lkml.org 
[lkml]   [2018]   [Feb]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 3/6] struct page: add field for vm_struct
On Sun, Feb 11, 2018 at 05:19:17AM +0200, Igor Stoppa wrote:
> The struct page has a "mapping" field, which can be re-used, to store a
> pointer to the parent area. This will avoid more expensive searches.
>
> As example, the function find_vm_area is reimplemented, to take advantage
> of the newly introduced field.

Umm. Is it more efficient? You're replacing an rb-tree search with a
page-table walk. You eliminate a spinlock, which is great, but is the
page-table walk more efficient? I suppose it'll depend on the depth of
the rb-tree, and (at least on x86), the page tables should already be
in cache.

Unrelated to this patch, I'm working on a patch to give us page_type,
and I think I'll allocate a bit to mark pages which are vmalloced.

\
 
 \ /
  Last update: 2018-02-11 22:18    [W:1.792 / U:0.000 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site