提交 10a7a077 编写于 作者: D Dan Magenheimer 提交者: Linus Torvalds

xen: tmem: enable Xen tmem shim to be built/loaded as a module

Allow Xen tmem shim to be built/loaded as a module.  Xen self-ballooning
and frontswap-selfshrinking are now also "lazily" initialized when the
Xen tmem shim is loaded as a module, unless explicitly disabled by
module parameters.

Note runtime dependency disallows loading if cleancache/frontswap lazy
initialization patches are not present.

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.

[v1: Removed the [CLEANCACHE|FRONTSWAP]_HAS_LAZY_INIT ifdef]
[v2: Squashed the xen/tmem: Remove the subsys call patch in]
[akpm@linux-foundation.org: fix build (disable_frontswap_selfshrinking undeclared)]
Signed-off-by: NDan Magenheimer <dan.magenheimer@oracle.com>
Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: NBob 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: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 ff610a1d
...@@ -145,9 +145,9 @@ config SWIOTLB_XEN ...@@ -145,9 +145,9 @@ config SWIOTLB_XEN
select SWIOTLB select SWIOTLB
config XEN_TMEM config XEN_TMEM
bool tristate
depends on !ARM depends on !ARM
default y if (CLEANCACHE || FRONTSWAP) default m if (CLEANCACHE || FRONTSWAP)
help help
Shim to interface in-kernel Transcendent Memory hooks Shim to interface in-kernel Transcendent Memory hooks
(e.g. cleancache and frontswap) to Xen tmem hypercalls. (e.g. cleancache and frontswap) to Xen tmem hypercalls.
......
...@@ -5,6 +5,7 @@ ...@@ -5,6 +5,7 @@
* Author: Dan Magenheimer * Author: Dan Magenheimer
*/ */
#include <linux/module.h>
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/types.h> #include <linux/types.h>
#include <linux/init.h> #include <linux/init.h>
...@@ -128,6 +129,7 @@ static int xen_tmem_flush_object(u32 pool_id, struct tmem_oid oid) ...@@ -128,6 +129,7 @@ static int xen_tmem_flush_object(u32 pool_id, struct tmem_oid oid)
return xen_tmem_op(TMEM_FLUSH_OBJECT, pool_id, oid, 0, 0, 0, 0, 0); return xen_tmem_op(TMEM_FLUSH_OBJECT, pool_id, oid, 0, 0, 0, 0, 0);
} }
#ifndef CONFIG_XEN_TMEM_MODULE
bool __read_mostly tmem_enabled = false; bool __read_mostly tmem_enabled = false;
static int __init enable_tmem(char *s) static int __init enable_tmem(char *s)
...@@ -136,6 +138,7 @@ static int __init enable_tmem(char *s) ...@@ -136,6 +138,7 @@ static int __init enable_tmem(char *s)
return 1; return 1;
} }
__setup("tmem", enable_tmem); __setup("tmem", enable_tmem);
#endif
#ifdef CONFIG_CLEANCACHE #ifdef CONFIG_CLEANCACHE
static int xen_tmem_destroy_pool(u32 pool_id) static int xen_tmem_destroy_pool(u32 pool_id)
...@@ -227,14 +230,19 @@ static int tmem_cleancache_init_shared_fs(char *uuid, size_t pagesize) ...@@ -227,14 +230,19 @@ static int tmem_cleancache_init_shared_fs(char *uuid, size_t pagesize)
return xen_tmem_new_pool(shared_uuid, TMEM_POOL_SHARED, pagesize); return xen_tmem_new_pool(shared_uuid, TMEM_POOL_SHARED, pagesize);
} }
static bool __initdata use_cleancache = true; static bool disable_cleancache __read_mostly;
static bool disable_selfballooning __read_mostly;
#ifdef CONFIG_XEN_TMEM_MODULE
module_param(disable_cleancache, bool, S_IRUGO);
module_param(disable_selfballooning, bool, S_IRUGO);
#else
