[Xen-devel] [PATCH 3/3] libxl: drop virDomainObj lock when destroying a domain

[Jim Fehlig <jfehlig@xxxxxxxx>]

A destroy operation can take considerable time on large memory
domains due to scrubbing the domain' memory.  The operation is
running in the context of a job, so unlocking the domain and
allowing query operations is safe.

Signed-off-by: Jim Fehlig <jfehlig@xxxxxxxx>
---
 src/libxl/libxl_domain.c | 4 ++++
 src/libxl/libxl_driver.c | 5 ++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/libxl/libxl_domain.c b/src/libxl/libxl_domain.c
index e240eae..aef0157 100644
--- a/src/libxl/libxl_domain.c
+++ b/src/libxl/libxl_domain.c
@@ -435,7 +435,9 @@ libxlDomainShutdownThread(void *opaque)
         libxlDomainEventQueue(driver, dom_event);
         dom_event = NULL;
     }
+    virObjectUnlock(vm);
     libxl_domain_destroy(cfg->ctx, vm->def->id, NULL);
+    virObjectLock(vm);
     libxlDomainCleanup(driver, vm, reason);
     if (!vm->persistent)
         virDomainObjListRemove(driver->domains, vm);
@@ -447,7 +449,9 @@ libxlDomainShutdownThread(void *opaque)
         libxlDomainEventQueue(driver, dom_event);
         dom_event = NULL;
     }
+    virObjectUnlock(vm);
     libxl_domain_destroy(cfg->ctx, vm->def->id, NULL);
+    virObjectLock(vm);
     libxlDomainCleanup(driver, vm, VIR_DOMAIN_SHUTOFF_SHUTDOWN);
     if (libxlDomainStart(driver, vm, false, -1) < 0) {
         virErrorPtr err = virGetLastError();
diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index a1977c2..21e20bb 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -1250,7 +1250,10 @@ libxlDomainDestroyFlags(virDomainPtr dom,
     event = virDomainEventLifecycleNewFromObj(vm, VIR_DOMAIN_EVENT_STOPPED,
                                      VIR_DOMAIN_EVENT_STOPPED_DESTROYED);
 
-    if (libxl_domain_destroy(cfg->ctx, vm->def->id, NULL) < 0) {
+    virObjectUnlock(vm);
+    ret = libxl_domain_destroy(cfg->ctx, vm->def->id, NULL);
+    virObjectLock(vm);
+    if (ret < 0) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("Failed to destroy domain '%d'"), vm->def->id);
         goto endjob;
-- 
1.8.4.5


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