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drm/i915: wire up shrinkctl->nr_scanned

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shrink_slab() allows us to report back the number of objects we
successfully scanned (out of the target shrinkctl->nr_to_scan).  As
report the number of pages owned by each GEM object as a separate item
to the shrinker, we cannot precisely control the number of shrinker
objects we scan on each pass; and indeed may free more than requested.
If we fail to tell the shrinker about the number of objects we process,
it will continue to hold a grudge against us as any objects left
unscanned are added to the next reclaim -- and so we will keep on
"unfairly" shrinking our own slab in comparison to other slabs.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Chris Wilson <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Hillf Danton <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Shaohua Li <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: Pekka Enberg <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Chris Wilson 2017-09-06 16:19:30 -07:00 • committed by Linus Torvalds
commit 912d572d63
5 changed files with 24 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

4
drivers/gpu/drm/i915/i915_debugfs.c
View file

@ -4308,10 +4308,10 @@ i915_drop_caches_set(void *data, u64 val)
fs_reclaim_acquire(GFP_KERNEL);
if (val & DROP_BOUND)
i915_gem_shrink(dev_priv, LONG_MAX, I915_SHRINK_BOUND);
i915_gem_shrink(dev_priv, LONG_MAX, NULL, I915_SHRINK_BOUND);
if (val & DROP_UNBOUND)
i915_gem_shrink(dev_priv, LONG_MAX, I915_SHRINK_UNBOUND);
i915_gem_shrink(dev_priv, LONG_MAX, NULL, I915_SHRINK_UNBOUND);
if (val & DROP_SHRINK_ALL)
i915_gem_shrink_all(dev_priv);

1
drivers/gpu/drm/i915/i915_drv.h
View file

@ -3742,6 +3742,7 @@ i915_gem_object_create_internal(struct drm_i915_private *dev_priv,
/* i915_gem_shrinker.c */
unsigned long i915_gem_shrink(struct drm_i915_private *dev_priv,
unsigned long target,
unsigned long *nr_scanned,
unsigned flags);
#define I915_SHRINK_PURGEABLE 0x1
#define I915_SHRINK_UNBOUND 0x2

4
drivers/gpu/drm/i915/i915_gem.c
View file

@ -2354,7 +2354,7 @@ rebuild_st:
goto err_sg;
}
i915_gem_shrink(dev_priv, 2 * page_count, *s++);
i915_gem_shrink(dev_priv, 2 * page_count, NULL, *s++);
cond_resched();
/* We've tried hard to allocate the memory by reaping
@ -5015,7 +5015,7 @@ int i915_gem_freeze_late(struct drm_i915_private *dev_priv)
* the objects as well, see i915_gem_freeze()
*/
i915_gem_shrink(dev_priv, -1UL, I915_SHRINK_UNBOUND);
i915_gem_shrink(dev_priv, -1UL, NULL, I915_SHRINK_UNBOUND);
i915_gem_drain_freed_objects(dev_priv);
mutex_lock(&dev_priv->drm.struct_mutex);

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

@ -2062,7 +2062,7 @@ int i915_gem_gtt_prepare_pages(struct drm_i915_gem_object *obj,
*/
GEM_BUG_ON(obj->mm.pages == pages);
} while (i915_gem_shrink(to_i915(obj->base.dev),
obj->base.size >> PAGE_SHIFT,
obj->base.size >> PAGE_SHIFT, NULL,
I915_SHRINK_BOUND |
I915_SHRINK_UNBOUND |
I915_SHRINK_ACTIVE));

24
drivers/gpu/drm/i915/i915_gem_shrinker.c
View file

@ -136,6 +136,7 @@ static bool unsafe_drop_pages(struct drm_i915_gem_object *obj)
* i915_gem_shrink - Shrink buffer object caches
* @dev_priv: i915 device
* @target: amount of memory to make available, in pages
* @nr_scanned: optional output for number of pages scanned (incremental)
* @flags: control flags for selecting cache types
*
* This function is the main interface to the shrinker. It will try to release
@ -158,7 +159,9 @@ static bool unsafe_drop_pages(struct drm_i915_gem_object *obj)
*/
unsigned long
i915_gem_shrink(struct drm_i915_private *dev_priv,
unsigned long target, unsigned flags)
unsigned long target,
unsigned long *nr_scanned,
unsigned flags)
{
const struct {
struct list_head *list;
@ -169,6 +172,7 @@ i915_gem_shrink(struct drm_i915_private *dev_priv,
{ NULL, 0 },
}, *phase;
unsigned long count = 0;
unsigned long scanned = 0;
bool unlock;
if (!shrinker_lock(dev_priv, &unlock))
@ -249,6 +253,7 @@ i915_gem_shrink(struct drm_i915_private *dev_priv,
count += obj->base.size >> PAGE_SHIFT;
}
mutex_unlock(&obj->mm.lock);
scanned += obj->base.size >> PAGE_SHIFT;
}
}
list_splice_tail(&still_in_list, phase->list);
@ -261,6 +266,8 @@ i915_gem_shrink(struct drm_i915_private *dev_priv,
shrinker_unlock(dev_priv, unlock);
if (nr_scanned)
*nr_scanned += scanned;
return count;
}
@ -283,7 +290,7 @@ unsigned long i915_gem_shrink_all(struct drm_i915_private *dev_priv)
unsigned long freed;
intel_runtime_pm_get(dev_priv);
freed = i915_gem_shrink(dev_priv, -1UL,
freed = i915_gem_shrink(dev_priv, -1UL, NULL,
I915_SHRINK_BOUND |
I915_SHRINK_UNBOUND |
I915_SHRINK_ACTIVE);
@ -329,23 +336,28 @@ i915_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
unsigned long freed;
bool unlock;
sc->nr_scanned = 0;
if (!shrinker_lock(dev_priv, &unlock))
return SHRINK_STOP;
freed = i915_gem_shrink(dev_priv,
sc->nr_to_scan,
&sc->nr_scanned,
I915_SHRINK_BOUND |
I915_SHRINK_UNBOUND |
I915_SHRINK_PURGEABLE);
if (freed < sc->nr_to_scan)
freed += i915_gem_shrink(dev_priv,
sc->nr_to_scan - freed,
sc->nr_to_scan - sc->nr_scanned,
&sc->nr_scanned,
I915_SHRINK_BOUND |
I915_SHRINK_UNBOUND);
if (freed < sc->nr_to_scan && current_is_kswapd()) {
intel_runtime_pm_get(dev_priv);
freed += i915_gem_shrink(dev_priv,
sc->nr_to_scan - freed,
sc->nr_to_scan - sc->nr_scanned,
&sc->nr_scanned,
I915_SHRINK_ACTIVE |
I915_SHRINK_BOUND |
I915_SHRINK_UNBOUND);
@ -354,7 +366,7 @@ i915_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
shrinker_unlock(dev_priv, unlock);
return freed;
return sc->nr_scanned ? freed : SHRINK_STOP;
}
static bool
@ -453,7 +465,7 @@ i915_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr
goto out;
intel_runtime_pm_get(dev_priv);
freed_pages += i915_gem_shrink(dev_priv, -1UL,
freed_pages += i915_gem_shrink(dev_priv, -1UL, NULL,
I915_SHRINK_BOUND |
I915_SHRINK_UNBOUND |
I915_SHRINK_ACTIVE |