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Message-ID: <20240906035103.2435557-1-senozhatsky@chromium.org> Date: Fri, 6 Sep 2024 12:45:44 +0900 From: Sergey Senozhatsky <senozhatsky@...omium.org> To: Andrew Morton <akpm@...ux-foundation.org> Cc: Minchan Kim <minchan@...nel.org>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, Sergey Senozhatsky <senozhatsky@...omium.org> Subject: [PATCHv2] zsmalloc: use unique zsmalloc caches names Each zsmalloc pool maintains several named kmem-caches for zs_handle-s and zspage-s. On a system with multiple zsmalloc pools and CONFIG_DEBUG_VM this triggers kmem_cache_sanity_check(): kmem_cache of name 'zspage' already exists WARNING: at mm/slab_common.c:108 do_kmem_cache_create_usercopy+0xb5/0x310 ... kmem_cache of name 'zs_handle' already exists WARNING: at mm/slab_common.c:108 do_kmem_cache_create_usercopy+0xb5/0x310 ... We provide zram device name when init its zsmalloc pool, so we can use that same name for zsmalloc caches and, hence, create unique names that can easily be linked to zram device that has created them. So instead of having this cat /proc/slabinfo slabinfo - version: 2.1 zspage 46 46 ... zs_handle 128 128 ... zspage 34270 34270 ... zs_handle 34816 34816 ... zspage 0 0 ... zs_handle 0 0 ... We now have this cat /proc/slabinfo slabinfo - version: 2.1 zspage-zram2 46 46 ... zs_handle-zram2 128 128 ... zspage-zram0 34270 34270 ... zs_handle-zram0 34816 34816 ... zspage-zram1 0 0 ... zs_handle-zram1 0 0 ... Fixes: 2e40e163a25a ("zsmalloc: decouple handle and object") Signed-off-by: Sergey Senozhatsky <senozhatsky@...omium.org> --- mm/zsmalloc.c | 23 +++++++++++++++++------ 1 file changed, 17 insertions(+), 6 deletions(-) diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c index 73a3ec5b21ad..16a07def09c9 100644 --- a/mm/zsmalloc.c +++ b/mm/zsmalloc.c @@ -54,6 +54,7 @@ #include <linux/vmalloc.h> #include <linux/preempt.h> #include <linux/spinlock.h> +#include <linux/sprintf.h> #include <linux/shrinker.h> #include <linux/types.h> #include <linux/debugfs.h> @@ -293,17 +294,27 @@ static void SetZsPageMovable(struct zs_pool *pool, struct zspage *zspage) {} static int create_cache(struct zs_pool *pool) { - pool->handle_cachep = kmem_cache_create("zs_handle", ZS_HANDLE_SIZE, - 0, 0, NULL); + char *name; + + name = kasprintf(GFP_KERNEL, "zs_handle-%s", pool->name); + if (!name) + return -ENOMEM; + pool->handle_cachep = kmem_cache_create(name, ZS_HANDLE_SIZE, + 0, 0, NULL); + kfree(name); if (!pool->handle_cachep) - return 1; + return -EINVAL; - pool->zspage_cachep = kmem_cache_create("zspage", sizeof(struct zspage), - 0, 0, NULL); + name = kasprintf(GFP_KERNEL, "zspage-%s", pool->name); + if (!name) + return -ENOMEM; + pool->zspage_cachep = kmem_cache_create(name, sizeof(struct zspage), + 0, 0, NULL); + kfree(name); if (!pool->zspage_cachep) { kmem_cache_destroy(pool->handle_cachep); pool->handle_cachep = NULL; - return 1; + return -EINVAL; } return 0; -- 2.46.0.469.g59c65b2a67-goog
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