On 01/17/2012 01:51 PM, Pekka Enberg wrote:
Hello, Ok, so here's a proof of concept patch that implements sample-base per-process free threshold VM event watching using perf-like syscall ABI. I'd really like to see something like this that's much more extensible and clean than the /dev based ABIs that people have proposed so far.
Looks like a nice extensible interface to me. The only thing is, I expect we will not want to wake up processes most of the time, when there is no memory pressure, because that would just waste battery power and/or cpu time that could be used for something else. The desire to avoid such wakeups makes it harder to wake up processes at arbitrary points set by the API. Another issue is that we might be running two programs on the system, each with a different threshold for "lets free some of my cache". Say one program sets the threshold at 20% free/cache memory, the other program at 10%. We could end up with the first process continually throwing away its caches, while the second process never gives its unused memory back to the kernel. I am not sure what the right thing to do would be... -- All rights reversed -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>