From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_2 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A367DC433E0 for ; Thu, 30 Jul 2020 14:01:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8BB4320829 for ; Thu, 30 Jul 2020 14:01:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728403AbgG3OB3 convert rfc822-to-8bit (ORCPT ); Thu, 30 Jul 2020 10:01:29 -0400 Received: from mail.kernel.org ([198.145.29.99]:37810 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726275AbgG3OB3 (ORCPT ); Thu, 30 Jul 2020 10:01:29 -0400 Received: from oasis.local.home (cpe-66-24-58-225.stny.res.rr.com [66.24.58.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3A1FA20838; Thu, 30 Jul 2020 14:01:28 +0000 (UTC) Date: Thu, 30 Jul 2020 10:01:26 -0400 From: Steven Rostedt To: Zhaoyang Huang Cc: Ingo Molnar , chunyan.zhang@unisoc.com, Zhaoyang Huang , linux-kernel@vger.kernel.org Subject: Re: [PATCH] trace : use kvmalloc instead of kmalloc Message-ID: <20200730100126.410b3fb1@oasis.local.home> In-Reply-To: <1596107052-25682-1-git-send-email-zhaoyang.huang@unisoc.com> References: <1596107052-25682-1-git-send-email-zhaoyang.huang@unisoc.com> X-Mailer: Claws Mail 3.17.3 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is also the second version of the patch. Please add a v2 to the subject, otherwise it gets confusing to know which one to pull in. "[PATCH v2] ..." -- Steve On Thu, 30 Jul 2020 19:04:12 +0800 Zhaoyang Huang wrote: > High order memory stuff within trace could introduce OOM, use kvmalloc instead. > > Please find the bellowing for the call stack we run across in an android system. The scenario happens when traced_probes is woken up to get a large quantity of trace even if free memory is even higher than watermark_low.  >