On Wed, Jul 23, 2014 at 08:16:58AM -0400, Mikulas Patocka wrote: > So, it means that you do not use device mapper at all. So, why are you > trying to change memory allocation in device mapper? So the *test* they run is asking device-mapper to briefly reserve a 64KB buffer when there is no data to report: The answer is not to run that pointless test:) And if a single 64KB allocation really is a big deal, then patch 'vold' in userspace so it doesn't ask for 64KB when it clearly doesn't need it! + int Devmapper::dumpState(SocketClient *c) { + char *buffer = (char *) malloc(1024 * 64); The code has just #define DEVMAPPER_BUFFER_SIZE 4096 for all the other dm ioctls it issues. Only use a larger value when it is needed i.e. if DM_BUFFER_FULL_FLAG gets set. Alasdair -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel