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Michal Hocko 93065ac753 mm, oom: distinguish blockable mode for mmu notifiers 
There are several blockable mmu notifiers which might sleep in
mmu_notifier_invalidate_range_start and that is a problem for the
oom_reaper because it needs to guarantee a forward progress so it cannot
depend on any sleepable locks.

Currently we simply back off and mark an oom victim with blockable mmu
notifiers as done after a short sleep.  That can result in selecting a new
oom victim prematurely because the previous one still hasn't torn its
memory down yet.

We can do much better though.  Even if mmu notifiers use sleepable locks
there is no reason to automatically assume those locks are held.  Moreover
majority of notifiers only care about a portion of the address space and
there is absolutely zero reason to fail when we are unmapping an unrelated
range.  Many notifiers do really block and wait for HW which is harder to
handle and we have to bail out though.

This patch handles the low hanging fruit.
__mmu_notifier_invalidate_range_start gets a blockable flag and callbacks
are not allowed to sleep if the flag is set to false.  This is achieved by
using trylock instead of the sleepable lock for most callbacks and
continue as long as we do not block down the call chain.

I think we can improve that even further because there is a common pattern
to do a range lookup first and then do something about that.  The first
part can be done without a sleeping lock in most cases AFAICS.

The oom_reaper end then simply retries if there is at least one notifier
which couldn't make any progress in !blockable mode.  A retry loop is
already implemented to wait for the mmap_sem and this is basically the
same thing.

The simplest way for driver developers to test this code path is to wrap
userspace code which uses these notifiers into a memcg and set the hard
limit to hit the oom.  This can be done e.g.  after the test faults in all
the mmu notifier managed memory and set the hard limit to something really
small.  Then we are looking for a proper process tear down.

[akpm@linux-foundation.org: coding style fixes]
[akpm@linux-foundation.org: minor code simplification]
Link: http://lkml.kernel.org/r/20180716115058.5559-1-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Christian König <christian.koenig@amd.com> # AMD notifiers
Acked-by: Leon Romanovsky <leonro@mellanox.com> # mlx and umem_odp
Reported-by: David Rientjes <rientjes@google.com>
Cc: "David (ChunMing) Zhou" <David1.Zhou@amd.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Doug Ledford <dledford@redhat.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Mike Marciniszyn <mike.marciniszyn@intel.com>
Cc: Dennis Dalessandro <dennis.dalessandro@intel.com>
Cc: Sudeep Dutt <sudeep.dutt@intel.com>
Cc: Ashutosh Dixit <ashutosh.dixit@intel.com>
Cc: Dimitri Sivanich <sivanich@sgi.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: "Jérôme Glisse" <jglisse@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2018-08-22 10:52:44 -07:00
..
reg_srcs
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.gitignore
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Kconfig drm/radeon: remove UMS support 2015-12-02 12:45:54 -05:00
Makefile main drm pull request for v4.15 2017-11-15 20:42:10 -08:00
ObjectID.h
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atom-bits.h
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atom-names.h
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atom-types.h
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atom.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
atom.h drm/radeon: add locking around atombios scratch space usage 2014-11-11 17:22:26 -05:00
atombios.h scripts/spelling.txt: add "aligment" pattern and fix typo instances 2017-02-27 18:43:46 -08:00
