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Michal Hocko 0ee931c4e3 mm: treewide: remove GFP_TEMPORARY allocation flag 
GFP_TEMPORARY was introduced by commit e12ba74d8f ("Group short-lived
and reclaimable kernel allocations") along with __GFP_RECLAIMABLE.  It's
primary motivation was to allow users to tell that an allocation is
short lived and so the allocator can try to place such allocations close
together and prevent long term fragmentation.  As much as this sounds
like a reasonable semantic it becomes much less clear when to use the
highlevel GFP_TEMPORARY allocation flag.  How long is temporary? Can the
context holding that memory sleep? Can it take locks? It seems there is
no good answer for those questions.

The current implementation of GFP_TEMPORARY is basically GFP_KERNEL |
__GFP_RECLAIMABLE which in itself is tricky because basically none of
the existing caller provide a way to reclaim the allocated memory.  So
this is rather misleading and hard to evaluate for any benefits.

I have checked some random users and none of them has added the flag
with a specific justification.  I suspect most of them just copied from
other existing users and others just thought it might be a good idea to
use without any measuring.  This suggests that GFP_TEMPORARY just
motivates for cargo cult usage without any reasoning.

I believe that our gfp flags are quite complex already and especially
those with highlevel semantic should be clearly defined to prevent from
confusion and abuse.  Therefore I propose dropping GFP_TEMPORARY and
replace all existing users to simply use GFP_KERNEL.  Please note that
SLAB users with shrinkers will still get __GFP_RECLAIMABLE heuristic and
so they will be placed properly for memory fragmentation prevention.

I can see reasons we might want some gfp flag to reflect shorterm
allocations but I propose starting from a clear semantic definition and
only then add users with proper justification.

This was been brought up before LSF this year by Matthew [1] and it
turned out that GFP_TEMPORARY really doesn't have a clear semantic.  It
seems to be a heuristic without any measured advantage for most (if not
all) its current users.  The follow up discussion has revealed that
opinions on what might be temporary allocation differ a lot between
developers.  So rather than trying to tweak existing users into a
semantic which they haven't expected I propose to simply remove the flag
and start from scratch if we really need a semantic for short term
allocations.

[1] http://lkml.kernel.org/r/20170118054945.GD18349@bombadil.infradead.org

[akpm@linux-foundation.org: fix typo]
[akpm@linux-foundation.org: coding-style fixes]
[sfr@canb.auug.org.au: drm/i915: fix up]
  Link: http://lkml.kernel.org/r/20170816144703.378d4f4d@canb.auug.org.au
Link: http://lkml.kernel.org/r/20170728091904.14627-1-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Acked-by: Mel Gorman <mgorman@suse.de>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Neil Brown <neilb@suse.de>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2017-09-13 18:53:16 -07:00
..
gvt Merge tag 'drm-intel-next-fixes-2017-09-07' of git://anongit.freedesktop.org/git/drm-intel 2017-09-07 14:37:25 -07:00
selftests mm: treewide: remove GFP_TEMPORARY allocation flag 2017-09-13 18:53:16 -07:00
Kconfig drm/i915: select CRC32 2017-06-21 11:13:27 +02:00
