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Tue, 13 Aug 2019 18:14:09 +0000 (GMT) Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6C952C6059; Tue, 13 Aug 2019 18:14:09 +0000 (GMT) Received: from localhost (unknown [9.41.101.192]) by b03ledav006.gho.boulder.ibm.com (Postfix) with ESMTP; Tue, 13 Aug 2019 18:14:09 +0000 (GMT) From: Nathan Lynch To: Gautham R Shenoy Subject: Re: [PATCH v2 2/3] powerpc/rtas: allow rescheduling while changing cpu states In-Reply-To: References: <20190802192926.19277-1-nathanl@linux.ibm.com> <20190802192926.19277-3-nathanl@linux.ibm.com> Date: Tue, 13 Aug 2019 13:14:09 -0500 Message-ID: <87zhkdrkzy.fsf@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-08-13_06:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=649 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1908130171 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: ego@linux.vnet.ibm.com, linuxppc-dev Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Gautham R Shenoy writes: > On Sat, Aug 3, 2019 at 1:03 AM Nathan Lynch wrote: >> >> rtas_cpu_state_change_mask() potentially operates on scores of cpus, >> so explicitly allow rescheduling in the loop body. >> > > Are we seeing softlockups/rcu stalls while running this ? I have not seen a report yet, but since the loop is bound only by the number of processors in the LPAR I suspect it's only a matter of time. > Reviewed-by: Gautham R. Shenoy Thanks!