Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751359AbdH3Hde (ORCPT ); Wed, 30 Aug 2017 03:33:34 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:50540 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751309AbdH3Hdc (ORCPT ); Wed, 30 Aug 2017 03:33:32 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org EFCC260725 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=guptap@codeaurora.org From: Prakash Gupta To: akpm@linux-foundation.org, mhocko@suse.com, vbabka@suse.cz, will.deacon@arm.com, catalin.marinas@arm.com, iamjoonsoo.kim@lge.com, rmk+kernel@arm.linux.org.uk, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Prakash Gupta Subject: [PATCH 2/2] mm, page_owner: Skip unnecessary stack_trace entries Date: Wed, 30 Aug 2017 13:02:23 +0530 Message-Id: <1504078343-28754-2-git-send-email-guptap@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1504078343-28754-1-git-send-email-guptap@codeaurora.org> References: <1504078343-28754-1-git-send-email-guptap@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1483 Lines: 42 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 Fixes: f2ca0b557107 ("mm/page_owner: use stackdepot to store stacktrace") 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 10d16fc45bd9..75b7c39bf1df 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -139,7 +139,7 @@ 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; -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by The Linux Foundation