Kconfig.debug drm/i915: Add SW_SYNC to our recommend testing Kconfig 2017-08-12 10:30:42 +01:00
Makefile drm/i915: Split obj->cache_coherent to track r/w 2017-08-15 15:46:57 +01:00
dvo.h
…
dvo_ch7xxx.c drm/i915/dvo: fix debug logging on unknown DID 2017-06-01 15:53:03 +03:00
dvo_ch7017.c drm/i915/lvds: Remove magic from PLL programming 2017-05-10 13:47:55 +03:00
dvo_ivch.c
…
dvo_ns2501.c
…
dvo_sil164.c
…
dvo_tfp410.c
…
i915_cmd_parser.c drm/i915: Recreate vmapping even when the object is pinned 2017-08-30 12:08:11 -07:00
i915_debugfs.c drm/i915: wire up shrinkctl->nr_scanned 2017-09-06 17:27:25 -07:00
i915_drv.c drm/i915: Re-enable GTT following a device reset 2017-09-06 10:18:38 -07:00
i915_drv.h Merge tag 'drm-intel-next-fixes-2017-09-07' of git://anongit.freedesktop.org/git/drm-intel 2017-09-07 14:37:25 -07:00
i915_gem.c mm: treewide: remove GFP_TEMPORARY allocation flag 2017-09-13 18:53:16 -07:00
i915_gem.h drm/i915: Squash repeated awaits on the same fence 2017-05-03 11:08:48 +01:00
i915_gem_batch_pool.c drm/i915: Reinstate reservation_object zapping for batch_pool objects 2017-06-14 14:06:22 +01:00
i915_gem_batch_pool.h
…
i915_gem_clflush.c drm/i915: Split obj->cache_coherent to track r/w 2017-08-15 15:46:57 +01:00
i915_gem_clflush.h drm/i915: Force CPU synchronisation even if userspace requests ASYNC 2017-07-27 22:07:24 +02:00
i915_gem_context.c drm/i915: Replace execbuf vma ht with an idr 2017-08-18 11:59:02 +01:00
i915_gem_context.h drm/i915: Replace execbuf vma ht with an idr 2017-08-18 11:59:02 +01:00
i915_gem_dmabuf.c drm/i915: Implement dma_buf_ops->kmap 2017-05-03 23:15:02 +01:00
i915_gem_evict.c drm/i915: Convert execbuf to use struct-of-array packing for critical fields 2017-08-18 11:57:36 +01:00
i915_gem_execbuffer.c mm: treewide: remove GFP_TEMPORARY allocation flag 2017-09-13 18:53:16 -07:00
i915_gem_fence_reg.c drm/i915: Take rpm wakelock for releasing the fence on unbind 2017-03-06 14:38:18 +00:00
i915_gem_fence_reg.h
…
i915_gem_gtt.c mm: treewide: remove GFP_TEMPORARY allocation flag 2017-09-13 18:53:16 -07:00
i915_gem_gtt.h drm/i915: pass the vma to insert_entries 2017-06-22 16:48:50 +01:00
i915_gem_internal.c drm/i915: Split obj->cache_coherent to track r/w 2017-08-15 15:46:57 +01:00
i915_gem_object.c drm/i915: Split obj->cache_coherent to track r/w 2017-08-15 15:46:57 +01:00
i915_gem_object.h drm/i915: Replace execbuf vma ht with an idr 2017-08-18 11:59:02 +01:00
i915_gem_render_state.c drm/i915: Perform an invalidate prior to executing golden renderstate 2017-08-14 19:28:06 +03:00
i915_gem_render_state.h
…
i915_gem_request.c drm/i915: Mark the GT as busy before idling the previous request 2017-08-18 12:01:41 +01:00
i915_gem_request.h Merge tag 'drm-intel-next-2017-07-17' of git://anongit.freedesktop.org/git/drm-intel into drm-next 2017-07-20 11:31:43 +10:00
i915_gem_shrinker.c drm/i915: wire up shrinkctl->nr_scanned 2017-09-06 17:27:25 -07:00
i915_gem_stolen.c drm/i915: Split obj->cache_coherent to track r/w 2017-08-15 15:46:57 +01:00
i915_gem_tiling.c drm/i915: Fix logical inversion for gen4 quirking 2017-06-07 16:31:34 +03:00
i915_gem_timeline.c drm/i915: Squash repeated awaits on the same fence 2017-05-03 11:08:48 +01:00
i915_gem_timeline.h drm/i915: Rename intel_timeline.sync_seqno[] to .global_sync[] 2017-05-03 11:08:52 +01:00
i915_gem_userptr.c mm: treewide: remove GFP_TEMPORARY allocation flag 2017-09-13 18:53:16 -07:00
