linux-kernel - [PATCH] mm/slub: fix missing ALLOC

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Message-ID: <20200811022427.1363-1-wuyun.wu@huawei.com>
Date:   Tue, 11 Aug 2020 10:24:24 +0800
From:   <wuyun.wu@...wei.com>
To:     Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        "David Rientjes" <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        "Andrew Morton" <akpm@...ux-foundation.org>
CC:     <hewenliang4@...wei.com>, <hushiyuan@...wei.com>,
        Abel Wu <wuyun.wu@...wei.com>,
        "open list:SLAB ALLOCATOR" <linux-mm@...ck.org>,
        "open list" <linux-kernel@...r.kernel.org>
Subject: [PATCH] mm/slub: fix missing ALLOC_SLOWPATH stat when bulk alloc

From: Abel Wu <wuyun.wu@...wei.com>

The ALLOC_SLOWPATH statistics is missing in bulk allocation now.
Fix it by doing statistics in alloc slow path.

Signed-off-by: Abel Wu <wuyun.wu@...wei.com>
---
 mm/slub.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/slub.c b/mm/slub.c
index df93a5a0e9a4..5d89e4064f83 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2600,6 +2600,8 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
 	void *freelist;
 	struct page *page;
 
+	stat(s, ALLOC_SLOWPATH);
+
 	page = c->page;
 	if (!page) {
 		/*
@@ -2788,7 +2790,6 @@ static __always_inline void *slab_alloc_node(struct kmem_cache *s,
 	page = c->page;
 	if (unlikely(!object || !node_match(page, node))) {
 		object = __slab_alloc(s, gfpflags, node, addr, c);
-		stat(s, ALLOC_SLOWPATH);
 	} else {
 		void *next_object = get_freepointer_safe(s, object);
 
-- 
2.28.0.windows.1