From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751255AbcHRFf1 (ORCPT ); Thu, 18 Aug 2016 01:35:27 -0400 Received: from mail-pf0-f194.google.com ([209.85.192.194]:34258 "EHLO mail-pf0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750720AbcHRFf0 (ORCPT ); Thu, 18 Aug 2016 01:35:26 -0400 Date: Thu, 18 Aug 2016 01:33:45 -0400 From: Janani Ravichandran To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: riel@surriel.com, akpm@linux-foundation.org, vdavydov@virtuozzo.com, mhocko@suse.com, vbabka@suse.cz, mgorman@techsingularity.net, kirill.shutemov@linux.intel.com, bywxiaobai@163.com Subject: [PATCH v2 0/2] Get callbacks/names of shrinkers from tracepoints Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently, it is not possible to know which shrinkers are being run. Even though the callbacks are printed using %pF in tracepoints mm_shrink_slab_start and mm_shrink_slab_end, they are not visible to userspace tools like perf. To address this, this patchset 1. Enables the display of names of shrinker callbacks in tracepoints mm_shrink_slab_start and mm_shrink_slab_end. 2. Adds a new tracepoint in the callback of the superblock shrinker to get specific names of superblock types. Changes since v1 at https://lkml.org/lkml/2016/7/9/33: 1. This patchset does not introduce a new variable to hold names of shrinkers, unlike v1. It makes mm_shrink_slab_start and mm_shrink_slab_end print names of callbacks instead. 2. It also adds a new tracepoint for superblock shrinkers to display more specific name information, which v1 did not do. Thanks to Dave Chinner and Tony Jones for their suggestions. Janani Ravichandran (2): include: trace: Display names of shrinker callbacks fs: super.c: Add tracepoint to get name of superblock shrinker fs/super.c | 2 ++ include/trace/events/vmscan.h | 39 +++++++++++++++++++++++++++++++++++++-- 2 files changed, 39 insertions(+), 2 deletions(-) -- 2.7.0