linux-kernel - Re: [PATCH 10/10] tools lib api: Adopt fdarray class from perf's evlist

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Date:	Tue, 26 Aug 2014 16:46:18 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Borislav Petkov <bp@...e.de>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Jean Pihet <jean.pihet@...aro.org>,
	Jiri Olsa <jolsa@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 10/10] tools lib api: Adopt fdarray class from perf's evlist

Hi Arnaldo,

On Fri, 22 Aug 2014 17:59:50 -0300, Arnaldo Carvalho de Melo wrote:
> +int fdarray__add(struct fdarray *fda, int fd)
> +{
> +	/*
> +	 * XXX: 64 is arbitrary, just not to call realloc at each fd.
> +	 *	Find a better autogrowing heuristic
> +	 */
> +	if (fda->nr == fda->nr_alloc &&
> +	    fdarray__grow(fda, 64) < 0)
> +		return -ENOMEM;
> +
> +	fcntl(fd, F_SETFL, O_NONBLOCK);
> +	fda->entries[fda->nr].fd = fd;
> +	fda->entries[fda->nr].events = POLLIN | POLLERR | POLLHUP;
> +	fda->nr++;
> +	return 0;
> +}

To be more generic api, I think it'd be better receiving events from
user rather than hard-coding.  Also it might be useful to let user
sets a grow hint (during init?) as well.

Thanks,
Namhyung
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