From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH v2 0/4] Utilization estimation (util_est) for FAIR tasks
Date: Wed, 13 Dec 2017 17:03:57 +0100
Message-ID: <20171213160357.3se4vvyo5lqud2uo@hirez.programming.kicks-ass.net>
References: <20171205171018.9203-1-patrick.bellasi@arm.com>
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To: Patrick Bellasi <patrick.bellasi@arm.com>
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On Tue, Dec 05, 2017 at 05:10:14PM +0000, Patrick Bellasi wrote:
> With this feature enabled, the measured overhead is in the range of ~1%
> on the same HW/SW test configuration.

That's quite a lot; did you look where that comes from?