On Thu, May 12, 2011 at 01:03:05PM -0500, Christoph Lameter wrote: > On Thu, 12 May 2011, Andrea Arcangeli wrote: > > > even order 3 is causing troubles (which doesn't immediately make lumpy > > activated, it only activates when priority is < DEF_PRIORITY-2, so > > after 2 loops failing to reclaim nr_to_reclaim pages), imagine what > > That is a significant change for SLUB with the merge of the compaction > code. Even before compaction was posted, I had to shut off lumpy reclaim or it'd hang all the time with frequent order 9 allocations. Maybe lumpy was better before, maybe lumpy "improved" its reliability recently, but definitely it wasn't performing well. That definitely applies to >=2.6.32 (I had to nuke lumpy from it, and only keep compaction enabled, pretty much like upstream with COMPACTION=y). I think I never tried earlier lumpy code than 2.6.32, maybe it was less aggressive back then, I don't exclude it but I thought the whole notion of lumpy was to takedown everything in the way, which usually leads to process hanging in swapins or pageins for frequent used memory. -- 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>