On Fri, 15 Apr 2005, Oliver Neukum wrote: > Am Freitag, 15. April 2005 19:38 schrieb David Brownell: > > > IMHO the best way to reduce times is to move all memory > > > allocations into urb allocation. > > > > That's an approach I've thought about. Unfortunately it's costs an invasive > > API change: passing the device (or better yet, usb_host_endpoint) into > > the URB allocation. Though to clarify: that would affect allocation of > > TDs and any urb-private data, not the data buffers. Something like > > > > usb_urb_alloc(usb_host_endpoint *ep, // hook to HCD > > size_t maxbuf, // ... for prealloc of N TDs > > unsigned n_iso, > > unsigned gfp_flags); > > > > It is pretty straightforward a change. Auditing locking in all drivers is not. > Switching to tasklets would result in revisting locking in drivers.
Why would switching uhci-hcd over to a tasklet require any change in other drivers? Alan Stern ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
