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mcreboot: -h to indicate halting CPU in idle threads (e.g., in futex_wait())

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This commit is contained in:
Balazs Gerofi
2017-12-18 11:22:15 +09:00
parent bf2f38051b
commit 589504dc33
5 changed files with 26 additions and 5 deletions
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7
arch/x86_64/tools/mcreboot-smp-x86.sh.in
View File

@@ -44,8 +44,9 @@ fi
turbo=""
ihk_irq=""
umask_old=`umask`
idle_halt=""
while getopts :tk:c:m:o:f:r:q:i:d:e: OPT
while getopts :tk:c:m:o:f:r:q:i:d:e:h OPT
do
case ${OPT} in
f) facility=${OPTARG}
@@ -70,6 +71,8 @@ do
;;
i) mon_interval=${OPTARG}
;;
h) idle_halt="idle_halt"
;;
*) echo "invalid option -${OPT}" >&2
exit 1
esac
@@ -408,7 +411,7 @@ if ! ${SBINDIR}/ihkosctl 0 load ${KERNDIR}/mckernel.img; then
fi
# Set kernel arguments
if ! ${SBINDIR}/ihkosctl 0 kargs "hidos $turbo dump_level=${DUMP_LEVEL} $extra_kopts"; then
if ! ${SBINDIR}/ihkosctl 0 kargs "hidos $turbo $idle_halt dump_level=${DUMP_LEVEL} $extra_kopts"; then
echo "error: setting kernel arguments" >&2
error_exit "os_created"
fi

8
kernel/futex.c
View File

@@ -673,9 +673,11 @@ static uint64_t futex_wait_queue_me(struct futex_hash_bucket *hb, struct futex_q
xchg4(&(cpu_local_var(current)->status), PS_INTERRUPTIBLE);
/* Indicate spin sleep */
irqstate = ihk_mc_spinlock_lock(&thread->spin_sleep_lock);
thread->spin_sleep = 1;
ihk_mc_spinlock_unlock(&thread->spin_sleep_lock, irqstate);
if (!idle_halt) {
irqstate = ihk_mc_spinlock_lock(&thread->spin_sleep_lock);
thread->spin_sleep = 1;
ihk_mc_spinlock_unlock(&thread->spin_sleep_lock, irqstate);
}
queue_me(q, hb);

1
kernel/include/process.h
View File

@@ -277,6 +277,7 @@ struct resource_set {
extern struct list_head resource_set_list;
extern mcs_rwlock_lock_t resource_set_lock;
extern int idle_halt;
struct process_hash {
struct list_head list[HASH_SIZE];

6
kernel/init.c
View File

@@ -144,6 +144,12 @@ static void parse_kargs(void)
}
}
ihk_mc_set_dump_level(dump_level);
/* idle_halt option */
ptr = find_command_line("idle_halt");
if (ptr) {
idle_halt = 1;
}
}
extern void ihk_mc_get_boot_time(unsigned long *tv_sec, unsigned long *tv_nsec);

9
kernel/process.c
View File

@@ -100,6 +100,8 @@ extern void perf_reset(struct mc_perf_event *event);
struct list_head resource_set_list;
mcs_rwlock_lock_t resource_set_lock;
int idle_halt = 0;
void
init_process(struct process *proc, struct process *parent)
{
@@ -3044,6 +3046,12 @@ void spin_sleep_or_schedule(void)
int woken = 0;
long irqstate;
/* Spinning disabled explicitly */
if (idle_halt) {
dkprintf("%s: idle_halt -> schedule()\n", __FUNCTION__);
goto out_schedule;
}
/* Try to spin sleep */
irqstate = ihk_mc_spinlock_lock(&thread->spin_sleep_lock);
if (thread->spin_sleep == 0) {
@@ -3092,6 +3100,7 @@ void spin_sleep_or_schedule(void)
cpu_pause();
}
out_schedule:
schedule();
}