linux-kernel - Re: [RFC][PATCH 00/13] percpu rwsem -v2

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Message-ID: <20150623162146.GC3644@twins.programming.kicks-ass.net>
Date:	Tue, 23 Jun 2015 18:21:46 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Davidlohr Bueso <dave@...olabs.net>
Cc:	oleg@...hat.com, paulmck@...ux.vnet.ibm.com, tj@...nel.org,
	mingo@...hat.com, linux-kernel@...r.kernel.org, der.herr@...r.at,
	riel@...hat.com, viro@...IV.linux.org.uk,
	torvalds@...ux-foundation.org
Subject: Re: [RFC][PATCH 00/13] percpu rwsem -v2

On Tue, Jun 23, 2015 at 09:10:03AM -0700, Davidlohr Bueso wrote:
> On Mon, 2015-06-22 at 14:16 +0200, Peter Zijlstra wrote:
> > This series converts the cpu hotplug lock into a percpu-rwsem to provide a 3rd
> > user.
> 
> Curious, why not also mem hotplug? It seems to use the exact same
> locking mayhem than cpu.

Because it looks like they 'forgot' to copy the notifiers and therefore
I suspect we could simplify things. We might not need the recursive
nonsense.

But I've not yet actually looked at it much.

I was indeed greatly saddened that these people copied cpu hotplug;
clearly they had not gotten the memo that cpu hotplug is a trainwreck.
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