Re: [PATCH 2/2] LXC: use lxcDomainSetMemoryFlags to do lxcDomainSetMaxMemory's work

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On 16.07.2014 11:51, Chen Hanxiao wrote:
Signed-off-by: Chen Hanxiao <chenhanxiao@xxxxxxxxxxxxxx>
---
  src/lxc/lxc_driver.c | 36 +++++-------------------------------
  1 file changed, 5 insertions(+), 31 deletions(-)

diff --git a/src/lxc/lxc_driver.c b/src/lxc/lxc_driver.c
index be6ee19..9f974eb 100644
--- a/src/lxc/lxc_driver.c
+++ b/src/lxc/lxc_driver.c
@@ -680,37 +680,6 @@ lxcDomainGetMaxMemory(virDomainPtr dom)
      return ret;
  }

-static int lxcDomainSetMaxMemory(virDomainPtr dom, unsigned long newmax)
-{
-    virDomainObjPtr vm;
-    int ret = -1;
-
-    if (!(vm = lxcDomObjFromDomain(dom)))
-        goto cleanup;
-
-    if (virDomainSetMaxMemoryEnsureACL(dom->conn, vm->def) < 0)
-        goto cleanup;
-
-    if (newmax < vm->def->mem.cur_balloon) {
-        if (!virDomainObjIsActive(vm)) {
-            vm->def->mem.cur_balloon = newmax;
-        } else {
-            virReportError(VIR_ERR_OPERATION_INVALID, "%s",
-                           _("Cannot set max memory lower than current"
-                             " memory for an active domain"));
-            goto cleanup;
-        }
-    }
-
-    vm->def->mem.max_balloon = newmax;
-    ret = 0;
-
- cleanup:
-    if (vm)
-        virObjectUnlock(vm);
-    return ret;
-}
-

A-ha! This is what I was looking for in 1/2. Okay, but I'd rather note this fact in 1/2 commit message to make it more obvious.

  static int lxcDomainSetMemoryFlags(virDomainPtr dom, unsigned long newmem,
                                     unsigned int flags)
  {
@@ -809,6 +778,11 @@ static int lxcDomainSetMemory(virDomainPtr dom, unsigned long newmem)
      return lxcDomainSetMemoryFlags(dom, newmem, VIR_DOMAIN_AFFECT_LIVE);
  }

+static int lxcDomainSetMaxMemory(virDomainPtr dom, unsigned long memory)
+{
+    return lxcDomainSetMemoryFlags(dom, memory, VIR_DOMAIN_MEM_MAXIMUM);
+}
+

So previously, calling virDomainSetMaxMemory() on an inactive LXC domain would succeed. Now, after the change, due to problem with _CURRENT, _LIVE and _CONFIG this will basically return success, but without any effect on the domain config. And that's wrong.


  static int
  lxcDomainSetMemoryParameters(virDomainPtr dom,
                               virTypedParameterPtr params,


Moreover, I think these two patches can be joined into one.

Michal

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