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Thu, 17 Apr 2025 21:07:03 +0000 Received: from MW4PR10MB5749.namprd10.prod.outlook.com ([fe80::9a04:a919:657a:7454]) by MW4PR10MB5749.namprd10.prod.outlook.com ([fe80::9a04:a919:657a:7454%3]) with mapi id 15.20.8632.025; Thu, 17 Apr 2025 21:07:03 +0000 Message-ID: <66884086-39fc-4f65-b207-08758c0756b8@oracle.com> Date: Thu, 17 Apr 2025 14:07:00 -0700 User-Agent: Betterbird (macOS/Intel) Subject: Re: [PATCH v3 0/2] sched/numa: Skip VMA scanning on memory pinned To: Andrew Morton Cc: peterz@infradead.org, mgorman@suse.de, mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, tj@kernel.org, rostedt@goodmis.org, llong@redhat.com, kprateek.nayak@amd.com, raghavendra.kt@amd.com, yu.c.chen@intel.com, tim.c.chen@intel.com, vineethr@linux.ibm.com, chris.hyser@oracle.com, daniel.m.jordan@oracle.com, lorenzo.stoakes@oracle.com, mkoutny@suse.com, Dhaval.Giani@amd.com, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org References: <20250417191543.1781862-1-libo.chen@oracle.com> <20250417131236.c47ce477c0e68dbb06a4fabb@linux-foundation.org> Content-Language: en-US From: Libo Chen In-Reply-To: <20250417131236.c47ce477c0e68dbb06a4fabb@linux-foundation.org> Content-Type: text/plain; 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Yet to find perf diff on >> will-it-scale, so not included here. Plan to run more workloads. >> 2. add tracepoint. >> 3. To peterz's comment, this will make it impossible to attract tasks to >> those memory just like other VMA skippings. This is the current >> implementation, I think we can improve that in the future, but at the >> moment it's probabaly better to keep it consistent. >> >> v2->v3: >> 1. add enable_cpuset() based on Mel's suggestion but again I think it's >> redundant >> 2. print out nodemask with %*p.. format in the tracepoint > > I do agree with Mel - bitmap_weight() is somewhat expensive and > cpusets_enabled() is super fast. So the benefit to > cpusets_enabled()=false kernels will exceed to cost to > cpusets_enabled()=true kernels. > Ah yes, that's right. Thanks for grabbing it~ Libo > This isn't traditionally mm.git material, but it's close. I'll grab > the patchset for some testing. and shall drop it again if it turns up > via another tree. >