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Message-Id: <1359750184-23408-6-git-send-email-konrad.wilk@oracle.com>
Date: Fri, 1 Feb 2013 15:22:54 -0500
From: Konrad Rzeszutek Wilk <konrad@...nel.org>
To: dan.magenheimer@...cle.com, konrad.wilk@...cle.com,
sjenning@...ux.vnet.ibm.com, gregkh@...uxfoundation.org,
akpm@...ux-foundation.org, ngupta@...are.org,
rcj@...ux.vnet.ibm.com, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org
Subject: [PATCH 05/15] staging: zcache: enable ramster to be built/loaded as a module
From: Dan Magenheimer <dan.magenheimer@...cle.com>
Enable module support for ramster. 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.
Signed-off-by: Dan Magenheimer <dan.magenheimer@...cle.com>
[v1: Fixed compile issues since ramster_init now has four arguments]
[v2: Fixed rebase on ramster->zcache move]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
---
drivers/staging/zcache/ramster.h | 6 ++++-
drivers/staging/zcache/ramster/nodemanager.c | 9 ++++---
drivers/staging/zcache/ramster/ramster.c | 29 ++++++++++++++++++----
drivers/staging/zcache/ramster/ramster.h | 2 +-
.../staging/zcache/ramster/ramster_nodemanager.h | 2 ++
drivers/staging/zcache/zcache-main.c | 2 +-
6 files changed, 38 insertions(+), 12 deletions(-)
diff --git a/drivers/staging/zcache/ramster.h b/drivers/staging/zcache/ramster.h
index 1b71aea..e1f91d5 100644
--- a/drivers/staging/zcache/ramster.h
+++ b/drivers/staging/zcache/ramster.h
@@ -11,10 +11,14 @@
#ifndef _ZCACHE_RAMSTER_H_
#define _ZCACHE_RAMSTER_H_
+#ifdef CONFIG_RAMSTER_MODULE
+#define CONFIG_RAMSTER
+#endif
+
#ifdef CONFIG_RAMSTER
#include "ramster/ramster.h"
#else
-static inline void ramster_init(bool x, bool y, bool z)
+static inline void ramster_init(bool x, bool y, bool z, bool w)
{
}
diff --git a/drivers/staging/zcache/ramster/nodemanager.c b/drivers/staging/zcache/ramster/nodemanager.c
index c0f4815..2cfe933 100644
--- a/drivers/staging/zcache/ramster/nodemanager.c
+++ b/drivers/staging/zcache/ramster/nodemanager.c
@@ -949,7 +949,7 @@ static void __exit exit_r2nm(void)
r2hb_exit();
}
-static int __init init_r2nm(void)
+int r2nm_init(void)
{
int ret = -1;
@@ -986,10 +986,11 @@ out_r2hb:
out:
return ret;
}
+EXPORT_SYMBOL_GPL(r2nm_init);
MODULE_AUTHOR("Oracle");
MODULE_LICENSE("GPL");
-/* module_init(init_r2nm) */
-late_initcall(init_r2nm);
-/* module_exit(exit_r2nm) */
+#ifndef CONFIG_RAMSTER_MODULE
+late_initcall(r2nm_init);
+#endif
diff --git a/drivers/staging/zcache/ramster/ramster.c b/drivers/staging/zcache/ramster/ramster.c
index c06709f..491ec70 100644
--- a/drivers/staging/zcache/ramster/ramster.c
+++ b/drivers/staging/zcache/ramster/ramster.c
@@ -92,7 +92,7 @@ static unsigned long ramster_remote_page_flushes_failed;
#include <linux/debugfs.h>
#define zdfs debugfs_create_size_t
#define zdfs64 debugfs_create_u64
-static int __init ramster_debugfs_init(void)
+static int ramster_debugfs_init(void)
{
struct dentry *root = debugfs_create_dir("ramster", NULL);
if (root == NULL)
@@ -191,6 +191,7 @@ int ramster_do_preload_flnode(struct tmem_pool *pool)
kmem_cache_free(ramster_flnode_cache, flnode);
return ret;
}
+EXPORT_SYMBOL_GPL(ramster_do_preload_flnode);
/*
* Called by the message handler after a (still compressed) page has been
@@ -458,6 +459,7 @@ void *ramster_pampd_free(void *pampd, struct tmem_pool *pool,
}
return local_pampd;
}
+EXPORT_SYMBOL_GPL(ramster_pampd_free);
void ramster_count_foreign_pages(bool eph, int count)
{
@@ -489,6 +491,7 @@ void ramster_count_foreign_pages(bool eph, int count)
ramster_foreign_pers_pages = c;
}
}
+EXPORT_SYMBOL_GPL(ramster_count_foreign_pages);
/*
* For now, just push over a few pages every few seconds to
@@ -674,7 +677,7 @@ requeue:
ramster_remotify_queue_delayed_work(HZ);
}
-void __init ramster_remotify_init(void)
+void ramster_remotify_init(void)
{
unsigned long n = 60UL;
ramster_remotify_workqueue =
@@ -849,8 +852,10 @@ static bool frontswap_selfshrinking __read_mostly;
static void selfshrink_process(struct work_struct *work);
