Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752340AbbHSPq4 (ORCPT ); Wed, 19 Aug 2015 11:46:56 -0400 Received: from mx2.suse.de ([195.135.220.15]:52924 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751437AbbHSPqy (ORCPT ); Wed, 19 Aug 2015 11:46:54 -0400 Date: Wed, 19 Aug 2015 17:47:00 +0200 From: Borislav Petkov To: Jiri Olsa Cc: Andy Lutomirski , "linux-kernel@vger.kernel.org" , X86 ML , Peter Zijlstra , Ingo Molnar , Robert Richter , "H. Peter Anvin" , Thomas Gleixner , Arnaldo Carvalho de Melo , Namhyung Kim , Jan Stancek , Suravee Suthikulpanit , Sherry Hurwitz Subject: Re: [BUG/RFC] perf test fails on AMD CPUs Message-ID: <20150819154700.GA19622@nazgul.tnic> References: <20150816222956.GA14290@krava.brq.redhat.com> <20150817043603.GB9387@nazgul.tnic> <20150818101025.GA15340@krava.brq.redhat.com> <20150819035519.GA31385@nazgul.tnic> <20150819085546.GA5883@krava.local> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20150819085546.GA5883@krava.local> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3334 Lines: 60 On Wed, Aug 19, 2015 at 10:55:46AM +0200, Jiri Olsa wrote: > this is the perf breakpoint address: > 000000000045b260 : > > this is trace_printk output for NEW microcode 0x6000832: > > DEBUG EX > perf-893 [003] d... 1358.053633: sync_regs: sync_regs eregs ffff88012ecc7f58, regs ffff8800c9f1bf58 > perf-893 [003] d... 1358.053635: do_debug: do_debug-1 regs ffff8800c9f1bf58, eflags 217, rip 45b260 > perf-893 [003] d.h. 1358.053641: do_debug: do_debug-2 eflags 10217, rip 45b260 > perf-893 [003] d... 1358.053642: prepare_exit_to_usermode: prepare_exit_to_usermode1 regs ffff8800c9f1bf58, eflags 10217, rip 45b260 > perf-893 [003] d... 1358.053643: prepare_exit_to_usermode: prepare_exit_to_usermode3 regs ffff8800c9f1bf58, eflags 10217, rip 45b260 Yikes! Something cleared EFLAGS.RF here. And the same thing doesn't happen with the older ucode version. Are you sure nothing happens in-between prepare_exit_to_usermode() and smp_irq_work_interrupt()? It looks like nothing does because the timestamps are really close. > WORK_IRQ > ---> perf-893 [003] d... 1358.053645: smp_irq_work_interrupt: smp_irq_work_interrupt1 regs ffff8800c9f1bf58, eflags 217, rip 45b260 > perf-893 [003] d.h. 1358.053650: perf_event_wakeup: irq_work SIGIO > perf-893 [003] d... 1358.053651: smp_irq_work_interrupt: smp_irq_work_interrupt2 regs ffff8800c9f1bf58, eflags 217, rip 45b260 > > perf-893 [003] d... 1358.053652: prepare_exit_to_usermode: prepare_exit_to_usermode1 regs ffff8800c9f1bf58, eflags 217, rip 45b260 > > > this is trace_printk output for OLD microcode 0x6000822: > > DEBUG EX > perf-898 [005] d... 87.098816: sync_regs: sync_regs eregs ffff88012ed47f58, regs ffff8800c9c8ff58 > perf-898 [005] d... 87.098817: do_debug: do_debug-1 regs ffff8800c9c8ff58, eflags 217, rip 45b260 > perf-898 [005] d.h. 87.098823: do_debug: do_debug-2 eflags 10217, rip 45b260 > perf-898 [005] d... 87.098824: prepare_exit_to_usermode: prepare_exit_to_usermode1 regs ffff8800c9c8ff58, eflags 10217, rip 45b260 > perf-898 [005] d... 87.098825: prepare_exit_to_usermode: prepare_exit_to_usermode3 regs ffff8800c9c8ff58, eflags 10217, rip 45b260 > > WORK_IRQ > ---> perf-898 [005] d... 87.098827: smp_irq_work_interrupt: smp_irq_work_interrupt1 regs ffff8800c9c8ff58, eflags 10217, rip 45b260 > perf-898 [005] d.h. 87.098832: perf_event_wakeup: irq_work SIGIO > perf-898 [005] d... 87.098833: smp_irq_work_interrupt: smp_irq_work_interrupt2 regs ffff8800c9c8ff58, eflags 10217, rip 45b260 > > perf-898 [005] d... 87.098833: prepare_exit_to_usermode: prepare_exit_to_usermode1 regs ffff8800c9c8ff58, eflags 10217, rip 45b260 Thanks. -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply. SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/