Subject: [merged] selftests-add-basic-posix-timers-selftests.patch removed from -mm tree To: fweisbec@xxxxxxxxx,a.p.zijlstra@xxxxxxxxx,rostedt@xxxxxxxxxxx,sgruszka@xxxxxxxxxx,tglx@xxxxxxxxxxxxx,mm-commits@xxxxxxxxxxxxxxx From: akpm@xxxxxxxxxxxxxxxxxxxx Date: Mon, 08 Jul 2013 12:37:44 -0700 The patch titled Subject: selftests: add basic posix timers selftests has been removed from the -mm tree. Its filename was selftests-add-basic-posix-timers-selftests.patch This patch was dropped because it was merged into mainline or a subsystem tree ------------------------------------------------------ From: Frederic Weisbecker <fweisbec@xxxxxxxxx> Subject: selftests: add basic posix timers selftests Add some initial basic tests on a few posix timers interface such as setitimer() and timer_settime(). These simply check that expiration happens in a reasonable timeframe after expected elapsed clock time (user time, user + system time, real time, ...). This is helpful for finding basic breakages while hacking on this subsystem. Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx> Cc: Stanislaw Gruszka <sgruszka@xxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- tools/testing/selftests/Makefile | 1 tools/testing/selftests/timers/Makefile | 8 tools/testing/selftests/timers/posix_timers.c | 221 ++++++++++++++++ 3 files changed, 230 insertions(+) diff -puN tools/testing/selftests/Makefile~selftests-add-basic-posix-timers-selftests tools/testing/selftests/Makefile --- a/tools/testing/selftests/Makefile~selftests-add-basic-posix-timers-selftests +++ a/tools/testing/selftests/Makefile @@ -6,6 +6,7 @@ TARGETS += memory-hotplug TARGETS += mqueue TARGETS += net TARGETS += ptrace +TARGETS += timers TARGETS += vm all: diff -puN /dev/null tools/testing/selftests/timers/Makefile --- /dev/null +++ a/tools/testing/selftests/timers/Makefile @@ -0,0 +1,8 @@ +all: + gcc posix_timers.c -o posix_timers -lrt + +run_tests: all + ./posix_timers + +clean: + rm -f ./posix_timers diff -puN /dev/null tools/testing/selftests/timers/posix_timers.c --- /dev/null +++ a/tools/testing/selftests/timers/posix_timers.c @@ -0,0 +1,221 @@ +/* + * Copyright (C) 2013 Red Hat, Inc., Frederic Weisbecker <fweisbec@xxxxxxxxxx> + * + * Licensed under the terms of the GNU GPL License version 2 + * + * Selftests for a few posix timers interface. + * + * Kernel loop code stolen from Steven Rostedt <srostedt@xxxxxxxxxx> + */ + +#include <sys/time.h> +#include <stdio.h> +#include <signal.h> +#include <unistd.h> +#include <time.h> +#include <pthread.h> + +#define DELAY 2 +#define USECS_PER_SEC 1000000 + +static volatile int done; + +/* Busy loop in userspace to elapse ITIMER_VIRTUAL */ +static void user_loop(void) +{ + while (!done); +} + +/* + * Try to spend as much time as possible in kernelspace + * to elapse ITIMER_PROF. + */ +static void kernel_loop(void) +{ + void *addr = sbrk(0); + + while (!done) { + brk(addr + 4096); + brk(addr); + } +} + +/* + * Sleep until ITIMER_REAL expiration. + */ +static void idle_loop(void) +{ + pause(); +} + +static void sig_handler(int nr) +{ + done = 1; +} + +/* + * Check the expected timer expiration matches the GTOD elapsed delta since + * we armed the timer. Keep a 0.5 sec error margin due to various jitter. + */ +static int check_diff(struct timeval start, struct timeval end) +{ + long long diff; + + diff = end.tv_usec - start.tv_usec; + diff += (end.tv_sec - start.tv_sec) * USECS_PER_SEC; + + if (abs(diff - DELAY * USECS_PER_SEC) > USECS_PER_SEC / 2) { + printf("Diff too high: %lld..", diff); + return -1; + } + + return 0; +} + +static int check_itimer(int which) +{ + int err; + struct timeval start, end; + struct itimerval val = { + .it_value.tv_sec = DELAY, + }; + + printf("Check itimer "); + + if (which == ITIMER_VIRTUAL) + printf("virtual... "); + else