linux-kernel - Re: [RFC][PATCH 3/8] mem_notify v5: introduce /dev/mem_notify new device (the core of this patch series)

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Message-ID: <cfd9edbf0801240419t669c9d9cl4cf0f821599fc7ad@mail.gmail.com>
Date:	Thu, 24 Jan 2008 13:19:45 +0100
From:	"Daniel Spång" <daniel.spang@...il.com>
To:	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	"Marcelo Tosatti" <marcelo@...ck.org>,
	"Rik van Riel" <riel@...hat.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Alan Cox" <alan@...rguk.ukuu.org.uk>
Subject: Re: [RFC][PATCH 3/8] mem_notify v5: introduce /dev/mem_notify new device (the core of this patch series)

Hi KOSAKI,

On 1/24/08, KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:
> +#define PROC_WAKEUP_GUARD  (10*HZ)
[...]
> +       timeout = info->last_proc_notify + PROC_WAKEUP_GUARD;

If only one or a few processes are using the system I think 10 seconds
is a little long time to wait before they get the notification again.
Can we decrease this value? Or make it configurable under /proc? Or
make it lower with fewer users? Something like:

timeout = info->last_proc_notify + min(mem_notify_users, PROC_WAKEUP_GUARD);

Cheers,
Daniel
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