From patchwork Mon Oct 17 10:18:28 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nico Boehr X-Patchwork-Id: 13008509 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C793DC43219 for ; Mon, 17 Oct 2022 10:20:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229950AbiJQKTb (ORCPT ); Mon, 17 Oct 2022 06:19:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57288 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231136AbiJQKSv (ORCPT ); Mon, 17 Oct 2022 06:18:51 -0400 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2FACC5FAD9 for ; Mon, 17 Oct 2022 03:18:36 -0700 (PDT) Received: from pps.filterd (m0098421.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 29H8wtMh016722 for ; Mon, 17 Oct 2022 10:18:35 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=NCj+g+QMbgRsdrN2fFUPawpH07x7tDlX4VA+xAXKU1U=; b=ekoS3OoyrSKu+w9qSo1Qu+QVN+WkIzSHHgWKwi7yoD5pG4OjwQV0rz6uZq7y9D0c1I6V y1rfJMgMKfxoFZyOkP6mWMaHb7rkptr2sn9INZzTnYysJKVytIvOCqIL03bbjPlOtvxH Zk0IqOhXzaTmaniQxnPizQo8Qz5fh1BT5/MaiVLNpgyXra1oMRz6qlxs+q/5RxyPbO9/ WsGY3O2AMkkhzZkS1gXuKNKFxaHx/hyfbMOl9oOAWCOMDUmZtq5FubsCEtQtBvrlVY+A W1br4bcFuw8xbirg/om+JxSCESjOxRGWnkMsdrM3Fgwp2QUVxWPrwLfI2Ok/mDJT5+Ro UQ== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3k86hkc4hb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 17 Oct 2022 10:18:34 +0000 Received: from m0098421.ppops.net (m0098421.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 29H9uvB8009858 for ; Mon, 17 Oct 2022 10:18:34 GMT Received: from ppma01fra.de.ibm.com (46.49.7a9f.ip4.static.sl-reverse.com [159.122.73.70]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3k86hkc4gu-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 17 Oct 2022 10:18:34 +0000 Received: from pps.filterd (ppma01fra.de.ibm.com [127.0.0.1]) by ppma01fra.de.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 29HA6O2d014712; Mon, 17 Oct 2022 10:18:32 GMT Received: from b06cxnps3075.portsmouth.uk.ibm.com (d06relay10.portsmouth.uk.ibm.com [9.149.109.195]) by ppma01fra.de.ibm.com with ESMTP id 3k7mg8t488-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 17 Oct 2022 10:18:32 +0000 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 29HAITSZ2032298 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 17 Oct 2022 10:18:29 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5AB73AE045; Mon, 17 Oct 2022 10:18:29 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 21429AE051; Mon, 17 Oct 2022 10:18:29 +0000 (GMT) Received: from a46lp57.lnxne.boe (unknown [9.152.108.100]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 17 Oct 2022 10:18:29 +0000 (GMT) From: Nico Boehr To: kvm@vger.kernel.org Cc: frankja@linux.ibm.com, imbrenda@linux.ibm.com, thuth@redhat.com Subject: [kvm-unit-tests PATCH v7 1/1] s390x: add exittime tests Date: Mon, 17 Oct 2022 12:18:28 +0200 Message-Id: <20221017101828.703068-2-nrb@linux.ibm.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20221017101828.703068-1-nrb@linux.ibm.com> References: <20221017101828.703068-1-nrb@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: hxa1Hx2Jek_YwcPkmwqTww3dJH1c8g_x X-Proofpoint-ORIG-GUID: 8xhdFkiyJfqRStfynoK3N77aWIcYPRGa X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-10-17_07,2022-10-17_02,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 phishscore=0 mlxlogscore=999 impostorscore=0 bulkscore=0 malwarescore=0 lowpriorityscore=0 priorityscore=1501 adultscore=0 spamscore=0 clxscore=1015 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2209130000 definitions=main-2210170058 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Add a test to measure the execution time of several instructions. This can be helpful in finding performance regressions in hypervisor code. All tests are currently reported