linux-kernel - RE: [PATCH 3.2.0-rc1 3/3] Used Memory Meter pseudo-device module

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Message-ID: <84FF21A720B0874AA94B46D76DB9826904554B81@008-AM1MPN1-003.mgdnok.nokia.com>
Date:	Mon, 9 Jan 2012 10:19:30 +0000
From:	<leonid.moiseichuk@...ia.com>
To:	<rientjes@...gle.com>
CC:	<gregkh@...e.de>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>, <cesarb@...arb.net>,
	<kamezawa.hiroyu@...fujitsu.com>, <emunson@...bm.net>,
	<penberg@...nel.org>, <aarcange@...hat.com>, <riel@...hat.com>,
	<mel@....ul.ie>, <dima@...roid.com>, <rebecca@...roid.com>,
	<san@...gle.com>, <akpm@...ux-foundation.org>,
	<vesa.jaaskelainen@...ia.com>
Subject: RE: [PATCH 3.2.0-rc1 3/3] Used Memory Meter pseudo-device module

> -----Original Message-----
> From: ext David Rientjes [mailto:rientjes@...gle.com]
> Sent: 09 January, 2012 12:09
...
> 
> I'm not sure why you need to detect low memory thresholds if you're not
> interested in using the memory controller, why not just use the oom killer
> delay that I suggested earlier and allow userspace to respond to conditions
> when you are known to failed reclaim and require that something be killed?

As I understand that is required to turn on memcg and memcg is a thing I try to avoid.

> > 1.7. David Rientjes
> > > This is just a side-note but as this information is meant to be
> > > consumed by userspace you have the option of hooking into the
> > > mm_page_alloc tracepoint. You get the same information about how
> > > many pages are allocated or freed. I accept that it will probably be a bit
> slower but on the plus side it'll be backwards compatible and you don't need
> a kernel patch for it.
> >
> 
> I didn't write that.

Sorry, it was Mel Gorman. Copy-paste problem.
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