[libvirt PATCH 1/2] nodedev: refactor mdevctl thread functions
Factor out a new scheduleMdevctlUpdate() function so that we can re-use
it from other places. Now that other events can make it necessary to
re-query mdevctl for mdev updates, this function will be useful for
coalescing multiple updates in quick succession into a single mdevctl
query.
Also rename a couple functions. The names weren't very descriptive of
their behavior. For example, the old scheduleMdevctlHandler() function
didn't actually schedule anything, it just started a thread. So rename
it to free up the 'schedule' name for the above refactored function.
Signed-off-by: Jonathon Jongsma <jjongsma(a)redhat.com>
---
src/node_device/node_device_udev.c | 37 ++++++++++++++++++++----------
1 file changed, 25 insertions(+), 12 deletions(-)
diff --git a/src/node_device/node_device_udev.c b/src/node_device/node_device_udev.c
index fce4212728..9ba550dbc1 100644
--- a/src/node_device/node_device_udev.c
+++ b/src/node_device/node_device_udev.c
@@ -2075,7 +2075,7 @@ udevPCITranslateInit(bool privileged G_GNUC_UNUSED)
static void
-mdevctlHandlerThread(void *opaque G_GNUC_UNUSED)
+mdevctlUpdateThreadFunc(void *opaque G_GNUC_UNUSED)
{
udevEventData *priv = driver->privateData;
VIR_LOCK_GUARD lock = virLockGuardLock(&priv->mdevctlLock);
@@ -2085,8 +2085,9 @@ mdevctlHandlerThread(void *opaque G_GNUC_UNUSED)
}
+
static void
-scheduleMdevctlHandler(int timer G_GNUC_UNUSED, void *opaque)
+launchMdevctlUpdateThread(int timer G_GNUC_UNUSED, void *opaque)
{
udevEventData *priv = opaque;
virThread thread;
@@ -2096,7 +2097,7 @@ scheduleMdevctlHandler(int timer G_GNUC_UNUSED, void *opaque)
priv->mdevctlTimeout = -1;
}
- if (virThreadCreateFull(&thread, false, mdevctlHandlerThread,
+ if (virThreadCreateFull(&thread, false, mdevctlUpdateThreadFunc,
"mdevctl-thread", false, NULL) < 0) {
virReportSystemError(errno, "%s",
_("failed to create mdevctl thread"));
@@ -2192,6 +2193,26 @@ mdevctlEnableMonitor(udevEventData *priv)
}
+/* Schedules an mdevctl update for 100ms in the future, canceling any existing
+ * timeout that may have been set. In this way, multiple update requests in
+ * quick succession can be collapsed into a single update. if @force is true,
+ * an update thread will be spawned immediately. */
+static void
+scheduleMdevctlUpdate(udevEventData *data,
+ bool force)
+{
+ if (!force) {
+ if (data->mdevctlTimeout > 0)
+ virEventRemoveTimeout(data->mdevctlTimeout);
+ data->mdevctlTimeout = virEventAddTimeout(100, launchMdevctlUpdateThread,
+ data, NULL);
+ return;
+ }
+
+ launchMdevctlUpdateThread(-1, data);
+}
+
+
static void
mdevctlEventHandleCallback(GFileMonitor *monitor G_GNUC_UNUSED,
GFile *file,
@@ -2222,15 +2243,7 @@ mdevctlEventHandleCallback(GFileMonitor *monitor G_GNUC_UNUSED,
* configuration change, try to coalesce these changes by waiting for the
* CHANGES_DONE_HINT event. As a fallback, add a timeout to trigger the
* signal if that event never comes */
- if (event_type != G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT) {
- if (priv->mdevctlTimeout > 0)
- virEventRemoveTimeout(priv->mdevctlTimeout);
- priv->mdevctlTimeout = virEventAddTimeout(100, scheduleMdevctlHandler,
- priv, NULL);
- return;
- }
-
- scheduleMdevctlHandler(-1, priv);
+ scheduleMdevctlUpdate(priv, (event_type == G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT));
}
--
2.41.0