linux/mm
Jens Axboe 0dd316ba86 mm: honor FGP_NOWAIT for page cache page allocation
If we're creating a page cache page with FGP_CREAT but FGP_NOWAIT is
set, we should dial back the gfp flags to avoid frivolous blocking
which is trivial to hit in low memory conditions:

[   10.117661]  __schedule+0x8c/0x550
[   10.118305]  schedule+0x58/0xa0
[   10.118897]  schedule_timeout+0x30/0xdc
[   10.119610]  __wait_for_common+0x88/0x114
[   10.120348]  wait_for_completion+0x1c/0x24
[   10.121103]  __flush_work.isra.0+0x16c/0x19c
[   10.121896]  flush_work+0xc/0x14
[   10.122496]  __drain_all_pages+0x144/0x218
[   10.123267]  drain_all_pages+0x10/0x18
[   10.123941]  __alloc_pages+0x464/0x9e4
[   10.124633]  __folio_alloc+0x18/0x3c
[   10.125294]  __filemap_get_folio+0x17c/0x204
[   10.126084]  iomap_write_begin+0xf8/0x428
[   10.126829]  iomap_file_buffered_write+0x144/0x24c
[   10.127710]  xfs_file_buffered_write+0xe8/0x248
[   10.128553]  xfs_file_write_iter+0xa8/0x120
[   10.129324]  io_write+0x16c/0x38c
[   10.129940]  io_issue_sqe+0x70/0x1cc
[   10.130617]  io_queue_sqe+0x18/0xfc
[   10.131277]  io_submit_sqes+0x5d4/0x600
[   10.131946]  __arm64_sys_io_uring_enter+0x224/0x600
[   10.132752]  invoke_syscall.constprop.0+0x70/0xc0
[   10.133616]  do_el0_svc+0xd0/0x118
[   10.134238]  el0_svc+0x78/0xa0

Clear IO, FS, and reclaim flags and mark the allocation as GFP_NOWAIT and
add __GFP_NOWARN to avoid polluting dmesg with pointless allocations
failures. A caller with FGP_NOWAIT must be expected to handle the
resulting -EAGAIN return and retry from a suitable context without NOWAIT
set.

Reviewed-by: Shakeel Butt <shakeelb@google.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:32 -06:00
..
damon mm/damon: use set_huge_pte_at() to make huge pte old 2022-07-03 15:42:32 -07:00
kasan mm: kasan: fix input of vmalloc_to_page() 2022-05-27 09:33:46 -07:00
kfence mm/kfence: select random number before taking raw lock 2022-06-16 19:11:31 -07:00
backing-dev.c init: Initialize noop_backing_dev_info early 2022-06-16 10:55:57 +02:00
balloon_compaction.c mm/balloon_compaction: make balloon page compaction callbacks static 2022-03-28 16:52:57 -04:00
bootmem_info.c bootmem: Use page->index instead of page->freelist 2022-01-06 12:27:03 +01:00
cma_debug.c
cma_sysfs.c
cma.c Revert "mm/cma.c: remove redundant cma_mutex lock" 2022-05-13 15:11:26 -07:00
cma.h mm/cma: provide option to opt out from exposing pages on activation failure 2022-03-22 15:57:09 -07:00
compaction.c mm, compaction: fast_find_migrateblock() should return pfn in the target zone 2022-05-13 16:48:57 -07:00
debug_page_ref.c
debug_vm_pgtable.c mm/debug_vm_pgtable: add tests for __HAVE_ARCH_PTE_SWP_EXCLUSIVE 2022-05-09 18:20:45 -07:00
debug.c mm: unexport page_init_poison 2022-03-24 19:06:45 -07:00
dmapool.c mm/dmapool.c: revert "make dma pool to use kmalloc_node" 2022-01-15 16:30:28 +02:00
early_ioremap.c mm/early_ioremap: declare early_memremap_pgprot_adjust() 2022-03-22 15:57:11 -07:00
