diff options
Diffstat (limited to 'drivers/xen/tmem.c')
| -rw-r--r-- | drivers/xen/tmem.c | 103 |
1 files changed, 49 insertions, 54 deletions
diff --git a/drivers/xen/tmem.c b/drivers/xen/tmem.c index e3600be4e7fa..83b5c53bec6b 100644 --- a/drivers/xen/tmem.c +++ b/drivers/xen/tmem.c @@ -5,17 +5,15 @@ * Author: Dan Magenheimer */ +#define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt + #include <linux/module.h> #include <linux/kernel.h> #include <linux/types.h> #include <linux/init.h> #include <linux/pagemap.h> #include <linux/cleancache.h> - -/* temporary ifdef until include/linux/frontswap.h is upstream */ -#ifdef CONFIG_FRONTSWAP #include <linux/frontswap.h> -#endif #include <xen/xen.h> #include <xen/interface/xen.h> @@ -24,6 +22,36 @@ #include <asm/xen/hypervisor.h> #include <xen/tmem.h> +#ifndef CONFIG_XEN_TMEM_MODULE +bool __read_mostly tmem_enabled = false; + +static int __init enable_tmem(char *s) +{ + tmem_enabled = true; + return 1; +} +__setup("tmem", enable_tmem); +#endif + +#ifdef CONFIG_CLEANCACHE +static bool cleancache __read_mostly = true; +module_param(cleancache, bool, S_IRUGO); +static bool selfballooning __read_mostly = true; +module_param(selfballooning, bool, S_IRUGO); +#endif /* CONFIG_CLEANCACHE */ + +#ifdef CONFIG_FRONTSWAP +static bool frontswap __read_mostly = true; +module_param(frontswap, bool, S_IRUGO); +#else /* CONFIG_FRONTSWAP */ +#define frontswap (0) +#endif /* CONFIG_FRONTSWAP */ + +#ifdef CONFIG_XEN_SELFBALLOONING +static bool selfshrinking __read_mostly = true; +module_param(selfshrinking, bool, S_IRUGO); +#endif /* CONFIG_XEN_SELFBALLOONING */ + #define TMEM_CONTROL 0 #define TMEM_NEW_POOL 1 #define TMEM_DESTROY_POOL 2 @@ -129,16 +157,6 @@ 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); } -#ifndef CONFIG_XEN_TMEM_MODULE -bool __read_mostly tmem_enabled = false; - -static int __init enable_tmem(char *s) -{ - tmem_enabled = true; - return 1; -} -__setup("tmem", enable_tmem); -#endif #ifdef CONFIG_CLEANCACHE static int xen_tmem_destroy_pool(u32 pool_id) @@ -230,20 +248,6 @@ static int tmem_cleancache_init_shared_fs(char *uuid, size_t pagesize) return xen_tmem_new_pool(shared_uuid, TMEM_POOL_SHARED, pagesize); } -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) -{ - disable_cleancache = true; - return 1; -} -__setup("nocleancache", no_cleancache); -#endif - static struct cleancache_ops tmem_cleancache_ops = { .put_page = tmem_cleancache_put_page, .get_page = tmem_cleancache_get_page, @@ -361,20 +365,6 @@ static void tmem_frontswap_init(unsigned ignored) xen_tmem_new_pool(private, TMEM_POOL_PERSIST, PAGE_SIZE); } -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) -{ - disable_frontswap = true; - return 1; -} -__setup("nofrontswap", no_frontswap); -#endif - static struct frontswap_ops tmem_frontswap_ops = { .store = tmem_frontswap_store, .load = tmem_frontswap_load, @@ -382,8 +372,6 @@ static struct frontswap_ops tmem_frontswap_ops = { .invalidate_area = tmem_frontswap_flush_area, .init = tmem_frontswap_init }; -#else /* CONFIG_FRONTSWAP */ -#define disable_frontswap_selfshrinking 1 #endif static int xen_tmem_init(void) @@ -391,36 +379,43 @@ static int xen_tmem_init(void) if (!xen_domain()) return 0; #ifdef CONFIG_FRONTSWAP - if (tmem_enabled && !disable_frontswap) { + if (tmem_enabled && frontswap) { char *s = ""; - struct frontswap_ops *old_ops = - frontswap_register_ops(&tmem_frontswap_ops); + struct frontswap_ops *old_ops; tmem_frontswap_poolid = -1; + old_ops = frontswap_register_ops(&tmem_frontswap_ops); if (IS_ERR(old_ops) || old_ops) { if (IS_ERR(old_ops)) return PTR_ERR(old_ops); s = " (WARNING: frontswap_ops overridden)"; } - printk(KERN_INFO "frontswap enabled, RAM provided by " - "Xen Transcendent Memory%s\n", s); + pr_info("frontswap enabled, RAM provided by Xen Transcendent Memory%s\n", + s); } #endif #ifdef CONFIG_CLEANCACHE BUG_ON(sizeof(struct cleancache_filekey) != sizeof(struct tmem_oid)); - if (tmem_enabled && !disable_cleancache) { + if (tmem_enabled && cleancache) { char *s = ""; struct cleancache_ops *old_ops = cleancache_register_ops(&tmem_cleancache_ops); if (old_ops) s = " (WARNING: cleancache_ops overridden)"; - printk(KERN_INFO "cleancache enabled, RAM provided by " - "Xen Transcendent Memory%s\n", s); + pr_info("cleancache enabled, RAM provided by Xen Transcendent Memory%s\n", + s); } #endif #ifdef CONFIG_XEN_SELFBALLOONING - xen_selfballoon_init(!disable_selfballooning, - !disable_frontswap_selfshrinking); + /* + * There is no point of driving pages to the swap system if they + * aren't going anywhere in tmem universe. + */ + if (!frontswap) { + selfshrinking = false; + selfballooning = false; + } + xen_selfballoon_init(selfballooning, selfshrinking); #endif return 0; } |