btrfs: preallocate radix tree node for readahead

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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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David Sterba 2017-03-02 18:54:52 +01:00

parent 261cc2cca0

commit cc8385b59e

2 changed files with 8 additions and 1 deletions

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7

fs/btrfs/reada.c

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2

fs/btrfs/volumes.c

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