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