From: paulmck@kernel.org
To: rcu@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, kernel-team@fb.com,
mingo@kernel.org, jiangshanlai@gmail.com,
akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org,
rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com,
fweisbec@gmail.com, oleg@redhat.com, joel@joelfernandes.org,
iamjoonsoo.kim@lge.com, andrii@kernel.org,
"Paul E. McKenney" <paulmck@kernel.org>,
linux-mm@kvack.org
Subject: [PATCH v2 sl-b 3/5] mm: Make mem_dump_obj() handle vmalloc() memory
Date: Tue, 8 Dec 2020 17:13:01 -0800 [thread overview]
Message-ID: <20201209011303.32737-3-paulmck@kernel.org> (raw)
In-Reply-To: <20201209011124.GA31164@paulmck-ThinkPad-P72>
From: "Paul E. McKenney" <paulmck@kernel.org>
This commit adds vmalloc() support to mem_dump_obj(). Note that the
vmalloc_dump_obj() function combines the checking and dumping, in
contrast with the split between kmem_valid_obj() and kmem_dump_obj().
The reason for the difference is that the checking in the vmalloc()
case involves acquiring a global lock, and redundant acquisitions of
global locks should be avoided, even on not-so-fast paths.
Note that this change causes on-stack variables to be reported as
vmalloc() storage from kernel_clone() or similar, depending on the degree
of inlining that your compiler does. This is likely more helpful than
the earlier "non-paged (local) memory".
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: <linux-mm@kvack.org>
Reported-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
include/linux/vmalloc.h | 6 ++++++
mm/util.c | 12 +++++++-----
mm/vmalloc.c | 12 ++++++++++++
3 files changed, 25 insertions(+), 5 deletions(-)
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 938eaf9..c89c2be 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -248,4 +248,10 @@ pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
int register_vmap_purge_notifier(struct notifier_block *nb);
int unregister_vmap_purge_notifier(struct notifier_block *nb);
+#ifdef CONFIG_MMU
+bool vmalloc_dump_obj(void *object);
+#else
+static inline bool vmalloc_dump_obj(void *object) { return false; }
+#endif
+
#endif /* _LINUX_VMALLOC_H */
diff --git a/mm/util.c b/mm/util.c
index 8c2449f..ee99a0a 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -984,6 +984,12 @@ int __weak memcmp_pages(struct page *page1, struct page *page2)
*/
void mem_dump_obj(void *object)
{
+ if (kmem_valid_obj(object)) {
+ kmem_dump_obj(object);
+ return;
+ }
+ if (vmalloc_dump_obj(object))
+ return;
if (!virt_addr_valid(object)) {
if (object == NULL)
pr_cont(" NULL pointer.\n");
@@ -993,10 +999,6 @@ void mem_dump_obj(void *object)
pr_cont(" non-paged (local) memory.\n");
return;
}
- if (kmem_valid_obj(object)) {
- kmem_dump_obj(object);
- return;
- }
- pr_cont(" non-slab memory.\n");
+ pr_cont(" non-slab/vmalloc memory.\n");
}
EXPORT_SYMBOL_GPL(mem_dump_obj);
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 6ae491a..7421719 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -3431,6 +3431,18 @@ void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
}
#endif /* CONFIG_SMP */
+bool vmalloc_dump_obj(void *object)
+{
+ struct vm_struct *vm;
+ void *objp = (void *)PAGE_ALIGN((unsigned long)object);
+
+ vm = find_vm_area(objp);
+ if (!vm)
+ return false;
+ pr_cont(" vmalloc allocated at %pS\n", vm->caller);
+ return true;
+}
+
#ifdef CONFIG_PROC_FS
static void *s_start(struct seq_file *m, loff_t *pos)
__acquires(&vmap_purge_lock)
--
2.9.5
next prev parent reply other threads:[~2020-12-09 1:14 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-05 0:40 [PATCH RFC sl-b] Export return addresses for better diagnostics Paul E. McKenney
