On Wed, 24 Feb 2010 15:57:31 -0500 Rik van Riel <riel@xxxxxxxxxx> wrote: > On 02/24/2010 03:52 PM, Andrew Morton wrote: > > On Wed, 24 Feb 2010 15:28:44 -0500 Rik van Riel<riel@xxxxxxxxxx> wrote: > > > >>> Generally it seems like a bad idea to do this sort of thing > >>> asynchronously. Because it reduces repeatability across runs and > >>> across machines - system behaviour becomes more dependent on the size > >>> of the machine and the amount of activity in unrelated jobs? > >> > >> Isn't system performance already dependent on the size of > >> the machine and the amount of activity in unrelated jobs? > > > > I said "repeatability". > > > >> Using hugepages is a performance enhancement only and > >> otherwise transparent to userspace. > > > > And it's bad that a job run will take a varying amount of CPU time due > > to unrelated activity. Yes, that can already happen, but it's > > undesirable and it's undesirable to worsen things. > > > > If this work could be done synchronously then runtimes become more > > consistent, which is a good thing. > > Only if it means run times become shorter... > That of course would be a problem to be traded off against the advantage. One would need to quantify these things to make that call. I asked a question and all I'm getting in reply is flippancy and unsubstantiated assertions. It may have been a bad question, but they're certainly bad answers :( -- 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>