linux-kernel - Re: [PATCH 08/18] perf tools: Flush ordered events in case of allocation failure

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Message-ID: <20140629164142.GB1407@krava.redhat.com>
Date:	Sun, 29 Jun 2014 18:41:42 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	David Ahern <dsahern@...il.com>
Cc:	Jiri Olsa <jolsa@...nel.org>, linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Jean Pihet <jean.pihet@...aro.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 08/18] perf tools: Flush ordered events in case of
 allocation failure

On Fri, Jun 27, 2014 at 05:07:52PM -0600, David Ahern wrote:
> On 6/18/14, 8:58 AM, Jiri Olsa wrote:
> >+	case OEQ_FLUSH__HALF:
> >+	{
> >+		struct ordered_event *first, *last;
> >+		struct list_head *head = &q->events;
> >+
> >+		first = list_entry(head->next, struct ordered_event, list);
> >+		last = q->last;
> >+
> >+		if (WARN_ONCE(!last || list_empty(head), "empty queue"))
> >+			return 0;
> 
> Maybe a comment that the WARN_ONCE can only happen if perf can't allocate an
> ordered event the first time through?

ok, will do..

thanks,
jirka
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