lkml.org 
[lkml]   [2015]   [May]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH v11 12/12] drivers/block/pmem: Map NVDIMM with ioremap_wt()
From
On Fri, May 29, 2015 at 3:59 PM, Toshi Kani <toshi.kani@hp.com> wrote:
> From: Toshi Kani <toshi.kani@hp.com>
>
> The pmem driver maps NVDIMM with ioremap_nocache() as we cannot
> write back the contents of the CPU caches in case of a crash.
>
> This patch changes to use ioremap_wt(), which provides uncached
> writes but cached reads, for improving read performance.
>
> Signed-off-by: Toshi Kani <toshi.kani@hp.com>

Acked-by: Dan Williams <dan.j.williams@intel.com>

...with the caveat that I'm going to follow in behind this series with
generic ioremap_cache() enabling and converting pmem to use
persistent_copy() / persistent_sync() when the arch/cpu has persistent
memory synchronization instructions. After the conversion
ioremap_wt() will still be there for the non-persistent_sync() capable
case.


\
 
 \ /
  Last update: 2015-05-30 03:41    [W:0.118 / U:5.556 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site