diff options
| author | Seth Jennings | 2012-07-02 23:15:52 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2012-07-09 20:35:00 +0200 |
| commit | b74185108668ef966e663878adbad65e03bfcb43 (patch) | |
| tree | 39e367491f761ba93fbddc56a93f353b021552cc /drivers/staging/zsmalloc/zsmalloc.h | |
| parent | staging: zsmalloc: add details to zs_map_object boiler plate (diff) | |
| download | kernel-qcow2-linux-b74185108668ef966e663878adbad65e03bfcb43.tar.gz kernel-qcow2-linux-b74185108668ef966e663878adbad65e03bfcb43.tar.xz kernel-qcow2-linux-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/zsmalloc/zsmalloc.h')
| -rw-r--r-- | drivers/staging/zsmalloc/zsmalloc.h | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/staging/zsmalloc/zsmalloc.h b/drivers/staging/zsmalloc/zsmalloc.h index 485cbb1a5ac8..de2e8bfbcc06 100644 --- a/drivers/staging/zsmalloc/zsmalloc.h +++ b/drivers/staging/zsmalloc/zsmalloc.h @@ -15,6 +15,17 @@ #include <linux/types.h> +/* + * zsmalloc mapping modes + * + * NOTE: These only make a difference when a mapped object spans pages +*/ +enum zs_mapmode { + ZS_MM_RW, /* normal read-write mapping */ + ZS_MM_RO, /* read-only (no copy-out at unmap time) */ + ZS_MM_WO /* write-only (no copy-in at map time) */ +}; + struct zs_pool; struct zs_pool *zs_create_pool(const char *name, gfp_t flags); @@ -23,7 +34,8 @@ void zs_destroy_pool(struct zs_pool *pool); unsigned long zs_malloc(struct zs_pool *pool, size_t size); void zs_free(struct zs_pool *pool, unsigned long obj); -void *zs_map_object(struct zs_pool *pool, unsigned long handle); +void *zs_map_object(struct zs_pool *pool, unsigned long handle, + enum zs_mapmode mm); void zs_unmap_object(struct zs_pool *pool, unsigned long handle); u64 zs_get_total_size_bytes(struct zs_pool *pool); |