Hi, On Sunday, November 09, 2014 04:57:51 PM Daniel Lezcano wrote: > On 11/07/2014 07:00 PM, Bartlomiej Zolnierkiewicz wrote: > > The following patch adds coupled cpuidle support for Exynos4210 to > > an existing cpuidle-exynos driver. As a result it enables AFTR mode > > to be used by default on Exynos4210 without the need to hot unplug > > CPU1 first. > > > > The patch is heavily based on earlier cpuidle-exynos4210 driver from > > Daniel Lezcano: > > > > http://www.spinics.net/lists/linux-samsung-soc/msg28134.html > > > > Changes from Daniel's code include: > > - porting code to current kernels > > - fixing it to work on my setup (by using S5P_INFORM register > > instead of S5P_VA_SYSRAM one on Revison 1.1 and retrying poking > > CPU1 out of the BOOT ROM if necessary) > > - fixing rare lockup caused by waiting for CPU1 to get stuck in > > the BOOT ROM (CPU hotplug code in arch/arm/mach-exynos/platsmp.c > > doesn't require this and works fine) > > - moving Exynos specific code to arch/arm/mach-exynos/pm.c > > - using cpu_boot_reg_base() helper instead of BOOT_VECTOR macro > > - using exynos_cpu_*() helpers instead of accessing registers > > directly > > - using arch_send_wakeup_ipi_mask() instead of dsb_sev() > > (this matches CPU hotplug code in arch/arm/mach-exynos/platsmp.c) > > I am curious. You experienced very rare hangs after running the tests a > few hours, right ? Is the SEV replaced by the IPI solving the issue ? If > yes, how did you catch it ? Rare hangs showed up after about 30-40 minutes of testing with the attached app and script (running of "./cpuidle_state1_test.sh script 2 500" has never completed on the umodified driver). The problem turned out to be in the following loop waiting for CPU1 to get stuck in the BOOT ROM: /* * Wait for cpu1 to get stuck in the boot rom */ while ((__raw_readl(BOOT_VECTOR) != 0) && !atomic_read(&cpu1_wakeup)) cpu_relax(); [ Removal of the loop fixed the problem. ] Using the SEV instead of the IPI was not a issue but it was changed to match the existing Exynos platform code (exynos_boot_secondary() in arch/arm/mach-exynos/platsmp.c) and as preparation for Exynos4412 (quad core) support. > >- integrating separate exynos4210-cpuidle driver into existing > > exynos-cpuidle one > > > > Cc: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx> > > Cc: Colin Cross <ccross@xxxxxxxxxx> > > Cc: Kukjin Kim <kgene.kim@xxxxxxxxxxx> > > Cc: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx> > > Cc: Tomasz Figa <tomasz.figa@xxxxxxxxx> > > Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx> > > Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx> Thanks! > A few comments below: > > > Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx> > > --- > > arch/arm/mach-exynos/common.h | 4 + > > arch/arm/mach-exynos/exynos.c | 4 + > > arch/arm/mach-exynos/platsmp.c | 2 +- > > arch/arm/mach-exynos/pm.c | 122 +++++++++++++++++++++++++++ > > drivers/cpuidle/Kconfig.arm | 1 + > > drivers/cpuidle/cpuidle-exynos.c | 62 ++++++++++++-- > > include/linux/platform_data/cpuidle-exynos.h | 20 +++++ > > 7 files changed, 209 insertions(+), 6 deletions(-) > > create mode 100644 include/linux/platform_data/cpuidle-exynos.h > > > > diff --git a/arch/arm/mach-exynos/common.h b/arch/arm/mach-exynos/common.h > > index d4d09bc..f208a60 100644 > > --- a/arch/arm/mach-exynos/common.h > > +++ b/arch/arm/mach-exynos/common.h > > @@ -14,6 +14,7 @@ > > > > #include <linux/reboot.h> > > #include <linux/of.h> > > +#include <linux/platform_data/cpuidle-exynos.h> > > > > #define EXYNOS3250_SOC_ID 0xE3472000 > > #define EXYNOS3_SOC_MASK 0xFFFFF000 > > @@ -168,8 +169,11 @@ extern void exynos_pm_central_suspend(void); > > extern int exynos_pm_central_resume(void); > > extern void exynos_enter_aftr(void); > > > > +extern struct cpuidle_exynos_data cpuidle_coupled_exynos_data; > > + > > extern void s5p_init_cpu(void __iomem *cpuid_addr); > > extern unsigned int samsung_rev(void); > > +extern void __iomem *cpu_boot_reg_base(void); > > > > static inline void pmu_raw_writel(u32 val, u32 offset) > > { > > diff --git a/arch/arm/mach-exynos/exynos.c b/arch/arm/mach-exynos/exynos.c > > index a487e59..4f4eb9e 100644 > > --- a/arch/arm/mach-exynos/exynos.c > > +++ b/arch/arm/mach-exynos/exynos.c > > @@ -317,6 +317,10 @@ static void __init exynos_dt_machine_init(void) > > if (!IS_ENABLED(CONFIG_SMP)) > > exynos_sysram_init(); > > > > +#ifdef CONFIG_ARM_EXYNOS_CPUIDLE > > + if (of_machine_is_compatible("samsung,exynos4210")) > > + exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data; > > +#endif > > You should not add those #ifdef. Without those #ifdef I get: LD init/built-in.o arch/arm/mach-exynos/built-in.o: In function `exynos_dt_machine_init': /home/bzolnier/sam/linux-sprc/arch/arm/mach-exynos/exynos.c:334: undefined reference to `cpuidle_coupled_exynos_data' make: *** [vmlinux] Error 1 when CONFIG_EXYNOS_CPU_SUSPEND is disabled. > > if (of_machine_is_compatible("samsung,exynos4210") || > > of_machine_is_compatible("samsung,exynos4212") || > > (of_machine_is_compatible("samsung,exynos4412") && > > diff --git a/arch/arm/mach-exynos/platsmp.c b/arch/arm/mach-exynos/platsmp.c > > index adb36a8..0e3ffc9 100644 > > --- a/arch/arm/mach-exynos/platsmp.c > > +++ b/arch/arm/mach-exynos/platsmp.c > > @@ -182,7 +182,7 @@ int exynos_cluster_power_state(int cluster) > > S5P_CORE_LOCAL_PWR_EN); > > } > > > > -static inline void __iomem *cpu_boot_reg_base(void) > > +void __iomem *cpu_boot_reg_base(void) > > { > > if (soc_is_exynos4210() && samsung_rev() == EXYNOS4210_REV_1_1) > > return pmu_base_addr + S5P_INFORM5; > > diff --git a/arch/arm/mach-exynos/pm.c b/arch/arm/mach-exynos/pm.c > > index 4b36ab5..44cc08a 100644 > > --- a/arch/arm/mach-exynos/pm.c > > +++ b/arch/arm/mach-exynos/pm.c > > @@ -178,3 +178,125 @@ void exynos_enter_aftr(void) > > > > cpu_pm_exit(); > > } > > + > > +static atomic_t cpu1_wakeup = ATOMIC_INIT(0); > > + > > +static int exynos_cpu0_enter_aftr(void) > > +{ > > + int ret = -1; > > + > > + /* > > + * If the other cpu is powered on, we have to power it off, because > > + * the AFTR state won't work otherwise > > + */ > > + if (cpu_online(1)) { > > + /* > > + * We reach a sync point with the coupled idle state, we know > > + * the other cpu will power down itself or will abort the > > + * sequence, let's wait for one of these to happen > > + */ > > + while (exynos_cpu_power_state(1)) { > > + /* > > + * The other cpu may skip idle and boot back > > + * up again > > + */ > > + if (atomic_read(&cpu1_wakeup)) > > + goto abort; > > + > > + /* > > + * The other cpu may bounce through idle and > > + * boot back up again, getting stuck in the > > + * boot rom code > > + */ > > + if (__raw_readl(cpu_boot_reg_base()) == 0) > > + goto abort; > > + > > + cpu_relax(); > > + } > > + } > > + > > + exynos_enter_aftr(); > > + ret = 0; > > + > > +abort: > > + if (cpu_online(1)) { > > + /* > > + * Set the boot vector