From: Yu Zhao <yuzhao@google.com>
To: Christoph Lameter <cl@linux.com>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>,
"Kirill A . Shutemov" <kirill@shutemov.name>,
Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Yu Zhao <yuzhao@google.com>
Subject: [PATCH 3/3] mm: lock slub page when listing objects
Date: Wed, 11 Sep 2019 18:29:29 -0600
Message-ID: <20190912002929.78873-3-yuzhao@google.com> (raw)
In-Reply-To: <20190912002929.78873-1-yuzhao@google.com>
Though I have no idea what the side effect of a race would be,
apparently we want to prevent the free list from being changed
while debugging objects in general.
Signed-off-by: Yu Zhao <yuzhao@google.com>
---
mm/slub.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/mm/slub.c b/mm/slub.c
index f28072c9f2ce..2734a092bbff 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4594,10 +4594,14 @@ static void process_slab(struct loc_track *t, struct kmem_cache *s,
void *addr = page_address(page);
void *p;
+ slab_lock(page);
+
get_map(s, page, map);
for_each_object(p, s, addr, page->objects)
if (!test_bit(slab_index(p, s, addr), map))
add_location(t, s, get_track(s, p, alloc));
+
+ slab_unlock(page);
}
static int list_locations(struct kmem_cache *s, char *buf,
--
2.23.0.162.g0b9fbb3734-goog
prev parent reply index
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-09 6:10 [PATCH] mm: avoid slub allocation while holding list_lock Yu Zhao
2019-09-09 16:00 ` Kirill A. Shutemov
[not found] ` <e5e25aa3-651d-92b4-ac82-c5011c66a7cb@I-love.SAKURA.ne.jp>
2019-09-09 21:39 ` Yu Zhao
[not found] ` <201909100141.x8A1fVdu048305@www262.sakura.ne.jp>
2019-09-10 2:16 ` Yu Zhao
2019-09-10 9:16 ` Kirill A. Shutemov
2019-09-11 14:13 ` Andrew Morton
2019-09-12 0:29 ` [PATCH 1/3] mm: correct mask size for slub page->objects Yu Zhao
2019-09-12 0:29 ` [PATCH 2/3] mm: avoid slub allocation while holding list_lock Yu Zhao
2019-09-12 0:44 ` Kirill A. Shutemov
2019-09-12 1:31 ` Yu Zhao
2019-09-12 2:31 ` [PATCH v2 1/4] mm: correct mask size for slub page->objects Yu Zhao
2019-09-12 2:31 ` [PATCH v2 2/4] mm: clean up validate_slab() Yu Zhao
2019-09-12 9:46 ` Kirill A. Shutemov
2019-09-12 2:31 ` [PATCH v2 3/4] mm: avoid slub allocation while holding list_lock Yu Zhao
2019-09-12 10:04 ` Kirill A. Shutemov
2019-09-12 2:31 ` [PATCH v2 4/4] mm: lock slub page when listing objects Yu Zhao
2019-09-12 10:06 ` Kirill A. Shutemov
2019-09-12 21:12 ` Yu Zhao
2019-09-13 14:58 ` Christopher Lameter
2019-09-12 9:40 ` [PATCH v2 1/4] mm: correct mask size for slub page->objects Kirill A. Shutemov
2019-09-12 21:11 ` Yu Zhao
2019-09-12 22:03 ` Kirill A. Shutemov
2019-09-14 0:07 ` [PATCH v3 1/2] mm: clean up validate_slab() Yu Zhao
2019-09-14 0:07 ` [PATCH v3 2/2] mm: avoid slub allocation while holding list_lock Yu Zhao
2019-09-16 8:39 ` [PATCH v3 1/2] mm: clean up validate_slab() Kirill A. Shutemov
2019-11-08 19:39 ` [PATCH v4 " Yu Zhao
2019-11-08 19:39 ` [PATCH v4 2/2] mm: avoid slub allocation while holding list_lock Yu Zhao
2019-11-09 20:52 ` Christopher Lameter
2019-11-09 23:01 ` Yu Zhao
2019-11-09 23:16 ` Christopher Lameter
2019-11-10 18:47 ` Yu Zhao
2019-11-11 15:47 ` Christopher Lameter
2019-11-11 15:55 ` [FIX] slub: Remove kmalloc under list_lock from list_slab_objects() V2 Christopher Lameter
2019-11-30 23:09 ` Andrew Morton
2019-12-02 15:12 ` Christopher Lameter
2019-12-07 22:03 ` Yu Zhao
2020-01-10 14:11 ` Vlastimil Babka
[not found] ` <e0ed44ae-8dae-e8db-9d14-2b09b239af8e@i-love.sakura.ne.jp>
2020-01-13 1:34 ` Christopher Lameter
2019-11-11 18:15 ` [PATCH v4 2/2] mm: avoid slub allocation while holding list_lock Shakeel Butt
2019-09-12 0:29 ` Yu Zhao [this message]
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