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Chris Wilson 606fec956c drm/i915: Prefer random replacement before eviction search 
Performing an eviction search can be very, very slow especially for a
range restricted replacement. For example, a workload like
gem_concurrent_blit will populate the entire GTT and then cause aperture
thrashing. Since the GTT is a mix of active and inactive tiny objects,
we have to search through almost 400k objects before finding anything
inside the mappable region, and as this search is required before every
operation performance falls off a cliff.

Instead of performing the full search, we do a trial replacement of the
node at a random location fitting the specified restrictions. We lose
the strict LRU property of the GTT in exchange for avoiding the slow
search (several orders of runtime improvement for gem_concurrent_blit
4KiB-global-gtt, e.g. from 5000s to 20s). The loss of LRU replacement is
(later) mitigated firstly by only doing replacement if we find no
freespace and secondly by execbuf doing a PIN_NONBLOCK search first before
it starts thrashing (i.e. the random replacement will only occur from the
already inactive set of objects).

v2: Ascii-art, and check preconditionst
v3: Rephrase final sentence in comment to explain why we don't bother
with if (i915_is_ggtt(vm)) for preferring random replacement.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170111112312.31493-3-chris@chris-wilson.co.uk
 		2017-01-11 12:28:37 +00:00
..
amd Merge tag 'drm-misc-next-2017-01-09' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-01-10 08:06:56 +10:00
arc drm: bridge: Link encoder and bridge in core code 2016-12-18 16:31:45 +05:30
arm drm: Nuke fb->pixel_format 2016-12-15 14:55:34 +02:00
armada Merge tag 'drm-misc-next-2017-01-09' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-01-10 08:06:56 +10:00
ast Merge tag 'drm-misc-next-2017-01-09' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-01-10 08:06:56 +10:00
atmel-hlcdc drm: bridge: Link encoder and bridge in core code 2016-12-18 16:31:45 +05:30
bochs drm: fix compilations issues introduced by "drm: allow to use mmuless SoC" 2017-01-09 11:30:30 +01:00
bridge drm: bridge: Link encoder and bridge in core code 2016-12-18 16:31:45 +05:30
cirrus drm: fix compilations issues introduced by "drm: allow to use mmuless SoC" 2017-01-09 11:30:30 +01:00
etnaviv Merge tag 'drm-misc-next-2017-01-09' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-01-10 08:06:56 +10:00
exynos Merge tag 'drm-misc-next-2017-01-09' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-01-10 08:06:56 +10:00
fsl-dcu drm: Change the return type of the unload hook to void 2017-01-09 11:25:22 +01:00
gma500 Merge tag 'drm-misc-next-2017-01-09' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-01-10 08:06:56 +10:00
hisilicon drm: fix compilations issues introduced by "drm: allow to use mmuless SoC" 2017-01-09 11:30:30 +01:00
i2c drm/i2c: tda998x: fix spelling mistake 2016-11-18 00:00:40 +00:00
i810 drm: define drm_compat_ioctl NULL on CONFIG_COMPAT=n and reduce #ifdefs 2016-11-02 11:33:47 -04:00
i915 drm/i915: Prefer random replacement before eviction search 2017-01-11 12:28:37 +00:00
imx drm/imx: imx-tve: Remove unused variable 2017-01-05 09:44:20 +01:00
lib drm: Add a simple generator of random permutations 2016-12-27 12:34:00 +01:00
mediatek drm: bridge: Link encoder and bridge in core code 2016-12-18 16:31:45 +05:30
meson drm: Nuke fb->pixel_format 2016-12-15 14:55:34 +02:00
mga drm: Change the return type of the unload hook to void 2017-01-09 11:25:22 +01:00
mgag200 drm: fix compilations issues introduced by "drm: allow to use mmuless SoC" 2017-01-09 11:30:30 +01:00
msm Merge tag 'drm-misc-next-2017-01-09' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-01-10 08:06:56 +10:00
mxsfb drm: Nuke fb->pixel_format 2016-12-15 14:55:34 +02:00
nouveau Merge tag 'drm-misc-next-2017-01-09' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-01-10 08:06:56 +10:00
omapdrm Merge tag 'drm-misc-next-2017-01-09' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-01-10 08:06:56 +10:00