i915_gpu_error.c mm: treewide: remove GFP_TEMPORARY allocation flag 2017-09-13 18:53:16 -07:00
i915_guc_reg.h
…
i915_guc_submission.c drm/i915: Differentiate between sw write location into ring and last hw read 2017-06-19 10:52:34 +03:00
i915_ioc32.c
…
i915_irq.c drm/i915: More surgically unbreak the modeset vs reset deadlock 2017-08-14 17:03:36 +02:00
i915_memcpy.c
…
i915_mm.c
…
i915_oa_bdw.c drm/i915/perf: leave GDT_CHICKEN_BITS programming in configs 2017-08-03 18:18:44 +01:00
i915_oa_bdw.h drm/i915/perf: prune OA configs 2017-08-03 18:18:05 +01:00
i915_oa_bxt.c drm/i915/perf: leave GDT_CHICKEN_BITS programming in configs 2017-08-03 18:18:44 +01:00
i915_oa_bxt.h drm/i915/perf: prune OA configs 2017-08-03 18:18:05 +01:00
i915_oa_chv.c drm/i915/perf: leave GDT_CHICKEN_BITS programming in configs 2017-08-03 18:18:44 +01:00
i915_oa_chv.h drm/i915/perf: prune OA configs 2017-08-03 18:18:05 +01:00
i915_oa_glk.c drm/i915/perf: leave GDT_CHICKEN_BITS programming in configs 2017-08-03 18:18:44 +01:00
i915_oa_glk.h drm/i915/perf: prune OA configs 2017-08-03 18:18:05 +01:00
i915_oa_hsw.c drm/i915/perf: leave GDT_CHICKEN_BITS programming in configs 2017-08-03 18:18:44 +01:00
i915_oa_hsw.h drm/i915/perf: prune OA configs 2017-08-03 18:18:05 +01:00
i915_oa_kblgt2.c drm/i915/perf: leave GDT_CHICKEN_BITS programming in configs 2017-08-03 18:18:44 +01:00
i915_oa_kblgt2.h drm/i915/perf: prune OA configs 2017-08-03 18:18:05 +01:00
i915_oa_kblgt3.c drm/i915/perf: leave GDT_CHICKEN_BITS programming in configs 2017-08-03 18:18:44 +01:00
i915_oa_kblgt3.h drm/i915/perf: prune OA configs 2017-08-03 18:18:05 +01:00
i915_oa_sklgt2.c drm/i915/perf: leave GDT_CHICKEN_BITS programming in configs 2017-08-03 18:18:44 +01:00
i915_oa_sklgt2.h drm/i915/perf: prune OA configs 2017-08-03 18:18:05 +01:00
i915_oa_sklgt3.c drm/i915/perf: leave GDT_CHICKEN_BITS programming in configs 2017-08-03 18:18:44 +01:00
i915_oa_sklgt3.h drm/i915/perf: prune OA configs 2017-08-03 18:18:05 +01:00
i915_oa_sklgt4.c drm/i915/perf: leave GDT_CHICKEN_BITS programming in configs 2017-08-03 18:18:44 +01:00
i915_oa_sklgt4.h drm/i915/perf: prune OA configs 2017-08-03 18:18:05 +01:00
i915_params.c drm/i915/opregion: let user specify override VBT via firmware load 2017-08-17 16:34:54 +03:00
i915_params.h drm/i915/opregion: let user specify override VBT via firmware load 2017-08-17 16:34:54 +03:00
i915_pci.c drm/i915: Disable per-engine reset for Broxton 2017-07-27 09:38:48 +02:00
i915_perf.c Linux 4.13-rc5 2017-08-15 16:16:58 +10:00
i915_pvinfo.h drm/i915: Enable guest i915 full ppgtt functionality 2017-08-15 10:12:48 +08:00
i915_reg.h drm/i915/cnl: Setup PAT Index. 2017-08-15 16:57:24 -07:00
i915_selftest.h drm/i915: Don't use MI_STORE_DWORD_IMM on Sandybridge/vcs 2017-08-18 11:55:02 +01:00
i915_suspend.c
…
i915_sw_fence.c main drm pull for v4.13 2017-07-09 18:48:37 -07:00
i915_sw_fence.h main drm pull for v4.13 2017-07-09 18:48:37 -07:00
i915_syncmap.c drm/i915: Squash repeated awaits on the same fence 2017-05-03 11:08:48 +01:00
i915_syncmap.h drm/i915: Squash repeated awaits on the same fence 2017-05-03 11:08:48 +01:00
i915_sysfs.c drm/i915: add const to bin_attribute 2017-08-03 12:20:09 +02:00
i915_trace.h drm/i915: Fix enum pipe vs. enum transcoder for the PCH transcoder 2017-09-01 10:30:43 -07:00
i915_trace_points.c
…
i915_utils.h drm/i915: Store a direct lookup from object handle to vma 2017-06-16 16:54:04 +01:00