atombios_crtc.c drm/radeon: radeon_framebuffer -> drm_framebuffer 2018-04-11 13:07:56 -05:00
atombios_dp.c drm/radeon: fix atombios on big endian 2017-10-31 18:24:59 -04:00
atombios_encoders.c drm/radeon: Fix eDP for single-display iMac10,1 (v2) 2017-07-07 11:11:28 -04:00
atombios_i2c.c drm/radeon: add locking around atombios scratch space usage 2014-11-11 17:22:26 -05:00
avivod.h
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btc_dpm.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
btc_dpm.h Revert "drm/radeon: drop btc_get_max_clock_from_voltage_dependency_table" 2014-10-13 11:34:13 -04:00
btcd.h
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cayman_blit_shaders.c drm: fix trivial typos 2015-10-21 11:35:11 -04:00
cayman_blit_shaders.h
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ci_dpm.c drm/radeon: use pcie functions for link width 2018-07-05 16:40:00 -05:00
ci_dpm.h drm/radeon: move ci_send_msg_to_smc to where it's used 2017-10-08 20:16:28 -04:00
ci_smc.c drm/radeon: move ci_send_msg_to_smc to where it's used 2017-10-08 20:16:28 -04:00
cik.c drm/radeon: use pcie functions for link width 2018-07-05 16:40:00 -05:00
cik_blit_shaders.c
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cik_blit_shaders.h
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cik_reg.h drm/radeon: Remove KFD_CIK_SDMA_QUEUE_OFFSET 2017-12-20 12:00:22 -05:00
cik_sdma.c drm/radeon: Avoid double gpu reset by adding a timeout on IB ring tests. 2016-02-10 14:17:15 -05:00
cikd.h drm/radeon: deprecate and remove KFD interface 2017-10-30 14:16:21 +01:00
clearstate_cayman.h drm/radeon: use NULL instead of zero in clearstate headers 2014-06-02 10:25:07 -04:00
clearstate_ci.h drm/radeon: use NULL instead of zero in clearstate headers 2014-06-02 10:25:07 -04:00
clearstate_defs.h
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clearstate_evergreen.h
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clearstate_si.h drm/radeon: use NULL instead of zero in clearstate headers 2014-06-02 10:25:07 -04:00
cypress_dpm.c drm/radeon: fix include notation and remove -Iinclude/drm flag 2017-05-17 14:36:40 +02:00
cypress_dpm.h
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dce3_1_afmt.c drm/radeon: use proper ACR regisiter for DCE3.2 2015-06-01 23:16:22 -04:00
dce6_afmt.c drm/radeon: Add a common function for DFS handling 2016-01-27 12:48:32 -05:00
evergreen.c drm/radeon: fill in rb backend map on evergreen/ni. 2018-01-16 15:35:28 -05:00
evergreen_blit_shaders.c drm: fix trivial typos 2015-10-21 11:35:11 -04:00
evergreen_blit_shaders.h
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evergreen_cs.c gpu: drm: amd/radeon: Convert printk(KERN_<LEVEL> to pr_<level> 2017-03-29 23:53:24 -04:00
evergreen_dma.c drm/radeon: split semaphore and sync object handling v2 2014-11-20 13:00:16 -05:00
evergreen_hdmi.c drm/radeon: fix indentation. 2016-03-16 18:08:06 -04:00
evergreen_reg.h drm/radeon: fix vertical bars appear on monitor (v2) 2016-04-27 12:27:08 -04:00
evergreen_smc.h drm/radeon/dpm: fix typo in EVERGREEN_SMC_FIRMWARE_HEADER_softRegisters 2014-03-06 16:46:58 -05:00
evergreend.h drm/radeon: switch UVD code to use UVD_NO_OP for padding 2016-08-24 16:25:05 -04:00
kv_dpm.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
kv_dpm.h
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kv_smc.c drm/radeon: fix include notation and remove -Iinclude/drm flag 2017-05-17 14:36:40 +02:00
mkregtable.c drm/radeon/mkregtable: Delete unused list functions and macros 2018-03-05 13:31:11 -05:00
ni.c drm/radeon: fill in rb backend map on evergreen/ni. 2018-01-16 15:35:28 -05:00
ni_dma.c drm/radeon: Remove rdev->gart.pages_addr array 2015-01-22 11:48:03 -05:00
ni_dpm.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
ni_dpm.h
