linux-kernel - Re: [RFC][PATCH 3/5] add /dev/mem

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Message-Id: <20080115111035.d516639a.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 15 Jan 2008 11:10:35 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Marcelo Tosatti <marcelo@...ck.org>,
	Daniel Spang <daniel.spang@...il.com>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC][PATCH 3/5] add /dev/mem_notify device

On Tue, 15 Jan 2008 10:01:21 +0900
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:

> +	if (pressure) {
> +		nr_wakeup = max_t(int, atomic_read(&nr_watcher_task)>>4, 100);
> +		atomic_long_set(&last_mem_notify, jiffies);
> +		wake_up_locked_nr(&mem_wait, nr_wakeup);
> +	}
What is this for ? and Why ?
Are there too many waiters ?

Thanks
-Kame

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