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Message-Id: <20230803101754.1149-1-thunder.leizhen@huaweicloud.com>
Date: Thu, 3 Aug 2023 18:17:51 +0800
From: thunder.leizhen@...weicloud.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>,
Vlastimil Babka <vbabka@...e.cz>,
Roman Gushchin <roman.gushchin@...ux.dev>,
Hyeonggon Yoo <42.hyeyoo@...il.com>, linux-mm@...ck.org,
"Paul E . McKenney" <paulmck@...nel.org>,
Frederic Weisbecker <frederic@...nel.org>,
Neeraj Upadhyay <quic_neeraju@...cinc.com>,
Joel Fernandes <joel@...lfernandes.org>,
Josh Triplett <josh@...htriplett.org>,
Boqun Feng <boqun.feng@...il.com>,
Steven Rostedt <rostedt@...dmis.org>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Lai Jiangshan <jiangshanlai@...il.com>,
Zqiang <qiang.zhang1211@...il.com>, rcu@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: Zhen Lei <thunder.leizhen@...wei.com>
Subject: [PATCH v5 0/3] rcu: Dump memory object info if callback function is invalid
From: Zhen Lei <thunder.leizhen@...wei.com>
v4 --> v5:
1. Add Reviewed-by Acked-by for patch 1/3
2. Add patch 3/3:
mm: Dump the memory of slab object in kmem_dump_obj()
v3 --> v4:
1. Remove kmem_valid_obj() and convert kmem_dump_obj() to work the same way
as vmalloc_dump_obj().
2. In kernel/rcu/rcu.h
-#include <linux/mm.h>
+#include <linux/slab.h>
v2 --> v3:
1. I made statistics about the source of 'rhp'. kmem_valid_obj() accounts for
more than 97.5%, and vmalloc accounts for less than 1%. So change call
mem_dump_obj() to call kmem_dump_obj() can meet debugging requirements and
avoid the potential deadlock risk of vmalloc_dump_obj().
- mem_dump_obj(rhp);
+ if (kmem_valid_obj(rhp))
+ kmem_dump_obj(rhp);
The discussion about vmap_area_lock deadlock in v2:
https://lkml.org/lkml/2022/11/11/493
2. Provide static inline empty functions for kmem_valid_obj() and kmem_dump_obj()
when CONFIG_PRINTK=n.
v1 --> v2:
1. Remove condition "(unsigned long)rhp->func & 0x3", it have problems on x86.
2. Paul E. McKenney helped me update the commit message, thanks.
Zhen Lei (3):
mm: Remove kmem_valid_obj()
rcu: Dump memory object info if callback function is invalid
mm: Dump the memory of slab object in kmem_dump_obj()
include/linux/slab.h | 5 +--
kernel/rcu/rcu.h | 7 +++++
kernel/rcu/srcutiny.c | 1 +
kernel/rcu/srcutree.c | 1 +
kernel/rcu/tasks.h | 1 +
kernel/rcu/tiny.c | 1 +
kernel/rcu/tree.c | 1 +
mm/slab_common.c | 71 +++++++++++++++++++++++--------------------
mm/util.c | 4 +--
9 files changed, 54 insertions(+), 38 deletions(-)
--
2.34.1
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