as PASS, since the baseline for their execution time depends on the respective environment and since needs to be determined on a case-by-case basis. Signed-off-by: Nico Boehr Reviewed-by: Claudio Imbrenda --- s390x/Makefile | 1 + s390x/exittime.c | 296 ++++++++++++++++++++++++++++++++++++++++++++ s390x/unittests.cfg | 4 + 3 files changed, 301 insertions(+) create mode 100644 s390x/exittime.c diff --git a/s390x/Makefile b/s390x/Makefile index fba09bc2df3a..a28c6746cf55 100644 --- a/s390x/Makefile +++ b/s390x/Makefile @@ -37,6 +37,7 @@ tests += $(TEST_DIR)/migration-skey.elf tests += $(TEST_DIR)/panic-loop-extint.elf tests += $(TEST_DIR)/panic-loop-pgm.elf tests += $(TEST_DIR)/migration-sck.elf +tests += $(TEST_DIR)/exittime.elf pv-tests += $(TEST_DIR)/pv-diags.elf diff --git a/s390x/exittime.c b/s390x/exittime.c new file mode 100644 index 000000000000..8ccffbfc879a --- /dev/null +++ b/s390x/exittime.c @@ -0,0 +1,296 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Measure run time of various instructions. Can be used to find runtime + * regressions of instructions which cause exits. + * + * Copyright IBM Corp. 2022 + * + * Authors: + * Nico Boehr + */ +#include +#include +#include +#include +#include +#include +#include +#include + +const uint64_t iters_to_normalize_to = 10000; +char pagebuf[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); + +static void test_sigp_sense_running(long destcpu) +{ + smp_sigp(destcpu, SIGP_SENSE_RUNNING, 0, NULL); +} + +static void test_nop(long ignore) +{ + /* nops don't trap into the hypervisor, so let's test them for reference */ + asm volatile( + "nop" + : + : + : "memory" + ); +} + +static void test_diag9c(long destcpu) +{ + asm volatile( + "diag %[destcpu],0,0x9c" + : + : [destcpu] "d" (destcpu) + ); +} + +static long setup_get_this_cpuaddr(long ignore) +{ + return stap(); +} + +static void test_diag44(long ignore) +{ + asm volatile( + "diag 0,0,0x44" + ); +} + +static void test_stnsm(long ignore) +{ + int out; + + asm volatile( + "stnsm %[out],0xff" + : [out] "=Q" (out) + ); +} + +static void test_stosm(long ignore) +{ + int out; + + asm volatile( + "stosm %[out],0" + : [out] "=Q" (out) + ); +} + +static long setup_ssm(long ignore) +{ + long system_mask = 0; + + asm volatile( + "stosm %[system_mask],0" + : [system_mask] "=Q" (system_mask) + ); + + return system_mask; +} + +static void test_ssm(long old_system_mask) +{ + asm volatile( + "ssm %[old_system_mask]" + : + : [old_system_mask] "Q" (old_system_mask) + ); +} + +static long setup_lctl4(long ignore) +{ + long ctl4_orig = 0; + + asm volatile( + "stctg 4,4,%[ctl4_orig]" + : [ctl4_orig] "=S" (ctl4_orig) + ); + + return ctl4_orig; +} + +static void test_lctl4(long ctl4_orig) +{ + asm volatile( + "lctlg 4,4,%[ctl4_orig]" + : + : [ctl4_orig] "S" (ctl4_orig) + ); +} + +static void test_stpx(long ignore) +{ + unsigned int prefix; + + asm volatile( + "stpx %[prefix]" + : [prefix] "=Q" (prefix) + ); +} + +static void test_stfl(long ignore) +{ + asm volatile( + "stfl 0" + : + : + : "memory" + ); +} + +static void test_epsw(long ignore) +{ + long r1, r2; + + asm volatile( + "epsw %[r1], %[r2]" + : [r1] "=d" (r1), [r2] "=d" (r2) + ); +} + +static void test_illegal(long ignore) +{ + expect_pgm_int(); + asm volatile( + ".word 0" + ); + clear_pgm_int(); +} + +static long setup_servc(long arg) +{ + memset(pagebuf, 0, PAGE_SIZE); + return arg; +} + +static void test_servc(long ignore) +{ + SCCB *sccb = (SCCB *) pagebuf; + + sccb->h.length = 8; + servc(0, (unsigned long) sccb); +} + +static void test_stsi(long fc) +{ + stsi(pagebuf, fc, 2, 2); +} + +struct test { + const char *name; + bool supports_tcg; + /* + * When non-null, will be called once before running the test loop. + * Its return