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authorPaul E. McKenney <paulmck@kernel.org>2020-12-08 16:13:57 -0800
committerPaul E. McKenney <paulmck@kernel.org>2021-01-22 15:24:04 -0800
commit98f180837a896ecedf8f7e12af22b57f271d43c9 (patch)
tree68aa15a82f5e689a5c057edb6d6ab5808ea8a66f /mm
parentb70fa3b12fc8d2b870d1ac7fd44da89271eb8705 (diff)
mm: Make mem_dump_obj() handle vmalloc() memory
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> Acked-by: Vlastimil Babka <vbabka@suse.cz> Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/util.c14
-rw-r--r--mm/vmalloc.c12
2 files changed, 20 insertions, 6 deletions
diff --git a/mm/util.c b/mm/util.c
index 92f23d2c1277..54870226cea6 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -996,18 +996,20 @@ 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");
else if (object == ZERO_SIZE_PTR)
pr_cont(" zero-size pointer.\n");
else
- pr_cont(" non-paged (local) memory.\n");
- return;
- }
- if (kmem_valid_obj(object)) {
- kmem_dump_obj(object);
+ pr_cont(" non-paged memory.\n");
return;
}
- pr_cont(" non-slab memory.\n");
+ pr_cont(" non-slab/vmalloc memory.\n");
}
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 4d88fe5a277a..c274ea4f14ea 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -3448,6 +3448,18 @@ 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)