tools/selftests: add mq_perf_tests

Add the mq_perf_tests tool I used when creating my mq performance patch.
Also add a local .gitignore to keep the binaries from showing up in git
status output.

[akpm@linux-foundation.org: checkpatch fixes]
Signed-off-by: Doug Ledford <dledford@redhat.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 746 insertions, 1 deletions

diff --git a/tools/testing/selftests/mqueue/.gitignore b/tools/testing/selftests/mqueue/.gitignore
new file mode 100644
index 000000000000..d8d42377205a
--- /dev/null
+++ b/tools/testing/selftests/mqueue/.gitignore
@@ -0,0 +1,2 @@
+mq_open_tests
+mq_perf_tests
diff --git a/tools/testing/selftests/mqueue/Makefile b/tools/testing/selftests/mqueue/Makefile
index bd74142a173f..54c0aad2b47c 100644
--- a/tools/testing/selftests/mqueue/Makefile
+++ b/tools/testing/selftests/mqueue/Makefile
@@ -1,8 +1,10 @@
 all:
         gcc -O2 -lrt mq_open_tests.c -o mq_open_tests
+        gcc -O2 -lrt -lpthread -lpopt -o mq_perf_tests mq_perf_tests.c
 
 run_tests:
         ./mq_open_tests /test1
+        ./mq_perf_tests
 
 clean:
-        rm -f mq_open_tests
+        rm -f mq_open_tests mq_perf_tests
diff --git a/tools/testing/selftests/mqueue/mq_perf_tests.c b/tools/testing/selftests/mqueue/mq_perf_tests.c
new file mode 100644
index 000000000000..2fadd4b97045
--- /dev/null
+++ b/tools/testing/selftests/mqueue/mq_perf_tests.c
@@ -0,0 +1,741 @@
+/*
+ * This application is Copyright 2012 Red Hat, Inc.
+ *      Doug Ledford <dledford@redhat.com>
+ *
+ * mq_perf_tests is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3.
+ *
+ * mq_perf_tests is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * For the full text of the license, see <http://www.gnu.org/licenses/>.
+ *
+ * mq_perf_tests.c
+ *   Tests various types of message queue workloads, concentrating on those
+ *   situations that invole large message sizes, large message queue depths,
+ *   or both, and reports back useful metrics about kernel message queue
+ *   performance.
+ *
+ */
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <limits.h>
+#include <errno.h>
+#include <signal.h>
+#include <pthread.h>
+#include <sched.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/stat.h>
+#include <mqueue.h>
+#include <popt.h>
+
+static char *usage =
+"Usage:\n"
+"  %s [-c #[,#..] -f] path\n"
+"\n"
+"       -c #    Skip most tests and go straight to a high queue depth test\n"
+"               and then run that test continuously (useful for running at\n"
+"               the same time as some other workload to see how much the\n"
+"               cache thrashing caused by adding messages to a very deep\n"
+"               queue impacts the performance of other programs).  The number\n"
+"               indicates which CPU core we should bind the process to during\n"
+"               the run.  If you have more than one physical CPU, then you\n"
+"               will need one copy per physical CPU package, and you should\n"
+"               specify the CPU cores to pin ourself to via a comma separated\n"
+"               list of CPU values.\n"
+"       -f      Only usable with continuous mode.  Pin ourself to the CPUs\n"
+"               as requested, then instead of looping doing a high mq\n"
+"               workload, just busy loop.  This will allow us to lock up a\n"
+"               single CPU just like we normally would, but without actually\n"
+"               thrashing the CPU cache.  This is to make it easier to get\n"
+"               comparable numbers from some other workload running on the\n"
+"               other CPUs.  One set of numbers with # CPUs locked up running\n"
+"               an mq workload, and another set of numbers with those same\n"
+"               CPUs locked away from the test workload, but not doing\n"
+"               anything to trash the cache like the mq workload might.\n"
+"       path    Path name of the message queue to create\n"
