linux-kernel - Re: [PATCH v2 0/3] Teach perf_trace_##call() to check hlist_empty(perf

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Message-ID: <20130812174515.GA14359@redhat.com>
Date:	Mon, 12 Aug 2013 19:45:15 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	David Ahern <dsahern@...il.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/3] Teach perf_trace_##call() to check
	hlist_empty(perf_events)

On 08/12, Peter Zijlstra wrote:
>
> So I suppose the down-side to putting them in TP_ARGS() is that you
> cannot use arbitrary expressions for them anymore; like:
>
>   TP_ARGS(foo);
>
>   TP_perf_assign(
>     __perf_task(foo->ponies);
>     __perf_count(foo->horses);
>   ),
>
> Not that we actually did something like that, but I imagine it might've
> been useful..

Yes. This is of course less generic. And more confusing, I agree.

> A well, lets not worry too much about that and go with
> this. We'll get creative again if we ever need something like that.
>
> Acked-by: Peter Zijlstra <peterz@...radead.org>

Thanks ;)

BTW. Can't we kill __perf_addr() and the corresponding argument in
perf_trace_buf_submit/perf_tp_event ?

Or do you think it can have a new user?

Oleg.

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