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Re: [RFC][PATCH 3/5] add /dev/mem_notify device

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From: Alan Cox <alan@...>
To: KOSAKI Motohiro <kosaki.motohiro@...>
Cc: <kosaki.motohiro@...>, <linux-mm@...>, <linux-kernel@...>, Marcelo Tosatti <marcelo@...>, Daniel Spang <daniel.spang@...>, Rik van Riel <riel@...>, Andrew Morton <akpm@...>
Subject: Re: [RFC][PATCH 3/5] add /dev/mem_notify device
Date: Tuesday, January 15, 2008 - 7:20 am

On Tue, 15 Jan 2008 19:59:02 +0900
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> wrote:


If you have two processes each waiting on mem_notify is it not possible
that one of them will keep being the one woken up and the other will
remain stuck ?

It also appears there is no way to wait for memory shortages (processes
that can free memory easily) only for memory to start appearing.
--
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Messages in current thread:
[RFC][PATCH 0/5] mem notifications v4, KOSAKI Motohiro, (Mon Jan 14, 8:52 pm)
[RFC][PATCH 5/5] /proc/zoneinfo enhancement, KOSAKI Motohiro, (Mon Jan 14, 9:03 pm)
Re: [RFC][PATCH 5/5] /proc/zoneinfo enhancement, Alan Cox, (Tue Jan 15, 6:44 am)
Re: [RFC][PATCH 5/5] /proc/zoneinfo enhancement, KOSAKI Motohiro, (Tue Jan 15, 6:49 am)
[RFC][PATCH 4/5] memory_pressure_notify() caller, KOSAKI Motohiro, (Mon Jan 14, 9:02 pm)
Re: [RFC][PATCH 4/5] memory_pressure_notify() caller, Daniel Spång, (Tue Jan 15, 6:55 pm)
Re: [RFC][PATCH 4/5] memory_pressure_notify() caller, Rik van Riel, (Tue Jan 15, 6:59 pm)
Re: [RFC][PATCH 4/5] memory_pressure_notify() caller, Daniel Spång, (Tue Jan 15, 7:39 pm)
Re: [RFC][PATCH 4/5] memory_pressure_notify() caller, KOSAKI Motohiro, (Tue Jan 15, 9:48 pm)
Re: [RFC][PATCH 4/5] memory_pressure_notify() caller, Daniel Spång, (Wed Jan 16, 7:03 am)
Re: [RFC][PATCH 4/5] memory_pressure_notify() caller, KOSAKI Motohiro, (Wed Jan 16, 11:26 pm)
Re: [RFC][PATCH 4/5] memory_pressure_notify() caller, Daniel Spång, (Fri Jan 18, 6:24 am)
Re: [RFC][PATCH 4/5] memory_pressure_notify() caller, KOSAKI Motohiro, (Fri Jan 18, 6:30 am)
Re: [RFC][PATCH 4/5] memory_pressure_notify() caller, KAMEZAWA Hiroyuki, (Mon Jan 14, 10:06 pm)
Re: [RFC][PATCH 4/5] memory_pressure_notify() caller, KOSAKI Motohiro, (Mon Jan 14, 10:37 pm)
Re: [RFC][PATCH 4/5] memory_pressure_notify() caller, KAMEZAWA Hiroyuki, (Mon Jan 14, 11:00 pm)
Re: [RFC][PATCH 4/5] memory_pressure_notify() caller, KOSAKI Motohiro, (Mon Jan 14, 11:08 pm)
[RFC][PATCH 3/5] add /dev/mem_notify device, KOSAKI Motohiro, (Mon Jan 14, 9:01 pm)
Re: [RFC][PATCH 3/5] add /dev/mem_notify device, Pavel Machek, (Tue Jan 15, 6:16 pm)
Re: [RFC][PATCH 3/5] add /dev/mem_notify device, KOSAKI Motohiro, (Tue Jan 15, 9:57 pm)
Re: [RFC][PATCH 3/5] add /dev/mem_notify device, Marcelo Tosatti, (Wed Jan 16, 12:13 am)
Re: [RFC][PATCH 3/5] add /dev/mem_notify device, Pavel Machek, (Wed Jan 16, 7:42 am)
Re: [RFC][PATCH 3/5] add /dev/mem_notify device, Daniel Spång, (Wed Jan 16, 7:51 am)
Re: [RFC][PATCH 3/5] add /dev/mem_notify device, KOSAKI Motohiro, (Wed Jan 16, 11:04 pm)
Re: [RFC][PATCH 3/5] add /dev/mem_notify device, Alan Cox, (Tue Jan 15, 6:46 am)
Re: [RFC][PATCH 3/5] add /dev/mem_notify device, KOSAKI Motohiro, (Tue Jan 15, 6:59 am)
Re: [RFC][PATCH 3/5] add /dev/mem_notify device, Alan Cox, (Tue Jan 15, 7:20 am)
Re: [RFC][PATCH 3/5] add /dev/mem_notify device, Marcelo Tosatti, (Tue Jan 15, 8:05 am)
Re: [RFC][PATCH 3/5] add /dev/mem_notify device, Alan Cox, (Tue Jan 15, 9:42 am)
Re: [RFC][PATCH 3/5] add /dev/mem_notify device, KOSAKI Motohiro, (Tue Jan 15, 7:48 am)
Re: [RFC][PATCH 3/5] add /dev/mem_notify device, Alan Cox, (Tue Jan 15, 9:42 am)
Re: [RFC][PATCH 3/5] add /dev/mem_notify device, KOSAKI Motohiro, (Tue Jan 15, 10:43 pm)
Re: [RFC][PATCH 3/5] add /dev/mem_notify device, KAMEZAWA Hiroyuki, (Mon Jan 14, 10:10 pm)
Re: [RFC][PATCH 3/5] add /dev/mem_notify device, KOSAKI Motohiro, (Mon Jan 14, 10:20 pm)
Re: [RFC][PATCH 3/5] add /dev/mem_notify device, Rik van Riel, (Mon Jan 14, 10:56 pm)
Re: [RFC][PATCH 3/5] add /dev/mem_notify device, Randy Dunlap, (Mon Jan 14, 9:08 pm)
Re: [RFC][PATCH 3/5] add /dev/mem_notify device, KOSAKI Motohiro, (Mon Jan 14, 9:20 pm)
Re: [RFC][PATCH 3/5] add /dev/mem_notify device, KOSAKI Motohiro, (Mon Jan 14, 9:24 pm)
[RFC][PATCH 2/5] introduce wake_up_locked_nr() new API, KOSAKI Motohiro, (Mon Jan 14, 9:00 pm)
[RFC][PATCH 1/5] introduce poll_wait_exclusive() new API , KOSAKI Motohiro, (Mon Jan 14, 8:59 pm)