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authorPeter Xu <peterx@redhat.com>2018-05-02 18:47:21 +0800
committerJuan Quintela <quintela@redhat.com>2018-05-15 20:24:27 +0200
commit14b1742eaaad1148c5b421eea0ae7e74d823e630 (patch)
tree8e6225ee45763dea821118423a847042c6f22cec /migration
parentb411b844fb2e038c6ba92fd50fed3213a27c6445 (diff)
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migration: allow src return path to pause
Let the thread pause for network issues. Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <20180502104740.12123-6-peterx@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
Diffstat (limited to 'migration')
-rw-r--r--migration/migration.c35
-rw-r--r--migration/migration.h1
-rw-r--r--migration/trace-events2
3 files changed, 36 insertions, 2 deletions
diff --git a/migration/migration.c b/migration/migration.c
index 4a7c02f..f9c58d2 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1779,6 +1779,18 @@ static void migrate_handle_rp_req_pages(MigrationState *ms, const char* rbname,
}
}
+/* Return true to retry, false to quit */
+static bool postcopy_pause_return_path_thread(MigrationState *s)
+{
+ trace_postcopy_pause_return_path();
+
+ qemu_sem_wait(&s->postcopy_pause_rp_sem);
+
+ trace_postcopy_pause_return_path_continued();
+
+ return true;
+}
+
/*
* Handles messages sent on the return path towards the source VM
*
@@ -1795,6 +1807,8 @@ static void *source_return_path_thread(void *opaque)
int res;
trace_source_return_path_thread_entry();
+
+retry:
while (!ms->rp_state.error && !qemu_file_get_error(rp) &&
migration_is_setup_or_active(ms->state)) {
trace_source_return_path_thread_loop_top();
@@ -1886,13 +1900,28 @@ static void *source_return_path_thread(void *opaque)
break;
}
}
- if (qemu_file_get_error(rp)) {
+
+out:
+ res = qemu_file_get_error(rp);
+ if (res) {
+ if (res == -EIO) {
+ /*
+ * Maybe there is something we can do: it looks like a
+ * network down issue, and we pause for a recovery.
+ */
+ if (postcopy_pause_return_path_thread(ms)) {
+ /* Reload rp, reset the rest */
+ rp = ms->rp_state.from_dst_file;
+ ms->rp_state.error = false;
+ goto retry;
+ }
+ }
+
trace_source_return_path_thread_bad_end();
mark_source_rp_bad(ms);
}
trace_source_return_path_thread_end();
-out:
ms->rp_state.from_dst_file = NULL;
qemu_fclose(rp);
return NULL;
@@ -2700,6 +2729,7 @@ static void migration_instance_finalize(Object *obj)
g_free(params->tls_creds);
qemu_sem_destroy(&ms->pause_sem);
qemu_sem_destroy(&ms->postcopy_pause_sem);
+ qemu_sem_destroy(&ms->postcopy_pause_rp_sem);
error_free(ms->error);
}
@@ -2731,6 +2761,7 @@ static void migration_instance_init(Object *obj)
params->has_xbzrle_cache_size = true;
qemu_sem_init(&ms->postcopy_pause_sem, 0);
+ qemu_sem_init(&ms->postcopy_pause_rp_sem, 0);
}
/*
diff --git a/migration/migration.h b/migration/migration.h
index 0ccdcb8..32fd50e 100644
--- a/migration/migration.h
+++ b/migration/migration.h
@@ -200,6 +200,7 @@ struct MigrationState
/* Needed by postcopy-pause state */
QemuSemaphore postcopy_pause_sem;
+ QemuSemaphore postcopy_pause_rp_sem;
};
void migrate_set_state(int *state, int old_state, int new_state);
diff --git a/migration/trace-events b/migration/trace-events
index e23ec01..cd971bf 100644
--- a/migration/trace-events
+++ b/migration/trace-events
@@ -99,6 +99,8 @@ migration_thread_setup_complete(void) ""
open_return_path_on_source(void) ""
open_return_path_on_source_continue(void) ""
postcopy_start(void) ""
+postcopy_pause_return_path(void) ""
+postcopy_pause_return_path_continued(void) ""
postcopy_pause_continued(void) ""
postcopy_pause_incoming(void) ""
postcopy_pause_incoming_continued(void) ""