fadvise.c riscv: compat: syscall: Add compat_sys_call_table implementation 2022-04-26 13:36:25 -07:00
failslab.c mm: fix missing handler for __GFP_NOWARN 2022-05-19 14:08:55 -07:00
filemap.c mm: honor FGP_NOWAIT for page cache page allocation 2022-07-24 18:39:32 -06:00
folio-compat.c fs: Remove aop flags parameter from grab_cache_page_write_begin() 2022-05-08 14:28:19 -04:00
frontswap.c frontswap: remove support for multiple ops 2022-01-22 08:33:38 +02:00
gup_test.c
gup_test.h
gup.c Yang Shi has improved the behaviour of khugepaged collapsing of readonly 2022-05-26 12:32:41 -07:00
highmem.c highmem: fix checks in __kmap_local_sched_{in,out} 2022-04-08 14:20:36 -10:00
hmm.c mm: teach core mm about pte markers 2022-05-13 07:20:09 -07:00
huge_memory.c mm: Clear page->private when splitting or migrating a page 2022-06-23 12:21:44 -04:00
hugetlb_cgroup.c hugetlb: add hugetlb.*.numa_stat file 2022-01-15 16:30:29 +02:00
hugetlb_vmemmap.c mm: hugetlb_vmemmap: fix CONFIG_HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON 2022-06-01 15:57:16 -07:00
hugetlb_vmemmap.h mm: hugetlb_vmemmap: cleanup CONFIG_HUGETLB_PAGE_FREE_VMEMMAP* 2022-04-28 23:16:15 -07:00
hugetlb.c delayacct: track delays from write-protect copy 2022-06-01 15:55:25 -07:00
hwpoison-inject.c mm/memory-failure: disable unpoison once hw error happens 2022-06-16 19:11:32 -07:00
init-mm.c kernel/fork: Initialize mm's PASID 2022-02-14 19:51:47 +01:00
internal.h mm: split free page with properly free memory accounting and without race 2022-05-27 09:33:43 -07:00
interval_tree.c
io-mapping.c
ioremap.c mm: move ioremap_page_range to vmalloc.c 2021-09-08 11:50:24 -07:00
Kconfig mm: Kconfig: reorganize misplaced mm options 2022-05-27 09:33:47 -07:00
Kconfig.debug Two followon fixes for the post-5.19 series "Use pageblock_order for cma 2022-05-27 11:40:49 -07:00
khugepaged.c mm: khugepaged: introduce khugepaged_enter_vma() helper 2022-05-19 14:08:50 -07:00
kmemleak.c mm: kmemleak: take a full lowmem check in kmemleak_*_phys() 2022-04-15 14:49:56 -07:00
ksm.c ksm: fix typo in comment 2022-05-25 10:47:48 -07:00
list_lru.c mm/list_lru.c: revert "mm/list_lru: optimize memcg_reparent_list_lru_node()" 2022-04-08 14:20:36 -10:00
maccess.c asm-generic updates for 5.18 2022-03-23 18:03:08 -07:00
madvise.c mm/memory-failure: disable unpoison once hw error happens 2022-06-16 19:11:32 -07:00
Makefile mm: hugetlb_vmemmap: cleanup CONFIG_HUGETLB_PAGE_FREE_VMEMMAP* 2022-04-28 23:16:15 -07:00
mapping_dirty_helpers.c mm: move tlb_flush_pending inline helpers to mm_inline.h 2022-01-15 16:30:27 +02:00
memblock.c memblock: test suite and a small cleanup 2022-03-27 13:36:06 -07:00
memcontrol.c mm: memcontrol: reference to tools/cgroup/memcg_slabinfo.py 2022-06-16 19:11:32 -07:00
memfd.c memfd: fix F_SEAL_WRITE after shmem huge page allocated 2022-03-05 11:08:32 -08:00
memory_hotplug.c mm: hugetlb_vmemmap: add hugetlb_optimize_vmemmap sysctl 2022-05-13 16:48:56 -07:00
