hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

nvdimm: reduce duplicated wpq flushes 

Existing implemenetation writes to all the flush hint addresses for a
given ND region. This is not necessary as the flushes are per imc and
not per DIMM. Search the mappings and clear out the duplicates at init
to avoid multiple flush to the same imc.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dave Jiang 2016-09-26 11:06:50 -07:00 committed by Dan Williams
parent 595c73071e
commit db58028ee4
1 changed files with 16 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/nvdimm/region_devs.c
View File

@ -70,7 +70,7 @@ static int nvdimm_map_flush(struct device *dev, struct nvdimm *nvdimm, int dimm,
int nd_region_activate(struct nd_region *nd_region)
{
int i, num_flush = 0;
int i, j, num_flush = 0;
struct nd_region_data *ndrd;
struct device *dev = &nd_region->dev;
size_t flush_data_size = sizeof(void *);
@ -107,6 +107,21 @@ int nd_region_activate(struct nd_region *nd_region)
return rc;
}
/*
* Clear out entries that are duplicates. This should prevent the
* extra flushings.
*/
for (i = 0; i < nd_region->ndr_mappings - 1; i++) {
/* ignore if NULL already */
if (!ndrd_get_flush_wpq(ndrd, i, 0))
continue;
for (j = i + 1; j < nd_region->ndr_mappings; j++)
if (ndrd_get_flush_wpq(ndrd, i, 0) ==
ndrd_get_flush_wpq(ndrd, j, 0))
ndrd_set_flush_wpq(ndrd, j, 0, NULL);
}
return 0;
}