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Message-Id: <1433263765-30772-1-git-send-email-ddstreet@ieee.org>
Date: Tue, 2 Jun 2015 12:49:25 -0400
From: Dan Streetman <ddstreet@...e.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Seth Jennings <sjennings@...iantweb.net>,
Minchan Kim <minchan@...nel.org>,
Nitin Gupta <ngupta@...are.org>, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, Dan Streetman <ddstreet@...e.org>
Subject: [PATCH] zpool: remove zpool_evict
Remove zpool_evict helper function. As zbud is currently the only zpool
implementation that supports eviction, add zpool and zpool_ops references
to struct zbud_pool and directly call zpool_ops->evict(zpool, handle) on
eviction.
Currently zpool provides the zpool_evict helper which locks the zpool list
lock and searches through all pools to find the specific one matching the
caller, and call the corresponding zpool_ops->evict function. However,
this is unnecessary, as the zbud pool can simply keep a reference to the
zpool that created it, as well as the zpool_ops, and directly call the
zpool_ops->evict function, when it needs to evict a page. This avoids
a spinlock and list search in zpool for each eviction.
Signed-off-by: Dan Streetman <ddstreet@...e.org>
---
include/linux/zpool.h | 5 ++---
mm/zbud.c | 23 +++++++++++++++++++----
mm/zpool.c | 29 +----------------------------
mm/zsmalloc.c | 3 ++-
4 files changed, 24 insertions(+), 36 deletions(-)
diff --git a/include/linux/zpool.h b/include/linux/zpool.h
index 56529b3..d30eff3 100644
--- a/include/linux/zpool.h
+++ b/include/linux/zpool.h
@@ -81,7 +81,8 @@ struct zpool_driver {
atomic_t refcount;
struct list_head list;
- void *(*create)(char *name, gfp_t gfp, struct zpool_ops *ops);
+ void *(*create)(char *name, gfp_t gfp, struct zpool_ops *ops,
+ struct zpool *zpool);
void (*destroy)(void *pool);
int (*malloc)(void *pool, size_t size, gfp_t gfp,
@@ -102,6 +103,4 @@ void zpool_register_driver(struct zpool_driver *driver);
int zpool_unregister_driver(struct zpool_driver *driver);
-int zpool_evict(void *pool, unsigned long handle);
-
#endif
diff --git a/mm/zbud.c b/mm/zbud.c
index 2ee4e45..f3bf6f7 100644
--- a/mm/zbud.c
+++ b/mm/zbud.c
@@ -97,6 +97,10 @@ struct zbud_pool {
struct list_head lru;
u64 pages_nr;
struct zbud_ops *ops;
+#ifdef CONFIG_ZPOOL
+ struct zpool *zpool;
+ struct zpool_ops *zpool_ops;
+#endif
};
/*
@@ -123,7 +127,10 @@ struct zbud_header {
static int zbud_zpool_evict(struct zbud_pool *pool, unsigned long handle)
{
- return zpool_evict(pool, handle);
+ if (pool->zpool && pool->zpool_ops && pool->zpool_ops->evict)
+ return pool->zpool_ops->evict(pool->zpool, handle);
+ else
+ return -ENOENT;
}
static struct zbud_ops zbud_zpool_ops = {
@@ -131,9 +138,17 @@ static struct zbud_ops zbud_zpool_ops = {
};
static void *zbud_zpool_create(char *name, gfp_t gfp,
- struct zpool_ops *zpool_ops)
+ struct zpool_ops *zpool_ops,
+ struct zpool *zpool)
{
- return zbud_create_pool(gfp, zpool_ops ? &zbud_zpool_ops : NULL);
+ struct zbud_pool *pool;
+
+ pool = zbud_create_pool(gfp, zpool_ops ? &zbud_zpool_ops : NULL);
+ if (pool) {
+ pool->zpool = zpool;
+ pool->zpool_ops = zpool_ops;
+ }
+ return pool;
}
static void zbud_zpool_destroy(void *pool)
@@ -292,7 +307,7 @@ struct zbud_pool *zbud_create_pool(gfp_t gfp, struct zbud_ops *ops)
struct zbud_pool *pool;
int i;
- pool = kmalloc(sizeof(struct zbud_pool), gfp);
+ pool = kzalloc(sizeof(struct zbud_pool), gfp);
if (!pool)
return NULL;
spin_lock_init(&pool->lock);
diff --git a/mm/zpool.c b/mm/zpool.c
index bacdab6..6a19c97 100644
--- a/mm/zpool.c
+++ b/mm/zpool.c
@@ -73,33 +73,6 @@ int zpool_unregister_driver(struct zpool_driver *driver)
}
EXPORT_SYMBOL(zpool_unregister_driver);
-/**
- * zpool_evict() - evict callback from a zpool implementation.
- * @pool: pool to evict from.
- * @handle: handle to evict.
- *
- * This can be used by zpool implementations to call the
- * user's evict zpool_ops struct evict callback.
- */
-int zpool_evict(void *pool, unsigned long handle)
-{
- struct zpool *zpool;
-
- spin_lock(&pools_lock);
- list_for_each_entry(zpool, &pools_head, list) {
- if (zpool->pool == pool) {
- spin_unlock(&pools_lock);
- if (!zpool->ops || !zpool->ops->evict)
- return -EINVAL;
- return zpool->ops->evict(zpool, handle);
- }
- }
- spin_unlock(&pools_lock);
-
- return -ENOENT;
-}
-EXPORT_SYMBOL(zpool_evict);
-
static struct zpool_driver *zpool_get_driver(char *type)
{
struct zpool_driver *driver;
@@ -170,7 +143,7 @@ struct zpool *zpool_create_pool(char *type, char *name, gfp_t gfp,
zpool->type = driver->type;
zpool->driver = driver;
- zpool->pool = driver->create(name, gfp, ops);
+ zpool->pool = driver->create(name, gfp, ops, zpool);
zpool->ops = ops;
if (!zpool->pool) {
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 08bd7a3..dd196c4 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -312,7 +312,8 @@ static void record_obj(unsigned long handle, unsigned long obj)
#ifdef CONFIG_ZPOOL
-static void *zs_zpool_create(char *name, gfp_t gfp, struct zpool_ops *zpool_ops)
+static void *zs_zpool_create(char *name, gfp_t gfp, struct zpool_ops *zpool_ops,
+ struct zpool *zpool)
{
return zs_create_pool(name, gfp);
}
--
2.1.0
--
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