On Fri 17-06-16 21:13:12, zhongjiang wrote: > From: zhong jiang <zhongjiang@xxxxxxxxxx> > > huge_pmd_share accounts the number of pmds incorrectly when it races > with a parallel pud instantiation. vma_interval_tree_foreach will > increase the counter but then has to recheck the pud with the pte lock > held and the back off path should drop the increment. The previous > code would lead to an elevated pmd count which shouldn't be very > harmful (check_mm() might complain and oom_badness() might be marginally > confused) but this is worth fixing. Kirill has posted a patch which is imho better [1] [1] http://lkml.kernel.org/r/20160617122506.GC6534@xxxxxxxxxxxxxxxxxx -- Michal Hocko SUSE Labs -- 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>