lkml.org 
[lkml]   [2017]   [Apr]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: copy_page() on a kmalloc-ed page with DEBUG_SLAB enabled (was "zram: do not use copy_page with non-page alinged address")
On (04/18/17 09:33), Michal Hocko wrote:
[..]
> > Another approach is the API does normal thing for non-aligned prefix and
> > tail space and fast thing for aligned space.
> > Otherwise, it would be happy if the API has WARN_ON non-page SIZE aligned
> > address.
>
> copy_page is a performance sensitive function and I believe that we do
> those tricks exactly for this purpose.

a wild thought,

use
#define copy_page(to,from) memcpy((to), (from), PAGE_SIZE)

when DEBUG_SLAB is set? so arch copy_page() (if provided by arch)
won't be affected otherwise.

-ss

\
 
 \ /
  Last update: 2017-04-18 13:00    [W:0.106 / U:0.992 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site