value will be given as argument to testfunc. + */ + long (*setupfunc)(long arg); + void (*testfunc)(long arg); + long arg; + long iters; +} const exittime_tests[] = { + {"nop", true, NULL, test_nop, 0, 200000 }, + {"sigp sense running(0)", true, NULL, test_sigp_sense_running, 0, 20000 }, + {"sigp sense running(1)", true, NULL, test_sigp_sense_running, 1, 20000 }, + {"diag9c(self)", false, setup_get_this_cpuaddr, test_diag9c, 0, 2000 }, + {"diag9c(0)", false, NULL, test_diag9c, 0, 2000 }, + {"diag9c(1)", false, NULL, test_diag9c, 1, 2000 }, + {"diag44", true, NULL, test_diag44, 0, 2000 }, + {"stnsm", true, NULL, test_stnsm, 0, 200000 }, + {"stosm", true, NULL, test_stosm, 0, 200000 }, + {"ssm", true, setup_ssm, test_ssm, 0, 200000 }, + {"lctl4", true, setup_lctl4, test_lctl4, 0, 20000 }, + {"stpx", true, NULL, test_stpx, 0, 2000 }, + {"stfl", true, NULL, test_stfl, 0, 2000 }, + {"epsw", true, NULL, test_epsw, 0, 20000 }, + {"illegal", true, NULL, test_illegal, 0, 2000 }, + {"servc", true, setup_servc, test_servc, 0, 2000 }, + {"stsi122", true, NULL, test_stsi, 1, 200 }, + {"stsi222", true, NULL, test_stsi, 2, 200 }, + {"stsi322", true, NULL, test_stsi, 3, 200 }, +}; + +struct test_result { + uint64_t total; + uint64_t best; + uint64_t average; + uint64_t worst; +}; + +static uint64_t tod_to_us(uint64_t tod) +{ + return tod >> STCK_SHIFT_US; +} + +static uint64_t tod_to_ns(uint64_t tod) +{ + return tod_to_us(tod * 1000); +} + +static uint64_t normalize_iters(uint64_t value_to_normalize, uint64_t iters) +{ + return value_to_normalize * iters_to_normalize_to / iters; +} + +static void report_iteration_result(struct test const* test, struct test_result const* test_result) +{ + uint64_t total = tod_to_ns(normalize_iters(test_result->total, test->iters)), + best = tod_to_ns(normalize_iters(test_result->best, test->iters)), + average = tod_to_ns(normalize_iters(test_result->average, test->iters)), + worst = tod_to_ns(normalize_iters(test_result->worst, test->iters)); + + report_pass( + "total/best/avg/worst %lu.%03lu/%lu.%03lu/%lu.%03lu/%lu.%03lu us", + total / 1000, total % 1000, + best / 1000, best % 1000, + average / 1000, average % 1000, + worst / 1000, worst % 1000 + ); +} + +int main(void) +{ + int i, j, k, testfunc_arg; + const int outer_iters = 100; + struct test const *current_test; + struct test_result result; + uint64_t start, end, elapsed; + + report_prefix_push("exittime"); + report_info("reporting total/best/avg/worst normalized to %lu iterations", iters_to_normalize_to); + + for (i = 0; i < ARRAY_SIZE(exittime_tests); i++) { + current_test = &exittime_tests[i]; + result.total = 0; + result.worst = 0; + result.best = -1; + report_prefix_pushf("%s", current_test->name); + + if (host_is_tcg() && !current_test->supports_tcg) { + report_skip("not supported under TCG"); + report_prefix_pop(); + continue; + } + + testfunc_arg = current_test->arg; + if (current_test->setupfunc) + testfunc_arg = current_test->setupfunc(testfunc_arg); + + for (j = 0; j < outer_iters; j++) { + stckf(&start); + for (k = 0; k < current_test->iters; k++) + current_test->testfunc(testfunc_arg); + stckf(&end); + elapsed = end - start; + result.best = MIN(result.best, elapsed); + result.worst = MAX(result.worst, elapsed); + result.total += elapsed; + } + result.average = result.total / outer_iters; + report_iteration_result(current_test, &result); + report_prefix_pop(); + } + + report_prefix_pop(); + return report_summary(); +} diff --git a/s390x/unittests.cfg b/s390x/unittests.cfg index 2c04ae7c7c15..feb9abf03745 100644 --- a/s390x/unittests.cfg +++ b/s390x/unittests.cfg @@ -201,3 +201,7 @@ timeout = 5 [migration-sck] file = migration-sck.elf groups = migration + +[exittime] +file = exittime.elf +smp = 2