+ zsmalloc-add-ops-fields-to-zs_pool-to-store-evict-handlers.patch added to mm-unstable branch

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The patch titled
     Subject: zsmalloc: add ops fields to zs_pool to store evict handlers
has been added to the -mm mm-unstable branch.  Its filename is
     zsmalloc-add-ops-fields-to-zs_pool-to-store-evict-handlers.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/zsmalloc-add-ops-fields-to-zs_pool-to-store-evict-handlers.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Nhat Pham <nphamcs@xxxxxxxxx>
Subject: zsmalloc: add ops fields to zs_pool to store evict handlers
Date: Tue, 8 Nov 2022 11:32:06 -0800

This adds fields to zs_pool to store evict handlers for writeback,
analogous to the zbud allocator.

Link: https://lkml.kernel.org/r/20221108193207.3297327-5-nphamcs@xxxxxxxxx
Signed-off-by: Nhat Pham <nphamcs@xxxxxxxxx>
Cc: Dan Streetman <ddstreet@xxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Nitin Gupta <ngupta@xxxxxxxxxx>
Cc: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Cc: Seth Jennings <sjenning@xxxxxxxxxx>
Cc: Vitaly Wool <vitaly.wool@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/zsmalloc.c |   39 ++++++++++++++++++++++++++++++++++++++-
 1 file changed, 38 insertions(+), 1 deletion(-)

--- a/mm/zsmalloc.c~zsmalloc-add-ops-fields-to-zs_pool-to-store-evict-handlers
+++ a/mm/zsmalloc.c
@@ -213,6 +213,12 @@ struct link_free {
 	};
 };
 
+struct zs_pool;
+
+struct zs_ops {
+	int (*evict)(struct zs_pool *pool, unsigned long handle);
+};
+
 struct zs_pool {
 	const char *name;
 
@@ -234,6 +240,12 @@ 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
@@ -371,6 +383,18 @@ static void record_obj(unsigned long han
 
 #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)
@@ -380,7 +404,20 @@ static void *zs_zpool_create(const char
 	 * different contexts and its caller must provide a valid
 	 * gfp mask.
 	 */
-	return zs_create_pool(name, ZS_DEFAULT_PAGES_PER_ZSPAGE);
+	struct zs_pool *pool;
+
+	pool = zs_create_pool(name, ZS_DEFAULT_PAGES_PER_ZSPAGE);
+	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)
_

Patches currently in -mm which might be from nphamcs@xxxxxxxxx are

zsmalloc-consolidate-zs_pools-migrate_lock-and-size_classs-locks.patch
zsmalloc-add-a-lru-to-zs_pool-to-keep-track-of-zspages-in-lru-order.patch
zsmalloc-add-ops-fields-to-zs_pool-to-store-evict-handlers.patch
zsmalloc-implement-writeback-mechanism-for-zsmalloc.patch




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