+"\n"
+"       Note: this program must be run as root in order to enable all tests\n"
+"\n";
+
+char *MAX_MSGS = "/proc/sys/fs/mqueue/msg_max";
+char *MAX_MSGSIZE = "/proc/sys/fs/mqueue/msgsize_max";
+
+#define min(a, b) ((a) < (b) ? (a) : (b))
+#define MAX_CPUS 64
+char *cpu_option_string;
+int cpus_to_pin[MAX_CPUS];
+int num_cpus_to_pin;
+pthread_t cpu_threads[MAX_CPUS];
+pthread_t main_thread;
+cpu_set_t *cpu_set;
+int cpu_set_size;
+int cpus_online;
+
+#define MSG_SIZE 16
+#define TEST1_LOOPS 10000000
+#define TEST2_LOOPS 100000
+int continuous_mode;
+int continuous_mode_fake;
+
+struct rlimit saved_limits, cur_limits;
+int saved_max_msgs, saved_max_msgsize;
+int cur_max_msgs, cur_max_msgsize;
+FILE *max_msgs, *max_msgsize;
+int cur_nice;
+char *queue_path = "/mq_perf_tests";
+mqd_t queue = -1;
+struct mq_attr result;
+int mq_prio_max;
+
+const struct poptOption options[] = {
+        {
+                .longName = "continuous",
+                .shortName = 'c',
+                .argInfo = POPT_ARG_STRING,
+                .arg = &cpu_option_string,
+                .val = 'c',
+                .descrip = "Run continuous tests at a high queue depth in "
+                        "order to test the effects of cache thrashing on "
+                        "other tasks on the system.  This test is intended "
+                        "to be run on one core of each physical CPU while "
+                        "some other CPU intensive task is run on all the other "
+                        "cores of that same physical CPU and the other task "
+                        "is timed.  It is assumed that the process of adding "
+                        "messages to the message queue in a tight loop will "
+                        "impact that other task to some degree.  Once the "
+                        "tests are performed in this way, you should then "
+                        "re-run the tests using fake mode in order to check "
+                        "the difference in time required to perform the CPU "
+                        "intensive task",
+                .argDescrip = "cpu[,cpu]",
+        },
+        {
+                .longName = "fake",
+                .shortName = 'f',
+                .argInfo = POPT_ARG_NONE,
+                .arg = &continuous_mode_fake,
+                .val = 0,
+                .descrip = "Tie up the CPUs that we would normally tie up in"
+                        "continuous mode, but don't actually do any mq stuff, "
+                        "just keep the CPU busy so it can't be used to process "
+                        "system level tasks as this would free up resources on "
+                        "the other CPU cores and skew the comparison between "
+                        "the no-mqueue work and mqueue work tests",
+                .argDescrip = NULL,
+        },
+        {
+                .longName = "path",
+                .shortName = 'p',
+                .argInfo = POPT_ARG_STRING | POPT_ARGFLAG_SHOW_DEFAULT,
+                .arg = &queue_path,
+                .val = 'p',
+                .descrip = "The name of the path to use in the mqueue "
+                        "filesystem for our tests",
+                .argDescrip = "pathname",
+        },
+        POPT_AUTOHELP
+        POPT_TABLEEND
+};
+
+static inline void __set(FILE *stream, int value, char *err_msg);
+void shutdown(int exit_val, char *err_cause, int line_no);
+void sig_action_SIGUSR1(int signum, siginfo_t *info, void *context);
+void sig_action(int signum, siginfo_t *info, void *context);
+static inline int get(FILE *stream);
+static inline void set(FILE *stream, int value);
+static inline int try_set(FILE *stream, int value);
+static inline void getr(int type, struct rlimit *rlim);
+static inline void setr(int type, struct rlimit *rlim);
+static inline void open_queue(struct mq_attr *attr);
+void increase_limits(void);
+
