Yeah that was clear enough. Thanks a lot. Your code is of great help. Regards Sahil
On 31 March 2015 at 19:45, Elazar Leibovich <[email protected]> wrote: > I wanted to ensure the user always see contiguous array of data from > the ring buffer. > > The last piece of data, say "abcde" could wrap around in the ring > buffer and appear like: > > [de... ...abc] > > I wanted the user to see a contigious array of the form [abcde]. > > So in the case I'm having input that wrap around, I'll simply copy it > to the first buffer > > [wrap_buffer][de.. ...abc] > would become > [ abc][de... ...abc] > > And then I'll the user pointer to the leftmost "a", and he'll see > "abcde" without knowing he's handling a ring buffer. > > Let me know if I was clear enough. > > On Tue, Mar 31, 2015 at 2:18 PM, sahil aggarwal <[email protected]> wrote: >> >> Hi Elazar >> >> Can you help me understand why you have used >> mmap_pages->wrap_base.? And, instead of allocating >> (2^n)+1 pages you allocate (2^n)+2 pages, why so.? >> wrap_base points to (2^n)+2 pages and base points to >> (2^n)+1 pages, what is use of wrap_base.? I tried reading >> perf source too, there it seems they use (2^n)+1 pages only. >> >> >> Thanks >> Regards -- To unsubscribe from this list: send the line "unsubscribe linux-perf-users" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