to something non-zero > > + */ > > + __raw_writel(virt_to_phys(exynos_cpu_resume), > > + cpu_boot_reg_base()); > > + dsb(); > > + > > + /* > > + * Turn on cpu1 and wait for it to be on > > + */ > > + exynos_cpu_power_up(1); > > + while (exynos_cpu_power_state(1) != S5P_CORE_LOCAL_PWR_EN) > > + cpu_relax(); > > + > > + while (!atomic_read(&cpu1_wakeup)) { > > + /* > > + * Poke cpu1 out of the boot rom > > + */ > > + __raw_writel(virt_to_phys(exynos_cpu_resume), > > + cpu_boot_reg_base()); > > + > > + arch_send_wakeup_ipi_mask(cpumask_of(1)); > > + } > > + } > > + > > + return ret; > > +} > > + > > +static int exynos_wfi_finisher(unsigned long flags) > > +{ > > + cpu_do_idle(); > > + > > + return -1; > > +} > > + > > +static int exynos_cpu1_powerdown(void) > > +{ > > + int ret = -1; > > + > > + /* > > + * Idle sequence for cpu1 > > + */ > > + if (cpu_pm_enter()) > > + goto cpu1_aborted; > > + > > + /* > > + * Turn off cpu 1 > > + */ > > + exynos_cpu_power_down(1); > > + > > + ret = cpu_suspend(0, exynos_wfi_finisher); > > + > > + cpu_pm_exit(); > > + > > +cpu1_aborted: > > + dsb(); > > + /* > > + * Notify cpu 0 that cpu 1 is awake > > + */ > > + atomic_set(&cpu1_wakeup, 1); > > + > > + return ret; > > +} > > + > > +static void exynos_pre_enter_aftr(void) > > +{ > > + __raw_writel(virt_to_phys(exynos_cpu_resume), cpu_boot_reg_base()); > > +} > > + > > +static void exynos_post_enter_aftr(void) > > +{ > > + atomic_set(&cpu1_wakeup, 0); > > +} > > + > > +struct cpuidle_exynos_data cpuidle_coupled_exynos_data = { > > + .cpu0_enter_aftr = exynos_cpu0_enter_aftr, > > + .cpu1_powerdown = exynos_cpu1_powerdown, > > + .pre_enter_aftr = exynos_pre_enter_aftr, > > + .post_enter_aftr = exynos_post_enter_aftr, > > +}; > > diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm > > index 8c16ab2..8e07c94 100644 > > --- a/drivers/cpuidle/Kconfig.arm > > +++ b/drivers/cpuidle/Kconfig.arm > > @@ -55,6 +55,7 @@ config ARM_AT91_CPUIDLE > > config ARM_EXYNOS_CPUIDLE > > bool "Cpu Idle Driver for the Exynos processors" > > depends on ARCH_EXYNOS > > + select ARCH_NEEDS_CPU_IDLE_COUPLED if SMP > > help > > Select this to enable cpuidle for Exynos processors > > > > diff --git a/drivers/cpuidle/cpuidle-exynos.c b/drivers/cpuidle/cpuidle-exynos.c > > index ba9b34b..4700d5d 100644 > > --- a/drivers/cpuidle/cpuidle-exynos.c > > +++ b/drivers/cpuidle/cpuidle-exynos.c > > @@ -1,8 +1,11 @@ > > -/* linux/arch/arm/mach-exynos/cpuidle.c > > - * > > - * Copyright (c) 2011 Samsung Electronics Co., Ltd. > > +/* > > + * Copyright (c) 2011-2014 Samsung Electronics Co., Ltd. > > * http://www.samsung.com > > * > > + * Coupled cpuidle support based on the work of: > > + * Colin Cross <ccross@xxxxxxxxxxx> > > + * Daniel Lezcano <daniel.lezcano@xxxxxxxxxx> > > + * > > * This program is free software; you can redistribute it and/or modify > > * it under the terms of the GNU General Public License version 2 as > > * published by the Free Software Foundation. > > @@ -13,13 +16,49 @@ > > #include <linux/export.h> > > #include <linux/module.h> > > #include <linux/platform_device.h> > > +#include <linux/of.h> > > +#include <linux/platform_data/cpuidle-exynos.h> > > > > #include <asm/proc-fns.h> > > #include <asm/suspend.h> > > #include <asm/cpuidle.h> > > > > +static atomic_t exynos_idle_barrier; > > + > > +static struct cpuidle_exynos_data *exynos_cpuidle_pdata; > > static void (*exynos_enter_aftr)(void); > > > > +static int exynos_enter_coupled_lowpower(struct