if (which == ITIMER_PROF) + printf("prof... "); + else if (which == ITIMER_REAL) + printf("real... "); + + fflush(stdout); + + done = 0; + + if (which == ITIMER_VIRTUAL) + signal(SIGVTALRM, sig_handler); + else if (which == ITIMER_PROF) + signal(SIGPROF, sig_handler); + else if (which == ITIMER_REAL) + signal(SIGALRM, sig_handler); + + err = gettimeofday(&start, NULL); + if (err < 0) { + perror("Can't call gettimeofday()\n"); + return -1; + } + + err = setitimer(which, &val, NULL); + if (err < 0) { + perror("Can't set timer\n"); + return -1; + } + + if (which == ITIMER_VIRTUAL) + user_loop(); + else if (which == ITIMER_PROF) + kernel_loop(); + else if (which == ITIMER_REAL) + idle_loop(); + + gettimeofday(&end, NULL); + if (err < 0) { + perror("Can't call gettimeofday()\n"); + return -1; + } + + if (!check_diff(start, end)) + printf("[OK]\n"); + else + printf("[FAIL]\n"); + + return 0; +} + +static int check_timer_create(int which) +{ + int err; + timer_t id; + struct timeval start, end; + struct itimerspec val = { + .it_value.tv_sec = DELAY, + }; + + printf("Check timer_create() "); + if (which == CLOCK_THREAD_CPUTIME_ID) { + printf("per thread... "); + } else if (which == CLOCK_PROCESS_CPUTIME_ID) { + printf("per process... "); + } + fflush(stdout); + + done = 0; + timer_create(which, NULL, &id); + if (err < 0) { + perror("Can't create timer\n"); + return -1; + } + signal(SIGALRM, sig_handler); + + err = gettimeofday(&start, NULL); + if (err < 0) { + perror("Can't call gettimeofday()\n"); + return -1; + } + + err = timer_settime(id, 0, &val, NULL); + if (err < 0) { + perror("Can't set timer\n"); + return -1; + } + + user_loop(); + + gettimeofday(&end, NULL); + if (err < 0) { + perror("Can't call gettimeofday()\n"); + return -1; + } + + if (!check_diff(start, end)) + printf("[OK]\n"); + else + printf("[FAIL]\n"); + + return 0; +} + +int main(int argc, char **argv) +{ + int err; + + printf("Testing posix timers. False negative may happen on CPU execution \n"); + printf("based timers if other threads run on the CPU...\n"); + + if (check_itimer(ITIMER_VIRTUAL) < 0) + return -1; + + if (check_itimer(ITIMER_PROF) < 0) + return -1; + + if (check_itimer(ITIMER_REAL) < 0) + return -1; + + if (check_timer_create(CLOCK_THREAD_CPUTIME_ID) < 0) + return -1; + + /* + * It's unfortunately hard to reliably test a timer expiration + * on parallel multithread cputime. We could arm it to expire + * on DELAY * nr_threads, with nr_threads busy looping, then wait + * the normal DELAY since the time is elapsing nr_threads faster. + * But for that we need to ensure we have real physical free CPUs + * to ensure true parallelism. So test only one thread until we + * find a better solution. + */ + if (check_timer_create(CLOCK_PROCESS_CPUTIME_ID) < 0) + return -1; + + return 0; +} _ Patches currently in -mm which might be from fweisbec@xxxxxxxxx are origin.patch linux-next.patch ptrace-x86-revert-hw_breakpoints-fix-racy-access-to-ptrace-breakpoints.patch ptrace-powerpc-revert-hw_breakpoints-fix-racy-access-to-ptrace-breakpoints.patch ptrace-arm-revert-hw_breakpoints-fix-racy-access-to-ptrace-breakpoints.patch ptrace-sh-revert-hw_breakpoints-fix-racy-access-to-ptrace-breakpoints.patch ptrace-revert-prepare-to-fix-racy-accesses-on-task-breakpoints.patch ptrace-x86-simplify-the-disable-logic-in-ptrace_write_dr7.patch ptrace-x86-dont-delay-disable-till-second-pass-in-ptrace_write_dr7.patch ptrace-x86-introduce-ptrace_register_breakpoint.patch ptrace-x86-ptrace_write_dr7-should-create-bp-if-disabled.patch ptrace-x86-cleanup-ptrace_set_debugreg.patch ptrace-ptrace_detach-should-do-flush_ptrace_hw_breakpointchild.patch ptrace-x86-flush_ptrace_hw_breakpoint-shoule-clear-the-virtual-debug-registers.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html