i915_vgpu.c drm/i915: Enable guest i915 full ppgtt functionality 2017-08-15 10:12:48 +08:00
i915_vgpu.h drm/i915: Enable guest i915 full ppgtt functionality 2017-08-15 10:12:48 +08:00
i915_vma.c drm/i915: Replace execbuf vma ht with an idr 2017-08-18 11:59:02 +01:00
i915_vma.h drm/i915: Ignore duplicate VMA stored within the per-object handle LUT 2017-08-30 12:17:22 -07:00
intel_acpi.c ACPI: Switch to use generic guid_t in acpi_evaluate_dsm() 2017-06-07 12:20:49 +02:00
intel_atomic.c drm/i915/cnl: Fix Cannonlake scaler mode programing. 2017-06-12 09:45:55 -07:00
intel_atomic_plane.c drm/i915/skl+: Check for supported plane configuration in Interlace mode 2017-07-04 16:52:30 +03:00
intel_audio.c drm/i915: Reorganize intel_lpe_audio_notify() arguments 2017-05-03 16:20:48 +03:00
intel_bios.c drm/i915/vbt: ignore extraneous child devices for a port 2017-08-16 18:02:08 +03:00
intel_bios.h
…
intel_breadcrumbs.c drm/i915: Skip adding the request to the signal tree is complete 2017-06-08 12:33:08 +01:00
intel_cdclk.c drm/i915: reintroduce VLV/CHV PFI programming power domain workaround 2017-07-03 16:12:44 +03:00
intel_color.c drm/i915: Make i9xx_load_ycbcr_conversion_matrix() static 2017-09-01 10:30:37 -07:00
intel_crt.c drm: Nuke drm_atomic_helper_connector_dpms 2017-08-08 14:48:48 +02:00
intel_csr.c drm/i915: Use HAS_CSR instead of gen number on DMC load. 2017-06-12 09:45:30 -07:00
intel_ddi.c Linux 4.13-rc5 2017-08-15 16:16:58 +10:00
intel_device_info.c drm/i915: Use HAS_PCH_CPT() everywhere 2017-06-22 19:08:34 +03:00
intel_display.c drm/i915: Skip fence alignemnt check for the CCS plane 2017-08-30 12:08:20 -07:00
intel_dp.c drm/i915/edp: Increase T12 panel delay to 900 ms to fix DP AUX CH timeouts 2017-09-01 10:30:34 -07:00
intel_dp_aux_backlight.c Revert "drm/i915: Add heuristic to determine better way to adjust brightness" 2017-07-21 09:32:48 +03:00
intel_dp_link_training.c drm/i915: Explicit the connector name for DP link training result 2017-07-19 08:32:42 +02:00
intel_dp_mst.c drm/i915: Avoid null dereference if mst_port is unset. 2017-08-10 13:59:26 -07:00
intel_dpio_phy.c
…
intel_dpll_mgr.c drm/i915/cnl: Dump the right pll registers when dumping pipe config. 2017-08-11 11:41:45 -07:00
intel_dpll_mgr.h drm/i915/cnl: Initialize PLLs 2017-06-12 09:42:18 -07:00
intel_drv.h drm/i915/edp: Allow alternate fixed mode for eDP if available. 2017-08-15 16:43:33 -07:00
intel_dsi.c drm/i915/edp: Allow alternate fixed mode for eDP if available. 2017-08-15 16:43:33 -07:00
intel_dsi.h drm/i915/dsi: arrange intel_dsi.h according to relevant files 2017-03-07 15:18:43 +02:00
intel_dsi_dcs_backlight.c drm/i915: Initialize 'data' in intel_dsi_dcs_backlight.c 2017-08-16 18:02:00 +03:00
intel_dsi_pll.c
…
intel_dsi_vbt.c drm/i915/bxt: use NULL for GPIO connection ID 2017-08-21 11:52:29 +03:00
intel_dvo.c drm/i915/edp: Allow alternate fixed mode for eDP if available. 2017-08-15 16:43:33 -07:00
intel_engine_cs.c drm/i915: Move idle checks before intel_engine_init_global_seqno() 2017-07-27 09:38:46 +02:00
intel_fbc.c drm/i915: Quietly cancel FBC activation if CRTC is turned off before worker 2017-08-30 12:08:07 -07:00
intel_fbdev.c Merge airlied/drm-next into drm-intel-next-queued 2017-08-10 18:12:01 +02:00
intel_fifo_underrun.c drm/i915: Fix enum pipe vs. enum transcoder for the PCH transcoder 2017-09-01 10:30:43 -07:00
intel_frontbuffer.c
…
intel_frontbuffer.h
