From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755349Ab3DWFne (ORCPT ); Tue, 23 Apr 2013 01:43:34 -0400 Received: from e28smtp01.in.ibm.com ([122.248.162.1]:52294 "EHLO e28smtp01.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754884Ab3DWFnL (ORCPT ); Tue, 23 Apr 2013 01:43:11 -0400 From: Anshuman Khandual To: linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org Cc: michael@ellerman.id.au, mikey@neuling.org Subject: [PATCH V4 0/5] powerpc, perf: BHRB based branch stack enablement on POWER8 Date: Tue, 23 Apr 2013 11:12:39 +0530 Message-Id: <1366695764-3073-1-git-send-email-khandual@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.11.7 X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13042305-4790-0000-0000-000007F92548 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Branch History Rolling Buffer (BHRB) is a new PMU feaure in IBM POWER8 processor which records the branch instructions inside the execution pipeline. This patchset enables the basic functionality of the feature through generic perf branch stack sampling framework. Sample output ------------- $./perf record -b top $./perf report Overhead Command Source Shared Object Source Symbol Target Shared Object Target Symbol # ........ ....... .................... ...................................... .................... ................................... # 7.82% top libc-2.11.2.so [k] _IO_vfscanf libc-2.11.2.so [k] _IO_vfscanf 6.17% top libc-2.11.2.so [k] _IO_vfscanf [unknown] [k] 00000000 2.37% top [unknown] [k] 0xf7aafb30 [unknown] [k] 00000000 1.80% top [unknown] [k] 0x0fe07978 libc-2.11.2.so [k] _IO_vfscanf 1.60% top libc-2.11.2.so [k] _IO_vfscanf [kernel.kallsyms] [k] .do_task_stat 1.20% top [kernel.kallsyms] [k] .do_task_stat [kernel.kallsyms] [k] .do_task_stat 1.02% top libc-2.11.2.so [k] vfprintf libc-2.11.2.so [k] vfprintf 0.92% top top [k] _init [unknown] [k] 0x0fe037f4 Changes in V2 -------------- - Added copyright messages to the newly created files - Modified couple of commit messages Changes in V3 ------------- - Incorporated review comments from Segher https://lkml.org/lkml/2013/4/16/350 - Worked on a solution for review comment from Michael Ellerman https://lkml.org/lkml/2013/4/17/548 - Could not move updated cpu_hw_events structure from core-book3s.c file into perf_event_server.h Because perf_event_server.h is pulled in first inside linux/perf_event.h before the definition of perf_branch_entry structure. Thats the reason why perf_branch_entry definition is not available inside perf_event_server.h where we define the array inside cpu_hw_events structure. - Finally have pulled in the code from perf_event_bhrb.c into core-book3s.c - Improved documentation for the patchset Changes in V4 ------------- - Incorporated review comments on V3 regarding new instruction encoding Anshuman Khandual (5): powerpc, perf: Add new BHRB related instructions for POWER8 powerpc, perf: Add basic assembly code to read BHRB entries on POWER8 powerpc, perf: Add new BHRB related generic functions, data and flags powerpc, perf: Define BHRB generic functions, data and flags for POWER8 powerpc, perf: Enable branch stack sampling framework arch/powerpc/include/asm/perf_event_server.h | 7 ++ arch/powerpc/include/asm/ppc-opcode.h | 8 ++ arch/powerpc/perf/Makefile | 2 +- arch/powerpc/perf/bhrb.S | 44 +++++++ arch/powerpc/perf/core-book3s.c | 167 ++++++++++++++++++++++++++- arch/powerpc/perf/power8-pmu.c | 57 ++++++++- 6 files changed, 280 insertions(+), 5 deletions(-) create mode 100644 arch/powerpc/perf/bhrb.S -- 1.7.11.7