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remote_page_fault is handled by the offloaded thread.

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Change-Id: I9cfad509260cceada74abdf39ca6a1822561e0d9
Refs: #1474
This commit is contained in:
Tomoki Shirasawa
2021-02-09 19:26:20 +09:00
committed by Masamichi Takagi
parent 9c7d0cfaec
commit 7efb394905
14 changed files with 957 additions and 32 deletions
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95
kernel/host.c
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@ -658,6 +658,58 @@ void send_procfs_answer(struct ikc_scd_packet *packet, int err)
syscall_channel_send(resp_channel, &pckt);
}
static void do_remote_page_fault(struct ikc_scd_packet *packet, int err)
{
struct ikc_scd_packet pckt;
struct ihk_ikc_channel_desc *resp_channel = cpu_local_var(ikc2linux);
struct thread *thread = cpu_local_var(current);
unsigned long t_s = 0;
if (err) {
goto out_remote_pf;
}
#ifdef PROFILE_ENABLE
/* We cannot use thread->profile_start_ts here because the
* caller may be utilizing it already
*/
if (thread->profile) {
t_s = rdtsc();
}
#endif // PROFILE_ENABLE
dkprintf("remote page fault,pid=%d,va=%lx,reason=%x\n",
thread->proc->pid, packet->fault_address,
packet->fault_reason|PF_POPULATE);
preempt_disable();
pckt.err = page_fault_process_vm(thread->vm,
(void *)packet->fault_address,
packet->fault_reason|PF_POPULATE);
preempt_enable();
#ifdef PROFILE_ENABLE
if (thread->profile) {
profile_event_add(PROFILE_remote_page_fault,
(rdtsc() - t_s));
}
#endif // PROFILE_ENABLE
out_remote_pf:
pckt.err = err;
pckt.msg = SCD_MSG_REMOTE_PAGE_FAULT_ANSWER;
pckt.ref = packet->ref;
pckt.arg = packet->arg;
pckt.reply = packet->reply;
pckt.pid = packet->pid;
syscall_channel_send(resp_channel, &pckt);
}
static void remote_page_fault(void *arg)
{
do_remote_page_fault(arg, 0);
}
static int syscall_packet_handler(struct ihk_ikc_channel_desc *c,
void *__packet, void *ihk_os)
{
@ -680,7 +732,6 @@ static int syscall_packet_handler(struct ihk_ikc_channel_desc *c,
int ret = 0;
struct perf_ctrl_desc *pcd;
unsigned int mode = 0;
unsigned long t_s = 0;
switch (packet->msg) {
case SCD_MSG_INIT_CHANNEL_ACKED:
@ -747,42 +798,22 @@ static int syscall_packet_handler(struct ihk_ikc_channel_desc *c,
if (!thread) {
kprintf("%s: WARNING: no thread for remote pf %d\n",
__func__, packet->fault_tid);
pckt.err = ret = -EINVAL;
goto out_remote_pf;
do_remote_page_fault(packet, -EINVAL);
break;
}
#ifdef PROFILE_ENABLE
/* We cannot use thread->profile_start_ts here because the
* caller may be utilizing it already */
if (thread->profile) {
t_s = rdtsc();
if (thread == cpu_local_var(current)) {
do_remote_page_fault(packet, 0);
}
#endif // PROFILE_ENABLE
dkprintf("remote page fault,pid=%d,va=%lx,reason=%x\n",
thread->proc->pid, packet->fault_address,
packet->fault_reason|PF_POPULATE);
preempt_disable();
pckt.err = page_fault_process_vm(thread->vm,
(void *)packet->fault_address,
packet->fault_reason|PF_POPULATE);
preempt_enable();
#ifdef PROFILE_ENABLE
if (thread->profile) {
profile_event_add(PROFILE_remote_page_fault,
(rdtsc() - t_s));
else {
thread->rpf_arg = kmalloc(sizeof(struct ikc_scd_packet),
IHK_MC_AP_NOWAIT);
memcpy(thread->rpf_arg, packet,
sizeof(struct ikc_scd_packet));
thread->rpf_backlog = remote_page_fault;
sched_wakeup_thread(thread, PS_INTERRUPTIBLE);
}
#endif // PROFILE_ENABLE
thread_unlock(thread);
out_remote_pf:
pckt.msg = SCD_MSG_REMOTE_PAGE_FAULT_ANSWER;
pckt.ref = packet->ref;
pckt.arg = packet->arg;
pckt.reply = packet->reply;
pckt.pid = packet->pid;
syscall_channel_send(resp_channel, &pckt);
break;
case SCD_MSG_SEND_SIGNAL: