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[Qemu-devel] [PATCH v12 03/21] migration: terminate_* can be called for
From: |
Juan Quintela |
Subject: |
[Qemu-devel] [PATCH v12 03/21] migration: terminate_* can be called for other threads |
Date: |
Wed, 25 Apr 2018 13:27:05 +0200 |
Once there, make count field to always be accessed with atomic
operations. To make blocking operations, we need to know that the
thread is running, so create a bool to indicate that.
Signed-off-by: Juan Quintela <address@hidden>
Reviewed-by: Daniel P. Berrangé <address@hidden>
--
Once here, s/terminate_multifd_*-threads/multifd_*_terminate_threads/
This is consistente with every other function
---
migration/ram.c | 44 ++++++++++++++++++++++++++++++--------------
1 file changed, 30 insertions(+), 14 deletions(-)
diff --git a/migration/ram.c b/migration/ram.c
index c3c330b0e0..c0ad6d8e9f 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -406,6 +406,7 @@ struct MultiFDSendParams {
QemuThread thread;
QemuSemaphore sem;
QemuMutex mutex;
+ bool running;
bool quit;
};
typedef struct MultiFDSendParams MultiFDSendParams;
@@ -416,7 +417,7 @@ struct {
int count;
} *multifd_send_state;
-static void terminate_multifd_send_threads(Error *err)
+static void multifd_send_terminate_threads(Error *err)
{
int i;
@@ -430,7 +431,7 @@ static void terminate_multifd_send_threads(Error *err)
}
}
- for (i = 0; i < multifd_send_state->count; i++) {
+ for (i = 0; i < migrate_multifd_channels(); i++) {
MultiFDSendParams *p = &multifd_send_state->params[i];
qemu_mutex_lock(&p->mutex);
@@ -448,11 +449,13 @@ int multifd_save_cleanup(Error **errp)
if (!migrate_use_multifd()) {
return 0;
}
- terminate_multifd_send_threads(NULL);
- for (i = 0; i < multifd_send_state->count; i++) {
+ multifd_send_terminate_threads(NULL);
+ for (i = 0; i < migrate_multifd_channels(); i++) {
MultiFDSendParams *p = &multifd_send_state->params[i];
- qemu_thread_join(&p->thread);
+ if (p->running) {
+ qemu_thread_join(&p->thread);
+ }
qemu_mutex_destroy(&p->mutex);
qemu_sem_destroy(&p->sem);
g_free(p->name);
@@ -479,6 +482,10 @@ static void *multifd_send_thread(void *opaque)
qemu_sem_wait(&p->sem);
}
+ qemu_mutex_lock(&p->mutex);
+ p->running = false;
+ qemu_mutex_unlock(&p->mutex);
+
return NULL;
}
@@ -493,7 +500,7 @@ int multifd_save_setup(void)
thread_count = migrate_multifd_channels();
multifd_send_state = g_malloc0(sizeof(*multifd_send_state));
multifd_send_state->params = g_new0(MultiFDSendParams, thread_count);
- multifd_send_state->count = 0;
+ atomic_set(&multifd_send_state->count, 0);
for (i = 0; i < thread_count; i++) {
MultiFDSendParams *p = &multifd_send_state->params[i];
@@ -502,10 +509,11 @@ int multifd_save_setup(void)
p->quit = false;
p->id = i;
p->name = g_strdup_printf("multifdsend_%d", i);
+ p->running = true;
qemu_thread_create(&p->thread, p->name, multifd_send_thread, p,
QEMU_THREAD_JOINABLE);
- multifd_send_state->count++;
+ atomic_inc(&multifd_send_state->count);
}
return 0;
}
@@ -516,6 +524,7 @@ struct MultiFDRecvParams {
QemuThread thread;
QemuSemaphore sem;
QemuMutex mutex;
+ bool running;
bool quit;
};
