From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f43.google.com (mail-pa0-f43.google.com [209.85.220.43]) by kanga.kvack.org (Postfix) with ESMTP id E38176B0038 for ; Tue, 1 Dec 2015 18:26:00 -0500 (EST) Received: by pabfh17 with SMTP id fh17so20539910pab.0 for ; Tue, 01 Dec 2015 15:26:00 -0800 (PST) Received: from mail-pa0-x233.google.com (mail-pa0-x233.google.com. [2607:f8b0:400e:c03::233]) by mx.google.com with ESMTPS id d10si185283pap.237.2015.12.01.15.26.00 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 01 Dec 2015 15:26:00 -0800 (PST) Received: by pacej9 with SMTP id ej9so19928796pac.2 for ; Tue, 01 Dec 2015 15:26:00 -0800 (PST) From: Yang Shi Subject: [RFC] Add gup trace points support Date: Tue, 1 Dec 2015 15:06:10 -0800 Message-Id: <1449011177-30686-1-git-send-email-yang.shi@linaro.org> Sender: owner-linux-mm@kvack.org List-ID: To: akpm@linux-foundation.org, rostedt@goodmis.org, mingo@redhat.com Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linaro-kernel@lists.linaro.org, yang.shi@linaro.org Some background about why I think this might be useful. When I was profiling some hugetlb related program, I got page-faults event doubled when hugetlb is enabled. When I looked into the code, I found page-faults come from two places, do_page_fault and gup. So, I tried to figure out which play a role (or both) in my use case. But I can't find existing finer tracing event for sub page-faults in current mainline kernel. So, I added the gup trace points support to have finer tracing events for page-faults. The below events are added: __get_user_pages __get_user_pages_fast fixup_user_fault Both __get_user_pages and fixup_user_fault call handle_mm_fault. Just added trace points to raw version __get_user_pages since all variants will call it finally to do real work. Although __get_user_pages_fast doesn't call handle_mm_fault, it might be useful to have it to distinguish between slow and fast version. Yang Shi (7): trace/events: Add gup trace events mm/gup: add gup trace points x86: mm/gup: add gup trace points mips: mm/gup: add gup trace points s390: mm/gup: add gup trace points sh: mm/gup: add gup trace points sparc64: mm/gup: add gup trace points arch/mips/mm/gup.c | 7 +++++++ arch/s390/mm/gup.c | 7 +++++++ arch/sh/mm/gup.c | 8 ++++++++ arch/sparc/mm/gup.c | 8 ++++++++ arch/x86/mm/gup.c | 7 +++++++ include/trace/events/gup.h | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ mm/gup.c | 8 ++++++++ 7 files changed, 122 insertions(+) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org