…
intel_guc_ct.c drm/i915/guc: Introduce buffer based cmd transport 2017-05-26 13:26:53 +01:00
intel_guc_ct.h drm/i915/guc: Introduce buffer based cmd transport 2017-05-26 13:26:53 +01:00
intel_guc_fwif.h drm/i915/guc: Introduce buffer based cmd transport 2017-05-26 13:26:53 +01:00
intel_guc_loader.c drm/i915/guc: Load GuC on Coffee Lake 2017-06-09 11:56:53 -07:00
intel_guc_log.c drm/i915: Treat WC a separate cache domain 2017-04-12 12:35:17 +01:00
intel_gvt.c drm/i915/gvt: Extend KBL platform support in GVT-g 2017-07-25 12:39:41 +08:00
intel_gvt.h drm/i915/gvt: Add gvt options sanitize function 2017-05-30 15:59:47 +03:00
intel_hangcheck.c drm/i915: Check execlist/ring status during hangcheck 2017-07-27 09:38:45 +02:00
intel_hdmi.c drm/i915: Split pin mapping into per platform functions 2017-08-17 18:01:39 -03:00
intel_hotplug.c drm/i915: Introduce intel_hpd_pin function. 2017-08-11 11:53:47 -07:00
intel_huc.c drm/i915/huc: Load HuC on Coffee Lake 2017-06-09 11:57:16 -07:00
intel_i2c.c drm/i915: Make i2c lock ops static 2017-09-01 10:30:40 -07:00
intel_lpe_audio.c drm/i915: Stop pretending to mask/unmask LPE audio interrupts 2017-05-26 11:51:18 +03:00
intel_lrc.c main drm pull request for 4.14 merge window 2017-09-03 17:02:26 -07:00
intel_lrc.h drm/i915: remove unused function declaration 2017-08-14 19:27:59 +03:00
intel_lspcon.c drm/i915/cnl: Fix LSPCON support. 2017-08-16 18:02:13 +03:00
intel_lvds.c drm/i915/edp: Allow alternate fixed mode for eDP if available. 2017-08-15 16:43:33 -07:00
intel_mocs.c drm/i915/cnl: Cannonlake has same MOCS table than Skylake. 2017-06-07 07:29:51 -07:00
intel_mocs.h
…
intel_modes.c
…
intel_opregion.c drm/i915/opregion: let user specify override VBT via firmware load 2017-08-17 16:34:54 +03:00
intel_overlay.c drm/i915: More surgically unbreak the modeset vs reset deadlock 2017-08-14 17:03:36 +02:00
intel_panel.c drm/i915/edp: Allow alternate fixed mode for eDP if available. 2017-08-15 16:43:33 -07:00
intel_pipe_crc.c drm/i915: use memdup_user_nul 2017-05-08 09:28:39 +02:00
intel_pm.c drm/i915/gen10: implement gen 10 watermarks calculations 2017-08-16 07:42:36 -07:00
intel_psr.c drm/i915/psr: Preserve SRD_CTL bit 29 on PSR init 2017-08-09 10:48:36 -07:00
intel_renderstate.h
…
intel_renderstate_gen6.c
…
intel_renderstate_gen7.c
…
intel_renderstate_gen8.c
…
intel_renderstate_gen9.c drm/i915/gen9: Send all components in VF state 2017-08-14 12:15:49 +03:00
intel_ringbuffer.c drm/i915: Enforce that CS packets are qword aligned 2017-07-27 09:38:57 +02:00
intel_ringbuffer.h drm/i915: Don't use MI_STORE_DWORD_IMM on Sandybridge/vcs 2017-08-18 11:55:02 +01:00
intel_runtime_pm.c drm/i915/hsw+: Add support for multiple power well regs 2017-08-15 15:28:10 +03:00
intel_sdvo.c drm/i915: Make i2c lock ops static 2017-09-01 10:30:40 -07:00
intel_sdvo_regs.h
…
intel_sideband.c
…
intel_sprite.c drm/i915: make structure intel_sprite_plane_funcs static 2017-08-11 18:06:19 +02:00
intel_tv.c drm: Nuke drm_atomic_helper_connector_dpms 2017-08-08 14:48:48 +02:00
intel_uc.c drm/i915/guc: Rename GuC irq trigger function 2017-08-12 18:56:47 +01:00
intel_uc.h Linux 4.12-rc5 2017-06-16 13:58:27 +10:00
intel_uncore.c drm/i915: Stop touching forcewake following a gen6+ engine reset 2017-08-18 10:05:59 +01:00
intel_uncore.h drm/i915: Keep the forcewake timer alive for 1ms past the most recent use 2017-05-26 15:58:21 +01:00
intel_vbt_defs.h
…