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

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Date:   Fri, 10 Feb 2017 07:47:16 +0000
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Cc:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH] proc/sysctl: prune stale dentries during unregistering

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?