On Thu, Nov 17, 2011 at 04:40:54PM -0500, Alan Stern wrote: > The following series of three patches changes the way usbfs limits > memory usage. Currently each bulk (and interrupt, but that doesn't > matter so much) URB is restricted to a relatively small transfer > buffer. In addition to being highly arbitrary, this limit does nothing > to prevent users from allocating all of the kernel's DMA-able memory by > submitting many small URBs. > > The new system removes the limits on individual URBs. If sufficient > contiguous kernel memory is available, the URB will be accepted. > Instead, we have a global limit on the total amount of memory that will > be used for usbfs buffers. This limit is controlled by a writable > module parameter, so that users can adjust it at runtime if they need > more space than the default allows. > > Testing of these patches has been fairly minimal, but I don't expect > any serious problems. The patches are organized as follows: > > 1/3 unifies the error pathways in the various URB-submission > routines, to make memory accounting simpler. > > 2/3 removes the transfer-buffer size limitation and installs > the global memory limit. > > 3/3 changes the global memory limit from a fixed constant to > a writable module parameter. Very nice, thanks for doing this, now queued up. greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