+static inline void __set(FILE *stream, int value, char *err_msg)
+{
+        rewind(stream);
+        if (fprintf(stream, "%d", value) < 0)
+                perror(err_msg);
+}
+
+
+void shutdown(int exit_val, char *err_cause, int line_no)
+{
+        static int in_shutdown = 0;
+        int errno_at_shutdown = errno;
+        int i;
+
+        /* In case we get called by multiple threads or from an sighandler */
+        if (in_shutdown++)
+                return;
+
+        for (i = 0; i < num_cpus_to_pin; i++)
+                if (cpu_threads[i]) {
+                        pthread_kill(cpu_threads[i], SIGUSR1);
+                        pthread_join(cpu_threads[i], NULL);
+                }
+
+        if (queue != -1)
+                if (mq_close(queue))
+                        perror("mq_close() during shutdown");
+        if (queue_path)
+                /*
+                 * Be silent if this fails, if we cleaned up already it's
+                 * expected to fail
+                 */
+                mq_unlink(queue_path);
+        if (saved_max_msgs)
+                __set(max_msgs, saved_max_msgs,
+                      "failed to restore saved_max_msgs");
+        if (saved_max_msgsize)
+                __set(max_msgsize, saved_max_msgsize,
+                      "failed to restore saved_max_msgsize");
+        if (exit_val)
+                error(exit_val, errno_at_shutdown, "%s at %d",
+                      err_cause, line_no);
+        exit(0);
+}
+
+void sig_action_SIGUSR1(int signum, siginfo_t *info, void *context)
+{
+        if (pthread_self() != main_thread)
+                pthread_exit(0);
+        else {
+                fprintf(stderr, "Caught signal %d in SIGUSR1 handler, "
+                                "exiting\n", signum);
+                shutdown(0, "", 0);
+                fprintf(stderr, "\n\nReturned from shutdown?!?!\n\n");
+                exit(0);
+        }
+}
+
+void sig_action(int signum, siginfo_t *info, void *context)
+{
+        if (pthread_self() != main_thread)
+                pthread_kill(main_thread, signum);
+        else {
+                fprintf(stderr, "Caught signal %d, exiting\n", signum);
+                shutdown(0, "", 0);
+                fprintf(stderr, "\n\nReturned from shutdown?!?!\n\n");
+                exit(0);
+        }
+}
+
+static inline int get(FILE *stream)
+{
+        int value;
+        rewind(stream);
+        if (fscanf(stream, "%d", &value) != 1)
+                shutdown(4, "Error reading /proc entry", __LINE__);
+        return value;
+}
+
+static inline void set(FILE *stream, int value)
+{
+        int new_value;
+
+        rewind(stream);
+        if (fprintf(stream, "%d", value) < 0)
+                return shutdown(5, "Failed writing to /proc file", __LINE__);
+        new_value = get(stream);
+        if (new_value != value)
+                return shutdown(5, "We didn't get what we wrote to /proc back",
+                                __LINE__);
+}
+
+static inline int try_set(FILE *stream, int value)
+{
+        int new_value;
+
+        rewind(stream);
+        fprintf(stream, "%d", value);
+        new_value = get(stream);
+        return new_value == value;
+}
+
+static inline void getr(int type, struct rlimit *rlim)
+{
+        if (getrlimit(type, rlim))
+                shutdown(6, "getrlimit()", __LINE__);
+}
+
+static inline void setr(int type, struct rlimit *rlim)
+{
+        if (setrlimit(type, rlim))
+                shutdown(7, "setrlimit()", __LINE__);
+}
+
+/**
+ * open_queue - open the global queue for testing
+ * @attr - An attr struct specifying the desired queue traits
+ * @result - An attr struct that lists the actual traits the queue has
+ *
+ * This open is not allowed to fail, failure will result in an orderly
+ * shutdown of the program.  The global queue_path is used to set what
+ * queue to open, the queue descriptor is saved in the global queue
+ * variable.
