Rik van Riel wrote: > On large memory systems, the VM can spend way too much time scanning > through pages that it cannot (or should not) evict from memory. Not > only does it use up CPU time, but it also provokes lock contention > and can leave large systems under memory presure in a catatonic state. >
Hi, Rik, I remember you mentioning that by large memory systems you mean systems with at-least 128GB, does this definition still hold? > This patch series improves VM scalability by: > > 1) making the locking a little more scalable > > 2) putting filesystem backed, swap backed and non-reclaimable pages > onto their own LRUs, so the system only scans the pages that it > can/should evict from memory > > 3) switching to SEQ replacement for the anonymous LRUs, so the > number of pages that need to be scanned when the system > starts swapping is bound to a reasonable number > > The noreclaim patches come verbatim from Lee Schermerhorn and > Nick Piggin. I have not taken a detailed look at them yet and > all I have done is fix the rejects against the latest -mm kernel. > Is there a consolidate patch available, it makes it easier to test. > I am posting this series now because I would like to get more > feedback, while I am studying and improving the noreclaim patches > myself. > What kind of tests show the problem? I'll try and review and test the code. -- Warm Regards, Balbir Singh Linux Technology Center IBM, ISTL -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/