libnvdimm, pmem: disable dax flushing when pmem is fronting a volatile region

Browse source

The pmem driver attaches to both persistent and volatile memory ranges
advertised by the ACPI NFIT. When the region is volatile it is redundant
to spend cycles flushing caches at fsync(). Check if the hosting region
is volatile and do not set dax_write_cache() if it is.

Cc: Jan Kara <jack@suse.cz>
Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

...

This commit is contained in:

Dan Williams 2017-06-09 09:46:50 -07:00

parent 6e0c90d691

commit 0b277961f4

3 changed files with 15 additions and 5 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

13

drivers/nvdimm/pmem.c

View file

6

drivers/nvdimm/region_devs.c

View file

1

include/linux/libnvdimm.h

View file