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Wed, 15 Feb 2023 02:53:06 +0000 (GMT) Message-ID: <4b22740d-6cd4-2485-7a26-c73c8bb6be27@linux.ibm.com> Date: Wed, 15 Feb 2023 08:23:05 +0530 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.6.0 Subject: Re: [PATCH v18 5/7] kexec: exclude hot remove cpu from elfcorehdr notes To: Eric DeVolder , Thomas Gleixner , linux-kernel@vger.kernel.org, x86@kernel.org, kexec@lists.infradead.org, ebiederm@xmission.com, dyoung@redhat.com, bhe@redhat.com, vgoyal@redhat.com Cc: mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, nramas@linux.microsoft.com, thomas.lendacky@amd.com, robh@kernel.org, efault@gmx.de, rppt@kernel.org, david@redhat.com, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com References: <20230131224236.122805-1-eric.devolder@oracle.com> <20230131224236.122805-6-eric.devolder@oracle.com> <87sffpzkle.ffs@tglx> <87h6vw2rwf.ffs@tglx> <7580421a-648a-2c4b-3c33-82e7622d9585@oracle.com> <24034f33-739b-e5f5-40c0-8d5abeb1ad89@oracle.com> <18c57fd0-2ad0-361a-9a53-ac49c372f021@linux.ibm.com> <87ttzpzpzx.ffs@tglx> Content-Language: en-US From: Sourabh Jain In-Reply-To: <87ttzpzpzx.ffs@tglx> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: CLg_oi2szPZcFT6u2gma6lTr1KgQeZlV X-Proofpoint-GUID: VUkDzequ_XNonaN8X033IYNY-j6xIXOH X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.170.22 definitions=2023-02-14_17,2023-02-14_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 mlxscore=0 malwarescore=0 mlxlogscore=999 suspectscore=0 lowpriorityscore=0 adultscore=0 impostorscore=0 spamscore=0 bulkscore=0 priorityscore=1501 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2302150022 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 13/02/23 18:22, Thomas Gleixner wrote: > On Mon, Feb 13 2023 at 10:10, Sourabh Jain wrote: >> The sysconf document says _SC_NPROCESSORS_CONF is processors configured, >> isn't that equivalent to possible CPUs? > glibc tries to evaluate that in the following order: > > 1) /sys/devices/system/cpu/cpu* > > That's present CPUs not possible CPUs > > 2) /proc/stat > > That's online CPUs > > 3) sched_getaffinity() > > That's online CPUs at best. In the worst case it's an affinity mask > which is set on a process group Thanks for the clarification Thomas. - Sourabh