panel drm/panel: simple: Add support for AUO G185HAN01 2016-12-06 17:06:32 +01:00
qxl drm: fix compilations issues introduced by "drm: allow to use mmuless SoC" 2017-01-09 11:30:30 +01:00
r128
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radeon Merge tag 'drm-misc-next-2017-01-09' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-01-10 08:06:56 +10:00
rcar-du drm: bridge: Link encoder and bridge in core code 2016-12-18 16:31:45 +05:30
rockchip drm: rockchip: use crtc helper drm_crtc_from_index() 2016-12-30 12:15:11 +01:00
savage drm: Change the return type of the unload hook to void 2017-01-09 11:25:22 +01:00
selftests drm/mm: Convert to drm_printer 2016-12-30 12:08:28 +01:00
shmobile drm: Change the return type of the unload hook to void 2017-01-09 11:25:22 +01:00
sis drm: Change the return type of the unload hook to void 2017-01-09 11:25:22 +01:00
sti drm: bridge: Link encoder and bridge in core code 2016-12-18 16:31:45 +05:30
sun4i drm: bridge: Link encoder and bridge in core code 2016-12-18 16:31:45 +05:30
tdfx drm: define drm_compat_ioctl NULL on CONFIG_COMPAT=n and reduce #ifdefs 2016-11-02 11:33:47 -04:00
tegra Merge tag 'drm-misc-next-2017-01-09' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-01-10 08:06:56 +10:00
tilcdc Merge tag 'drm-misc-next-2017-01-09' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-01-10 08:06:56 +10:00
ttm Merge tag 'drm-misc-next-2017-01-09' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-01-10 08:06:56 +10:00
udl Merge tag 'drm-misc-next-2017-01-09' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-01-10 08:06:56 +10:00
vc4 drm: Don't include <drm/drm_encoder.h> in <drm/drm_crtc.h> 2016-12-18 16:29:29 +05:30
vgem mm: use vmf->address instead of of vmf->virtual_address 2016-12-14 16:04:09 -08:00
via drm: Change the return type of the unload hook to void 2017-01-09 11:25:22 +01:00
virtio Merge tag 'drm-misc-next-2017-01-09' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-01-10 08:06:56 +10:00
vmwgfx drm: fix compilations issues introduced by "drm: allow to use mmuless SoC" 2017-01-09 11:30:30 +01:00
zte drm: zte: use crtc helper drm_crtc_from_index() 2016-12-30 12:15:01 +01:00
Kconfig drm: fix compilations issues introduced by "drm: allow to use mmuless SoC" 2017-01-09 11:30:30 +01:00
Makefile drm: compile drm_vm.c only when needed 2017-01-06 11:03:07 +01:00
ati_pcigart.c
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drm_agpsupport.c
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drm_atomic.c drm: Add kernel-doc for drm_crtc_commit_get/put 2017-01-05 08:55:02 +01:00
drm_atomic_helper.c drm: reference count event->completion 2017-01-04 11:03:06 +01:00
drm_auth.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_blend.c drm: RIP mode_config->rotation_property 2016-10-22 10:42:11 +02:00
drm_bridge.c drm/bridge: Use recommened kerneldoc for struct member refs 2017-01-02 09:17:26 +01:00
drm_bufs.c
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drm_cache.c
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drm_color_mgmt.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_connector.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_context.c
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drm_crtc.c drm: add more document for drm_crtc_from_index() 2017-01-09 11:24:16 +01:00
drm_crtc_helper.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_crtc_helper_internal.h
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drm_crtc_internal.h drm: Move atomic debugfs functions into drm_crtc_internal.h 2016-12-18 14:18:12 +01:00
drm_debugfs.c drm: Move atomic debugfs functions into drm_crtc_internal.h 2016-12-18 14:18:12 +01:00
drm_debugfs_crc.c drm: crc: Call wake_up_interruptible() each time there is a new CRC entry 2017-01-06 15:23:19 +01:00
drm_dma.c
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drm_dp_aux_dev.c
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drm_dp_dual_mode_helper.c drm: Print some debug/error info during DP dual mode detect 2016-10-26 15:57:11 -04:00
drm_dp_helper.c
