Re: [PATCH] proc/sysctl: prune stale dentries during unregistering

From: Al Viro
Date: Fri Feb 10 2017 - 02:49:11 EST

On Fri, Feb 10, 2017 at 10:35:02AM +0300, Konstantin Khlebnikov wrote:

> # time sysctl -a > /dev/null
> real 1m12.806s
> user 0m0.016s
> sys 1m12.400s
> Currently only memory reclaimer could remove this garbage.
> But without significant memory pressure this never happens.
> This patch collects sysctl inodes into list on sysctl table header and
> prunes all their dentries once that table unregisters.

I'd probably go for hlist, but that's mostly cosmetic difference; how about
the matching stats *after* that patch?