linux-kernel - Re: [PATCH 2/6] RFC perf_counter: singleshot support

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Message-ID: <20090402181026.GA6340@elte.hu>
Date:	Thu, 2 Apr 2009 20:10:26 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Paul Mackerras <paulus@...ba.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] RFC perf_counter: singleshot support


* Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> OK, so I just remembered the sigio thing mentioned by Paul a while 
> back.
> 
> and this should do I suppose...

> @@ -1561,6 +1578,7 @@ void perf_counter_wakeup(struct perf_cou
>  	rcu_read_unlock();
>  
>  	wake_up_all(&counter->waitq);
> +	kill_fasync(&counter->fasync, SIGIO, POLL_IN);

ah, yes.

Do we even need the explicit signo method this way? The SIGIO target 
is configurable via fcntl(F_SETSIG), right?

	Ingo
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