memory-failure.c mm/memory-failure: disable unpoison once hw error happens 2022-06-16 19:11:32 -07:00
memory.c mm: split huge PUD on wp_huge_pud fallback 2022-07-03 15:42:33 -07:00
mempolicy.c mm/mempolicy: fix uninit-value in mpol_rebind_policy() 2022-05-19 14:08:54 -07:00
mempool.c mm: remove spurious blkdev.h includes 2021-10-18 06:17:01 -06:00
memremap.c mm/memremap: fix missing call to untrack_pfn() in pagemap_range() 2022-06-01 15:57:16 -07:00
memtest.c
migrate_device.c mm: remember exclusively mapped anonymous pages with PG_anon_exclusive 2022-05-09 18:20:44 -07:00
migrate.c mm: Clear page->private when splitting or migrating a page 2022-06-23 12:21:44 -04:00
mincore.c mm: teach core mm about pte markers 2022-05-13 07:20:09 -07:00
mlock.c mm/munlock: protect the per-CPU pagevec by a local_lock_t 2022-04-01 11:46:09 -07:00
mm_init.c
mmap_lock.c
mmap.c powerpc updates for 5.19 2022-05-28 11:27:17 -07:00
mmu_gather.c mm/mmu_gather: limit free batch count and add schedule point in tlb_batch_pages_flush 2022-04-28 23:16:12 -07:00
mmu_notifier.c mm/mmu_notifier.c: fix race in mmu_interval_notifier_remove() 2022-04-21 20:01:10 -07:00
mmzone.c Folio changes for 5.18 2022-03-22 17:03:12 -07:00
mprotect.c mm/hugetlb: handle UFFDIO_WRITEPROTECT 2022-05-13 07:20:11 -07:00
mremap.c Yang Shi has improved the behaviour of khugepaged collapsing of readonly 2022-05-26 12:32:41 -07:00
msync.c
nommu.c no-MMU: expose vmalloc_huge() for alloc_large_system_hash() 2022-04-25 10:11:49 -07:00
oom_kill.c mm/oom_kill.c: fix vm_oom_kill_table[] ifdeffery 2022-06-01 15:57:16 -07:00
page_alloc.c Two followon fixes for the post-5.19 series "Use pageblock_order for cma 2022-05-27 11:40:49 -07:00
page_counter.c mm/page_counter: remove an incorrect call to propagate_protected_usage() 2022-01-15 16:30:27 +02:00
page_ext.c mm: use for_each_online_node and node_online instead of open coding 2022-04-29 14:36:58 -07:00
page_idle.c mm: don't be stuck to rmap lock on reclaim path 2022-05-19 14:08:54 -07:00
page_io.c Yang Shi has improved the behaviour of khugepaged collapsing of readonly 2022-05-26 12:32:41 -07:00
page_isolation.c mm/page_isolation.c: fix one kernel-doc comment 2022-06-16 19:11:30 -07:00
page_owner.c Yang Shi has improved the behaviour of khugepaged collapsing of readonly 2022-05-26 12:32:41 -07:00
page_poison.c
page_reporting.c
page_reporting.h
page_table_check.c Six hotfixes. One from Miaohe Lin is considered a minor thing so it isn't 2022-05-27 11:29:35 -07:00
page_vma_mapped.c mm: pvmw: add support for walking devmap pages 2022-04-28 23:16:10 -07:00
page-writeback.c mm: Add balance_dirty_pages_ratelimited_flags() function 2022-07-24 18:39:31 -06:00
pagewalk.c
percpu-internal.h percpu: improve percpu_alloc_percpu event trace 2022-05-13 07:20:18 -07:00
percpu-km.c
percpu-stats.c mm: use vmalloc_array and vcalloc for array allocations 2022-03-08 09:30:46 -05:00
percpu-vm.c
percpu.c percpu: improve percpu_alloc_percpu event trace 2022-05-13 07:20:18 -07:00
pgalloc-track.h
