linux-kernel - TREE_SRCU slows hotplug by factor ~16

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Message-ID: <1493002089.4145.7.camel@gmx.de>
Date:   Mon, 24 Apr 2017 04:48:09 +0200
From:   Mike Galbraith <efault@....de>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: TREE_SRCU slows hotplug by factor ~16

Greetings,

Running Steven's hotplug stress script in tip w. CLASSIC_SRCU takes 55s
in my i4790 box, whereas TREE_SRCU takes over 16m.  (Master with the
same config does it in 39s.. but then lockdep isn't enabled in master)

	-Mike