static int __init no_cleancache(char *s) static int __init no_cleancache(char *s)
{ {
use_cleancache = false; disable_cleancache = true;
return 1; return 1;
} }
__setup("nocleancache", no_cleancache); __setup("nocleancache", no_cleancache);
#endif
static struct cleancache_ops tmem_cleancache_ops = { static struct cleancache_ops tmem_cleancache_ops = {
.put_page = tmem_cleancache_put_page, .put_page = tmem_cleancache_put_page,
...@@ -353,14 +361,19 @@ static void tmem_frontswap_init(unsigned ignored) ...@@ -353,14 +361,19 @@ static void tmem_frontswap_init(unsigned ignored)
xen_tmem_new_pool(private, TMEM_POOL_PERSIST, PAGE_SIZE); xen_tmem_new_pool(private, TMEM_POOL_PERSIST, PAGE_SIZE);
} }
static bool __initdata use_frontswap = true; static bool disable_frontswap __read_mostly;
static bool disable_frontswap_selfshrinking __read_mostly;
#ifdef CONFIG_XEN_TMEM_MODULE
module_param(disable_frontswap, bool, S_IRUGO);
module_param(disable_frontswap_selfshrinking, bool, S_IRUGO);
#else
static int __init no_frontswap(char *s) static int __init no_frontswap(char *s)
{ {
use_frontswap = false; disable_frontswap = true;
return 1; return 1;
} }
__setup("nofrontswap", no_frontswap); __setup("nofrontswap", no_frontswap);
#endif
static struct frontswap_ops tmem_frontswap_ops = { static struct frontswap_ops tmem_frontswap_ops = {
.store = tmem_frontswap_store, .store = tmem_frontswap_store,
...@@ -369,14 +382,16 @@ static struct frontswap_ops tmem_frontswap_ops = { ...@@ -369,14 +382,16 @@ static struct frontswap_ops tmem_frontswap_ops = {
.invalidate_area = tmem_frontswap_flush_area, .invalidate_area = tmem_frontswap_flush_area,
.init = tmem_frontswap_init .init = tmem_frontswap_init
}; };
#else /* CONFIG_FRONTSWAP */
#define disable_frontswap_selfshrinking 1
#endif #endif
static int __init xen_tmem_init(void) static int xen_tmem_init(void)
{ {
if (!xen_domain()) if (!xen_domain())
return 0; return 0;
#ifdef CONFIG_FRONTSWAP #ifdef CONFIG_FRONTSWAP
if (tmem_enabled && use_frontswap) { if (tmem_enabled && !disable_frontswap) {
char *s = ""; char *s = "";
struct frontswap_ops *old_ops = struct frontswap_ops *old_ops =
frontswap_register_ops(&tmem_frontswap_ops); frontswap_register_ops(&tmem_frontswap_ops);
...@@ -390,7 +405,7 @@ static int __init xen_tmem_init(void) ...@@ -390,7 +405,7 @@ static int __init xen_tmem_init(void)
#endif #endif
#ifdef CONFIG_CLEANCACHE #ifdef CONFIG_CLEANCACHE
BUG_ON(sizeof(struct cleancache_filekey) != sizeof(struct tmem_oid)); BUG_ON(sizeof(struct cleancache_filekey) != sizeof(struct tmem_oid));
if (tmem_enabled && use_cleancache) { if (tmem_enabled && !disable_cleancache) {
char *s = ""; char *s = "";
struct cleancache_ops *old_ops = struct cleancache_ops *old_ops =
cleancache_register_ops(&tmem_cleancache_ops); cleancache_register_ops(&tmem_cleancache_ops);
...@@ -399,8 +414,15 @@ static int __init xen_tmem_init(void) ...@@ -399,8 +414,15 @@ static int __init xen_tmem_init(void)
printk(KERN_INFO "cleancache enabled, RAM provided by " printk(KERN_INFO "cleancache enabled, RAM provided by "
"Xen Transcendent Memory%s\n", s); "Xen Transcendent Memory%s\n", s);
} }
#endif
#ifdef CONFIG_XEN_SELFBALLOONING
xen_selfballoon_init(!disable_selfballooning,
