Commit 3dd98c5c authored by Suren Baghdasaryan's avatar Suren Baghdasaryan Committed by Andrew Morton
Browse files

mm/debug: print vm_refcnt state when dumping the vma 

vm_refcnt encodes a number of useful states:
- whether vma is attached or detached
- the number of current vma readers
- presence of a vma writer
Let's include it in the vma dump.

Link: https://lkml.kernel.org/r/20250213224655.1680278-15-surenb@google.com


Signed-off-by: default avatarSuren Baghdasaryan <surenb@google.com>
Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
Tested-by: default avatarShivank Garg <shivankg@amd.com>
  Link: https://lkml.kernel.org/r/5e19ec93-8307-47c2-bb13-3ddf7150624e@amd.com


Cc: Christian Brauner <brauner@kernel.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jann Horn <jannh@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Klara Modin <klarasmodin@gmail.com>
Cc: Liam R. Howlett <Liam.Howlett@Oracle.com>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Mateusz Guzik <mjguzik@gmail.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Minchan Kim <minchan@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: "Paul E . McKenney" <paulmck@kernel.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Sourav Panda <souravpanda@google.com>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Will Deacon <will@kernel.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 6bef4c2f

mm/debug.c

+6 −0
Original line number Diff line number Diff line
@@ -181,11 +181,17 @@ void dump_vma(const struct vm_area_struct *vma) 
	pr_emerg("vma %px start %px end %px mm %px\n"

		"prot %lx anon_vma %px vm_ops %px\n"

		"pgoff %lx file %px private_data %px\n"

#ifdef CONFIG_PER_VMA_LOCK

		"refcnt %x\n"

#endif

		"flags: %#lx(%pGv)\n",

		vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_mm,

		(unsigned long)pgprot_val(vma->vm_page_prot),

		vma->anon_vma, vma->vm_ops, vma->vm_pgoff,

		vma->vm_file, vma->vm_private_data,

#ifdef CONFIG_PER_VMA_LOCK

		refcount_read(&vma->vm_refcnt),

#endif

		vma->vm_flags, &vma->vm_flags);

}

EXPORT_SYMBOL(dump_vma);