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From:   Sergey Senozhatsky <senozhatsky@chromium.org>
To:     Andrew Morton <akpm@linux-foundation.org>,
        Minchan Kim <minchan@kernel.org>
Cc:     Nitin Gupta <ngupta@vflare.org>, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, Sergey Senozhatsky <senozhatsky@chromium.org>
Subject: [PATCHv4 4/9] zsmalloc: make huge class watermark zs_pool member
Date:   Mon, 31 Oct 2022 14:41:03 +0900
Message-Id: <20221031054108.541190-5-senozhatsky@chromium.org>
In-Reply-To: <20221031054108.541190-1-senozhatsky@chromium.org>
References: <20221031054108.541190-1-senozhatsky@chromium.org>
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We will permit per-pool configuration of pages per-zspage value,
which changes characteristics of the classes and moves around
huge class size watermark. Thus huge class size needs to be
a per-pool variable.

Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
---
 mm/zsmalloc.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 5f79223e7bfe..d329bd673baa 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -178,7 +178,6 @@ static struct dentry *zs_stat_root;
  * (see: fix_fullness_group())
  */
 static const int fullness_threshold_frac = 4;
-static size_t huge_class_size;
 
 struct size_class {
 	spinlock_t lock;
@@ -227,6 +226,7 @@ struct zs_pool {
 
 	u32 num_size_classes;
 	u32 min_alloc_size;
+	size_t huge_class_size;
 
 	struct zs_pool_stats stats;
 
@@ -1350,7 +1350,7 @@ EXPORT_SYMBOL_GPL(zs_unmap_object);
  */
 size_t zs_huge_class_size(struct zs_pool *pool)
 {
-	return huge_class_size;
+	return pool->huge_class_size;
 }
 EXPORT_SYMBOL_GPL(zs_huge_class_size);
 
@@ -2262,8 +2262,8 @@ struct zs_pool *zs_create_pool(const char *name)
 		 * endup in the huge class.
 		 */
 		if (pages_per_zspage != 1 && objs_per_zspage != 1 &&
-				!huge_class_size) {
-			huge_class_size = size;
+				!pool->huge_class_size) {
+			pool->huge_class_size = size;
 			/*
 			 * The object uses ZS_HANDLE_SIZE bytes to store the
 			 * handle. We need to subtract it, because zs_malloc()
@@ -2273,7 +2273,7 @@ struct zs_pool *zs_create_pool(const char *name)
 			 * class because it grows by ZS_HANDLE_SIZE extra bytes
 			 * right before class lookup.
 			 */
-			huge_class_size -= (ZS_HANDLE_SIZE - 1);
+			pool->huge_class_size -= (ZS_HANDLE_SIZE - 1);
 		}
 
 		/*
-- 
2.38.1.273.g43a17bfeac-goog