cpuidle_device *dev, > > + struct cpuidle_driver *drv, > > + int index) > > +{ > > + int ret; > > + > > + exynos_cpuidle_pdata->pre_enter_aftr(); > > + > > + /* > > + * Waiting all cpus to reach this point at the same moment > > + */ > > + cpuidle_coupled_parallel_barrier(dev, &exynos_idle_barrier); > > + > > + /* > > + * Both cpus will reach this point at the same time > > + */ > > + ret = dev->cpu ? exynos_cpuidle_pdata->cpu1_powerdown() > > + : exynos_cpuidle_pdata->cpu0_enter_aftr(); > > + if (ret) > > + index = ret; > > + > > + /* > > + * Waiting all cpus to finish the power sequence before going further > > + */ > > + cpuidle_coupled_parallel_barrier(dev, &exynos_idle_barrier); > > + > > + exynos_cpuidle_pdata->post_enter_aftr(); > > + > > + return index; > > +} > > + > > static int exynos_enter_lowpower(struct cpuidle_device *dev, > > struct cpuidle_driver *drv, > > int index) > > @@ -58,11 +97,24 @@ static struct cpuidle_driver exynos_idle_driver = { > > > > static int exynos_cpuidle_probe(struct platform_device *pdev) > > { > > + const struct cpumask *coupled_cpus = NULL; > > int ret; > > > > - exynos_enter_aftr = (void *)(pdev->dev.platform_data); > > + if (of_machine_is_compatible("samsung,exynos4210")) { > > + exynos_cpuidle_pdata = pdev->dev.platform_data; > > + > > + exynos_idle_driver.states[1].enter = > > + exynos_enter_coupled_lowpower; > > + exynos_idle_driver.states[1].exit_latency = 5000; > > + exynos_idle_driver.states[1].target_residency = 10000; > > + exynos_idle_driver.states[1].flags |= CPUIDLE_FLAG_COUPLED | > > + CPUIDLE_FLAG_TIMER_STOP; > > I tried to remove those dynamic state allocation everywhere in the > different drivers. I would prefer to have another cpuidle_driver to be > registered with its states instead of overwriting the existing idle state. > > struct cpuidle_driver exynos4210_idle_driver = { > .name = "exynos4210_idle", > .owner = THIS_MODULE, > .states = { > [0] = ARM_CPUIDLE_WFI_STATE, > [1] = { > .enter = exynos_enter_coupled_lowpower, > .exit_latency = 5000, > .target_residency = 10000, > .flags = CPUIDLE_FLAG_TIME_VALID | > CPUIDLE_FLAG_COUPLED | > CPUIDLE_FLAG_TIMER_STOP, > .name = "C1", > .desc = "ARM power down", > }, > } > }; > > > and then: > > if (of_machine_is_compatible("samsung,exynos4210")) { > ... > ret = cpuidle_register(&exynos4210_idle_driver, > cpu_online_mask); > ... > } > ... OK, I will fix it but (if you are OK with it) I will make the code use "exynos_coupled" naming instead of "exynos4210" one to not have to change it later. > If we can reuse this mechanism, which I believe it is possible to, for > 4420 and 5250. Then we will be able to refactor this out again. I plan to add support for Exynos3250 next as it should be the simplest (it is also dual core) and I need it for other reasons anyway. Exynos4412 (quad core) support requires more work but should also be doable. When it comes to Exynos5250 I was thinking about disabling normal AFTR mode support for it as according to my testing (on Arndale board) it has never worked (at least in upstream kernels, I don't know about Linaro or internal ones). Best regards, -- Bartlomiej Zolnierkiewicz Samsung R&D Institute Poland Samsung Electronics > > + > > + coupled_cpus = cpu_possible_mask; > > + } else > > + exynos_enter_aftr = (void *)(pdev->dev.platform_data); > > > > - ret = cpuidle_register(&exynos_idle_driver, NULL); > > + ret = cpuidle_register(&exynos_idle_driver, coupled_cpus); > > if (ret) { > > dev_err(&pdev->dev, "failed to register cpuidle driver\n"); > > return ret; > > diff --git a/include/linux/platform_data/cpuidle-exynos.h b/include/linux/platform_data/cpuidle-exynos.h > > new file mode 100644 > > index 0000000..bfa40e4 > > --- /dev/null > > +++ b/include/linux/platform_data/cpuidle-exynos.h > > @@ -0,0 +1,20 @@ > > +/* > > + * Copyright (c) 2014 Samsung Electronics Co., Ltd. > > + * http://www.samsung.com > > + * > > + * This program is free software; you can redistribute it and/or modify > > + * it under the terms of the GNU General Public License version 2 as > > + * published by the Free Software Foundation. > > +*/ > > + > > +#ifndef __CPUIDLE_EXYNOS_H > > +#define __CPUIDLE_EXYNOS_H > > + > > +struct cpuidle_exynos_data { > > + int (*cpu0_enter_aftr)(void); > > + int (*cpu1_powerdown)(void); > > + void (*pre_enter_aftr)(void); > > + void (*post_enter_aftr)(void); > > +}; > > + > > +#endif
Attachment:
cpuidle_state1_test.sh
Description: application/shellscript
CROSS_COMPILE ?= arm-linux-gnueabi- CC = $(CROSS_COMPILE)gcc OBJS = sched_task # -static needed for cross building for old EGLIBC on newer GLIBC # Example: Building for Rinato (Eglibc-2.13) on Glibc-2.19 CFLAGS = -static-libgcc -static # -lrt for clock_gettime when Glibc < 2.17 LDFLAGS = -lrt all: $(OBJS) %.o : %.c $(CC) $(CFLAGS) -c $< -o $@ $(LDFLAGS) % : %.c $(CC) $(CFLAGS) $< -o $@ $(LDFLAGS) clean: rm -f *.o rm -f $(OBJS)
/*
sched_task - scheduler test task -> for power evaluation
Copyright (C) 2013 Lukasz Majewski <l.majewski@xxxxxxxxxxx>
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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
USA
*/
/* This is based on the pi_stress.c rt-test program by Clark Williams */
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <sched.h>
#include <sys/mman.h>
#include <string.h>
#include <getopt.h>
#define NSEC_PER_SEC 1000000000
#define USEC_TO_NSEC 1000
#define TIME_MIN 100000 /* 100 us minimal time */
#define TEST_TAB_SIZE 512
/*
* TODO: add support for chosing schedule policy (other, idle, rt)
*/
int sched_policy = SCHED_FIFO;
int priority = 10;
int task_period = 0;
int task_count = 0;
int work_time = 0;
int work_count = 0;
int work_offset = 0;
int lockall_flag = 0;
int debug_flag = 0;
#define DBG(fmt, args...) do { \
if (debug_flag) \
printf(fmt, args); \
} while (0);
/* command line options */
struct option options[] = {
{"tperiod", required_argument, NULL, 't'},
{"work", required_argument, NULL, 'w'},
{"count", required_argument, NULL, 'c'},
{"offset", required_argument, NULL, 'o'},
{"prio", no_argument, NULL, 'p'},
{"debug", no_argument, &debug_flag, 'd'},
{"mlockall", no_argument, &lockall_flag, 'm'},
{"help", no_argument, NULL, 'h'},
{"sched_other", no_argument, NULL, 's'},
{NULL, 0, NULL, 0},
};
void busy_test(void)
{
volatile static unsigned char test[TEST_TAB_SIZE];
int i, j;
for(i = 0xFF; i; i--)
for(j = 0; j < sizeof(test); j++)
test[j] = i;
}
int adjust_wakeup_time(struct timespec *t, int time)
{
t->tv_nsec += time;
while (t->tv_nsec >= NSEC_PER_SEC) {
t->tv_nsec -= NSEC_PER_SEC;
t->tv_sec++;
}
return 0;
}
int time_passed(struct timespec *x, struct timespec *y, struct timespec *result)
{
result->tv_sec = x->tv_sec - y->tv_sec;
result->tv_nsec = x->tv_nsec - y->tv_nsec;
if (result->tv_nsec < 0) {
--result->tv_sec;
result->tv_nsec += NSEC_PER_SEC;
}
/* Return 1 if result is negative. */
return result->tv_sec < 0;
}
void usage(void)
{
