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migration: Make global sem_sync semaphore by channel 

This makes easy to debug things because when you want for all threads
to arrive at that semaphore, you know which one your are waiting for.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-Id: <20190814020218.1868-3-quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Juan Quintela 2019-08-14 04:02:14 +02:00 committed by Dr. David Alan Gilbert
parent 5558c91ae8
commit 18cdcea371
1 changed files with 7 additions and 7 deletions
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14
migration/ram.c
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@ -661,6 +661,8 @@ typedef struct {
uint64_t num_packets;
/* pages sent through this channel */
uint64_t num_pages;
/* syncs main thread and channels */
QemuSemaphore sem_sync;
} MultiFDSendParams;
typedef struct {
@ -896,8 +898,6 @@ struct {
MultiFDSendParams *params;
/* array of pages to sent */
MultiFDPages_t *pages;
/* syncs main thread and channels */
QemuSemaphore sem_sync;
/* global number of generated multifd packets */
uint64_t packet_num;
/* send channels ready */
@ -1039,6 +1039,7 @@ void multifd_save_cleanup(void)
p->c = NULL;
qemu_mutex_destroy(&p->mutex);
qemu_sem_destroy(&p->sem);
qemu_sem_destroy(&p->sem_sync);
g_free(p->name);
p->name = NULL;
multifd_pages_clear(p->pages);
@ -1048,7 +1049,6 @@ void multifd_save_cleanup(void)
p->packet = NULL;
}
qemu_sem_destroy(&multifd_send_state->channels_ready);
qemu_sem_destroy(&multifd_send_state->sem_sync);
g_free(multifd_send_state->params);
multifd_send_state->params = NULL;
multifd_pages_clear(multifd_send_state->pages);
@ -1096,7 +1096,7 @@ static void multifd_send_sync_main(RAMState *rs)
MultiFDSendParams *p = &multifd_send_state->params[i];
trace_multifd_send_sync_main_wait(p->id);
qemu_sem_wait(&multifd_send_state->sem_sync);
qemu_sem_wait(&p->sem_sync);
}
trace_multifd_send_sync_main(multifd_send_state->packet_num);
}
@ -1156,7 +1156,7 @@ static void *multifd_send_thread(void *opaque)
qemu_mutex_unlock(&p->mutex);
if (flags & MULTIFD_FLAG_SYNC) {
qemu_sem_post(&multifd_send_state->sem_sync);
qemu_sem_post(&p->sem_sync);
}
qemu_sem_post(&multifd_send_state->channels_ready);
} else if (p->quit) {
@ -1179,7 +1179,7 @@ out:
*/
if (ret != 0) {
if (flags & MULTIFD_FLAG_SYNC) {
qemu_sem_post(&multifd_send_state->sem_sync);
qemu_sem_post(&p->sem_sync);
}
qemu_sem_post(&multifd_send_state->channels_ready);
}
@ -1225,7 +1225,6 @@ int multifd_save_setup(void)
multifd_send_state = g_malloc0(sizeof(*multifd_send_state));
multifd_send_state->params = g_new0(MultiFDSendParams, thread_count);
multifd_send_state->pages = multifd_pages_init(page_count);
qemu_sem_init(&multifd_send_state->sem_sync, 0);
qemu_sem_init(&multifd_send_state->channels_ready, 0);
for (i = 0; i < thread_count; i++) {
@ -1233,6 +1232,7 @@ int multifd_save_setup(void)
qemu_mutex_init(&p->mutex);
qemu_sem_init(&p->sem, 0);
qemu_sem_init(&p->sem_sync, 0);
p->quit = false;
p->pending_job = 0;
p->id = i;