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drm/i915: Allocate active tracking nodes from a slabcache

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Wrap the active tracking for a GPU references in a slabcache for faster
allocations, and hopefully better fragmentation reduction.

v3: Nothing device specific left, it's just a slabcache that we can
make global.
v4: Include i915_active.h and don't put the initfunc under DEBUG_GEM

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/20190205130005.2807-4-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-02-05 13:00:04 +00:00
parent a42375af0a
commit 5f5c139d69
3 changed files with 35 additions and 3 deletions
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31
drivers/gpu/drm/i915/i915_active.c
View File

@ -9,6 +9,17 @@
#define BKL(ref) (&(ref)->i915->drm.struct_mutex)
/*
* Active refs memory management
*
* To be more economical with memory, we reap all the i915_active trees as
* they idle (when we know the active requests are inactive) and allocate the
* nodes from a local slab cache to hopefully reduce the fragmentation.
*/
static struct i915_global_active {
struct kmem_cache *slab_cache;
} global;
struct active_node {
struct i915_gem_active base;
struct i915_active *ref;
@ -23,7 +34,7 @@ __active_park(struct i915_active *ref)
rbtree_postorder_for_each_entry_safe(it, n, &ref->tree, node) {
GEM_BUG_ON(i915_gem_active_isset(&it->base));
kfree(it);
kmem_cache_free(global.slab_cache, it);
}
ref->tree = RB_ROOT;
}
@ -96,11 +107,11 @@ active_instance(struct i915_active *ref, u64 idx)
p = &parent->rb_left;
}
node = kmalloc(sizeof(*node), GFP_KERNEL);
node = kmem_cache_alloc(global.slab_cache, GFP_KERNEL);
/* kmalloc may retire the ref->last (thanks shrinker)! */
if (unlikely(!i915_gem_active_raw(&ref->last, BKL(ref)))) {
kfree(node);
kmem_cache_free(global.slab_cache, node);
goto out;
}
@ -239,3 +250,17 @@ void i915_active_fini(struct i915_active *ref)
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
#include "selftests/i915_active.c"
#endif
int __init i915_global_active_init(void)
{
global.slab_cache = KMEM_CACHE(active_node, SLAB_HWCACHE_ALIGN);
if (!global.slab_cache)
return -ENOMEM;
return 0;
}
void __exit i915_global_active_exit(void)
{
kmem_cache_destroy(global.slab_cache);
}

3
drivers/gpu/drm/i915/i915_active.h
View File

@ -70,4 +70,7 @@ void i915_active_fini(struct i915_active *ref);
static inline void i915_active_fini(struct i915_active *ref) { }
#endif
int i915_global_active_init(void);
void i915_global_active_exit(void);
#endif /* _I915_ACTIVE_H_ */

4
drivers/gpu/drm/i915/i915_pci.c
View File

@ -26,6 +26,7 @@
#include <linux/vgaarb.h>
#include <linux/vga_switcheroo.h>
#include "i915_active.h"
#include "i915_drv.h"
#include "i915_selftest.h"
@ -798,6 +799,8 @@ static int __init i915_init(void)
bool use_kms = true;
int err;
i915_global_active_init();
err = i915_mock_selftests();
if (err)
return err > 0 ? 0 : err;
@ -829,6 +832,7 @@ static void __exit i915_exit(void)
return;
pci_unregister_driver(&i915_pci_driver);
i915_global_active_exit();
}
module_init(i915_init);