On Tue, 26 Jun 2012, Glauber Costa wrote: > > Nope, have you checked the output of /sys/kernel/slab/.../order when > > running slub? On my workstation 127 out of 316 caches have order-2 or > > higher by default. > > > > Well, this is still on the side of my argument, since this is still a majority > of them being low ordered. Ok, so what happens if I pass slub_min_order=2 on the command line? We never retry? > The code here does not necessarily have to retry - > if I understand it correctly - we just retry for very small allocations > because that is where our likelihood of succeeding is. > Well, the comment for NR_PAGES_TO_RETRY says /* * We need a number that is small enough to be likely to have been * reclaimed even under pressure, but not too big to trigger unnecessary * retries */ and mmzone.h says /* * PAGE_ALLOC_COSTLY_ORDER is the order at which allocations are deemed * costly to service. That is between allocation orders which should * coalesce naturally under reasonable reclaim pressure and those which * will not. */ #define PAGE_ALLOC_COSTLY_ORDER 3 so I'm trying to reconcile which one is correct. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>