2020-12-05 0:40 ` [PATCH sl-b 1/6] mm: Add kmem_last_alloc() to return last allocation for memory block paulmck
2020-12-07 9:02 ` Joonsoo Kim
2020-12-07 17:25 ` Paul E. McKenney
2020-12-08 8:57 ` Joonsoo Kim
2020-12-08 15:17 ` Paul E. McKenney
2020-12-05 0:40 ` [PATCH sl-b 2/6] mm: Add kmem_last_alloc_errstring() to provide more kmem_last_alloc() info paulmck
2020-12-05 0:40 ` [PATCH sl-b 3/6] rcu: Make call_rcu() print allocation address of double-freed callback paulmck
2020-12-05 0:40 ` [PATCH sl-b 4/6] mm: Create kmem_last_alloc_stack() to provide stack trace in slub paulmck
2020-12-05 0:40 ` [PATCH sl-b 5/6] percpu_ref: Print allocator upon reference-count underflow paulmck
2020-12-05 0:40 ` [PATCH sl-b 6/6] percpu_ref: Print stack trace " paulmck
2020-12-09 1:11 ` [PATCH RFC v2 sl-b] Export return addresses etc. for better diagnostics Paul E. McKenney
2020-12-09 1:12 ` [PATCH v2 sl-b 1/5] mm: Add mem_dump_obj() to print source of memory block paulmck
2020-12-09 8:17 ` Christoph Hellwig
2020-12-09 14:57 ` Paul E. McKenney
2020-12-09 17:53 ` Christoph Hellwig
2020-12-09 17:59 ` Paul E. McKenney
2020-12-09 17:28 ` Vlastimil Babka
2020-12-09 23:04 ` Paul E. McKenney
2020-12-10 10:48 ` Vlastimil Babka
2020-12-10 19:56 ` Paul E. McKenney
2020-12-10 12:04 ` Joonsoo Kim
2020-12-10 23:41 ` Paul E. McKenney
2020-12-09 1:13 ` [PATCH v2 sl-b 2/5] mm: Make mem_dump_obj() handle NULL and zero-sized pointers paulmck
2020-12-09 17:48 ` Vlastimil Babka
2020-12-10 3:25 ` Paul E. McKenney
2020-12-09 1:13 ` paulmck [this message]
2020-12-09 17:51 ` [PATCH v2 sl-b 3/5] mm: Make mem_dump_obj() handle vmalloc() memory Vlastimil Babka
2020-12-09 19:39 ` Uladzislau Rezki
2020-12-09 23:23 ` Paul E. McKenney
2020-12-10 10:49 ` Vlastimil Babka
2020-12-09 19:36 ` Uladzislau Rezki
2020-12-09 19:42 ` Paul E. McKenney
2020-12-09 20:04 ` Uladzislau Rezki
2020-12-09 1:13 ` [PATCH v2 sl-b 4/5] rcu: Make call_rcu() print mem_dump_obj() info for double-freed callback paulmck
2020-12-09 1:13 ` [PATCH v2 sl-b 5/5] percpu_ref: Dump mem_dump_obj() info upon reference-count underflow paulmck
2020-12-11 1:19 ` [PATCH RFC v2 sl-b] Export return addresses etc. for better diagnostics Paul E. McKenney
2020-12-11 1:19 ` [PATCH v3 sl-b 1/6] mm: Add mem_dump_obj() to print source of memory block paulmck
2020-12-11 2:22 ` Joonsoo Kim
2020-12-11 3:33 ` Paul E. McKenney
2020-12-11 3:42 ` Paul E. McKenney
2020-12-11 6:58 ` Joonsoo Kim
2020-12-11 16:59 ` Paul E. McKenney
2020-12-11 6:54 ` Joonsoo Kim
2020-12-11 1:19 ` [PATCH v3 sl-b 2/6] mm: Make mem_dump_obj() handle NULL and zero-sized pointers paulmck
2020-12-11 1:20 ` [PATCH v3 sl-b 3/6] mm: Make mem_dump_obj() handle vmalloc() memory paulmck
2020-12-11 1:20 ` [PATCH v3 sl-b 4/6] mm: Make mem_obj_dump() vmalloc() dumps include start and length paulmck
2020-12-11 1:20 ` [PATCH v3 sl-b 5/6] rcu: Make call_rcu() print mem_dump_obj() info for double-freed callback paulmck
2020-12-11 1:20 ` [PATCH v3 sl-b 6/6] percpu_ref: Dump mem_dump_obj() info upon reference-count underflow paulmck
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20201209011303.32737-3-paulmck@kernel.org \
--to=paulmck@kernel.org \
--cc=akpm@linux-foundation.org \
--cc=andrii@kernel.org \
--cc=dhowells@redhat.com \
--cc=edumazet@google.com \
--cc=fweisbec@gmail.com \
--cc=iamjoonsoo.kim@lge.com \
--cc=jiangshanlai@gmail.com \
--cc=joel@joelfernandes.org \
--cc=josh@joshtriplett.org \
--cc=kernel-team@fb.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mathieu.desnoyers@efficios.com \
--cc=mingo@kernel.org \
--cc=oleg@redhat.com \
--cc=peterz@infradead.org \
--cc=rcu@vger.kernel.org \
--cc=rostedt@goodmis.org \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).