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| author | Seth Jennings <sjenning@linux.vnet.ibm.com> | 2012-07-02 16:15:52 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-07-09 11:35:00 -0700 |
| commit | b74185108668ef966e663878adbad65e03bfcb43 (patch) | |
| tree | 39e367491f761ba93fbddc56a93f353b021552cc /drivers/staging/zram | |
| parent | 166cfda752ca22eb6912614993b85f9a997dbd8f (diff) | |
| download | lwn-b74185108668ef966e663878adbad65e03bfcb43.tar.gz lwn-b74185108668ef966e663878adbad65e03bfcb43.zip | |
staging: zsmalloc: add mapping modes
This patch improves mapping performance in zsmalloc by getting
usage information from the user in the form of a "mapping mode"
and using it to avoid unnecessary copying for objects that span
pages.
Signed-off-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/zram')
| -rw-r--r-- | drivers/staging/zram/zram_drv.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c index 706cb625aae9..653b074035f7 100644 --- a/drivers/staging/zram/zram_drv.c +++ b/drivers/staging/zram/zram_drv.c @@ -220,7 +220,8 @@ static int zram_bvec_read(struct zram *zram, struct bio_vec *bvec, uncmem = user_mem; clen = PAGE_SIZE; - cmem = zs_map_object(zram->mem_pool, zram->table[index].handle); + cmem = zs_map_object(zram->mem_pool, zram->table[index].handle, + ZS_MM_RO); ret = lzo1x_decompress_safe(cmem, zram->table[index].size, uncmem, &clen); @@ -258,7 +259,7 @@ static int zram_read_before_write(struct zram *zram, char *mem, u32 index) return 0; } - cmem = zs_map_object(zram->mem_pool, handle); + cmem = zs_map_object(zram->mem_pool, handle, ZS_MM_RO); ret = lzo1x_decompress_safe(cmem, zram->table[index].size, mem, &clen); zs_unmap_object(zram->mem_pool, handle); @@ -351,7 +352,7 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index, ret = -ENOMEM; goto out; } - cmem = zs_map_object(zram->mem_pool, handle); + cmem = zs_map_object(zram->mem_pool, handle, ZS_MM_WO); memcpy(cmem, src, clen); |