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ni_reg.h drm/radeon/mst: port some MST setup code from DAL. 2016-04-06 14:57:46 -04:00
nid.h drm/radeon: switch UVD code to use UVD_NO_OP for padding 2016-08-24 16:25:05 -04:00
nislands_smc.h
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ppsmc.h drm/radeon/dpm: add thermal dpm support for CI 2014-11-20 13:00:10 -05:00
pptable.h drm/radeon/dpm: add smc fan control for CI (v2) 2014-11-20 13:00:10 -05:00
r100.c drm: Pass struct drm_file * to __drm_mode_object_find [v2] 2017-10-12 10:03:04 +10:00
r100_track.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
r100d.h
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r200.c gpu: drm: amd/radeon: Convert printk(KERN_<LEVEL> to pr_<level> 2017-03-29 23:53:24 -04:00
r300.c gpu: drm: amd/radeon: Convert printk(KERN_<LEVEL> to pr_<level> 2017-03-29 23:53:24 -04:00
r300_reg.h
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r300d.h
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r420.c drm/radeon: check return value of radeon_ring_lock 2017-04-28 17:33:02 -04:00
r420d.h
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r500_reg.h drm/radeon: Bypass hw lut's for > 8 bpc framebuffer scanout. 2014-06-13 12:22:30 -04:00
r520.c gpu: drm: amd/radeon: Convert printk(KERN_<LEVEL> to pr_<level> 2017-03-29 23:53:24 -04:00
r520d.h
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r600.c drm/radeon: Unbreak HPD handling for r600+ 2017-05-24 17:39:33 -04:00
r600_blit_shaders.c drm: fix trivial typos 2015-10-21 11:35:11 -04:00
r600_blit_shaders.h
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r600_cs.c drm: Pass struct drm_file * to __drm_mode_object_find [v2] 2017-10-12 10:03:04 +10:00
r600_dma.c drm/radeon: Avoid double gpu reset by adding a timeout on IB ring tests. 2016-02-10 14:17:15 -05:00
r600_dpm.c drm/radeon: use pcie functions for link width 2018-07-05 16:40:00 -05:00
r600_dpm.h drm/radeon/dpm: add smc fan control for SI (v2) 2014-11-20 13:00:09 -05:00
r600_hdmi.c drm/radeon: properly initialize r600_audio_status() data 2017-09-18 23:30:30 -04:00
r600_reg.h
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r600d.h drm/radeon: add support for UVD_NO_OP register 2016-08-24 16:25:04 -04:00
radeon.h drm/radeon: use pcie functions for link width 2018-07-05 16:40:00 -05:00
radeon_acpi.c drm/radeon: Make radeon_atif_handler static 2017-08-15 14:46:07 -04:00
radeon_acpi.h drm/radeon: Make radeon_atif_handler static 2017-08-15 14:46:07 -04:00
radeon_agp.c add blacklist for thinkpad T40p 2015-11-30 14:44:34 -05:00
radeon_asic.c drm/radeon: add driver option to disable vce block. 2016-05-02 13:08:53 -04:00
radeon_asic.h drm/radeon: Support DRM_MODE_PAGE_FLIP_ASYNC 2016-05-04 20:19:03 -04:00
radeon_atombios.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
radeon_atpx_handler.c drm/radeon: fix radeon_atpx_get_client_id()'s return type 2018-05-15 13:43:51 -05:00
radeon_audio.c drm: handle HDMI 2.0 VICs in AVI info-frames 2017-07-14 21:23:54 +03:00
radeon_audio.h drm/radeon: Add a common function for DFS handling 2016-01-27 12:48:32 -05:00
radeon_benchmark.c drm/radeon: fix the crash in benchmark functions 2015-02-02 11:39:35 -05:00
radeon_bios.c drm/radeon: remove some dead code 2017-02-08 21:04:29 -05:00
radeon_clocks.c gpu: drm: amd/radeon: Convert printk(KERN_<LEVEL> to pr_<level> 2017-03-29 23:53:24 -04:00
radeon_combios.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
radeon_connectors.c drm: drop _mode_ from update_edit_property() 2018-07-13 18:40:27 +02:00
radeon_cs.c drm/radeon: Fix preferred typo 2017-08-15 14:46:16 -04:00
radeon_cursor.c drm/radeon: switch to drm_*{get,put} helpers 2017-08-15 14:46:12 -04:00
radeon_device.c drm/radeon: add PX quirk for Asus K73TK 2018-05-15 13:43:02 -05:00
radeon_display.c drm/radeon: radeon_framebuffer -> drm_framebuffer 2018-04-11 13:07:56 -05:00
