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| author | Dan Streetman <ddstreet@ieee.org> | 2015-06-25 15:00:35 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-06-25 17:00:37 -0700 |
| commit | c00ed16a9eb98a7fc076e227bdd95c1451ca1e6e (patch) | |
| tree | 5755f0f5b8cb5bf27b86d4a8b183722442475095 /mm/zswap.c | |
| parent | d93435c3fba4a47b773693b0c8992470d38510d5 (diff) | |
| download | lwn-c00ed16a9eb98a7fc076e227bdd95c1451ca1e6e.tar.gz lwn-c00ed16a9eb98a7fc076e227bdd95c1451ca1e6e.zip | |
zswap: runtime enable/disable
Change the "enabled" parameter to be configurable at runtime. Remove the
enabled check from init(), and move it to the frontswap store() function;
when enabled, pages will be stored, and when disabled, pages won't be
stored.
This is almost identical to Seth's patch from 2 years ago:
http://lkml.iu.edu/hypermail/linux/kernel/1307.2/04289.html
[akpm@linux-foundation.org: tweak documentation]
Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Suggested-by: Seth Jennings <sjennings@variantweb.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/zswap.c')
| -rw-r--r-- | mm/zswap.c | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/mm/zswap.c b/mm/zswap.c index 4249e82ff934..2d5727baed59 100644 --- a/mm/zswap.c +++ b/mm/zswap.c @@ -75,9 +75,10 @@ static u64 zswap_duplicate_entry; /********************************* * tunables **********************************/ -/* Enable/disable zswap (disabled by default, fixed at boot for now) */ -static bool zswap_enabled __read_mostly; -module_param_named(enabled, zswap_enabled, bool, 0444); + +/* Enable/disable zswap (disabled by default) */ +static bool zswap_enabled; +module_param_named(enabled, zswap_enabled, bool, 0644); /* Compressor to be used by zswap (fixed at boot for now) */ #define ZSWAP_COMPRESSOR_DEFAULT "lzo" @@ -648,7 +649,7 @@ static int zswap_frontswap_store(unsigned type, pgoff_t offset, u8 *src, *dst; struct zswap_header *zhdr; - if (!tree) { + if (!zswap_enabled || !tree) { ret = -ENODEV; goto reject; } @@ -901,9 +902,6 @@ static int __init init_zswap(void) { gfp_t gfp = __GFP_NORETRY | __GFP_NOWARN; - if (!zswap_enabled) - return 0; - pr_info("loading zswap\n"); zswap_pool = zpool_create_pool(zswap_zpool_type, "zswap", gfp, |