linux-kernel - RE: [PATCH -v2 -mm] add extra free kbytes tunable

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Message-ID: <65795E11DBF1E645A09CEC7EAEE94B9CB4F747AA@USINDEVS02.corp.hds.com>
Date:	Fri, 14 Oct 2011 01:32:08 -0400
From:	Satoru Moriya <satoru.moriya@....com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	Satoru Moriya <smoriya@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"lwoodman@...hat.com" <lwoodman@...hat.com>,
	Seiji Aguchi <saguchi@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	"hannes@...xchg.org" <hannes@...xchg.org>
Subject: RE: [PATCH -v2 -mm] add extra free kbytes tunable

On 10/13/2011 01:35 AM, KAMEZAWA Hiroyuki wrote:
> 
> I don't read full story but....how about adding a new syscall like
> 
> ==
> sys_mem_shrink(int nid, int nr_scan_pages, int flags)
> 
> This system call scans LRU of specified nodes and free pages on LRU.
> This scan nr_scan_pages in LRU and returns the number of successfully
> freed pages.
> ==
> 
> Then, running this progam in SCHED_IDLE, a user can make free pages while
> the system is idle. If running in the highest priority, a user can keep
> free pages as he want. If a user run this under a memcg, user can free
> pages in a memcg. 

This is interesting. We can make userspace kswapd as we like with
this syscall. But it seems harder to be accepted...

Regards,
Satoru--
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