diff options
author | Dan Magenheimer <dan.magenheimer@oracle.com> | 2013-04-30 22:27:05 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-05-01 00:04:01 (GMT) |
commit | 835f2f51608fd80e1aef5a8955dabcc36ea528a4 (patch) | |
tree | 6faea4b90d9c76ce7962ebcce0b5b98373e44f3c /drivers/staging | |
parent | 1ac37bee81531cb62a9a64e78ffdad7da9b20ea2 (diff) | |
download | linux-835f2f51608fd80e1aef5a8955dabcc36ea528a4.tar.xz |
staging: zcache: enable zcache to be built/loaded as a module
Allow zcache to be built/loaded as a module. Note runtime dependency
disallows loading if cleancache/frontswap lazy initialization patches
are not present. Zsmalloc support has not yet been merged into zcache
but, once merged, could now easily be selected via a module_param.
If built-in (not built as a module), the original mechanism of enabling
via a kernel boot parameter is retained, but this should be considered
deprecated.
Note that module unload is explicitly not yet supported.
Signed-off-by: Dan Magenheimer <dan.magenheimer@oracle.com>
[v1: Rebased with different order of patches]
[v2: Removed [CLEANCACHE|FRONTSWAP]_HAS_LAZY_INIT ifdef]
[v3: Rebased on top of ramster->zcache move]
[v4: Redid the Makefile]
[v5: s/ZCACHE2/ZCACHE/]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>
Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Cc: Andor Daam <andor.daam@googlemail.com>
Cc: Florian Schmaus <fschmaus@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Stefan Hengelein <ilendir@googlemail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/staging')
-rw-r--r-- | drivers/staging/zcache/Kconfig | 6 | ||||
-rw-r--r-- | drivers/staging/zcache/tmem.c | 6 | ||||
-rw-r--r-- | drivers/staging/zcache/tmem.h | 8 | ||||
-rw-r--r-- | drivers/staging/zcache/zcache-main.c | 45 | ||||
-rw-r--r-- | drivers/staging/zcache/zcache.h | 2 |
5 files changed, 55 insertions, 12 deletions
diff --git a/drivers/staging/zcache/Kconfig b/drivers/staging/zcache/Kconfig index 05e87a1..2d7b2da 100644 --- a/drivers/staging/zcache/Kconfig +++ b/drivers/staging/zcache/Kconfig @@ -1,5 +1,5 @@ config ZCACHE - bool "Dynamic compression of swap pages and clean pagecache pages" + tristate "Dynamic compression of swap pages and clean pagecache pages" depends on CRYPTO=y && SWAP=y && CLEANCACHE && FRONTSWAP select CRYPTO_LZO default n @@ -19,8 +19,8 @@ config ZCACHE_DEBUG how zcache is doing. You probably want to set this to 'N'. config RAMSTER - bool "Cross-machine RAM capacity sharing, aka peer-to-peer tmem" - depends on CONFIGFS_FS=y && SYSFS=y && !HIGHMEM && ZCACHE=y + tristate "Cross-machine RAM capacity sharing, aka peer-to-peer tmem" + depends on CONFIGFS_FS=y && SYSFS=y && !HIGHMEM && ZCACHE depends on NET # must ensure struct page is 8-byte aligned select HAVE_ALIGNED_STRUCT_PAGE if !64BIT diff --git a/drivers/staging/zcache/tmem.c b/drivers/staging/zcache/tmem.c index a2b7e03..d7e51e4 100644 --- a/drivers/staging/zcache/tmem.c +++ b/drivers/staging/zcache/tmem.c @@ -35,7 +35,8 @@ #include <linux/list.h> #include <linux/spinlock.h> #include <linux/atomic.h> -#ifdef