SYNOPSIS

unsigned long i915_gem_shrink(struct drm_i915_private * dev_priv, unsigned long target, unsigned flags);

ARGUMENTS

dev_priv

i915 device

target

amount of memory to make available, in pages

flags

control flags for selecting cache types

DESCRIPTION

This function is the main interface to the shrinker. It will try to release up to target pages of main memory backing storage from buffer objects. Selection of the specific caches can be done with flags. This is e.g. useful when purgeable objects should be removed from caches preferentially.

Note that it's not guaranteed that released amount is actually available as free system memory - the pages might still be in-used to due to other reasons (like cpu mmaps) or the mm core has reused them before we could grab them. Therefore code that needs to explicitly shrink buffer objects caches (e.g. to avoid deadlocks in memory reclaim) must fall back to i915_gem_shrink_all.

Also note that any kind of pinning (both per-vma address space pins and backing storage pins at the buffer object level) result in the shrinker code having to skip the object.

RETURNS

The number of pages of backing storage actually released.

AUTHORS

Jesse Barnes <[email protected]>
Intel Corporation,         
        

Initial version

Laurent Pinchart <[email protected]>
Ideas on board SPRL,         
        

Driver internals

Daniel Vetter <[email protected]>
Intel Corporation,         
        

Contributions all over the place

Lukas Wunner <[email protected]>

vga_switcheroo documentation

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