linux-kernel - Re: [PATCH 6/8] rbtree: Implement generic latch

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Message-ID: <20150319221249.GU2896@worktop.programming.kicks-ass.net>
Date:	Thu, 19 Mar 2015 23:12:49 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, mingo@...nel.org,
	rusty@...tcorp.com.au, mathieu.desnoyers@...icios.com,
	oleg@...hat.com, paulmck@...ux.vnet.ibm.com,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	andi@...stfloor.org, tglx@...utronix.de,
	Michel Lespinasse <walken@...gle.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	David Woodhouse <David.Woodhouse@...el.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 6/8] rbtree: Implement generic latch_tree

On Thu, Mar 19, 2015 at 05:36:36PM -0400, Steven Rostedt wrote:
> On Thu, 19 Mar 2015 13:58:33 -0700
> Andrew Morton <akpm@...ux-foundation.org> wrote:
> 
> > OK.  This code is basically required to support perf/ftrace and
> > modules, yes?  Presumably small and space-constrained systems aren't
> > using either, so they don't take the hit.
> > 
> > However CONFIG_MODULES systems which aren't using perf/ftrace _do_ take
> > a hit.  How many systems are we talking here?  All non-x86?
> 
> Compromise... (Totally untested)

It only makes sense to out-of-line __lt_insert() (to avoid it being
inlined twice). And for that we can create an instantiation macro such
that it can still inline the comparison.
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