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migration: Wait for blocking IO 

We have three conditions here:
- channel fails -> error
- we have to quit: we close the channel and reads fails
- normal read that success, we are in bussiness

So forget the complications of waiting in a semaphore.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Juan Quintela 2018-04-18 00:38:17 +02:00
parent 8b2db7f5fd
commit 4d22c148c9
1 changed files with 0 additions and 13 deletions
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13
migration/ram.c
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@ -602,8 +602,6 @@ typedef struct {
bool running;
/* should this thread finish */
bool quit;
/* thread has work to do */
bool pending_job;
/* array of pages to receive */
MultiFDPages_t *pages;
/* packet allocated len */
@ -1199,14 +1197,6 @@ static void multifd_recv_sync_main(void)
for (i = 0; i < migrate_multifd_channels(); i++) {
MultiFDRecvParams *p = &multifd_recv_state->params[i];
trace_multifd_recv_sync_main_signal(p->id);
qemu_mutex_lock(&p->mutex);
p->pending_job = true;
qemu_mutex_unlock(&p->mutex);
}
for (i = 0; i < migrate_multifd_channels(); i++) {
MultiFDRecvParams *p = &multifd_recv_state->params[i];
trace_multifd_recv_sync_main_wait(p->id);
qemu_sem_wait(&multifd_recv_state->sem_sync);
qemu_mutex_lock(&p->mutex);
@ -1219,7 +1209,6 @@ static void multifd_recv_sync_main(void)
MultiFDRecvParams *p = &multifd_recv_state->params[i];
trace_multifd_recv_sync_main_signal(p->id);
qemu_sem_post(&p->sem_sync);
}
trace_multifd_recv_sync_main(multifd_recv_state->packet_num);
@ -1256,7 +1245,6 @@ static void *multifd_recv_thread(void *opaque)
used = p->pages->used;
flags = p->flags;
trace_multifd_recv(p->id, p->packet_num, used, flags);
p->pending_job = false;
p->num_packets++;
p->num_pages += used;
qemu_mutex_unlock(&p->mutex);
@ -1306,7 +1294,6 @@ int multifd_load_setup(void)
qemu_sem_init(&p->sem, 0);
qemu_sem_init(&p->sem_sync, 0);
p->quit = false;
p->pending_job = false;
p->id = i;
p->pages = multifd_pages_init(page_count);
p->packet_len = sizeof(MultiFDPacket_t)