lkml.org 
[lkml]   [2010]   [May]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v4 0/13] Uprobes v4
> * Srikar Dronamraju (srikar@linux.vnet.ibm.com) wrote:
> > Uprobes Patches
> >
> > Changelog from v3:
> > - Reverted to background page replacement as suggested by Peter Zijlstra.
>
> Why ?
>
> I'm not sure we reached any concensus about the need for a background page
> replacement.
>
> Thanks,
>
> Mathieu
>

I was tested with access_process_vm(previous patchset) and the current
(background page replacement) and the results are the same.

However Peter Zijlstra's contention still stands that we might be
relying on a undocumented feature in the hardware and the flipping the
pages isnt that hard or expensive.

Even Linus, (http://lkml.org/lkml/2010/1/27/87) had shown inclination
towards background page replacement.

Also when uprobes implements global tracing support (i.e probing a
particular symbol in a dso across processes), it has to rely on
background page replacement.

Hence I based this patchset on background page replacement rather than
on access_process_vm. Later On, if there is a consensus on using
access_process_vm, we can make the corresponding changes.

--
Thanks and Regards
Srikar


\
 
 \ /
  Last update: 2010-05-19 08:11    [W:0.159 / U:27.720 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site