On 1/6/21 2:17 AM, paulmck@xxxxxxxxxx wrote: > From: "Paul E. McKenney" <paulmck@xxxxxxxxxx> > > 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@xxxxxxxxxxxxxxxxxxxx> > Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> > Cc: <linux-mm@xxxxxxxxx> > Reported-by: Andrii Nakryiko <andrii@xxxxxxxxxx> > Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx> Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
