Commit 5f48f0bd authored by Prakash Gupta's avatar Prakash Gupta Committed by Linus Torvalds

mm, page_owner: skip unnecessary stack_trace entries

The page_owner stacktrace always begin as follows:

  [<ffffff987bfd48f4>] save_stack+0x40/0xc8
  [<ffffff987bfd4da8>] __set_page_owner+0x3c/0x6c

These two entries do not provide any useful information and limits the
available stacktrace depth.  The page_owner stacktrace was skipping
caller function from stack entries but this was missed with commit
f2ca0b55 ("mm/page_owner: use stackdepot to store stacktrace")

Example page_owner entry after the patch:

  Page allocated via order 0, mask 0x8(ffffff80085fb714)
  PFN 654411 type Movable Block 639 type CMA Flags 0x0(ffffffbe5c7f12c0)
  [<ffffff9b64989c14>] post_alloc_hook+0x70/0x80
  [<ffffff9b651216e8>] msm_comm_try_state+0x5f8/0x14f4
  [<ffffff9b6512486c>] msm_vidc_open+0x5e4/0x7d0
  [<ffffff9b65113674>] msm_v4l2_open+0xa8/0x224

Fixes: f2ca0b55 ("mm/page_owner: use stackdepot to store stacktrace")
Signed-off-by: default avatarPrakash Gupta <>
Acked-by: default avatarVlastimil Babka <>
Cc: Catalin Marinas <>
Cc: Joonsoo Kim <>
Cc: Michal Hocko <>
Cc: Russell King <>
Cc: Will Deacon <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent bb53c820
......@@ -142,7 +142,7 @@ static noinline depot_stack_handle_t save_stack(gfp_t flags)
.nr_entries = 0,
.entries = entries,
.max_entries = PAGE_OWNER_STACK_DEPTH,
.skip = 0
.skip = 2
depot_stack_handle_t handle;
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