Re: [PATCH 2/5] proc/sysctl: optimize proc_sys_readdir

[Luis Chamberlain]

On Fri, Feb 07, 2020 at 10:03:02AM -0800, Davidlohr Bueso wrote:
> This patch coverts struct ctl_dir to use an llrbtree
> instead of a regular rbtree such that computing nodes for
> potential usable entries becomes a branchless O(1) operation,
> therefore optimizing first_usable_entry(). The cost are
> mainly three additional pointers: one for the root and two
> for each struct ctl_node next/prev nodes, enlarging it from
> 32 to 48 bytes on x86-64.

Acked-by: Luis Chamberlain <mcgrof@xxxxxxxxxx>

  Luis