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btrfs: preallocate radix tree node for readahead
We can preallocate the node so insertion does not have to do that under the lock. The GFP flags for the per-device radix tree are initialized to GFP_NOFS & ~__GFP_DIRECT_RECLAIM but we can use GFP_KERNEL, same as an allocation above anyway, but also because readahead is optional and not on any critical writeout path. Reviewed-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
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2 changed files with 8 additions and 1 deletions
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@ -270,6 +270,12 @@ static struct reada_zone *reada_find_zone(struct btrfs_fs_info *fs_info,
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if (!zone)
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return NULL;
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ret = radix_tree_preload(GFP_KERNEL);
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if (ret) {
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kfree(zone);
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return NULL;
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}
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zone->start = start;
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zone->end = end;
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INIT_LIST_HEAD(&zone->list);
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@ -299,6 +305,7 @@ static struct reada_zone *reada_find_zone(struct btrfs_fs_info *fs_info,
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zone = NULL;
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}
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spin_unlock(&fs_info->reada_lock);
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radix_tree_preload_end();
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return zone;
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}
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@ -252,7 +252,7 @@ static struct btrfs_device *__alloc_device(void)
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atomic_set(&dev->reada_in_flight, 0);
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atomic_set(&dev->dev_stats_ccnt, 0);
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btrfs_device_data_ordered_init(dev);
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INIT_RADIX_TREE(&dev->reada_zones, GFP_NOFS & ~__GFP_DIRECT_RECLAIM);
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INIT_RADIX_TREE(&dev->reada_zones, GFP_KERNEL);
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INIT_RADIX_TREE(&dev->reada_extents, GFP_NOFS & ~__GFP_DIRECT_RECLAIM);
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return dev;
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