From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Morton Subject: [patch 119/131] tools/vm/page_owner_sort.c: filter out unneeded line Date: Wed, 03 Jun 2020 16:03:22 -0700 Message-ID: <20200603230322.JNHaLaumS%akpm@linux-foundation.org> References: <20200603155549.e041363450869eaae4c7f05b@linux-foundation.org> Reply-To: linux-kernel@vger.kernel.org Return-path: Received: from mail.kernel.org ([198.145.29.99]:47834 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726531AbgFCXIj (ORCPT ); Wed, 3 Jun 2020 19:08:39 -0400 In-Reply-To: <20200603155549.e041363450869eaae4c7f05b@linux-foundation.org> Sender: mm-commits-owner@vger.kernel.org List-Id: mm-commits@vger.kernel.org To: akpm@linux-foundation.org, ch0.han@lge.com, corbet@lwn.net, iamjoonsoo.kim@lge.com, linux-mm@kvack.org, mm-commits@vger.kernel.org, torvalds@linux-foundation.org, vbabka@suse.cz From: Changhee Han Subject: tools/vm/page_owner_sort.c: filter out unneeded line To see a sorted result from page_owner, there must be a tiresome preprocessing step before running page_owner_sort. This patch simply filters out lines which start with "PFN" while reading the page owner report. Link: http://lkml.kernel.org/r/20200429052940.16968-1-ch0.han@lge.com Signed-off-by: Changhee Han Reviewed-by: Andrew Morton Cc: Vlastimil Babka Cc: Joonsoo Kim Cc: Jonathan Corbet Signed-off-by: Andrew Morton --- Documentation/vm/page_owner.rst | 3 +-- tools/vm/page_owner_sort.c | 5 +++-- 2 files changed, 4 insertions(+), 4 deletions(-) --- a/Documentation/vm/page_owner.rst~tools-vm-page_owner_sort-filter-out-unneeded-line +++ a/Documentation/vm/page_owner.rst @@ -83,8 +83,7 @@ Usage 4) Analyze information from page owner:: cat /sys/kernel/debug/page_owner > page_owner_full.txt - grep -v ^PFN page_owner_full.txt > page_owner.txt - ./page_owner_sort page_owner.txt sorted_page_owner.txt + ./page_owner_sort page_owner_full.txt sorted_page_owner.txt See the result about who allocated each page in the ``sorted_page_owner.txt``. --- a/tools/vm/page_owner_sort.c~tools-vm-page_owner_sort-filter-out-unneeded-line +++ a/tools/vm/page_owner_sort.c @@ -4,8 +4,7 @@ * * Example use: * cat /sys/kernel/debug/page_owner > page_owner_full.txt - * grep -v ^PFN page_owner_full.txt > page_owner.txt - * ./page_owner_sort page_owner.txt sorted_page_owner.txt + * ./page_owner_sort page_owner_full.txt sorted_page_owner.txt * * See Documentation/vm/page_owner.rst */ @@ -38,6 +37,8 @@ int read_block(char *buf, int buf_size, while (buf_end - curr > 1 && fgets(curr, buf_end - curr, fin)) { if (*curr == '\n') /* empty line */ return curr - buf; + if (!strncmp(curr, "PFN", 3)) + continue; curr += strlen(curr); } _