linux-kernel - [PATCH 0/1] rcu: uninline rcu_read_lock

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Message-ID: <20140702185915.GA18357@redhat.com>
Date:	Wed, 2 Jul 2014 20:59:15 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Josh Triplett <josh@...htriplett.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/1] rcu: uninline rcu_read_lock_held()

On 07/02, Oleg Nesterov wrote:
>
> And this naturally suggests that rcu_read_lock_held() should be uninlined
> too (and rcu_read_lock_sched_held(), but this needs another patch).
>
> But I still can't understand the difference reported by "size vmlinux",
>
> 	- 5541731 3014560 14757888 23314179
> 	+ 5513182 3026848 14757888 23297918
>
> it removes 28K from .text, but somehow it adds 12K to .data. I do not
> see any difference in .data when I compare individual .o files before/
> after this patch.

OK, it doesn't add to .data. This is because of INIT_TASK_DATA(THREAD_SIZE)
in vmlinux.lds.S, see the changelog.

If you think this makes sense I will will spam you again. We can also
uninline rcu_read_lock_sched_held(), mostly for consistency. But this
needs a separate change.

Oleg.

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