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Subject: Re: REGRESSION: Performance regressions from switching
 anon_vma->lock to mutex
From: Peter Zijlstra <peterz@infradead.org>
To: Shaohua Li <shaohua.li@intel.com>
Cc: Tim Chen <tim.c.chen@linux.intel.com>,
        Andrew Morton <akpm@linux-foundation.org>,
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        KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
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On Wed, 2011-06-15 at 13:52 +0200, Peter Zijlstra wrote:
> /me goes re-test without the sirq-rcu bits mixed in just to make sure.

I switched from PREEMPT=n to PREEMPT_VOLUNTARY=y, which seemed to make a
difference:

.39             257.651 messages/sec/core
-tip            254.976 messages/sec/core
    +linus      258.03  messages/sec/core
    +sirq       265.951 messages/sec/core


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