printf("usage: sched_task <options>\n");
printf(" options:\n");
printf("\t--prio\t\t- specify priority [real time] of the task\n");
printf("\t--work\t\t- specify time the task is executed [us]\n");
printf("\t--count\t\t- specify how many times the task is executed\n");
printf("\t\t\t- if --count is specified but --work is not then\n");
printf("\t\t\t the task will be executed (count/10) times before\n");
printf("\t\t\t each sleep time\n");
printf("\t\t\t- if both --count and --work are specified then\n");
printf("\t\t\t the task will be executed for --work time before\n");
printf("\t\t\t going to sleep\n");
printf("\t--offset\t- specify time after which execution starts [us]\n");
printf("\t--tperiod\t- specify period of the task [us]\n");
printf("\t--mlockall\t- lock current and future memory\n");
printf("\t--sched_other\t- use standard SCHED_OTHER scheduling policy for normal\n");
printf("\t\t\t task; priority will be ignored\n");
printf("\t--debug\t\t- turn on debug prints\n");
printf("\t--help\t\t- print this message\n");
}
void process_command_line(int argc, char **argv)
{
int opt;
while ((opt = getopt_long(argc, argv, "+", options, NULL)) != -1) {
switch (opt) {
case '?':
case 'h':
usage();
exit(0);
case 'p':
priority = strtol(optarg, NULL, 10);
break;
case 's':
sched_policy = SCHED_OTHER;
break;
case 't':
task_period = strtoul(optarg, NULL, 10) * USEC_TO_NSEC;
break;
case 'w':
work_time = strtoul(optarg, NULL, 10) * USEC_TO_NSEC;
break;
case 'c':
task_count = strtoul(optarg, NULL, 10);
break;
case 'o':
work_offset = strtoul(optarg, NULL, 10) * USEC_TO_NSEC;
break;
}
}
if (!work_time)
work_count = task_count / 10;
}
int main(int argc, char* argv[])
{
struct timespec t, tt, ttt, result;
struct sched_param param;
int count = 0;
process_command_line(argc, argv);
if(work_time > task_period) {
perror("Wrong value of \'work\' time");
exit(-1);
}
if(task_period < TIME_MIN) {
error(0, 0, "Task period time (%d) must be grater than %d [us]\n",
task_period/1000, TIME_MIN/1000);
exit(-1);
}
if(work_time && (work_time < TIME_MIN)) {
error(0, 0, "Work time (%d) must be grater than %d [us]\n",
work_time/1000, TIME_MIN/1000);
exit(-1);
}
if (task_count < 0) {
perror("Wrong value for --count\n");
exit(-1);
}
if (!work_time && !task_count) {
perror("At least one of (--work,--count) must be provided\n");
exit(-1);
}
if ((sched_policy != SCHED_FIFO) && (sched_policy != SCHED_RR))
priority = 0;
param.sched_priority = priority;
if(sched_setscheduler(0, sched_policy, ¶m) == -1) {
perror("sched_setscheduler for policy %d failed\n");
}
if (lockall_flag)
if(mlockall(MCL_CURRENT|MCL_FUTURE) == -1) {
perror("mlockall failed");
exit(-2);
}
clock_gettime(CLOCK_MONOTONIC ,&t);
adjust_wakeup_time(&t, work_offset);
while(!task_count || (count < task_count)) {
/* wait until next shot */
clock_nanosleep(CLOCK_MONOTONIC, TIMER_ABSTIME, &t, NULL);
clock_gettime(CLOCK_MONOTONIC ,&tt);
clock_gettime(CLOCK_MONOTONIC ,&ttt);
DBG("t:%d %d tt:%d %d ", t.tv_sec, t.tv_nsec,
tt.tv_sec, tt.tv_nsec);
adjust_wakeup_time(&tt, work_time);
if (work_time) {
do {
busy_test();
clock_gettime(CLOCK_MONOTONIC ,&ttt);
count++;
} while (!time_passed(&tt, &ttt, &result));
} else {
int i = 0;
do {
busy_test();
clock_gettime(CLOCK_MONOTONIC ,&ttt);
count++;
} while (++i < work_count);
}
DBG("tt:%d %d ttt:%d %d\n", tt.tv_sec, tt.tv_nsec,
ttt.tv_sec, ttt.tv_nsec);
/* calculate next shot */
adjust_wakeup_time(&t, task_period);
}
printf("Work executions: %d\n", count);
}
