leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

selftests/timers: Add skew_consistency test from the timetests suite

Browse Source 
This change adds the skew_consistency test, which twists the
ADJ_FREQUENCY knob back and forth and watches for timekeeping
inconsistencies.

Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Tested-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
This commit is contained in:
John Stultz 2015-03-11 17:40:09 -07:00 committed by Shuah Khan
parent d869424558
commit 6e8b285bcd
2 changed files with 91 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
tools/testing/selftests/timers/Makefile
View File

@ -4,7 +4,7 @@ CFLAGS += -O3 -Wl,-no-as-needed -Wall $(BUILD_FLAGS)
LDFLAGS += -lrt -lpthread
bins = posix_timers nanosleep inconsistency-check nsleep-lat raw_skew \
set-timer-lat threadtest mqueue-lat valid-adjtimex \
alarmtimer-suspend change_skew
alarmtimer-suspend change_skew skew_consistency
all: ${bins}
@ -27,6 +27,7 @@ run_destructive_tests: run_tests
./alarmtimer-suspend
./valid-adjtimex
./change_skew
./skew_consistency
clean:
rm -f ${bins}

89
tools/testing/selftests/timers/skew_consistency.c Normal file
View File

@ -0,0 +1,89 @@
/* ADJ_FREQ Skew consistency test
* by: john stultz (johnstul@us.ibm.com)
* (C) Copyright IBM 2012
* Licensed under the GPLv2
*
* NOTE: This is a meta-test which cranks the ADJ_FREQ knob back
* and forth and watches for consistency problems. Thus this test requires
* that the inconsistency-check tests be present in the same directory it
* is run from.
*
* To build:
* $ gcc skew_consistency.c -o skew_consistency -lrt
*
* This program 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, either version 2 of the License, or
* (at your option) any later version.
*
* This program 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/timex.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
#ifdef KTEST
#include "../kselftest.h"
#else
static inline int ksft_exit_pass(void)
{
exit(0);
}
static inline int ksft_exit_fail(void)
{
exit(1);
}
#endif
#define NSEC_PER_SEC 1000000000LL
int main(int argv, char **argc)
{
struct timex tx;
int ret, ppm;
pid_t pid;
printf("Running Asyncrhonous Frequency Changing Tests...\n");
pid = fork();
if (!pid)
return system("./inconsistency-check -c 1 -t 600");
ppm = 500;
ret = 0;
while (pid != waitpid(pid, &ret, WNOHANG)) {
ppm = -ppm;
tx.modes = ADJ_FREQUENCY;
tx.freq = ppm << 16;
adjtimex(&tx);
usleep(500000);
}
/* Set things back */
tx.modes = ADJ_FREQUENCY;
tx.offset = 0;
adjtimex(&tx);
if (ret) {
printf("[FAILED]\n");
return ksft_exit_fail();
}
printf("[OK]\n");
return ksft_exit_pass();
}