drm/i915: Make request allocation caches global
authorChris Wilson <chris@chris-wilson.co.uk>
Thu, 28 Feb 2019 10:20:33 +0000 (10:20 +0000)
committerChris Wilson <chris@chris-wilson.co.uk>
Thu, 28 Feb 2019 11:07:56 +0000 (11:07 +0000)
commit32eb6bcfdda9dad240cf6a22fda2b3418b1a1b8e
treeb8d37fcf09299b0f0edd9317479336e04a921156
parentbd2be1418659abd7b1cdecc7d23d86314b0e3496
drm/i915: Make request allocation caches global

As kmem_caches share the same properties (size, allocation/free behaviour)
for all potential devices, we can use global caches. While this
potential has worse fragmentation behaviour (one can argue that
different devices would have different activity lifetimes, but you can
also argue that activity is temporal across the system) it is the
default behaviour of the system at large to amalgamate matching caches.

The benefit for us is much reduced pointer dancing along the frequent
allocation paths.

v2: Defer shrinking until after a global grace period for futureproofing
multiple consumers of the slab caches, similar to the current strategy
for avoiding shrinking too early.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190228102035.5857-1-chris@chris-wilson.co.uk
19 files changed:
drivers/gpu/drm/i915/Makefile
drivers/gpu/drm/i915/i915_active.c
drivers/gpu/drm/i915/i915_active.h
drivers/gpu/drm/i915/i915_drv.h
drivers/gpu/drm/i915/i915_gem.c
drivers/gpu/drm/i915/i915_globals.c [new file with mode: 0644]
drivers/gpu/drm/i915/i915_globals.h [new file with mode: 0644]
drivers/gpu/drm/i915/i915_pci.c
drivers/gpu/drm/i915/i915_request.c
drivers/gpu/drm/i915/i915_request.h
drivers/gpu/drm/i915/i915_scheduler.c
drivers/gpu/drm/i915/i915_scheduler.h
drivers/gpu/drm/i915/intel_guc_submission.c
drivers/gpu/drm/i915/intel_lrc.c
drivers/gpu/drm/i915/intel_ringbuffer.h
drivers/gpu/drm/i915/selftests/mock_engine.c
drivers/gpu/drm/i915/selftests/mock_gem_device.c
drivers/gpu/drm/i915/selftests/mock_request.c
drivers/gpu/drm/i915/selftests/mock_request.h