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

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Message-Id: <20080115110918.118B.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Tue, 15 Jan 2008 11:20:56 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com, 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

Hi Kame

> > +	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 ?

my intent is for avoid thundering herd.
100 is heuristic value.

and too many wakeup cause too much memory freed.
I don't want it.

of course, if any problem happened, I will change.
Do you dislike it?


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