Commit 636ed5fc authored Mar 07, 2018 by Daniel Mentz

ueventd: Increase uevent buffer size to 2MB

Let's increase the receive buffer size for the NETLINK_KOBJECT_UEVENT
socket to 2MB. Unless a large number of uevents queue up, that memory is
not allocated anyways. The receive buffer size serves only as an upper
limit for the total amount of memory consumed by all skbs queued to a
specific socket.

We experienced situations where ueventd got blocked for multiple seconds
while writing to /dev/kmsg, and the receive buffer overflowed in the
meantime.

Test: compile
Bug: 72648767
Change-Id: Ice6d7b9c5ed9c83efbad6111086ce95ac6432561

parent 6fe59afe

init/uevent_listener.cpp

+2 −2

Original line number	Diff line number	Diff line
		@@ -83,8 +83,8 @@ static void ParseEvent(const char* msg, Uevent* uevent) {
		}

		UeventListener::UeventListener() {
		// is 256K enough? udev uses 16MB!
		device_fd_.reset(uevent_open_socket(256 * 1024, true));
		// is 2MB enough? udev uses 128MB!
		device_fd_.reset(uevent_open_socket(2 * 1024 * 1024, true));
		if (device_fd_ == -1) {
		LOG(FATAL) << "Could not open uevent socket";
		}