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=-2.5 required=3.0 tests=MAILING_LIST_MULTI,SPF_PASS, USER_AGENT_MUTT autolearn=ham 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 9A286C43441 for ; Mon, 19 Nov 2018 06:28:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6BBAA2086A for ; Mon, 19 Nov 2018 06:28:46 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6BBAA2086A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726206AbeKSQvX (ORCPT ); Mon, 19 Nov 2018 11:51:23 -0500 Received: from lgeamrelo11.lge.com ([156.147.23.51]:42567 "EHLO lgeamrelo11.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725908AbeKSQvX (ORCPT ); Mon, 19 Nov 2018 11:51:23 -0500 Received: from unknown (HELO lgeamrelo02.lge.com) (156.147.1.126) by 156.147.23.51 with ESMTP; 19 Nov 2018 15:28:42 +0900 X-Original-SENDERIP: 156.147.1.126 X-Original-MAILFROM: namhyung@kernel.org Received: from unknown (HELO sejong) (10.177.227.17) by 156.147.1.126 with ESMTP; 19 Nov 2018 15:28:42 +0900 X-Original-SENDERIP: 10.177.227.17 X-Original-MAILFROM: namhyung@kernel.org Date: Mon, 19 Nov 2018 15:28:37 +0900 From: Namhyung Kim To: David Miller Cc: jolsa@redhat.com, acme@kernel.org, linux-kernel@vger.kernel.org, jolsa@kernel.org, kernel-team@lge.com Subject: Re: [PATCH RFC] hist lookups Message-ID: <20181119062837.GB20153@sejong> References: <20181111232627.GC30042@krava> <20181111.153259.2003083478035551655.davem@davemloft.net> <20181113104054.GJ30042@krava> <20181118.205243.227550158553460819.davem@davemloft.net> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20181118.205243.227550158553460819.davem@davemloft.net> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello David, On Sun, Nov 18, 2018 at 08:52:43PM -0800, David Miller wrote: > From: Jiri Olsa > Date: Tue, 13 Nov 2018 11:40:54 +0100 > > > I pushed/rebased what I have to perf/fixes branch again > > > > please note I had to change our compile changes, because > > they wouldn't compile on x86, but I can't verify on sparc, > > so you might see some compile fails again > > I just checked your current perf/fixes branch. > > It builds on Sparc ;-) > > And it behaves better too. I do get tons of drops and lost events, > but it seems to keep going even during the hardest load. > > Eventually I end up with a lot of unresolvable histogram entries, > so that is something to look into. Did you record callchains as well? I'd like to know whether it's related to the children (cumulative) mode or not. Thanks, Namhyung > > I looked at your drop logic and it seems perfect, we avoid dropping > all non-SAMPLE events which is what we want. So that can't be the > cause of the issues I am seeing. >