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ttm: Optimize delayed buffer destruction.

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Don't walk through the delayed delete list completely on each try,
but stop after the first buffer with an unsignaled fence.

Signed-off-by: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
This commit is contained in:
Thomas Hellstrom 2009-03-22 17:36:10 +01:00
parent 145c81299d
commit 4455b5f532
1 changed files with 14 additions and 8 deletions
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22
linux-core/ttm/ttm_bo.c
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@ -380,10 +380,11 @@ static int ttm_bo_expire_sync_obj(struct ttm_buffer_object *bo,
* up the list_kref and schedule a delayed list check.
*/
static void ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
{
struct ttm_bo_device *bdev = bo->bdev;
struct ttm_bo_driver *driver = bdev->driver;
int ret;
mutex_lock(&bo->mutex);
@ -416,7 +417,7 @@ static void ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
while (put_count--)
kref_put(&bo->list_kref, ttm_bo_release_list);
return;
return 0;
}
spin_lock(&bdev->lru_lock);
@ -431,11 +432,13 @@ static void ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
spin_unlock(&bdev->lru_lock);
schedule_delayed_work(&bdev->wq,
((HZ / 100) < 1) ? 1 : HZ / 100);
} else
ret = 0;
} else {
spin_unlock(&bdev->lru_lock);
ret = -EBUSY;
}
mutex_unlock(&bo->mutex);
return;
return ret;
}
/**
@ -467,14 +470,15 @@ static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
kref_get(&entry->list_kref);
spin_unlock(&bdev->lru_lock);
ttm_bo_cleanup_refs(entry, remove_all);
ret = ttm_bo_cleanup_refs(entry, remove_all);
kref_put(&entry->list_kref, ttm_bo_release_list);
spin_lock(&bdev->lru_lock);
spin_lock(&bdev->lru_lock);
if (nentry) {
bool next_onlist = !list_empty(next);
spin_unlock(&bdev->lru_lock);
kref_put(&nentry->list_kref, ttm_bo_release_list);
spin_lock(&bdev->lru_lock);
/*
* Someone might have raced us and removed the
* next entry from the list. We don't bother restarting
@ -484,6 +488,8 @@ static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
if (!next_onlist)
break;
}
if (ret)
break;
}
ret = !list_empty(&bdev->ddestroy);
spin_unlock(&bdev->lru_lock);