+ zsmalloc-make-huge-class-watermark-zs_pool-member.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: zsmalloc: make huge class watermark zs_pool member
has been added to the -mm mm-unstable branch.  Its filename is
     zsmalloc-make-huge-class-watermark-zs_pool-member.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/zsmalloc-make-huge-class-watermark-zs_pool-member.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: Sergey Senozhatsky <senozhatsky@chromium.org>
Subject: zsmalloc: make huge class watermark zs_pool member
Date: Thu, 27 Oct 2022 13:26:46 +0900

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.

Link: https://lkml.kernel.org/r/20221027042651.234524-5-senozhatsky@chromium.org
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Alexey Romanov <avromanov@sberdevices.ru>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---


--- a/mm/zsmalloc.c~zsmalloc-make-huge-class-watermark-zs_pool-member
+++ a/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);
 
@@ -2264,8 +2264,8 @@ struct zs_pool *zs_create_pool(const cha
 		 * 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()
@@ -2275,7 +2275,7 @@ struct zs_pool *zs_create_pool(const cha
 			 * 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);
 		}
 
 		/*
_

Patches currently in -mm which might be from senozhatsky@chromium.org are

zram-preparation-for-multi-zcomp-support.patch
zram-add-recompression-algorithm-sysfs-knob.patch
zram-factor-out-wb-and-non-wb-zram-read-functions.patch
zram-introduce-recompress-sysfs-knob.patch
documentation-add-recompression-documentation.patch
zram-add-recompression-algorithm-choice-to-kconfig.patch
zram-add-recompress-flag-to-read_block_state.patch
zram-clarify-writeback_store-comment.patch
zram-use-is_err_value-to-check-for-zs_malloc-errors.patch
zsmalloc-turn-zspage-order-into-runtime-variable.patch
zsmalloc-move-away-from-page-order-defines.patch
zsmalloc-make-huge-class-watermark-zs_pool-member.patch
zram-huge-size-watermark-cannot-be-global.patch
zsmalloc-pass-limit-on-pages-per-zspage-to-zs_create_pool.patch
zram-add-pages_per_pool_page-device-attribute.patch
documentation-document-zram-pages_per_pool_page-attribute.patch
zsmalloc-break-out-of-loop-when-found-perfect-zspage-order.patch