+ */
+static inline void open_queue(struct mq_attr *attr)
+{
+        int flags = O_RDWR | O_EXCL | O_CREAT | O_NONBLOCK;
+        int perms = DEFFILEMODE;
+
+        queue = mq_open(queue_path, flags, perms, attr);
+        if (queue == -1)
+                shutdown(1, "mq_open()", __LINE__);
+        if (mq_getattr(queue, &result))
+                shutdown(1, "mq_getattr()", __LINE__);
+        printf("\n\tQueue %s created:\n", queue_path);
+        printf("\t\tmq_flags:\t\t\t%s\n", result.mq_flags & O_NONBLOCK ?
+               "O_NONBLOCK" : "(null)");
+        printf("\t\tmq_maxmsg:\t\t\t%d\n", result.mq_maxmsg);
+        printf("\t\tmq_msgsize:\t\t\t%d\n", result.mq_msgsize);
+        printf("\t\tmq_curmsgs:\t\t\t%d\n", result.mq_curmsgs);
+}
+
+void *fake_cont_thread(void *arg)
+{
+        int i;
+
+        for (i = 0; i < num_cpus_to_pin; i++)
+                if (cpu_threads[i] == pthread_self())
+                        break;
+        printf("\tStarted fake continuous mode thread %d on CPU %d\n", i,
+               cpus_to_pin[i]);
+        while (1)
+                ;
+}
+
+void *cont_thread(void *arg)
+{
+        char buff[MSG_SIZE];
+        int i, priority;
+
+        for (i = 0; i < num_cpus_to_pin; i++)
+                if (cpu_threads[i] == pthread_self())
+                        break;
+        printf("\tStarted continuous mode thread %d on CPU %d\n", i,
+               cpus_to_pin[i]);
+        while (1) {
+                while (mq_send(queue, buff, sizeof(buff), 0) == 0)
+                        ;
+                mq_receive(queue, buff, sizeof(buff), &priority);
+        }
+}
+
+#define drain_queue() \
+        while (mq_receive(queue, buff, MSG_SIZE, &prio_in) == MSG_SIZE)
+
+#define do_untimed_send() \
+        do { \
+                if (mq_send(queue, buff, MSG_SIZE, prio_out)) \
+                        shutdown(3, "Test send failure", __LINE__); \
+        } while (0)
+
+#define do_send_recv() \
+        do { \
+                clock_gettime(clock, &start); \
+                if (mq_send(queue, buff, MSG_SIZE, prio_out)) \
+                        shutdown(3, "Test send failure", __LINE__); \
+                clock_gettime(clock, &middle); \
+                if (mq_receive(queue, buff, MSG_SIZE, &prio_in) != MSG_SIZE) \
+                        shutdown(3, "Test receive failure", __LINE__); \
+                clock_gettime(clock, &end); \
+                nsec = ((middle.tv_sec - start.tv_sec) * 1000000000) + \
+                        (middle.tv_nsec - start.tv_nsec); \
+                send_total.tv_nsec += nsec; \
+                if (send_total.tv_nsec >= 1000000000) { \
+                        send_total.tv_sec++; \
+                        send_total.tv_nsec -= 1000000000; \
+                } \
+                nsec = ((end.tv_sec - middle.tv_sec) * 1000000000) + \
+                        (end.tv_nsec - middle.tv_nsec); \
+                recv_total.tv_nsec += nsec; \
+                if (recv_total.tv_nsec >= 1000000000) { \
+                        recv_total.tv_sec++; \
+                        recv_total.tv_nsec -= 1000000000; \
+                } \
+        } while (0)
+
+struct test {
+        char *desc;
+        void (*func)(int *);
+};
+
+void const_prio(int *prio)
+{
+        return;
+}
+
+void inc_prio(int *prio)
+{
+        if (++*prio == mq_prio_max)
+                *prio = 0;
+}
+
+void dec_prio(int *prio)
+{
+        if (--*prio < 0)
+                *prio = mq_prio_max - 1;
+}
+
+void random_prio(int *prio)
+{
+        *prio = random() % mq_prio_max;
+}
+
+struct test test2[] = {
+        {"\n\tTest #2a: Time send/recv message, queue full, constant prio\n",
+                const_prio},
+        {"\n\tTest #2b: Time send/recv message, queue full, increasing prio\n",
+                inc_prio},
+        {"\n\tTest #2c: Time send/recv message, queue full, decreasing prio\n",
+                dec_prio},
