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Wed, 29 Apr 2020 08:56:15 +0000 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06avi18878370.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 03T8uDf361473168 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 29 Apr 2020 08:56:13 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 28B78AE051; Wed, 29 Apr 2020 08:56:13 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D6942AE045; Wed, 29 Apr 2020 08:56:07 +0000 (GMT) Received: from localhost.localdomain (unknown [9.85.81.16]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 29 Apr 2020 08:56:07 +0000 (GMT) Subject: Re: [PATCH v7 1/5] powerpc/perf/hv-24x7: Fix inconsistent output values incase multiple hv-24x7 events run To: Kajol Jain , acme@kernel.org, linuxppc-dev@lists.ozlabs.org, mpe@ellerman.id.au, sukadev@linux.vnet.ibm.com References: <20200327063642.26175-1-kjain@linux.ibm.com> <20200327063642.26175-2-kjain@linux.ibm.com> From: Madhavan Srinivasan Message-ID: <3c209251-ceab-7381-99e3-b5664ce3104b@linux.ibm.com> Date: Wed, 29 Apr 2020 14:26:06 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <20200327063642.26175-2-kjain@linux.ibm.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138, 18.0.676 definitions=2020-04-29_02:2020-04-28, 2020-04-29 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 priorityscore=1501 phishscore=0 clxscore=1015 adultscore=0 suspectscore=0 spamscore=0 lowpriorityscore=0 malwarescore=0 impostorscore=0 mlxlogscore=999 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004290067 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, ravi.bangoria@linux.ibm.com, maddy@linux.vnet.ibm.com, tglx@linutronix.de, jmario@redhat.com, mpetlan@redhat.com, peterz@infradead.org, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, alexander.shishkin@linux.intel.com, linux-perf-users@vger.kernel.org, ak@linux.intel.com, yao.jin@linux.intel.com, anju@linux.vnet.ibm.com, mamatha4@linux.vnet.ibm.com, jolsa@kernel.org, namhyung@kernel.org, mingo@kernel.org, kan.liang@linux.intel.com Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 3/27/20 12:06 PM, Kajol Jain wrote: > Commit 2b206ee6b0df ("powerpc/perf/hv-24x7: Display change in counter > values")' added to print _change_ in the counter value rather then raw > value for 24x7 counters. Incase of transactions, the event count > is set to 0 at the beginning of the transaction. It also sets > the event's prev_count to the raw value at the time of initialization. > Because of setting event count to 0, we are seeing some weird behaviour, > whenever we run multiple 24x7 events at a time. > > For example: > > command#: ./perf stat -e "{hv_24x7/PM_MCS01_128B_RD_DISP_PORT01,chip=0/, > hv_24x7/PM_MCS01_128B_RD_DISP_PORT01,chip=1/}" > -C 0 -I 1000 sleep 100 > > 1.000121704 120 hv_24x7/PM_MCS01_128B_RD_DISP_PORT01,chip=0/ > 1.000121704 5 hv_24x7/PM_MCS01_128B_RD_DISP_PORT01,chip=1/ > 2.000357733 8 hv_24x7/PM_MCS01_128B_RD_DISP_PORT01,chip=0/ > 2.000357733 10 hv_24x7/PM_MCS01_128B_RD_DISP_PORT01,chip=1/ > 3.000495215 18,446,744,073,709,551,616 hv_24x7/PM_MCS01_128B_RD_DISP_PORT01,chip=0/ > 3.000495215 18,446,744,073,709,551,616 hv_24x7/PM_MCS01_128B_RD_DISP_PORT01,chip=1/ > 4.000641884 56 hv_24x7/PM_MCS01_128B_RD_DISP_PORT01,chip=0/ > 4.000641884 18,446,744,073,709,551,616 hv_24x7/PM_MCS01_128B_RD_DISP_PORT01,chip=1/ > 5.000791887 18,446,744,073,709,551,616 hv_24x7/PM_MCS01_128B_RD_DISP_PORT01,chip=0/ > > Getting these large values in case we do -I. > > As we are setting event_count to 0, for interval case, overall event_count is not > coming in incremental order. As we may can get new delta lesser then previous count. > Because of which when we print intervals, we are getting negative value which create > these large values. > > This patch removes part where we set event_count to 0 in function > 'h_24x7_event_read'. There won't be much impact as we do set event->hw.prev_count > to the raw value at the time of initialization to print change value. > > With this patch > In power9 platform > > command#: ./perf stat -e "{hv_24x7/PM_MCS01_128B_RD_DISP_PORT01,chip=0/, > hv_24x7/PM_MCS01_128B_RD_DISP_PORT01,chip=1/}" > -C 0 -I 1000 sleep 100 > > 1.000117685 93 hv_24x7/PM_MCS01_128B_RD_DISP_PORT01,chip=0/ > 1.000117685 1 hv_24x7/PM_MCS01_128B_RD_DISP_PORT01,chip=1/ > 2.000349331 98 hv_24x7/PM_MCS01_128B_RD_DISP_PORT01,chip=0/ > 2.000349331 2 hv_24x7/PM_MCS01_128B_RD_DISP_PORT01,chip=1/ > 3.000495900 131 hv_24x7/PM_MCS01_128B_RD_DISP_PORT01,chip=0/ > 3.000495900 4 hv_24x7/PM_MCS01_128B_RD_DISP_PORT01,chip=1/ > 4.000645920 204 hv_24x7/PM_MCS01_128B_RD_DISP_PORT01,chip=0/ > 4.000645920 61 hv_24x7/PM_MCS01_128B_RD_DISP_PORT01,chip=1/ > 4.284169997 22 hv_24x7/PM_MCS01_128B_RD_DISP_PORT01,chip=0/ > > Signed-off-by: Kajol Jain > Suggested-by: Sukadev Bhattiprolu Tested-by: Madhavan Srinivasan > --- > arch/powerpc/perf/hv-24x7.c | 10 ---------- > 1 file changed, 10 deletions(-) > > diff --git a/arch/powerpc/perf/hv-24x7.c b/arch/powerpc/perf/hv-24x7.c > index 573e0b309c0c..48e8f4b17b91 100644 > --- a/arch/powerpc/perf/hv-24x7.c > +++ b/arch/powerpc/perf/hv-24x7.c > @@ -1400,16 +1400,6 @@ static void h_24x7_event_read(struct perf_event *event) > h24x7hw = &get_cpu_var(hv_24x7_hw); > h24x7hw->events[i] = event; > put_cpu_var(h24x7hw); > - /* > - * Clear the event count so we can compute the _change_ > - * in the 24x7 raw counter value at the end of the txn. > - * > - * Note that we could alternatively read the 24x7 value > - * now and save its value in event->hw.prev_count. But > - * that would require issuing a hcall, which would then > - * defeat the purpose of using the txn interface. > - */ > - local64_set(&event->count, 0); > } > > put_cpu_var(hv_24x7_reqb);