linux-kernel - Re: [PATCH v2 net-next 03/10] perf: split perf_trace_buf

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Date:	Thu, 7 Apr 2016 22:58:00 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alexei Starovoitov <ast@...com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	"David S . Miller" <davem@...emloft.net>,
	Ingo Molnar <mingo@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Wang Nan <wangnan0@...wei.com>, Josef Bacik <jbacik@...com>,
	Brendan Gregg <brendan.d.gregg@...il.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-team@...com
Subject: Re: [PATCH v2 net-next 03/10] perf: split perf_trace_buf_prepare
 into alloc and update parts

On Wed, Apr 06, 2016 at 06:43:24PM -0700, Alexei Starovoitov wrote:
> split allows to move expensive update of 'struct trace_entry' to later phase.
> Repurpose unused 1st argument of perf_tp_event() to indicate event type.
> 
> While splitting use temp variable 'rctx' instead of '*rctx' to avoid
> unnecessary loads done by the compiler due to -fno-strict-aliasing
> 
> Signed-off-by: Alexei Starovoitov <ast@...nel.org>

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>