+        {"\n\tTest #2d: Time send/recv message, queue full, random prio\n",
+                random_prio},
+        {NULL, NULL}
+};
+
+/**
+ * Tests to perform (all done with MSG_SIZE messages):
+ *
+ * 1) Time to add/remove message with 0 messages on queue
+ * 1a) with constant prio
+ * 2) Time to add/remove message when queue close to capacity:
+ * 2a) with constant prio
+ * 2b) with increasing prio
+ * 2c) with decreasing prio
+ * 2d) with random prio
+ * 3) Test limits of priorities honored (double check _SC_MQ_PRIO_MAX)
+ */
+void *perf_test_thread(void *arg)
+{
+        char buff[MSG_SIZE];
+        int prio_out, prio_in;
+        int i;
+        clockid_t clock;
+        pthread_t *t;
+        struct timespec res, start, middle, end, send_total, recv_total;
+        unsigned long long nsec;
+        struct test *cur_test;
+
+        t = &cpu_threads[0];
+        printf("\n\tStarted mqueue performance test thread on CPU %d\n",
+               cpus_to_pin[0]);
+        mq_prio_max = sysconf(_SC_MQ_PRIO_MAX);
+        if (mq_prio_max == -1)
+                shutdown(2, "sysconf(_SC_MQ_PRIO_MAX)", __LINE__);
+        if (pthread_getcpuclockid(cpu_threads[0], &clock) != 0)
+                shutdown(2, "pthread_getcpuclockid", __LINE__);
+
+        if (clock_getres(clock, &res))
+                shutdown(2, "clock_getres()", __LINE__);
+
+        printf("\t\tMax priorities:\t\t\t%d\n", mq_prio_max);
+        printf("\t\tClock resolution:\t\t%d nsec%s\n", res.tv_nsec,
+               res.tv_nsec > 1 ? "s" : "");
+
+
+
+        printf("\n\tTest #1: Time send/recv message, queue empty\n");
+        printf("\t\t(%d iterations)\n", TEST1_LOOPS);
+        prio_out = 0;
+        send_total.tv_sec = 0;
+        send_total.tv_nsec = 0;
+        recv_total.tv_sec = 0;
+        recv_total.tv_nsec = 0;
+        for (i = 0; i < TEST1_LOOPS; i++)
+                do_send_recv();
+        printf("\t\tSend msg:\t\t\t%d.%ds total time\n",
+               send_total.tv_sec, send_total.tv_nsec);
+        nsec = ((unsigned long long)send_total.tv_sec * 1000000000 +
+                 send_total.tv_nsec) / TEST1_LOOPS;
+        printf("\t\t\t\t\t\t%d nsec/msg\n", nsec);
+        printf("\t\tRecv msg:\t\t\t%d.%ds total time\n",
+               recv_total.tv_sec, recv_total.tv_nsec);
+        nsec = ((unsigned long long)recv_total.tv_sec * 1000000000 +
+                recv_total.tv_nsec) / TEST1_LOOPS;
+        printf("\t\t\t\t\t\t%d nsec/msg\n", nsec);
+
+
+        for (cur_test = test2; cur_test->desc != NULL; cur_test++) {
+                printf(cur_test->desc);
+                printf("\t\t(%d iterations)\n", TEST2_LOOPS);
+                prio_out = 0;
+                send_total.tv_sec = 0;
+                send_total.tv_nsec = 0;
+                recv_total.tv_sec = 0;
+                recv_total.tv_nsec = 0;
+                printf("\t\tFilling queue...");
+                fflush(stdout);
+                clock_gettime(clock, &start);
+                for (i = 0; i < result.mq_maxmsg - 1; i++) {
+                        do_untimed_send();
+                        cur_test->func(&prio_out);
+                }
+                clock_gettime(clock, &end);
+                nsec = ((unsigned long long)(end.tv_sec - start.tv_sec) *
+                        1000000000) + (end.tv_nsec - start.tv_nsec);
+                printf("done.\t\t%lld.%llds\n", nsec / 1000000000,
+                       nsec % 1000000000);
+                printf("\t\tTesting...");
+                fflush(stdout);
+                for (i = 0; i < TEST2_LOOPS; i++) {
+                        do_send_recv();
+                        cur_test->func(&prio_out);
+                }
+                printf("done.\n");
+                printf("\t\tSend msg:\t\t\t%d.%ds total time\n",
+                       send_total.tv_sec, send_total.tv_nsec);
+                nsec = ((unsigned long long)send_total.tv_sec * 1000000000 +
+                         send_total.tv_nsec) / TEST2_LOOPS;
