lkml.org 
[lkml]   [2015]   [Aug]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v5 2/5] allow mapping page-less memremaped areas into KVA
On Thu, Aug 13, 2015 at 04:23:38PM +0300, Boaz Harrosh wrote:
> > DAX as is is races against pmem unbind. A synchronization cost must
> > be paid somewhere to make sure the memremap() mapping is still valid.
>
> Sorry for being so slow, is what I asked. what is exactly "pmem unbind" ?
>
> Currently in my 4.1 Kernel the ioremap is done on modprobe time and
> released modprobe --remove time. the --remove can not happen with a mounted
> FS dax or not. So what is exactly "pmem unbind". And if there is a new knob
> then make it refuse with a raised refcount.

Surprise removal of a PCIe card which is mapped to provide non-volatile
memory for example. Or memory hot swap.


\
 
 \ /
  Last update: 2015-08-13 17:01    [W:0.040 / U:2.240 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site