radeon_dp_auxch.c drm/radeon/dp_auxch: Ratelimit aux transfer debug messages 2017-03-29 23:53:21 -04:00
radeon_dp_mst.c drm: drop _mode_ from remaining connector functions 2018-07-13 18:40:27 +02:00
radeon_drv.c drm/radeon: Change the default to PCI on PowerPC 2018-05-15 13:43:52 -05:00
radeon_drv.h drm/radeon: remove UMS support 2015-12-02 12:45:54 -05:00
radeon_encoders.c drm: drop _mode_ from drm_mode_connector_attach_encoder 2018-07-13 18:40:27 +02:00
radeon_family.h drm/radeon: add Mullins chip family 2014-05-06 12:19:57 +02:00
radeon_fb.c drm/radeon: radeon_framebuffer -> drm_framebuffer 2018-04-11 13:07:56 -05:00
radeon_fence.c sched/wait: Rename wait_queue_t => wait_queue_entry_t 2017-06-20 12:18:27 +02:00
radeon_gart.c treewide: Use array_size() in vzalloc() 2018-06-12 16:19:22 -07:00
radeon_gem.c drm/radeon: fix prime teardown order 2018-03-14 15:39:42 -05:00
radeon_i2c.c drm/radeon: fix up dp aux tear down (v2) 2016-10-12 15:44:13 -04:00
radeon_ib.c drm/radeon: fix indentation. 2016-03-16 18:08:06 -04:00
radeon_irq_kms.c Merge branch 'drm-next-4.14' of git://people.freedesktop.org/~agd5f/linux into drm-next 2017-08-02 12:43:12 +10:00
radeon_kms.c drm/radeon: Use drm_fb_helper_lastclose() and _poll_changed() 2017-12-06 12:48:34 -05:00
radeon_legacy_crtc.c drm/radeon: radeon_framebuffer -> drm_framebuffer 2018-04-11 13:07:56 -05:00
radeon_legacy_encoders.c drm/radeon: add missing header dependencies 2016-10-25 14:38:18 -04:00
radeon_legacy_tv.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
radeon_mn.c mm, oom: distinguish blockable mode for mmu notifiers 2018-08-22 10:52:44 -07:00
radeon_mode.h drm/radeon: radeon_framebuffer -> drm_framebuffer 2018-04-11 13:07:56 -05:00
radeon_object.c drm/radeon: Replace ttm_bo_unref with ttm_bo_put 2018-07-31 16:58:22 -05:00
radeon_object.h drm/ttm: add evict parameter to ttm_bo_driver::move_notify 2017-01-27 11:13:15 -05:00
radeon_pm.c Revert "drm/radeon/pm: autoswitch power state when in balanced mode" 2018-02-20 16:27:16 -05:00
radeon_prime.c drm/radeon: Maintain prime import/export refcount for BOs 2017-04-07 12:20:40 -04:00
radeon_reg.h
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radeon_ring.c drm: drop drm_[cm]alloc* helpers 2017-05-18 17:22:39 +02:00
radeon_sa.c drm/radeon: hold reference to fences in radeon_sa_bo_new 2016-02-10 14:07:44 -05:00
radeon_semaphore.c drm/radeon: fix indentation. 2016-03-16 18:08:06 -04:00
radeon_sync.c dma-buf: Rename struct fence to dma_fence 2016-10-25 14:40:39 +02:00
radeon_test.c drm/radeon: add SPDX identifier and clarify license 2018-07-05 16:39:54 -05:00
radeon_trace.h main drm pull request for v4.15 2017-11-15 20:42:10 -08:00
radeon_trace_points.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
radeon_ttm.c gpu: drm: radeon: Adding new typedef vm_fault_t 2018-06-19 13:17:38 -05:00
radeon_ucode.c drm/radeon: add new firmware header definitions (v3) 2014-08-05 08:53:22 -04:00
radeon_ucode.h drm/radeon: add new firmware header definitions (v3) 2014-08-05 08:53:22 -04:00
radeon_uvd.c drm/radeon: adjust tested variable 2018-01-29 23:18:17 -05:00
radeon_vce.c drm/radeon: fix indentation. 2016-03-16 18:08:06 -04:00
radeon_vm.c drm/ttm: add operation ctx to ttm_bo_validate v2 2017-12-06 12:48:01 -05:00
rs100d.h
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rs400.c gpu: drm: amd/radeon: Convert printk(KERN_<LEVEL> to pr_<level> 2017-03-29 23:53:24 -04:00
rs400d.h
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rs600.c drm/radeon: Support DRM_MODE_PAGE_FLIP_ASYNC 2016-05-04 20:19:03 -04:00
rs600d.h
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rs690.c gpu: drm: amd/radeon: Convert printk(KERN_<LEVEL> to pr_<level> 2017-03-29 23:53:24 -04:00
rs690d.h
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rs780_dpm.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
