linux-kernel - Re: [RFC v0 0/3] Simple wait queue support

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Message-ID: <20150806213649.GB16853@twins.programming.kicks-ass.net>
Date:	Thu, 6 Aug 2015 23:36:49 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Daniel Wagner <daniel.wagner@...-carit.de>,
	linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	bigeasy@...utronix.de, tglx@...utronix.de,
	paulmck@...ux.vnet.ibm.com
Subject: Re: [RFC v0 0/3] Simple wait queue support

On Thu, Aug 06, 2015 at 03:31:20PM -0400, Steven Rostedt wrote:
> > 4) poll_wait: currently it and poll_table_entry are both hard coupled
> >    to wait_queue_head_t -- so any users of poll_wait are not eligible
> >    for conversion to simple wait. (I just happened to notice that
> >    recently.)  A quick grep shows ~500 poll_wait users.
> 
> Looks like a good candidate to test the cwait on :-)

Poll uses custom wake functions, which disqualifies them on the spot.
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