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drm/i915: Trim partial view sg lists

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Partial views are small but there can be many of them, and since the sg
list space for them is allocated pessimistically, we can save some slab by
trimming the unused tail entries.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180926080353.20867-1-tvrtko.ursulin@linux.intel.com
This commit is contained in:
Tvrtko Ursulin 2018-09-26 09:03:53 +01:00
parent dee4a0f8e7
commit f8e57863f8
3 changed files with 5 additions and 1 deletions
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2
drivers/gpu/drm/i915/i915_drv.h
View File

@ -2325,6 +2325,8 @@ static inline struct scatterlist *__sg_next(struct scatterlist *sg)
(((__iter).curr += PAGE_SIZE) >= (__iter).max) ? \
(__iter) = __sgt_iter(__sg_next((__iter).sgp), false), 0 : 0)
bool i915_sg_trim(struct sg_table *orig_st);
static inline unsigned int i915_sg_page_sizes(struct scatterlist *sg)
{
unsigned int page_sizes;

2
drivers/gpu/drm/i915/i915_gem.c
View File

@ -2491,7 +2491,7 @@ void __i915_gem_object_put_pages(struct drm_i915_gem_object *obj,
mutex_unlock(&obj->mm.lock);
}
static bool i915_sg_trim(struct sg_table *orig_st)
bool i915_sg_trim(struct sg_table *orig_st)
{
struct sg_table new_st;
struct scatterlist *sg, *new_sg;

2
drivers/gpu/drm/i915/i915_gem_gtt.c
View File

@ -3835,6 +3835,8 @@ intel_partial_pages(const struct i915_ggtt_view *view,
count -= len >> PAGE_SHIFT;
if (count == 0) {
sg_mark_end(sg);
i915_sg_trim(st); /* Drop any unused tail entries. */
return st;
}