Log a message when the kernel event queue overflows and events are dropped.
After 10 messages logging stops to avoid flooding the logs if the condition
is persistent.
---
src/evdev.c | 11 +++++++++++
src/evdev.h | 4 ++++
2 files changed, 15 insertions(+)
diff --git a/src/evdev.c b/src/evdev.c
index 1b4ce10..9026f5c 100644
--- a/src/evdev.c
+++ b/src/evdev.c
@@ -924,6 +924,17 @@ evdev_device_dispatch(void *data)
rc = libevdev_next_event(device->evdev,
LIBEVDEV_READ_FLAG_NORMAL, &ev);
if (rc == LIBEVDEV_READ_STATUS_SYNC) {
+ if (device->syn_drops_received < 10) {
+ device->syn_drops_received++;
+ log_info(libinput, "SYN_DROPPED event from "
+ "\"%s\" - some input events have "
+ "been lost.\n", device->devname);
+ if (device->syn_drops_received == 10)
+ log_info(libinput, "No longer logging "
+ "SYN_DROPPED events for "
+ "\"%s\"\n", device->devname);
+ }
+
/* send one more sync event so we handle all
currently pending events before we sync up
to the current state */
diff --git a/src/evdev.h b/src/evdev.h
index c0d6577..9e84623 100644
--- a/src/evdev.h
+++ b/src/evdev.h
@@ -135,6 +135,10 @@ struct evdev_device {
/* Checks if buttons are down and commits the setting */
void (*change_to_left_handed)(struct evdev_device *device);
} buttons;
+
+ /* The number of times libevdev processes a SYN_DROPPED, so we can
+ * stop logging them to avoid flooding the logs. */
+ int syn_drops_received;
};
#define EVDEV_UNHANDLED_DEVICE ((struct evdev_device *) 1)
--
2.1.1
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