On Tue, Nov 11, 2014 at 05:44:12PM -0800, Andrew Morton wrote: > On Wed, 12 Nov 2014 10:22:45 +0900 Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> wrote: > > > On Tue, Nov 11, 2014 at 05:02:43PM -0800, Andrew Morton wrote: > > > On Wed, 12 Nov 2014 00:54:01 +0000 Luke Dashjr <luke@xxxxxxxxxx> wrote: > > > > > > > On Wednesday, November 12, 2014 12:49:13 AM Andrew Morton wrote: > > > > > But anyway - Luke, please attach your .config to > > > > > https://bugzilla.kernel.org/show_bug.cgi?id=87891? > > > > > > > > Done: https://bugzilla.kernel.org/attachment.cgi?id=157381 > > > > > > > > > > OK, thanks. No CONFIG_HIGHMEM of course. I'm stumped. > > > > Hello, Andrew. > > > > I think that the cause is GFP_HIGHMEM. > > GFP_HIGHMEM is always defined regardless CONFIG_HIGHMEM. > > Please look at the do_huge_pmd_anonymous_page(). > > It calls alloc_hugepage_vma() and then alloc_pages_vma() is called > > with alloc_hugepage_gfpmask(). This gfpmask includes GFP_TRANSHUGE > > and then GFP_HIGHUSER_MOVABLE. > > OK. > > So where's the bug? I'm inclined to say that it's in ttm. It's taking I agree that. > a gfp_mask which means "this is the allocation attempt which we are > attempting to satisfy" and uses that for its own allocation. > > But ttm has no business using that gfp_mask for its own allocation > attempt. If anything it should use something like, err, > > GFP_KERNEL & ~__GFP_IO & ~__GFP_FS | __GFP_HIGH > > although as I mentioned earlier, it would be better to avoid allocation > altogether. Yes, avoiding would be the best. If not possible, introducing new common helper for changing shrinker control's gfp to valid allocation gfp is better than just open code. Thanks. > > Poor ttm guys - this is a bit of a trap we set for them. > > -- > 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> -- 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>