On Tue, Oct 31, 2023 at 5:34 AM Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> wrote: > > Hello Ghanshyam, > > CC'ing the linux-media mailing list, to let other developers chime in as > well. > > On Sat, Oct 28, 2023 at 04:07:03PM +0530, Ghanshyam Agrawal wrote: > > Hello Laurent, > > > > Line 90 in file "drivers/media/usb/uvc/uvcvideo.h" in linux_mainline tree > > states > > > > /* > > * TODO: Put the most frequently accessed fields at the beginning of > > * structures to maximize cache efficiency. > > */ > > > > I am working on this todo item. Can you please guide me regarding > > > > 1. How can I find the number of accesses of each of the fields? > > By reading through the code :-) It may be possible to instrument that, > but I have no idea how. > > > 2. How can I find out the cache efficiency? > > Do you know how caches work ? > > > 3. When we say cache, which cache are we talking about? > > The CPU caches, any level. > > -- > Regards, > > Laurent Pinchart Hello Laurent, Thanks for your email. I will read the code and figure out which fields are accessed more frequently. I do have an understanding of the caching mechanism; and as you mentioned "cpu caches", I will find out the efficiency accordingly. Thanks again. I appreciate your response. Regards, Ghanshyam Agrawal
