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

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Message-ID: <87wp29l6h3.fsf@redhat.com>
Date:   Wed, 29 Nov 2017 11:33:28 +0100
From:   Giuseppe Scrivano <gscrivan@...hat.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
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

Andrew Morton <akpm@...ux-foundation.org> writes:

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

the optimization is for new IPC namespaces that don't use mq_open.  In
this case there won't be any kern_mount_data cost at all.

Regards,
Giuseppe