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Subject[PATCH v3 4/5] zsmalloc: Add ops fields to zs_pool to store evict handlers
Date
This adds fields to zs_pool to store evict handlers for writeback,
analogous to the zbud allocator.

Signed-off-by: Nhat Pham <nphamcs@gmail.com>
---
mm/zsmalloc.c | 38 +++++++++++++++++++++++++++++++++++++-
1 file changed, 37 insertions(+), 1 deletion(-)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 600c40121544..ac86cffa62cd 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -225,6 +225,12 @@ struct link_free {
};
};

+struct zs_pool;
+
+struct zs_ops {
+ int (*evict)(struct zs_pool *pool, unsigned long handle);
+};
+
struct zs_pool {
const char *name;

@@ -242,6 +248,12 @@ struct zs_pool {
/* List tracking the zspages in LRU order by most recently added object */
struct list_head lru;

+#ifdef CONFIG_ZPOOL
+ const struct zs_ops *ops;
+ struct zpool *zpool;
+ const struct zpool_ops *zpool_ops;
+#endif
+
#ifdef CONFIG_ZSMALLOC_STAT
struct dentry *stat_dentry;
#endif
@@ -379,6 +391,18 @@ static void record_obj(unsigned long handle, unsigned long obj)

#ifdef CONFIG_ZPOOL

+static int zs_zpool_evict(struct zs_pool *pool, unsigned long handle)
+{
+ if (pool->zpool && pool->zpool_ops && pool->zpool_ops->evict)
+ return pool->zpool_ops->evict(pool->zpool, handle);
+ else
+ return -ENOENT;
+}
+
+static const struct zs_ops zs_zpool_ops = {
+ .evict = zs_zpool_evict
+};
+
static void *zs_zpool_create(const char *name, gfp_t gfp,
const struct zpool_ops *zpool_ops,
struct zpool *zpool)
@@ -388,7 +412,19 @@ static void *zs_zpool_create(const char *name, gfp_t gfp,
* different contexts and its caller must provide a valid
* gfp mask.
*/
- return zs_create_pool(name);
+ struct zs_pool *pool = zs_create_pool(name);
+
+ if (pool) {
+ pool->zpool = zpool;
+ pool->zpool_ops = zpool_ops;
+
+ if (zpool_ops)
+ pool->ops = &zs_zpool_ops;
+ else
+ pool->ops = NULL;
+ }
+
+ return pool;
}

static void zs_zpool_destroy(void *pool)
--
2.30.2
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