d06dd2215f8..0f65ad1c107b 100644
--- a/src/pi_tests/pip_stress.8
+++ b/src/pi_tests/pip_stress.8
@@ -5,7 +5,8 @@
.B pip_stress \- Priority Inheritance with processes
.SH SYNOPSIS
.B pip_stress
-
+.RB [ \-u|\-\-usleep
+.IR TIME ]
.SH DESCRIPTION
This program demonstrates the technique of using priority inheritance (PI)
mutexes with processes instead of threads.
@@ -41,6 +42,9 @@ merely increase the time that the low priority process sleeps while
holding the lock. (usleep);
Also note that you have to run as a user with permission to change
scheduling priorities.
+.SH OPTIONS
+.IP "\-u TIME,\-\-usleep=TIME"
+Specify the sleep time in usec of the low priority process. Defaults to 500.
.BR
.SH AUTHOR
pip_stress was written by John Kacur <jkacur at redhat.com>
diff --git a/src/pi_tests/pip_stress.c b/src/pi_tests/pip_stress.c
index fb0391bfec0d..9bd225fb155c 100644
--- a/src/pi_tests/pip_stress.c
+++ b/src/pi_tests/pip_stress.c
@@ -72,7 +72,9 @@ static void usage(int error)
printf("pip_stress V %1.2f\n", VERSION);
printf("Usage:\n"
"pip_stress <options>\n"\
- "-h --help Show this help menu.\n"
+ "-h --help Show this help menu.\n"\
+ "-u TIME --usleep=TIME Specify the sleep time in usec of the low priority process.\n"\
+ " Defaults to 500.\n"
);
exit(error);
}
@@ -88,16 +90,20 @@ int main(int argc, char *argv[])
for (;;) {
struct option long_options[] = {
{ "help", no_argument, NULL, 'h' },
+ { "usleep", required_argument, NULL, 'u' },
{ NULL, 0, NULL, 0 },
};
- int c = getopt_long(argc, argv, "s:h", long_options, NULL);
+ int c = getopt_long(argc, argv, "hu:", long_options, NULL);
if (c == -1)
break;
switch (c) {
case 'h':
usage(0);
break;
+ case 'u':
+ usleep_val = strtoul(optarg, NULL, 10);
+ break;
default:
usage(1);
break;
--
2.48.1

7
realtime-tests.spec
View File

@ -6,7 +6,7 @@ Name: realtime-tests
# Numa argument to make: NUMA=1
#
Version: 2.8
Release: 3%{?dist}
Release: 4%{?dist}
License: GPLv2
URL: https://git.kernel.org/pub/scm/utils/rt-tests/rt-tests.git
Source0: https://www.kernel.org/pub/linux/utils/rt-tests/rt-tests-%{version}.tar.xz
@ -26,6 +26,7 @@ Patch2: 0002-rt-tests-Handle-lcpupower-flag-outside-LDFLAGS.patch
Patch3: Turn-off-Wunused-parameter.patch
Patch4: Enable-Werror.patch
Patch5: Remove-unused-parameter-annotations.patch
Patch6: pip_stress-Add-option-usleep.patch
%description
realtime-tests is a set of programs that test and measure various components of
@ -84,6 +85,10 @@ latency. It also tests the functioning of priority-inheritance mutexes.
%{_mandir}/man8/determine_maximum_mpps.8.*
%changelog
* Thu Jan 30 2025 John Kacur <jkacur@redhat.com> - 2.8-4
- Add a usleep option to pip_stress
Resolves: RHEL-77110
* Thu Jan 30 2025 John Kacur <jkacur@redhat.com> - 2.8-3
- Remove unused parameter warning and annotations
- Add -Werror