linux-kernel - Re: [PULL] modules-next

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Message-ID: <CA+55aFxS_JuFE+RM8cjeLx5tXu8XJVznfyrD4MSUqV85gPfx0w@mail.gmail.com>
Date:	Thu, 18 Dec 2014 21:01:22 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Ionut Alexa <ionut.m.alexa@...il.com>,
	Kees Cook <keescook@...omium.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PULL] modules-next

On Thu, Dec 18, 2014 at 4:55 PM, Rusty Russell <rusty@...tcorp.com.au> wrote:
>
> The exciting thing here is the getting rid of stop_machine on module
> removal.  This is possible by using a simple atomic_t for the counter,
> rather than our fancy per-cpu counter: it turns out that no one is doing
> a module increment per net packet, so the slowdown should be in the noise.

Famous last words. It may not happen per-packet, but I see
module_get() in various block drivers and in netfilter code etc, and
some of them may be pretty bad.

Let's see how it all works out.

                       Linus
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