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

[KY Srinivasan <kys@microsoft.com>]

> -----Original Message-----
> From: Dave Hansen [mailto:dave.hansen@intel.com]
> Sent: Tuesday, July 23, 2013 11:28 AM
> To: KY Srinivasan
> Cc: Michal Hocko; gregkh@linuxfoundation.org; linux-kernel@vger.kernel.org;
> devel@linuxdriverproject.org; olaf@aepfle.de; apw@canonical.com;
> andi@firstfloor.org; akpm@linux-foundation.org; linux-mm@kvack.org;
> kamezawa.hiroyuki@gmail.com; hannes@cmpxchg.org; yinghan@google.com;
> jasowang@redhat.com; kay@vrfy.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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