lkml.org 
[lkml]   [2010]   [Apr]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Frontswap [PATCH 0/4] (was Transcendent Memory): overview
On 04/23/2010 07:26 PM, Dan Magenheimer wrote:
>>
>> Looks like "init" == open, "put_page" == write, "get_page" == read,
>> "flush_page|flush_area" == trim. The only difference seems to be that
>> an overwriting put_page may fail. Doesn't seem to be much of a win,
>>
> No, ANY put_page can fail, and this is a critical part of the API
> that provides all of the flexibility for the hypervisor and all
> the guests. (See previous reply.)
>

The guest isn't required to do any put_page()s. It can issue lots of
them when memory is available, and keep them in the hypervisor forever.
Failing new put_page()s isn't enough for a dynamic system, you need to
be able to force the guest to give up some of its tmem.

--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.



\
 
 \ /
  Last update: 2010-04-24 20:27    [W:1.167 / U:0.372 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site