lkml.org 
[lkml]   [2019]   [Apr]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Thoughts on simple scanner approach for free page hinting
On Fri, Apr 05, 2019 at 05:09:45PM -0700, Alexander Duyck wrote:
> In addition we will need some way to identify which pages have been
> hinted on and which have not. The way I believe easiest to do this
> would be to overload the PageType value so that we could essentially
> have two values for "Buddy" pages. We would have our standard "Buddy"
> pages, and "Buddy" pages that also have the "Offline" value set in the
> PageType field. Tracking the Online vs Offline pages this way would
> actually allow us to do this with almost no overhead as the mapcount
> value is already being reset to clear the "Buddy" flag so adding a
> "Offline" flag to this clearing should come at no additional cost.

It bothers me a bit that this doesn't scale to multiple hint types
if we ever need them. Would it be better to have two
free lists: hinted and non-hinted one?


--
MST

\
 
 \ /
  Last update: 2019-04-09 04:45    [W:0.154 / U:0.400 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site