linux-kernel - Re: [PATCH 5/5] perf core: Reduce perf event output overhead by new overflow handler

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Message-ID: <20160323100220.GX6344@twins.programming.kicks-ass.net>
Date:	Wed, 23 Mar 2016 11:02:20 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	mingo@...hat.com, linux-kernel@...r.kernel.org,
	He Kuang <hekuang@...wei.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Brendan Gregg <brendan.d.gregg@...il.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Zefan Li <lizefan@...wei.com>, pi3orama@....com
Subject: Re: [PATCH 5/5] perf core: Reduce perf event output overhead by new
 overflow handler

On Mon, Mar 14, 2016 at 09:59:45AM +0000, Wang Nan wrote:
> By creating onward and backward specific overflow handlers and setting
> them according to event's backward setting, normal sampling events
> don't need checking backward setting of an event any more.

The normal antonym of backward is forward. Onward does not indicate a
direction per se, its more a continuance or progression of a previously
set goal.

Also, just squash these last two patches together.