> On 06/29/2010 08:25 PM, Ying Han wrote: > > apologies if you got this email twice, the first emails seems not > > getting through :( > > > > This is the discussion we would like to have on the upcoming Linux VM > > summit. > > > > Problem: > > Google runs large scale of machines and each machine runs Linux. We try > > to achieve higher utilization by better bin-packing of jobs on existing > > systems and for this we depend on having accurate resource usage > > estimation. Linux VM subsystem is designed in a way that it tries to > > allocate every single page available by filling up page cache pages. > > Some of the pages might be touched once and never touched again. Pageout > > deamon(kswapd) only evicts pages under memory pressure, so pages which > > are actually stale will end up taking memory space. It would be nice to > > have a way to measure the portion of working set for each process > > periodically. A user-land resource management program can trigger > > reclaim of the stale pages making room for packing more jobs any time. > > Something like this functionality could also be useful for > virtualization, kicking off garbage collection in JVMs and > other runtimes, as well as resizing other workloads that > cache data... > > I would like to discuss this topic so we can figure out > the kind of functionality needed to achieve what everybody > wants. Yup. very interesting. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>