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drm_dp_mst_topology.c drm/dp/mst: Check peer device type before attempting EDID read 2016-10-26 18:53:44 +02:00
drm_drv.c drm: Avoid NULL dereference of drm_device.dev 2016-12-30 15:29:44 +01:00
drm_dumb_buffers.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_edid.c drm/edid: constify edid quirk list 2017-01-02 15:06:39 +02:00
drm_edid_load.c
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drm_encoder.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_encoder_slave.c
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drm_fb_cma_helper.c drm/cma-helpers: Use recommened kerneldoc for struct member refs 2016-12-30 17:58:15 +01:00
drm_fb_helper.c drm: remove useless parameters from drm_pick_cmdline_mode function 2017-01-09 11:18:41 +01:00
drm_flip_work.c
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drm_fops.c drm: reference count event->completion 2017-01-04 11:03:06 +01:00
drm_fourcc.c drm: move allocation out of drm_get_format_name() 2016-11-12 14:19:38 +01:00
drm_framebuffer.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_gem.c
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drm_gem_cma_helper.c drm: allow to use mmuless SoC 2017-01-06 11:04:54 +01:00
drm_global.c drm: Update TTM initialization documentation 2016-12-30 12:52:10 +01:00
drm_hashtab.c
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drm_info.c
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drm_internal.h drm/irq: drm_legacy_ prefix for legacy ioctls 2016-12-18 14:18:12 +01:00
drm_ioc32.c
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drm_ioctl.c drm: Export drm_ioctl_permit to kernel-doc 2016-12-30 12:40:48 +01:00
drm_irq.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_kms_helper_common.c
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drm_legacy.h drm: compile drm_vm.c only when needed 2017-01-06 11:03:07 +01:00
drm_lock.c drm: Avoid NULL dereference for DRM_LEGACY debug message 2016-11-28 08:39:41 +01:00
drm_memory.c
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drm_mipi_dsi.c
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drm_mm.c drm/mm: Some doc polish 2016-12-30 12:53:51 +01:00
drm_mode_config.c drm: Clean up connectors by unreferencing them 2016-12-18 14:33:51 +01:00
drm_mode_object.c drm: Get atomic property value even if DRIVER_ATOMIC is not set 2016-12-27 10:44:33 +01:00
drm_modes.c Revert "drm: Add aspect ratio parsing in DRM layer" 2016-11-15 15:01:42 +01:00
drm_modeset_helper.c drm: Convert all helpers to drm_connector_list_iter 2016-12-18 14:33:22 +01:00
drm_modeset_lock.c drm/doc: Fix indenting in drm_modeset_lock.c comment 2016-11-29 23:34:36 +01:00
drm_of.c drm: Don't include <drm/drm_encoder.h> in <drm/drm_crtc.h> 2016-12-18 16:29:29 +05:30
drm_panel.c
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drm_pci.c drm: Deduplicate driver initialization message 2016-12-30 12:37:39 +01:00
drm_plane.c drm: add more document for drm_crtc_from_index() 2017-01-09 11:24:16 +01:00
drm_plane_helper.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_platform.c drm: Deduplicate driver initialization message 2016-12-30 12:37:39 +01:00
drm_prime.c drm: Take ownership of the dmabuf->obj when exporting 2016-12-08 10:29:22 +01:00
drm_print.c drm/printer: add debug printer 2016-12-30 11:43:40 +01:00
drm_probe_helper.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_property.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_rect.c drm/rect: Fix formatting of example code 2016-12-30 13:35:54 +01:00
drm_scatter.c
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drm_simple_kms_helper.c drm/doc: use preferred struct reference in kernel-doc 2016-12-30 13:34:59 +01:00
drm_sysfs.c
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drm_trace.h
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drm_trace_points.c
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drm_vm.c mm: use vmf->address instead of of vmf->virtual_address 2016-12-14 16:04:09 -08:00
drm_vma_manager.c
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