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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS 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 8D349C43441 for ; Mon, 19 Nov 2018 06:34:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 50EFD2086A for ; Mon, 19 Nov 2018 06:34:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 50EFD2086A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=davemloft.net 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 S1726179AbeKSQ4i (ORCPT ); Mon, 19 Nov 2018 11:56:38 -0500 Received: from shards.monkeyblade.net ([23.128.96.9]:34604 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726023AbeKSQ4h (ORCPT ); Mon, 19 Nov 2018 11:56:37 -0500 Received: from localhost (unknown [IPv6:2601:601:9f80:35cd::bf5]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) (Authenticated sender: davem-davemloft) by shards.monkeyblade.net (Postfix) with ESMTPSA id CF402148E32F8; Sun, 18 Nov 2018 22:33:57 -0800 (PST) Date: Sun, 18 Nov 2018 22:33:55 -0800 (PST) Message-Id: <20181118.223355.244349385967273824.davem@davemloft.net> To: namhyung@kernel.org 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 From: David Miller In-Reply-To: <20181119062837.GB20153@sejong> References: <20181113104054.GJ30042@krava> <20181118.205243.227550158553460819.davem@davemloft.net> <20181119062837.GB20153@sejong> X-Mailer: Mew version 6.8 on Emacs 26.1 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Sun, 18 Nov 2018 22:33:58 -0800 (PST) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Namhyung Kim Date: Mon, 19 Nov 2018 15:28:37 +0900 > 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. I did not have callchains on, just plain "./perf top"