linux-kernel - [PATCH v6 5/6] zsmalloc: Add zpool_ops field to zs

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Date:   Fri, 18 Nov 2022 16:15:35 -0800
From:   Nhat Pham <nphamcs@...il.com>
To:     akpm@...ux-foundation.org
Cc:     hannes@...xchg.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, minchan@...nel.org,
        ngupta@...are.org, senozhatsky@...omium.org, sjenning@...hat.com,
        ddstreet@...e.org, vitaly.wool@...sulko.com
Subject: [PATCH v6 5/6] zsmalloc: Add zpool_ops field to zs_pool to store evict handlers

This adds a new field to zs_pool to store evict handlers for writeback,
analogous to the zbud allocator.

Signed-off-by: Nhat Pham <nphamcs@...il.com>
Acked-by: Minchan Kim <minchan@...nel.org>
---
 mm/zsmalloc.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 7dd464b5a6a5..9920f3584511 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -242,6 +242,8 @@ struct zs_pool {
 #ifdef CONFIG_ZPOOL
 	/* List tracking the zspages in LRU order by most recently added object */
 	struct list_head lru;
+	struct zpool *zpool;
+	const struct zpool_ops *zpool_ops;
 #endif

 #ifdef CONFIG_ZSMALLOC_STAT
@@ -382,7 +384,14 @@ 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;
+	}
+
+	return pool;
 }

 static void zs_zpool_destroy(void *pool)
--
2.30.2