CONFIG_RAMSTER +#include <linux/export.h> +#if defined(CONFIG_RAMSTER) || defined(CONFIG_RAMSTER_MODULE) #include <linux/delay.h> #endif @@ -641,6 +642,7 @@ void *tmem_localify_get_pampd(struct tmem_pool *pool, struct tmem_oid *oidp, /* note, hashbucket remains locked */ return pampd; } +EXPORT_SYMBOL_GPL(tmem_localify_get_pampd); void tmem_localify_finish(struct tmem_obj *obj, uint32_t index, void *pampd, void *saved_hb, bool delete) @@ -658,6 +660,7 @@ void tmem_localify_finish(struct tmem_obj *obj, uint32_t index, } spin_unlock(&hb->lock); } +EXPORT_SYMBOL_GPL(tmem_localify_finish); /* * For ramster only. Helper function to support asynchronous tmem_get. @@ -719,6 +722,7 @@ out: spin_unlock(&hb->lock); return ret; } +EXPORT_SYMBOL_GPL(tmem_replace); #endif /* diff --git a/drivers/staging/zcache/tmem.h b/drivers/staging/zcache/tmem.h index adbe5a8..d128ce2 100644 --- a/drivers/staging/zcache/tmem.h +++ b/drivers/staging/zcache/tmem.h @@ -126,7 +126,7 @@ static inline unsigned tmem_oid_hash(struct tmem_oid *oidp) TMEM_HASH_BUCKET_BITS); } -#ifdef CONFIG_RAMSTER +#if defined(CONFIG_RAMSTER) || defined(CONFIG_RAMSTER_MODULE) struct tmem_xhandle { uint8_t client_id; uint8_t xh_data_cksum; @@ -171,7 +171,7 @@ struct tmem_obj { unsigned int objnode_tree_height; unsigned long objnode_count; long pampd_count; -#ifdef CONFIG_RAMSTER +#if defined(CONFIG_RAMSTER) || defined(CONFIG_RAMSTER_MODULE) /* * for current design of ramster, all pages belonging to * an object reside on the same remotenode and extra is @@ -215,7 +215,7 @@ struct tmem_pamops { uint32_t); void (*free)(void *, struct tmem_pool *, struct tmem_oid *, uint32_t, bool); -#ifdef CONFIG_RAMSTER +#if defined(CONFIG_RAMSTER) || defined(CONFIG_RAMSTER_MODULE) void (*new_obj)(struct tmem_obj *); void (*free_obj)(struct tmem_pool *, struct tmem_obj *, bool); void *(*repatriate_preload)(void *, struct tmem_pool *, @@ -247,7 +247,7 @@ extern int tmem_flush_page(struct tmem_pool *, struct tmem_oid *, extern int tmem_flush_object(struct tmem_pool *, struct tmem_oid *); extern int tmem_destroy_pool(struct tmem_pool *); extern void tmem_new_pool(struct tmem_pool *, uint32_t); -#ifdef CONFIG_RAMSTER +#if defined(CONFIG_RAMSTER) || defined(CONFIG_RAMSTER_MODULE) extern int tmem_replace(struct tmem_pool *, struct tmem_oid *, uint32_t index, void *); extern void *tmem_localify_get_pampd(struct tmem_pool *, struct tmem_oid *, diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c index 326c2ea..522cb8e 100644 --- a/drivers/staging/zcache/zcache-main.c +++ b/drivers/staging/zcache/zcache-main.c @@ -37,8 +37,10 @@ #include "debug.h" #ifdef CONFIG_RAMSTER static bool ramster_enabled __read_mostly; +static int disable_frontswap_selfshrink; #else #define ramster_enabled false +#define disable_frontswap_selfshrink 0 #endif #ifndef __PG_WAS_ACTIVE @@ -81,8 +83,12 @@ static char *namestr __read_mostly = "zcache"; (__GFP_FS | __GFP_NORETRY | __GFP_NOWARN | __GFP_NOMEMALLOC) /* crypto API for zcache */ +#ifdef CONFIG_ZCACHE_MODULE +static char *zcache_comp_name = "lzo"; +#else #define ZCACHE_COMP_NAME_SZ CRYPTO_MAX_ALG_NAME static char zcache_comp_name[ZCACHE_COMP_NAME_SZ] __read_mostly; +#endif static struct crypto_comp * __percpu *zcache_comp_pcpu_tfms __read_mostly; enum comp_op { @@ -1721,6 +1727,7 @@ struct frontswap_ops *zcache_frontswap_register_ops(void) * OR NOTHING HAPPENS! */ +#ifndef CONFIG_ZCACHE_MODULE static int __init enable_zcache(char *s) { zcache_enabled = true; @@ -1787,18 +1794,27 @@ static int __init enable_zcache_compressor(char *s) return 1; } __setup("zcache=", enable_zcache_compressor); +#endif -static int __init zcache_comp_init(void) +static int zcache_comp_init(void) { int ret = 0; /* check crypto algorithm */ +#ifdef CONFIG_ZCACHE_MODULE + ret = crypto_has_comp(zcache_comp_name, 0, 0); + if (!ret) { + ret = -1; + goto out; + } +#else if (*zcache_comp_name != '\0') { ret = crypto_has_comp(zcache_comp_name, 0, 0); if (!ret) pr_info("zcache: %s not supported\n", zcache_comp_name); + goto out; } if (!ret) strcpy(zcache_comp_name, "lzo"); @@ -1807,6 +1823,7 @@ static int __init zcache_comp_init(void) ret = 1; goto out; } +#endif pr_info("zcache: using %s compressor\n", zcache_comp_name); /* alloc percpu transforms */ @@ -1818,10 +1835,13 @@ out: return ret; } -static int __init zcache_init(void) +static int zcache_init(void) { int ret = 0; +#ifdef CONFIG_ZCACHE_MODULE + zcache_enabled = 1; +#endif if (ramster_enabled) { namestr = "ramster"; ramster_register_pamops(&zcache_pamops); @@ -1894,9 +1914,28 @@ static int __init zcache_init(void) } if (ramster_enabled) ramster_init(!disable_cleancache, !disable_frontswap, - frontswap_has_exclusive_gets, false); + frontswap_has_exclusive_gets, + !disable_frontswap_selfshrink); out: return ret; } +#ifdef CONFIG_ZCACHE_MODULE +#ifdef CONFIG_RAMSTER +module_param(ramster_enabled, int, S_IRUGO); +module_param(disable_frontswap_selfshrink, int, S_IRUGO); +#endif +module_param(disable_cleancache, int, S_IRUGO); +module_param(disable_frontswap, int, S_IRUGO); +#ifdef FRONTSWAP_HAS_EXCLUSIVE_GETS +module_param(frontswap_has_exclusive_gets, bool, S_IRUGO); +#endif +module_param(disable_frontswap_ignore_nonactive, int, S_IRUGO); +module_param(zcache_comp_name, charp, S_IRUGO); +module_init(zcache_init); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Dan Magenheimer <dan.magenheimer@oracle.com>"); +MODULE_DESCRIPTION("In-kernel compression of cleancache/frontswap pages"); +#else late_initcall(zcache_init); +#endif diff --git a/drivers/staging/zcache/zcache.h b/drivers/staging/zcache/zcache.h index 81722b3..8491200 100644 --- a/drivers/staging/zcache/zcache.h +++ b/drivers/staging/zcache/zcache.h @@ -39,7 +39,7 @@ extern int zcache_flush_page(int, int, struct tmem_oid *, uint32_t); extern int zcache_flush_object(int, int, struct tmem_oid *); extern void zcache_decompress_to_page(char *, unsigned int, struct page *); -#ifdef CONFIG_RAMSTER +#if defined(CONFIG_RAMSTER) || defined(CONFIG_RAMSTER_MODULE) extern void *zcache_pampd_create(char *, unsigned int, bool, int, struct tmem_handle *); int zcache_autocreate_pool(unsigned int cli_id, unsigned int pool_id, bool eph); |