typedef struct MultiFDRecvParams MultiFDRecvParams;
@@ -526,7 +535,7 @@ struct {
int count;
} *multifd_recv_state;
-static void terminate_multifd_recv_threads(Error *err)
+static void multifd_recv_terminate_threads(Error *err)
{
int i;
@@ -540,7 +549,7 @@ static void terminate_multifd_recv_threads(Error *err)
}
}
- for (i = 0; i < multifd_recv_state->count; i++) {
+ for (i = 0; i < migrate_multifd_channels(); i++) {
MultiFDRecvParams *p = &multifd_recv_state->params[i];
qemu_mutex_lock(&p->mutex);
@@ -558,11 +567,13 @@ int multifd_load_cleanup(Error **errp)
if (!migrate_use_multifd()) {
return 0;
}
- terminate_multifd_recv_threads(NULL);
- for (i = 0; i < multifd_recv_state->count; i++) {
+ multifd_recv_terminate_threads(NULL);
+ for (i = 0; i < migrate_multifd_channels(); i++) {
MultiFDRecvParams *p = &multifd_recv_state->params[i];
- qemu_thread_join(&p->thread);
+ if (p->running) {
+ qemu_thread_join(&p->thread);
+ }
qemu_mutex_destroy(&p->mutex);
qemu_sem_destroy(&p->sem);
g_free(p->name);
@@ -590,6 +601,10 @@ static void *multifd_recv_thread(void *opaque)
qemu_sem_wait(&p->sem);
}
+ qemu_mutex_lock(&p->mutex);
+ p->running = false;
+ qemu_mutex_unlock(&p->mutex);
+
return NULL;
}
@@ -604,7 +619,7 @@ int multifd_load_setup(void)
thread_count = migrate_multifd_channels();
multifd_recv_state = g_malloc0(sizeof(*multifd_recv_state));
multifd_recv_state->params = g_new0(MultiFDRecvParams, thread_count);
- multifd_recv_state->count = 0;
+ atomic_set(&multifd_recv_state->count, 0);
for (i = 0; i < thread_count; i++) {
MultiFDRecvParams *p = &multifd_recv_state->params[i];
@@ -613,9 +628,10 @@ int multifd_load_setup(void)
p->quit = false;
p->id = i;
p->name = g_strdup_printf("multifdrecv_%d", i);
+ p->running = true;
qemu_thread_create(&p->thread, p->name, multifd_recv_thread, p,
QEMU_THREAD_JOINABLE);
- multifd_recv_state->count++;
+ atomic_inc(&multifd_recv_state->count);
}
return 0;
}
--
2.17.0
- [Qemu-devel] [PATCH v12 00/21] Multifd, Juan Quintela, 2018/04/25
- [Qemu-devel] [PATCH v12 01/21] migration: Set error state in case of error, Juan Quintela, 2018/04/25
- [Qemu-devel] [PATCH v12 02/21] migration: Introduce multifd_recv_new_channel(), Juan Quintela, 2018/04/25
- [Qemu-devel] [PATCH v12 03/21] migration: terminate_* can be called for other threads,
Juan Quintela <=
- [Qemu-devel] [PATCH v12 05/21] migration: Export functions to create send channels, Juan Quintela, 2018/04/25
- [Qemu-devel] [PATCH v12 04/21] migration: Be sure all recv channels are created, Juan Quintela, 2018/04/25
- [Qemu-devel] [PATCH v12 06/21] migration: Create multifd channels, Juan Quintela, 2018/04/25
- [Qemu-devel] [PATCH v12 07/21] migration: Delay start of migration main routines, Juan Quintela, 2018/04/25
- [Qemu-devel] [PATCH v12 08/21] migration: Transmit initial package through the multifd channels, Juan Quintela, 2018/04/25
- [Qemu-devel] [PATCH v12 09/21] migration: Define MultifdRecvParams sooner, Juan Quintela, 2018/04/25
- [Qemu-devel] [PATCH v12 10/21] migration: Create multipage support, Juan Quintela, 2018/04/25
- [Qemu-devel] [PATCH v12 11/21] migration: Create multifd packet, Juan Quintela, 2018/04/25