On Fri, May 29, 2015 at 3:59 PM, Toshi Kani <toshi.kani@xxxxxx> wrote: > From: Toshi Kani <toshi.kani@xxxxxx> > > 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@xxxxxx> Acked-by: Dan Williams <dan.j.williams@xxxxxxxxx> ...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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>