+                printf("\t\t\t\t\t\t%d nsec/msg\n", nsec);
+                printf("\t\tRecv msg:\t\t\t%d.%ds total time\n",
+                       recv_total.tv_sec, recv_total.tv_nsec);
+                nsec = ((unsigned long long)recv_total.tv_sec * 1000000000 +
+                        recv_total.tv_nsec) / TEST2_LOOPS;
+                printf("\t\t\t\t\t\t%d nsec/msg\n", nsec);
+                printf("\t\tDraining queue...");
+                fflush(stdout);
+                clock_gettime(clock, &start);
+                drain_queue();
+                clock_gettime(clock, &end);
+                nsec = ((unsigned long long)(end.tv_sec - start.tv_sec) *
+                        1000000000) + (end.tv_nsec - start.tv_nsec);
+                printf("done.\t\t%lld.%llds\n", nsec / 1000000000,
+                       nsec % 1000000000);
+        }
+        return 0;
+}
+
+void increase_limits(void)
+{
+        cur_limits.rlim_cur = RLIM_INFINITY;
+        cur_limits.rlim_max = RLIM_INFINITY;
+        setr(RLIMIT_MSGQUEUE, &cur_limits);
+        while (try_set(max_msgs, cur_max_msgs += 10))
+                ;
+        cur_max_msgs = get(max_msgs);
+        while (try_set(max_msgsize, cur_max_msgsize += 1024))
+                ;
+        cur_max_msgsize = get(max_msgsize);
+        if (setpriority(PRIO_PROCESS, 0, -20) != 0)
+                shutdown(2, "setpriority()", __LINE__);
+        cur_nice = -20;
+}
+
+int main(int argc, char *argv[])
+{
+        struct mq_attr attr;
+        char *option, *next_option;
+        int i, cpu;
+        struct sigaction sa;
+        poptContext popt_context;
+        char rc;
+        void *retval;
+
+        main_thread = pthread_self();
+        num_cpus_to_pin = 0;
+
+        if (sysconf(_SC_NPROCESSORS_ONLN) == -1) {
+                perror("sysconf(_SC_NPROCESSORS_ONLN)");
+                exit(1);
+        }
+        cpus_online = min(MAX_CPUS, sysconf(_SC_NPROCESSORS_ONLN));
+        cpu_set = CPU_ALLOC(cpus_online);
+        if (cpu_set == NULL) {
+                perror("CPU_ALLOC()");
+                exit(1);
+        }
+        cpu_set_size = CPU_ALLOC_SIZE(cpus_online);
+        CPU_ZERO_S(cpu_set_size, cpu_set);
+
+        popt_context = poptGetContext(NULL, argc, (const char **)argv,
+                                      options, 0);
+
+        while ((rc = poptGetNextOpt(popt_context)) > 0) {
+                switch (rc) {
+                case 'c':
+                        continuous_mode = 1;
+                        option = cpu_option_string;
+                        do {
+                                next_option = strchr(option, ',');
+                                if (next_option)
+                                        *next_option = '\0';
+                                cpu = atoi(option);
+                                if (cpu >= cpus_online)
+                                        fprintf(stderr, "CPU %d exceeds "
+                                                "cpus online, ignoring.\n",
+                                                cpu);
+                                else
+                                        cpus_to_pin[num_cpus_to_pin++] = cpu;
+                                if (next_option)
+                                        option = ++next_option;
+                        } while (next_option && num_cpus_to_pin < MAX_CPUS);
+                        /* Double check that they didn't give us the same CPU
+                         * more than once */
+                        for (cpu = 0; cpu < num_cpus_to_pin; cpu++) {
+                                if (CPU_ISSET_S(cpus_to_pin[cpu], cpu_set_size,
+                                                cpu_set)) {
+                                        fprintf(stderr, "Any given CPU may "
+                                                "only be given once.\n");
+                                        exit(1);
