On Tue, Mar 29, 2011 at 12:05 PM, Andrea Arcangeli <aarcange@xxxxxxxxxx> wrote: > Hi Rik, Hugh and everyone, > > On Tue, Mar 29, 2011 at 11:35:09AM -0400, Rik van Riel wrote: >> On 03/29/2011 12:36 AM, James Bottomley wrote: >> > Hi All, >> > >> > Since LSF is less than a week away, the programme committee put together >> > a just in time preliminary agenda for LSF. As you can see there is >> > still plenty of empty space, which you can make suggestions >> >> There have been a few patches upstream by people for who >> page allocation latency is a concern. >> >> It may be worthwhile to have a short discussion on what >> we can do to keep page allocation (and direct reclaim?) >> latencies down to a minimum, reducing the slowdown that >> direct reclaim introduces on some workloads. > > I don't see the patches you refer to, but checking schedule we've a > slot with Mel&Minchan about "Reclaim, compaction and LRU > ordering". Compaction only applies to high order allocations and it > changes nothing to PAGE_SIZE allocations, but it surely has lower > latency than the older lumpy reclaim logic so overall it should be a > net improvement compared to what we had before. > > Should the latency issues be discussed in that track? > > The MM schedule has still a free slot 14-14:30 on Monday, I wonder if > there's interest on a "NUMA automatic migration and scheduling > awareness" topic or if it's still too vapourware for a real topic and > we should keep it for offtrack discussions, and maybe we should > reserve it for something more tangible with patches already floating > around. Comments welcome. In page reclaim, I would like to discuss on the magic "8" * high_wmark() in balance_pgdat(). I recently found the discussion on thread "too big min_free_kbytes", where I didn't find where we proved it is still a problem or not. This might not need reserve time slot, but something I want to learn more on. --Ying > > Thanks, > Andrea > > -- > 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/ . > Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ > Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a> > -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href