On Wed, 2010-09-29 at 16:11 +0100, Tony Poppleton wrote: > Hi, > > I have read that with each new kernel release, the Big Kernel Lock > (BKL) is gradually being removed from the core kernel code. > > Just out of interest, I was wondering if this has an impact on the RT patch? > > In particular, > - does the RT patch have any connection with the BKL? Yes. The RT patch has been addressing BKL for several years. > - presumably the BKL removal will reduce the average latency of the > unpatched kernel? Yes. > - is the BKL currently a source of considerable latency? Especially on SMP it can be. > - will the BKL removal make the RT patch considerably smaller/simpler? It will eliminate code from the RT patch. You would need to scan the latest patch yourself to ascertain how much, as this is WiP and I am not totally current. > - has the RT patch effectively been removing the BKL since day 1, or > does it just make the BKL a pre-emptible lock? > It has been making it preemptible since day 1. Sven -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