rs780_dpm.h
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rs780d.h
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rv6xx_dpm.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
rv6xx_dpm.h
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rv6xxd.h
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rv200d.h
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rv250d.h
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rv350d.h
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rv515.c gpu: drm: amd/radeon: Convert printk(KERN_<LEVEL> to pr_<level> 2017-03-29 23:53:24 -04:00
rv515d.h
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rv730_dpm.c drm/radeon: fix include notation and remove -Iinclude/drm flag 2017-05-17 14:36:40 +02:00
rv730d.h
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rv740_dpm.c drm/radeon: fix include notation and remove -Iinclude/drm flag 2017-05-17 14:36:40 +02:00
rv740d.h
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rv770.c drm/radeon: switch UVD code to use UVD_NO_OP for padding 2016-08-24 16:25:05 -04:00
rv770_dma.c drm/radeon: split semaphore and sync object handling v2 2014-11-20 13:00:16 -05:00
rv770_dpm.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
rv770_dpm.h drm/radeon: comment out some currently unused 7xx dpm code 2015-01-22 10:38:58 -05:00
rv770_smc.c drm/radeon: fix include notation and remove -Iinclude/drm flag 2017-05-17 14:36:40 +02:00
rv770_smc.h
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rv770d.h drm/radeon: switch UVD code to use UVD_NO_OP for padding 2016-08-24 16:25:05 -04:00
si.c drm/radeon: use pcie functions for link width 2018-07-05 16:40:00 -05:00
si_blit_shaders.c
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si_blit_shaders.h
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si_dma.c drm/radeon: Remove rdev->gart.pages_addr array 2015-01-22 11:48:03 -05:00
si_dpm.c drm/radeon: use pcie functions for link width 2018-07-05 16:40:00 -05:00
si_dpm.h drm/radeon: bind fan control on SI cards to hwmon interface 2015-01-22 10:38:48 -05:00
si_reg.h
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si_smc.c drm/radeon: fix include notation and remove -Iinclude/drm flag 2017-05-17 14:36:40 +02:00
sid.h drm/radeon: allow TA_CS_BC_BASE_ADDR on SI 2016-10-12 15:44:15 -04:00
sislands_smc.h drm/radeon/si/dpm: fix phase shedding setup 2016-09-28 16:13:16 -04:00
smu7.h
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smu7_discrete.h drm/radeon/dpm: add smc fan control for CI (v2) 2014-11-20 13:00:10 -05:00
smu7_fusion.h
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sumo_dpm.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
sumo_dpm.h drm/radeon: comment out some currently unused sumo dpm code 2015-01-22 10:38:57 -05:00
sumo_smc.c drm/radeon: fix include notation and remove -Iinclude/drm flag 2017-05-17 14:36:40 +02:00
sumod.h
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trinity_dpm.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
trinity_dpm.h
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trinity_smc.c drm/radeon: fix include notation and remove -Iinclude/drm flag 2017-05-17 14:36:40 +02:00
trinityd.h
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uvd_v1_0.c drm/radeon: handle more than 10 UVD sessions 2016-05-04 20:19:43 -04:00
uvd_v2_2.c drm/radeon: handle more than 10 UVD sessions 2016-05-04 20:19:43 -04:00
uvd_v3_1.c
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uvd_v4_2.c drm/radeon: handle more than 10 UVD sessions 2016-05-04 20:19:43 -04:00
vce_v1_0.c drm/radeon: avoid kernel segfault in vce when gpu fails to resume 2017-02-08 20:59:16 -05:00
vce_v2_0.c drm/radeon: add header comment for clarification to vce_v2_0_enable_mgcg() 2017-07-14 11:05:55 -04:00