+                                } else
+                                        CPU_SET_S(cpus_to_pin[cpu],
+                                                  cpu_set_size, cpu_set);
+                        }
+                        break;
+                case 'p':
+                        /*
+                         * Although we can create a msg queue with a
+                         * non-absolute path name, unlink will fail.  So,
+                         * if the name doesn't start with a /, add one
+                         * when we save it.
+                         */
+                        option = queue_path;
+                        if (*option != '/') {
+                                queue_path = malloc(strlen(option) + 2);
+                                if (!queue_path) {
+                                        perror("malloc()");
+                                        exit(1);
+                                }
+                                queue_path[0] = '/';
+                                queue_path[1] = 0;
+                                strcat(queue_path, option);
+                                free(option);
+                        }
+                        break;
+                }
+        }
+
+        if (continuous_mode && num_cpus_to_pin == 0) {
+                fprintf(stderr, "Must pass at least one CPU to continuous "
+                        "mode.\n");
+                poptPrintUsage(popt_context, stderr, 0);
+                exit(1);
+        } else if (!continuous_mode) {
+                num_cpus_to_pin = 1;
+                cpus_to_pin[0] = cpus_online - 1;
+        }
+
+        if (getuid() != 0) {
+                fprintf(stderr, "Not running as root, but almost all tests "
+                        "require root in order to modify\nsystem settings.  "
+                        "Exiting.\n");
+                exit(1);
+        }
+
+        max_msgs = fopen(MAX_MSGS, "r+");
+        max_msgsize = fopen(MAX_MSGSIZE, "r+");
+        if (!max_msgs)
+                shutdown(2, "Failed to open msg_max", __LINE__);
+        if (!max_msgsize)
+                shutdown(2, "Failed to open msgsize_max", __LINE__);
+
+        /* Load up the current system values for everything we can */
+        getr(RLIMIT_MSGQUEUE, &saved_limits);
+        cur_limits = saved_limits;
+        saved_max_msgs = cur_max_msgs = get(max_msgs);
+        saved_max_msgsize = cur_max_msgsize = get(max_msgsize);
+        errno = 0;
+        cur_nice = getpriority(PRIO_PROCESS, 0);
+        if (errno)
+                shutdown(2, "getpriority()", __LINE__);
+
+        /* Tell the user our initial state */
+        printf("\nInitial system state:\n");
+        printf("\tUsing queue path:\t\t\t%s\n", queue_path);
+        printf("\tRLIMIT_MSGQUEUE(soft):\t\t\t%d\n", saved_limits.rlim_cur);
+        printf("\tRLIMIT_MSGQUEUE(hard):\t\t\t%d\n", saved_limits.rlim_max);
+        printf("\tMaximum Message Size:\t\t\t%d\n", saved_max_msgsize);
+        printf("\tMaximum Queue Size:\t\t\t%d\n", saved_max_msgs);
+        printf("\tNice value:\t\t\t\t%d\n", cur_nice);
+        printf("\n");
+
+        increase_limits();
+
+        printf("Adjusted system state for testing:\n");
+        if (cur_limits.rlim_cur == RLIM_INFINITY) {
+                printf("\tRLIMIT_MSGQUEUE(soft):\t\t\t(unlimited)\n");
+                printf("\tRLIMIT_MSGQUEUE(hard):\t\t\t(unlimited)\n");
+        } else {
+                printf("\tRLIMIT_MSGQUEUE(soft):\t\t\t%d\n",
+                       cur_limits.rlim_cur);
+                printf("\tRLIMIT_MSGQUEUE(hard):\t\t\t%d\n",
+                       cur_limits.rlim_max);
+        }
+        printf("\tMaximum Message Size:\t\t\t%d\n", cur_max_msgsize);
+        printf("\tMaximum Queue Size:\t\t\t%d\n", cur_max_msgs);
+        printf("\tNice value:\t\t\t\t%d\n", cur_nice);
+        printf("\tContinuous mode:\t\t\t(%s)\n", continuous_mode ?
