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=-3.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_NEOMUTT autolearn=unavailable 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 9002DC28EB9 for ; Thu, 6 Jun 2019 23:58:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 61E082083E for ; Thu, 6 Jun 2019 23:58:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728098AbfFFX6b (ORCPT ); Thu, 6 Jun 2019 19:58:31 -0400 Received: from mx1.redhat.com ([209.132.183.28]:50820 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726870AbfFFX6b (ORCPT ); Thu, 6 Jun 2019 19:58:31 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 13495307D864; Thu, 6 Jun 2019 23:58:31 +0000 (UTC) Received: from treble (ovpn-120-211.rdu2.redhat.com [10.10.120.211]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 0AB627842C; Thu, 6 Jun 2019 23:58:29 +0000 (UTC) Date: Thu, 6 Jun 2019 19:58:26 -0400 From: Josh Poimboeuf To: Song Liu Cc: Kairui Song , Alexei Starovoitov , Peter Zijlstra , lkml , Kernel Team , Alexei Starovoitov , Daniel Borkmann , "bpf@vger.kernel.org" Subject: Re: Getting empty callchain from perf_callchain_kernel() Message-ID: <20190606235826.ryudsd37bcjolbb2@treble> References: <20190523133253.tad6ywzzexks6hrp@treble> <20190523152413.m2pbnamihu3s2c5s@treble> <20190523172714.6fkzknfsuv2t44se@treble> <20190524232312.upjixcrnidlibikd@treble> <145B7F65-2E06-4266-A816-A3445FE47638@fb.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <145B7F65-2E06-4266-A816-A3445FE47638@fb.com> User-Agent: NeoMutt/20180716 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.48]); Thu, 06 Jun 2019 23:58:31 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jun 06, 2019 at 04:04:48PM +0000, Song Liu wrote: > >> Here's a tentative BPF fix for the JIT frame pointer issue. It was a > >> bit harder than I expected. Encoding r12 as a base register requires a > >> SIB byte, so I had to add support for encoding that. I also simplified > >> the prologue to resemble a GCC prologue, which decreases the prologue > >> size quite a bit. > >> > >> Next week I can work on the corresponding ORC change. Then I can clean > >> all the patches up and submit them properly. > > Hi Josh, > > Have you got luck fixing the ORC side? Sorry, I've been traveling this week and I haven't had a chance to work on it. It's at the top of my TODO list for next week. -- Josh