The current parameters of zswap are not straightforward.
Changed them to start with zswap* and documented them.
Signed-off-by: Bob Liu <bob.liu@xxxxxxxxxx>
---
Documentation/kernel-parameters.txt | 8 ++++++++
mm/zswap.c | 27 +++++++++++++++++++++++----
2 files changed, 31 insertions(+), 4 deletions(-)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 2fe6e76..07642fd 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -3367,6 +3367,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
Format:
<irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]]
+ zswap Enable compressed cache for swap pages support which
+ is disabled by default.
+ zswapcompressor=
+ Select which compressor to be used by zswap.
+ The default compressor is lzo.
+ zswap_maxpool_percent=
+ Select how may percent of total memory can be used to
+ store comprssed pages. The default percent is 20%.
______________________________________________________________________
TODO:
diff --git a/mm/zswap.c b/mm/zswap.c
index 7fe2b1b..8ec1360 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -77,17 +77,13 @@ static u64 zswap_duplicate_entry;
**********************************/
/* Enable/disable zswap (disabled by default, fixed at boot for now) */
static bool zswap_enabled __read_mostly;
-module_param_named(enabled, zswap_enabled, bool, 0);
/* Compressor to be used by zswap (fixed at boot for now) */
#define ZSWAP_COMPRESSOR_DEFAULT "lzo"
static char *zswap_compressor = ZSWAP_COMPRESSOR_DEFAULT;
-module_param_named(compressor, zswap_compressor, charp, 0);
/* The maximum percentage of memory that the compressed pool can occupy */
static unsigned int zswap_max_pool_percent = 20;
-module_param_named(max_pool_percent,
- zswap_max_pool_percent, uint, 0644);
/*********************************
* compression functions
@@ -914,6 +910,29 @@ static int __init zswap_debugfs_init(void)
static void __exit zswap_debugfs_exit(void) { }
#endif
+static int __init enable_zswap(char *s)
+{
+ zswap_enabled = true;
+ return 1;
+}
+__setup("zswap", enable_zswap);
+
+static int __init setup_zswap_compressor(char *s)
+{
+ strlcpy(zswap_compressor, s, sizeof(zswap_compressor));
+ zswap_enabled = true;
+ return 1;
+}
+__setup("zswapcompressor=", setup_zswap_compressor);
+
+static int __init setup_zswap_max_pool_percent(char *s)
+{
+ get_option(&s, &zswap_max_pool_percent);
+ zswap_enabled = true;
+ return 1;
+}
+__setup("zswap_maxpool_percent=", setup_zswap_max_pool_percent);
+
/*********************************
* module init and exit
**********************************/
--
1.7.10.4
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