From bf6d3e63f9fae49b40596ce91549ec45d1f62522 Mon Sep 17 00:00:00 2001 From: Prakash Gupta Date: Thu, 7 Sep 2017 10:25:35 +1000 Subject: mm, page_owner: skip unnecessary stack_trace entries The page_owner stacktrace always begin as follows: [] save_stack+0x40/0xc8 [] __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 f2ca0b557107 ("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) [] post_alloc_hook+0x70/0x80 ... [] msm_comm_try_state+0x5f8/0x14f4 [] msm_vidc_open+0x5e4/0x7d0 [] msm_v4l2_open+0xa8/0x224 Change-Id: Ia34fc127d691c2858d991bb631aad9ebc703bcee Link: http://lkml.kernel.org/r/1504078343-28754-2-git-send-email-guptap@codeaurora.org Fixes: f2ca0b557107 ("mm/page_owner: use stackdepot to store stacktrace") Acked-by: Vlastimil Babka Cc: Catalin Marinas Cc: Joonsoo Kim Cc: Michal Hocko Cc: Russell King Cc: Will Deacon Signed-off-by: Andrew Morton Signed-off-by: Stephen Rothwell Git-commit: 665bb76dd71bc061c5f730226dc1881d151983c8 Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git Signed-off-by: Prakash Gupta --- mm/page_owner.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/page_owner.c b/mm/page_owner.c index 3a9a358e7c63..10b7f196b005 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -129,7 +129,7 @@ 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; -- cgit v1.2.3