linux-kernel - RE: [PATCH 1/1] Drivers: base: memory: Export symbols for onlining memory blocks

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Message-ID: <3318be0a96cb4d05838d76dc9d088cc0@SN2PR03MB061.namprd03.prod.outlook.com>
Date:	Tue, 23 Jul 2013 15:54:10 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Dave Hansen <dave.hansen@...el.com>
CC:	Michal Hocko <mhocko@...e.cz>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"andi@...stfloor.org" <andi@...stfloor.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"kamezawa.hiroyuki@...il.com" <kamezawa.hiroyuki@...il.com>,
	"hannes@...xchg.org" <hannes@...xchg.org>,
	"yinghan@...gle.com" <yinghan@...gle.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"kay@...y.org" <kay@...y.org>
Subject: RE: [PATCH 1/1] Drivers: base: memory: Export symbols for onlining
 memory blocks



> -----Original Message-----
> From: Dave Hansen [mailto:dave.hansen@...el.com]
> Sent: Tuesday, July 23, 2013 11:28 AM
> To: KY Srinivasan
> Cc: Michal Hocko; gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org;
> devel@...uxdriverproject.org; olaf@...fle.de; apw@...onical.com;
> andi@...stfloor.org; akpm@...ux-foundation.org; linux-mm@...ck.org;
> kamezawa.hiroyuki@...il.com; hannes@...xchg.org; yinghan@...gle.com;
> jasowang@...hat.com; kay@...y.org
> Subject: Re: [PATCH 1/1] Drivers: base: memory: Export symbols for onlining
> memory blocks
> 
> On 07/23/2013 07:52 AM, KY Srinivasan wrote:
> >  The current scheme of involving user
> > level code to close this loop obviously does not perform well under high
> memory pressure.
> 
> Adding memory usually requires allocating some large, contiguous areas
> of memory for use as mem_map[] and other VM structures.  That's really
> hard to do under heavy memory pressure.  How are you accomplishing this?

I cannot avoid failures because of lack of memory. In this case I notify the host of
the failure and also tag the failure as transient. Host retries the operation after some
delay. There is no guarantee it will succeed though.

K. Y
> 
> 
> 



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