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authorHuang Ying <ying.huang@intel.com>2017-09-07 01:22:27 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2017-09-07 02:27:27 +0200
commit98cc093cba1e925eb34963dedb5f1684f1bdb2f4 (patch)
tree1651b9aed181959b1f5bae885a81ca130de09162 /drivers/nvdimm
parentmm, THP, swap: don't allocate huge cluster for file backed swap device (diff)
downloadlinux-98cc093cba1e925eb34963dedb5f1684f1bdb2f4.tar.xz
linux-98cc093cba1e925eb34963dedb5f1684f1bdb2f4.zip
block, THP: make block_device_operations.rw_page support THP
The .rw_page in struct block_device_operations is used by the swap subsystem to read/write the page contents from/into the corresponding swap slot in the swap device. To support the THP (Transparent Huge Page) swap optimization, the .rw_page is enhanced to support to read/write THP if possible. Link: http://lkml.kernel.org/r/20170724051840.2309-6-ying.huang@intel.com Signed-off-by: "Huang, Ying" <ying.huang@intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@intel.com> [for brd.c, zram_drv.c, pmem.c] Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Vishal L Verma <vishal.l.verma@intel.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Rik van Riel <riel@redhat.com> Cc: Shaohua Li <shli@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/nvdimm')
-rw-r--r--drivers/nvdimm/btt.c4
-rw-r--r--drivers/nvdimm/pmem.c41
2 files changed, 33 insertions, 12 deletions
diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index 14323faf8bd9..60491641a8d6 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -1241,8 +1241,10 @@ static int btt_rw_page(struct block_device *bdev, sector_t sector,
{
struct btt *btt = bdev->bd_disk->private_data;
int rc;
+ unsigned int len;
- rc = btt_do_bvec(btt, NULL, page, PAGE_SIZE, 0, is_write, sector);
+ len = hpage_nr_pages(page) * PAGE_SIZE;
+ rc = btt_do_bvec(btt, NULL, page, len, 0, is_write, sector);
if (rc == 0)
page_endio(page, is_write, 0);
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index f7099adaabc0..e9aa453da50c 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -80,22 +80,40 @@ static blk_status_t pmem_clear_poison(struct pmem_device *pmem,
static void write_pmem(void *pmem_addr, struct page *page,
unsigned int off, unsigned int len)
{
- void *mem = kmap_atomic(page);
-
- memcpy_flushcache(pmem_addr, mem + off, len);
- kunmap_atomic(mem);
+ unsigned int chunk;
+ void *mem;
+
+ while (len) {
+ mem = kmap_atomic(page);
+ chunk = min_t(unsigned int, len, PAGE_SIZE);
+ memcpy_flushcache(pmem_addr, mem + off, chunk);
+ kunmap_atomic(mem);
+ len -= chunk;
+ off = 0;
+ page++;
+ pmem_addr += PAGE_SIZE;
+ }
}
static blk_status_t read_pmem(struct page *page, unsigned int off,
void *pmem_addr, unsigned int len)
{
+ unsigned int chunk;
int rc;
- void *mem = kmap_atomic(page);
-
- rc = memcpy_mcsafe(mem + off, pmem_addr, len);
- kunmap_atomic(mem);
- if (rc)
- return BLK_STS_IOERR;
+ void *mem;
+
+ while (len) {
+ mem = kmap_atomic(page);
+ chunk = min_t(unsigned int, len, PAGE_SIZE);
+ rc = memcpy_mcsafe(mem + off, pmem_addr, chunk);
+ kunmap_atomic(mem);
+ if (rc)
+ return BLK_STS_IOERR;
+ len -= chunk;
+ off = 0;
+ page++;
+ pmem_addr += PAGE_SIZE;
+ }
return BLK_STS_OK;
}
@@ -188,7 +206,8 @@ static int pmem_rw_page(struct block_device *bdev, sector_t sector,
struct pmem_device *pmem = bdev->bd_queue->queuedata;
blk_status_t rc;
- rc = pmem_do_bvec(pmem, page, PAGE_SIZE, 0, is_write, sector);
+ rc = pmem_do_bvec(pmem, page, hpage_nr_pages(page) * PAGE_SIZE,
+ 0, is_write, sector);
/*
* The ->rw_page interface is subtle and tricky. The core