static DECLARE_DELAYED_WORK(selfshrink_worker, selfshrink_process);
+#ifndef CONFIG_RAMSTER_MODULE
/* Enable/disable with kernel boot option. */
static bool use_frontswap_selfshrink __initdata = true;
+#endif
/*
* The default values for the following parameters were deemed reasonable
@@ -905,6 +910,7 @@ static void frontswap_selfshrink(void)
frontswap_shrink(tgt_frontswap_pages);
}
+#ifndef CONFIG_RAMSTER_MODULE
static int __init ramster_nofrontswap_selfshrink_setup(char *s)
{
use_frontswap_selfshrink = false;
@@ -912,6 +918,7 @@ static int __init ramster_nofrontswap_selfshrink_setup(char *s)
}
__setup("noselfshrink", ramster_nofrontswap_selfshrink_setup);
+#endif
static void selfshrink_process(struct work_struct *work)
{
@@ -930,6 +937,7 @@ void ramster_cpu_up(int cpu)
per_cpu(ramster_remoteputmem1, cpu) = p1;
per_cpu(ramster_remoteputmem2, cpu) = p2;
}
+EXPORT_SYMBOL_GPL(ramster_cpu_up);
void ramster_cpu_down(int cpu)
{
@@ -945,6 +953,7 @@ void ramster_cpu_down(int cpu)
kp->flnode = NULL;
}
}
+EXPORT_SYMBOL_GPL(ramster_cpu_down);
void ramster_register_pamops(struct tmem_pamops *pamops)
{
@@ -955,9 +964,11 @@ void ramster_register_pamops(struct tmem_pamops *pamops)
pamops->repatriate = ramster_pampd_repatriate;
pamops->repatriate_preload = ramster_pampd_repatriate_preload;
}
+EXPORT_SYMBOL_GPL(ramster_register_pamops);
-void __init ramster_init(bool cleancache, bool frontswap,
- bool frontswap_exclusive_gets)
+void ramster_init(bool cleancache, bool frontswap,
+ bool frontswap_exclusive_gets,
+ bool frontswap_selfshrink)
{
int ret = 0;
@@ -972,10 +983,17 @@ void __init ramster_init(bool cleancache, bool frontswap,
if (ret)
pr_err("ramster: can't create sysfs for ramster\n");
(void)r2net_register_handlers();
+#ifdef CONFIG_RAMSTER_MODULE
+ ret = r2nm_init();
+ if (ret)
+ pr_err("ramster: can't init r2net\n");
+ frontswap_selfshrinking = frontswap_selfshrink;
+#else
+ frontswap_selfshrinking = use_frontswap_selfshrink;
+#endif
INIT_LIST_HEAD(&ramster_rem_op_list);
ramster_flnode_cache = kmem_cache_create("ramster_flnode",
sizeof(struct flushlist_node), 0, 0, NULL);
- frontswap_selfshrinking = use_frontswap_selfshrink;
if (frontswap_selfshrinking) {
pr_info("ramster: Initializing frontswap selfshrink driver.\n");
schedule_delayed_work(&selfshrink_worker,
@@ -983,3 +1001,4 @@ void __init ramster_init(bool cleancache, bool frontswap,
}
ramster_remotify_init();
}
+EXPORT_SYMBOL_GPL(ramster_init);
diff --git a/drivers/staging/zcache/ramster/ramster.h b/drivers/staging/zcache/ramster/ramster.h
index 12ae56f..6d41a7a 100644
--- a/drivers/staging/zcache/ramster/ramster.h
+++ b/drivers/staging/zcache/ramster/ramster.h
@@ -147,7 +147,7 @@ extern int r2net_register_handlers(void);
extern int r2net_remote_target_node_set(int);
extern int ramster_remotify_pageframe(bool);
-extern void ramster_init(bool, bool, bool);
+extern void ramster_init(bool, bool, bool, bool);
extern void ramster_register_pamops(struct tmem_pamops *);
extern int ramster_localify(int, struct tmem_oid *oidp, uint32_t, char *,
unsigned int, void *);
diff --git a/drivers/staging/zcache/ramster/ramster_nodemanager.h b/drivers/staging/zcache/ramster/ramster_nodemanager.h
index 49f879d..dbaae34 100644
--- a/drivers/staging/zcache/ramster/ramster_nodemanager.h
+++ b/drivers/staging/zcache/ramster/ramster_nodemanager.h
@@ -36,4 +36,6 @@
/* host name, group name, cluster name all 64 bytes */
#define R2NM_MAX_NAME_LEN 64 /* __NEW_UTS_LEN */
+extern int r2nm_init(void);
+
#endif /* _RAMSTER_NODEMANAGER_H */
diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c
index b5a9dd0..bb59b78 100644
--- a/drivers/staging/zcache/zcache-main.c
+++ b/drivers/staging/zcache/zcache-main.c
@@ -1811,7 +1811,7 @@ static int __init zcache_init(void)
}
if (ramster_enabled)
ramster_init(!disable_cleancache, !disable_frontswap,
- frontswap_has_exclusive_gets);
+ frontswap_has_exclusive_gets, false);
out:
return ret;
}
--
1.7.11.7
--
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