linux-kernel - Re: [RFC PATCH] ipc, mqueue: lazy call kern_mount

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Date:   Tue, 28 Nov 2017 13:53:16 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Giuseppe Scrivano <gscrivan@...hat.com>
Cc:     linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
        mingo@...nel.org, dave@...olabs.net
Subject: Re: [RFC PATCH] ipc, mqueue: lazy call kern_mount_data in new
 namespaces

On Mon, 27 Nov 2017 13:55:50 +0100 Giuseppe Scrivano <gscrivan@...hat.com> wrote:

> kern_mount_data is a relatively expensive operation when creating a
> new IPC namespace, so delay the mount until its first usage when not
> creating the the global namespace.
> 
> On my machine, the time for creating 1000 new IPC namespaces dropped
> from ~8s to ~2s.

OK, but this simply moves the expense so it happens later on.  Why is
that better?