On Fri, Jun 8, 2012 at 9:58 AM, Anton Vorontsov <anton.vorontsov@xxxxxxxxxx> wrote: > If you're saying that we should set up a timer in the userland and > constantly read /proc/vmstat, then we will cause CPU wake up > every 100ms, which is not acceptable. Well, we can try to introduce > deferrable timers for the userspace. But then it would still add > a lot more overhead for our task, as this solution adds other two > context switches to read and parse /proc/vmstat. I guess this is > not a show-stopper though, so we can discuss this. > > Leonid, Pekka, what do you think about the idea? That's exactly the kind of half-assed ABI that lead to people inventing out-of-tree lowmem notifiers in the first place. I'd be more interested to know what people think of Minchan's that gets rid of vmstat sampling. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>