linux-kernel - Re: [RFC 1/3] /dev/low_mem

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Message-ID: <CAOJsxLHGYmVNk7D9NyhRuqQDwquDuA7LtUtp-1huSn5F-GvtAg@mail.gmail.com>
Date:	Tue, 17 Jan 2012 11:27:34 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Minchan Kim <minchan@...nel.org>
Cc:	linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	leonid.moiseichuk@...ia.com, kamezawa.hiroyu@...fujitsu.com,
	Rik van Riel <riel@...hat.com>, mel@....ul.ie,
	rientjes@...gle.com, KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ronen Hod <rhod@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [RFC 1/3] /dev/low_mem_notify

On Tue, Jan 17, 2012 at 10:13 AM, Minchan Kim <minchan@...nel.org> wrote:
> +static unsigned int low_mem_notify_poll(struct file *file, poll_table *wait)
> +{
> +        unsigned int ret = 0;
> +
> +        poll_wait(file, &low_mem_wait, wait);
> +
> +        if (atomic_read(&nr_low_mem) != 0) {
> +                ret = POLLIN;
> +                atomic_set(&nr_low_mem, 0);
> +        }
> +
> +        return ret;
> +}

Doesn't this mean that only one application will receive the notification?

                        Pekka
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