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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>
This commit is contained in:
Dan Magenheimer 2013-04-30 15:27:05 -07:00 committed by Linus Torvalds
parent 1ac37bee81
commit 835f2f5160
5 changed files with 55 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/staging/zcache/Kconfig
View File

@ -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

6
drivers/staging/zcache/tmem.c
View File

@ -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
/*

8
drivers/staging/zcache/tmem.h
View File

@ -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 *,

45
drivers/staging/zcache/zcache-main.c
View File

@ -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

2
drivers/staging/zcache/zcache.h
View File

@ -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);