!disable_frontswap_selfshrinking);
#endif #endif
return 0; return 0;
} }
module_init(xen_tmem_init) module_init(xen_tmem_init)
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Dan Magenheimer <dan.magenheimer@oracle.com>");
MODULE_DESCRIPTION("Shim to Xen transcendent memory");
...@@ -121,7 +121,7 @@ static DECLARE_DELAYED_WORK(selfballoon_worker, selfballoon_process); ...@@ -121,7 +121,7 @@ static DECLARE_DELAYED_WORK(selfballoon_worker, selfballoon_process);
static bool frontswap_selfshrinking __read_mostly; static bool frontswap_selfshrinking __read_mostly;
/* Enable/disable with kernel boot option. */ /* Enable/disable with kernel boot option. */
static bool use_frontswap_selfshrink __initdata = true; static bool use_frontswap_selfshrink = true;
/* /*
* The default values for the following parameters were deemed reasonable * The default values for the following parameters were deemed reasonable
...@@ -185,7 +185,7 @@ static int __init xen_nofrontswap_selfshrink_setup(char *s) ...@@ -185,7 +185,7 @@ static int __init xen_nofrontswap_selfshrink_setup(char *s)
__setup("noselfshrink", xen_nofrontswap_selfshrink_setup); __setup("noselfshrink", xen_nofrontswap_selfshrink_setup);
/* Disable with kernel boot option. */ /* Disable with kernel boot option. */
static bool use_selfballooning __initdata = true; static bool use_selfballooning = true;
static int __init xen_noselfballooning_setup(char *s) static int __init xen_noselfballooning_setup(char *s)
{ {
...@@ -196,7 +196,7 @@ static int __init xen_noselfballooning_setup(char *s) ...@@ -196,7 +196,7 @@ static int __init xen_noselfballooning_setup(char *s)
__setup("noselfballooning", xen_noselfballooning_setup); __setup("noselfballooning", xen_noselfballooning_setup);
#else /* !CONFIG_FRONTSWAP */ #else /* !CONFIG_FRONTSWAP */
/* Enable with kernel boot option. */ /* Enable with kernel boot option. */
static bool use_selfballooning __initdata = false; static bool use_selfballooning;
static int __init xen_selfballooning_setup(char *s) static int __init xen_selfballooning_setup(char *s)
{ {
...@@ -537,7 +537,7 @@ int register_xen_selfballooning(struct device *dev) ...@@ -537,7 +537,7 @@ int register_xen_selfballooning(struct device *dev)
} }
EXPORT_SYMBOL(register_xen_selfballooning); EXPORT_SYMBOL(register_xen_selfballooning);
static int __init xen_selfballoon_init(void) int xen_selfballoon_init(bool use_selfballooning, bool use_frontswap_selfshrink)
{ {
bool enable = false; bool enable = false;
...@@ -571,7 +571,4 @@ static int __init xen_selfballoon_init(void) ...@@ -571,7 +571,4 @@ static int __init xen_selfballoon_init(void)
return 0; return 0;
} }
EXPORT_SYMBOL(xen_selfballoon_init);
subsys_initcall(xen_selfballoon_init);
MODULE_LICENSE("GPL");
...@@ -3,7 +3,15 @@ ...@@ -3,7 +3,15 @@
#include <linux/types.h> #include <linux/types.h>
#ifdef CONFIG_XEN_TMEM_MODULE
#define tmem_enabled true
#else
/* defined in drivers/xen/tmem.c */ /* defined in drivers/xen/tmem.c */
extern bool tmem_enabled; extern bool tmem_enabled;
#endif
#ifdef CONFIG_XEN_SELFBALLOONING
extern int xen_selfballoon_init(bool, bool);
#endif
#endif /* _XEN_TMEM_H */ #endif /* _XEN_TMEM_H */
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