Re: [PATCH 1/2] Revert "mm: make faultaround produce old ptes"

[Kirill A. Shutemov]

On Thu, Jun 16, 2016 at 02:20:02PM +0200, Michal Hocko wrote:
> On Tue 14-06-16 11:42:29, Kirill A. Shutemov wrote:
> > This reverts commit 5c0a85fad949212b3e059692deecdeed74ae7ec7.
> > 
> > The commit causes ~6% regression in unixbench.
> 
> Is the regression fully explained? My understanding from the email
> thread is that this is suspiciously too high. It is not like I would
> be against the revert but having an explanation would be really
> appreciated.

My understanding is that it's overhead on setting accessed bit:

http://lkml.kernel.org/r/20160613125248.GA30109@xxxxxxxxxxxxxxxxxx

-- 
 Kirill A. Shutemov