linux-kernel - Re: [PATCH] v3 RCU: the bloatwatch edition

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Message-ID: <1454.1240954799@redhat.com>
Date:	Tue, 28 Apr 2009 22:39:59 +0100
From:	David Howells <dhowells@...hat.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	dhowells@...hat.com, linux-kernel@...r.kernel.org, mingo@...e.hu,
	akpm@...ux-foundation.org, niv@...ibm.com, dvhltc@...ibm.com,
	lethal@...ux-sh.org, kernel@...tstofly.org, matthew@....cx
Subject: Re: [PATCH] v3 RCU: the bloatwatch edition

Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:

> Your thought is that some of the functions could be moved to tinyrcu.h?
> Indeed, some of them would be smaller if inlined than even the call
> sequence.  For example, rcu_needs_cpu() should remove code from the
> dynticks implementation given that it always returns zero.

tinyrcu.h is probably not a bad idea.  Some of the functions are trivial, and
the code to do a function call is bigger than the body of the function itself.

rcu_exit_nohz(), rcu_nmi_enter/exit(), rcu_batches_completed[_bh](), for
example.  Even call_rcu() and call_rcu_bh() might perhaps benefit from
inlining.

David
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