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do_syscall(): allow descheduling threads in offloaded syscalls if CPU core oversubscribed

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This commit is contained in:
Balazs Gerofi
2016-08-16 08:58:22 +09:00
parent c897a56c34
commit 3aa06444f4
4 changed files with 65 additions and 24 deletions
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21
kernel/host.c
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@ -559,6 +559,7 @@ static int syscall_packet_handler(struct ihk_ikc_channel_desc *c,
struct ikc_scd_packet *packet = __packet;
struct ikc_scd_packet pckt;
int rc;
struct mcs_rwlock_node_irqsave lock;
struct thread *thread;
struct process *proc;
struct mcctrl_signal {
@ -625,6 +626,26 @@ static int syscall_packet_handler(struct ihk_ikc_channel_desc *c,
ret = 0;
break;
/*
* Used for syscall offload reply message to explicitly schedule in
* the waiting thread
*/
case SCD_MSG_WAKE_UP_SYSCALL_THREAD:
thread = find_thread(0, packet->ttid, &lock);
if (!thread) {
kprintf("%s: WARNING: no thread for SCD reply? TID: %d\n",
__FUNCTION__, packet->ttid);
ret = -EINVAL;
break;
}
thread_unlock(thread, &lock);
dkprintf("%s: SCD_MSG_WAKE_UP_SYSCALL_THREAD: waking up tid %d\n",
__FUNCTION__, packet->ttid);
waitq_wakeup(&thread->scd_wq);
ret = 0;
break;
case SCD_MSG_SEND_SIGNAL:
pp = ihk_mc_map_memory(NULL, packet->arg, sizeof(struct mcctrl_signal));
sp = (struct mcctrl_signal *)ihk_mc_map_virtual(pp, 1, PTATTR_WRITABLE | PTATTR_ACTIVE);