+               (continuous_mode_fake ? "fake mode" : "enabled") :
+               "disabled");
+        printf("\tCPUs to pin:\t\t\t\t%d", cpus_to_pin[0]);
+        for (cpu = 1; cpu < num_cpus_to_pin; cpu++)
+                        printf(",%d", cpus_to_pin[cpu]);
+        printf("\n");
+
+        sa.sa_sigaction = sig_action_SIGUSR1;
+        sigemptyset(&sa.sa_mask);
+        sigaddset(&sa.sa_mask, SIGHUP);
+        sigaddset(&sa.sa_mask, SIGINT);
+        sigaddset(&sa.sa_mask, SIGQUIT);
+        sigaddset(&sa.sa_mask, SIGTERM);
+        sa.sa_flags = SA_SIGINFO;
+        if (sigaction(SIGUSR1, &sa, NULL) == -1)
+                shutdown(1, "sigaction(SIGUSR1)", __LINE__);
+        sa.sa_sigaction = sig_action;
+        if (sigaction(SIGHUP, &sa, NULL) == -1)
+                shutdown(1, "sigaction(SIGHUP)", __LINE__);
+        if (sigaction(SIGINT, &sa, NULL) == -1)
+                shutdown(1, "sigaction(SIGINT)", __LINE__);
+        if (sigaction(SIGQUIT, &sa, NULL) == -1)
+                shutdown(1, "sigaction(SIGQUIT)", __LINE__);
+        if (sigaction(SIGTERM, &sa, NULL) == -1)
+                shutdown(1, "sigaction(SIGTERM)", __LINE__);
+
+        if (!continuous_mode_fake) {
+                attr.mq_flags = O_NONBLOCK;
+                attr.mq_maxmsg = cur_max_msgs;
+                attr.mq_msgsize = MSG_SIZE;
+                open_queue(&attr);
+        }
+        for (i = 0; i < num_cpus_to_pin; i++) {
+                pthread_attr_t thread_attr;
+                void *thread_func;
+
+                if (continuous_mode_fake)
+                        thread_func = &fake_cont_thread;
+                else if (continuous_mode)
+                        thread_func = &cont_thread;
+                else
+                        thread_func = &perf_test_thread;
+
+                CPU_ZERO_S(cpu_set_size, cpu_set);
+                CPU_SET_S(cpus_to_pin[i], cpu_set_size, cpu_set);
+                pthread_attr_init(&thread_attr);
+                pthread_attr_setaffinity_np(&thread_attr, cpu_set_size,
+                                            cpu_set);
+                if (pthread_create(&cpu_threads[i], &thread_attr, thread_func,
+                                   NULL))
+                        shutdown(1, "pthread_create()", __LINE__);
+                pthread_attr_destroy(&thread_attr);
+        }
+
+        if (!continuous_mode) {
+                pthread_join(cpu_threads[0], &retval);
+                shutdown((long)retval, "perf_test_thread()", __LINE__);
+        } else {
+                while (1)
+                        sleep(1);
+        }
+        shutdown(0, "", 0);
+}