From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753501AbdKXJqs (ORCPT ); Fri, 24 Nov 2017 04:46:48 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:60022 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753468AbdKXJqp (ORCPT ); Fri, 24 Nov 2017 04:46:45 -0500 From: Thomas Richter To: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, acme@kernel.org Cc: brueckner@linux.vnet.ibm.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, Thomas Richter Subject: [PATCH] perf annotate: Fix unnecessary memory allocation for s390x Date: Fri, 24 Nov 2017 10:46:37 +0100 X-Mailer: git-send-email 2.13.5 X-TM-AS-GCONF: 00 x-cbid: 17112409-0040-0000-0000-000004122461 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17112409-0041-0000-0000-000020B4F88E Message-Id: <20171124094637.55558-1-tmricht@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-11-24_03:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1711240132 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch fixes a bug introduced with commit d9f8dfa9baf9 ("perf annotate s390: Implement jump types for perf annotate"). Perf annotate displays annotated assembler output by reading output of command objdump and parsing the disassembled lines. For each shown mnemonic this function sequence is executed: disasm_line__new() | +--> disasm_line__init_ins() | +--> ins__find() | +--> arch->associate_instruction_ops() The s390x specific function assigned to function pointer associate_instruction_ops refers to function s390__associate_ins_ops(). This function checks for supported mnemonics and assigns a NULL pointer to unsupported mnemonics. However even the NULL pointer is added to the architecture dependend instruction array. This leads to an extremely large architecture instruction array (due to array resize logic in function arch__grow_instructions()). Depending on the objdump output being parsed the array can end up with several ten-thousand elements. This patch checks if a mnemonic is supported and only adds supported ones into the architecture instruction array. The array does not contain elements with NULL pointers anymore. Before the patch (With some debug printf output): [root@s35lp76 perf]# time ./perf annotate --stdio > /tmp/xxxbb real 8m49.679s user 7m13.008s sys 0m1.649s [root@s35lp76 perf]# fgrep '__ins__find sorted:1 nr_instructions:' /tmp/xxxbb | tail -1 __ins__find sorted:1 nr_instructions:87433 ins:0x341583c0 [root@s35lp76 perf]# The number of different s390x branch/jump/call/return instructions entered into the array is 87433. After the patch (With some printf debug output:) [root@s35lp76 perf]# time ./perf annotate --stdio > /tmp/xxxaa real 1m24.553s user 0m0.587s sys 0m1.530s [root@s35lp76 perf]# fgrep '__ins__find sorted:1 nr_instructions:' /tmp/xxxaa | tail -1 __ins__find sorted:1 nr_instructions:56 ins:0x3f406570 [root@s35lp76 perf]# The number of different s390x branch/jump/call/return instructions entered into the array is 56 which is sensible. Signed-off-by: Thomas Richter Reviewed-by: Hendrik Brueckner --- tools/perf/arch/s390/annotate/instructions.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tools/perf/arch/s390/annotate/instructions.c b/tools/perf/arch/s390/annotate/instructions.c index c9a81673e8aa..89f0b6c00e3f 100644 --- a/tools/perf/arch/s390/annotate/instructions.c +++ b/tools/perf/arch/s390/annotate/instructions.c @@ -16,7 +16,8 @@ static struct ins_ops *s390__associate_ins_ops(struct arch *arch, const char *na if (!strcmp(name, "br")) ops = &ret_ops; - arch__associate_ins_ops(arch, name, ops); + if (ops) + arch__associate_ins_ops(arch, name, ops); return ops; } -- 2.13.4