lkml.org 
[lkml]   [2012]   [Oct]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 4/2] numa, mm: Rename the PROT_NONE fault handling functions

* Ingo Molnar <mingo@kernel.org> wrote:

> > Michel indicated that he does not use PROT_NONE for his
> > working set estimation code, but instead checks the accessed
> > bits in the page tables.
>
> The pte_young() WSS method has a couple of fundamental
> limitations:
>
> - it doesn't work with shared memory very well, the pte is per
> mapping, not per page. The PROT_NONE method instruments the
> physical page in essence.
>
> - it does not tell us which task touched the pte, in a
> multi-threaded program
>
> So like Peter I'd too expect these new WSS methods to eventually
> be picked up for any serious WSS work.

Nevertheless lets wait and see until it actually happens - and
meanwhile the prot_none namings are confusing.

So I've applied your patch as-is, with two more (new) usage
sites converted as well. Will push it out after a bit of
testing.

Thanks,

Ingo


\
 
 \ /
  Last update: 2012-10-21 16:21    [W:0.126 / U:0.020 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site