Hello, On Mon, Oct 08, 2012 at 05:41:14PM +0200, Rabin Vincent wrote: > It appears that when CMA is enabled, the zone watermarks are not properly > respected, leading to for example GFP_NOWAIT allocations getting access to the > high pools. > > I ran the following test code which simply allocates pages with GFP_NOWAIT > until it fails, and then tries GFP_ATOMIC. Without CMA, the GFP_ATOMIC > allocation succeeds, with CMA, it fails too. Good spot. By wrong zone_watermark_check, it can consume reserved memory pool. > > Logs attached (includes my patch which prints the migration type in the failure > message http://marc.info/?l=linux-mm&m=134971041701306&w=2), taken on 3.6 > kernel. > Fortunately, recently, Bart sent a patch about that. http://marc.info/?l=linux-mm&m=134763299016693&w=2 Could you test above patches in your kernel? You have to apply [2/4], [3/4], [4/4] and don't need [1/4]. Thanks. -- Kind regards, Minchan Kim -- 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>