pgtable-generic.c mm: avoid unnecessary flush on change_huge_pmd() 2022-05-13 07:20:05 -07:00
process_vm_access.c
ptdump.c mm: sparsemem: use page table lock to protect kernel pmd operations 2022-03-22 15:57:08 -07:00
readahead.c filemap: Fix serialization adding transparent huge pages to page cache 2022-06-23 12:22:00 -04:00
rmap.c mm/rmap: fix dereferencing invalid subpage pointer in try_to_migrate_one() 2022-07-03 15:42:33 -07:00
rodata_test.c
secretmem.c secretmem: Convert to free_folio 2022-05-09 23:12:53 -04:00
shmem.c Two followon fixes for the post-5.19 series "Use pageblock_order for cma 2022-05-27 11:40:49 -07:00
shuffle.c
shuffle.h
slab_common.c Yang Shi has improved the behaviour of khugepaged collapsing of readonly 2022-05-26 12:32:41 -07:00
slab.c Yang Shi has improved the behaviour of khugepaged collapsing of readonly 2022-05-26 12:32:41 -07:00
slab.h slab changes for 5.19 2022-05-25 10:24:04 -07:00
slob.c mm: make minimum slab alignment a runtime property 2022-05-13 07:20:07 -07:00
slub.c mm/slub: add missing TID updates on slab deactivation 2022-06-13 17:41:36 +02:00
sparse-vmemmap.c mm: sparsemem: fix missing higher order allocation splitting 2022-07-03 15:42:32 -07:00
sparse.c mm/memory-failure.c: move clear_hwpoisoned_pages 2022-05-13 07:20:19 -07:00
swap_cgroup.c mm: use vmalloc_array and vcalloc for array allocations 2022-03-08 09:30:46 -05:00
swap_slots.c mm/swap: remove buggy cache->nr check in refill_swap_slots_cache 2022-05-19 14:08:51 -07:00
swap_state.c mm: filter out swapin error entry in shmem mapping 2022-05-27 09:33:46 -07:00
swap.c mm: lru_cache_disable: use synchronize_rcu_expedited 2022-06-16 19:11:30 -07:00
swap.h swap: convert add_to_swap() to take a folio 2022-05-13 07:20:15 -07:00
swapfile.c Two followon fixes for the post-5.19 series "Use pageblock_order for cma 2022-05-27 11:40:49 -07:00
truncate.c Filesystem folio changes for 5.18 2022-03-22 18:26:56 -07:00
usercopy.c usercopy: Make usercopy resilient against ridiculously large copies 2022-06-13 09:54:52 -07:00
userfaultfd.c mm: userfaultfd: fix UFFDIO_CONTINUE on fallocated shmem pages 2022-07-03 15:42:32 -07:00
util.c powerpc updates for 5.19 2022-05-28 11:27:17 -07:00
vmacache.c
vmalloc.c usercopy: Handle vm_map_ram() areas 2022-06-13 09:54:52 -07:00
vmpressure.c mm/vmpressure: fix data-race with memcg->socket_pressure 2021-11-06 13:30:40 -07:00
vmscan.c Yang Shi has improved the behaviour of khugepaged collapsing of readonly 2022-05-26 12:32:41 -07:00
vmstat.c Bitmap patches for 5.19-rc1 2022-06-04 14:04:27 -07:00
workingset.c memcg: sync flush only if periodic flush is delayed 2022-04-21 20:01:09 -07:00
z3fold.c mm/z3fold: fix z3fold_page_migrate races with z3fold_map 2022-05-27 09:33:44 -07:00
zbud.c
zpool.c zpool: remove the list of pools_head 2022-01-15 16:30:31 +02:00
zsmalloc.c zsmalloc: fix races between asynchronous zspage free and page migration 2022-05-13 15:11:26 -07:00
zswap.c zswap: memcg accounting 2022-05-19 14:08:53 -07:00