On 6/15/20 10:35 PM, Hugh Dickins wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=208085 reports that a > slightly overcommitted load, testing swap and zram along with i915, > splats and keeps on splatting, when it had better fail less noisily: > > gnome-shell: page allocation failure: order:0, > mode:0x400d0(__GFP_IO|__GFP_FS|__GFP_COMP|__GFP_RECLAIMABLE), > nodemask=(null),cpuset=/,mems_allowed=0 > CPU: 2 PID: 1155 Comm: gnome-shell Not tainted 5.7.0-1.fc33.x86_64 #1 > Call Trace: > dump_stack+0x64/0x88 > warn_alloc.cold+0x75/0xd9 > __alloc_pages_slowpath.constprop.0+0xcfa/0xd30 > __alloc_pages_nodemask+0x2df/0x320 > alloc_slab_page+0x195/0x310 > allocate_slab+0x3c5/0x440 > ___slab_alloc+0x40c/0x5f0 > __slab_alloc+0x1c/0x30 > kmem_cache_alloc+0x20e/0x220 > xas_nomem+0x28/0x70 > add_to_swap_cache+0x321/0x400 > __read_swap_cache_async+0x105/0x240 > swap_cluster_readahead+0x22c/0x2e0 > shmem_swapin+0x8e/0xc0 > shmem_swapin_page+0x196/0x740 > shmem_getpage_gfp+0x3a2/0xa60 > shmem_read_mapping_page_gfp+0x32/0x60 > shmem_get_pages+0x155/0x5e0 [i915] > __i915_gem_object_get_pages+0x68/0xa0 [i915] > i915_vma_pin+0x3fe/0x6c0 [i915] > eb_add_vma+0x10b/0x2c0 [i915] > i915_gem_do_execbuffer+0x704/0x3430 [i915] > i915_gem_execbuffer2_ioctl+0x1ea/0x3e0 [i915] > drm_ioctl_kernel+0x86/0xd0 [drm] > drm_ioctl+0x206/0x390 [drm] > ksys_ioctl+0x82/0xc0 > __x64_sys_ioctl+0x16/0x20 > do_syscall_64+0x5b/0xf0 > entry_SYSCALL_64_after_hwframe+0x44/0xa9 > > Reported on 5.7, but it goes back really to 3.1: when > shmem_read_mapping_page_gfp() was implemented for use by i915, and > allowed for __GFP_NORETRY and __GFP_NOWARN flags in most places, but > missed swapin's "& GFP_KERNEL" mask for page tree node allocation in > __read_swap_cache_async() - that was to mask off HIGHUSER_MOVABLE bits > from what page cache uses, but GFP_RECLAIM_MASK is now what's needed. > > Fixes: 68da9f055755 ("tmpfs: pass gfp to shmem_getpage_gfp") > Reported-by: Chris Murphy <lists@xxxxxxxxxxxxxxxxx> > Analyzed-by: Vlastimil Babka <vbabka@xxxxxxx> > Analyzed-by: Matthew Wilcox <willy@xxxxxxxxxxxxx> > Tested-by: Chris Murphy <lists@xxxxxxxxxxxxxxxxx> > Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx> > Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx # 3.1+ Reviewed-by: Vlastimil Babka <vbabka@xxxxxxx> Thanks! > --- > > mm/swap_state.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > --- 5.8-rc1/mm/swap_state.c 2020-06-14 15:13:01.518042420 -0700 > +++ linux/mm/swap_state.c 2020-06-15 11:48:02.346691901 -0700 > @@ -21,7 +21,7 @@ > #include <linux/vmalloc.h> > #include <linux/swap_slots.h> > #include <linux/huge_mm.h> > - > +#include "internal.h" > > /* > * swapper_space is a fiction, retained to simplify the path through > @@ -429,7 +429,7 @@ struct page *__read_swap_cache_async(swp > __SetPageSwapBacked(page); > > /* May fail (-ENOMEM) if XArray node allocation failed. */ > - if (add_to_swap_cache(page, entry, gfp_mask & GFP_KERNEL)) { > + if (add_to_swap_cache(page, entry, gfp_mask & GFP_RECLAIM_MASK)) { > put_swap_page(page, entry); > goto fail_unlock; > } >
