lkml.org 
[lkml]   [2008]   [Aug]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: ftrace introduces instability into kernel 2.6.27(-rc2,-rc3)
From
Date
On Tue, 2008-08-19 at 16:58 -0700, Jeremy Fitzhardinge wrote:
> Benjamin Herrenschmidt wrote:
> >> Ok, there are two cases where it's ok :
> >>
> >> 1 - in stop_machine, considering we are not touching code executed in
> >> NMI handlers.
> >> 2 - when using my replace_instruction_safe() which uses a temporary
> >> breakpoint when doing the instruction replacement.
> >>
> >> In those cases you could use text_poke_early().
> >>
> >
> > Note that vmap/vunmap will be very slow.
> >
>
> Don't we have Nick's speedups now?

Not sure what speedups this is, but it's stlil not something you want to
do a lot ... setting up and tearing down MMU mappings isn't something
I'd like to see happening on a per-mcount basis.

Ben



\
 
 \ /
  Last update: 2008-08-20 03:23    [W:0.649 / U:0.668 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site