From: "Huang, Ying" <ying.huang@intel.com>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: Alistair Popple <apopple@nvidia.com>,
linux-mm@kvack.org, akpm@linux-foundation.org,
Wei Xu <weixugc@google.com>, Yang Shi <shy828301@gmail.com>,
Davidlohr Bueso <dave@stgolabs.net>,
Tim C Chen <tim.c.chen@intel.com>,
Michal Hocko <mhocko@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Hesham Almatary <hesham.almatary@huawei.com>,
Dave Hansen <dave.hansen@intel.com>,
Jonathan Cameron <Jonathan.Cameron@huawei.com>,
Dan Williams <dan.j.williams@intel.com>,
Johannes Weiner <hannes@cmpxchg.org>,
jvgediya.oss@gmail.com
Subject: Re: [PATCH v10 3/8] mm/demotion: Add hotplug callbacks to handle new numa node onlined
Date: Thu, 28 Jul 2022 14:42:40 +0800 [thread overview]
Message-ID: <8735elohzz.fsf@yhuang6-desk2.ccr.corp.intel.com> (raw)
In-Reply-To: <87h733rwzr.fsf@linux.ibm.com> (Aneesh Kumar K. V.'s message of "Wed, 27 Jul 2022 10:08:16 +0530")
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> writes:
> "Huang, Ying" <ying.huang@intel.com> writes:
>
>> Aneesh Kumar K V <aneesh.kumar@linux.ibm.com> writes:
>>
>>> On 7/26/22 9:33 AM, Huang, Ying wrote:
>>>> "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> writes:
[snip]
>>>>>
>>>>> +static struct memory_tier *__node_get_memory_tier(int node)
>>>>> +{
>>>>> + struct memory_tier *memtier;
>>>>> +
>>>>> + list_for_each_entry(memtier, &memory_tiers, list) {
>>>>> + if (node_isset(node, memtier->nodelist))
>>>>> + return memtier;
>>>>> + }
>>>>> + return NULL;
>>>>> +}
>>>>> +
>>>>> +static void init_node_memory_tier(int node)
>>>>
>>>> set_node_memory_tier()?
>>>
>>> That was done based on feedback from Alistair
>>>
>>> https://lore.kernel.org/linux-mm/87h73iapg1.fsf@nvdebian.thelocal
>>>
>>>>
>>>>> +{
>>>>> + int perf_level;
>>>>> + struct memory_tier *memtier;
>>>>> +
>>>>> + mutex_lock(&memory_tier_lock);
>>>>> +
>>>>> + memtier = __node_get_memory_tier(node);
>>>>> + if (!memtier) {
>>>>> + perf_level = node_devices[node]->perf_level;
>>>>> + memtier = find_create_memory_tier(perf_level);
>>>>> + node_set(node, memtier->nodelist);
>>>>> + }
>>
>> It's related to Alistair's comments too. When will memtier != NULL
>> here? We may need just VM_WARN_ON() here?
>
> When the platform driver sets memory tier directly. With the old code
> it can happen when dax/kmem register a node to a memory tier. With
> memory_type proposal this can happen if the node is part of memory
> type that is already added to a memory tier.
Let's look at what it looks like with memory_type in place.
Best Regards,
Huang, Ying
>>
>>>>> + mutex_unlock(&memory_tier_lock);
>>>>> +}
>>>>> +
[snip]
next prev parent reply other threads:[~2022-07-28 6:42 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-20 2:59 [PATCH v10 0/8] mm/demotion: Memory tiers and demotion Aneesh Kumar K.V
2022-07-20 2:59 ` [PATCH v10 1/8] mm/demotion: Add support for explicit memory tiers Aneesh Kumar K.V
2022-07-26 3:53 ` Huang, Ying
2022-07-26 11:59 ` Aneesh Kumar K V
2022-07-27 1:16 ` Huang, Ying
2022-07-28 17:23 ` Johannes Weiner
2022-07-20 2:59 ` [PATCH v10 2/8] mm/demotion: Move memory demotion related code Aneesh Kumar K.V
2022-07-20 2:59 ` [PATCH v10 3/8] mm/demotion: Add hotplug callbacks to handle new numa node onlined Aneesh Kumar K.V
2022-07-26 4:03 ` Huang, Ying
2022-07-26 12:03 ` Aneesh Kumar K V
2022-07-27 1:53 ` Huang, Ying
2022-07-27 4:38 ` Aneesh Kumar K.V
2022-07-28 6:42 ` Huang, Ying [this message]
2022-07-20 2:59 ` [PATCH v10 4/8] mm/demotion/dax/kmem: Set node's performance level to MEMTIER_PERF_LEVEL_PMEM Aneesh Kumar K.V
2022-07-21 6:07 ` kernel test robot
2022-07-25 6:37 ` Huang, Ying
2022-07-25 6:48 ` Aneesh Kumar K V
2022-07-25 8:35 ` Huang, Ying
2022-07-25 8:42 ` Aneesh Kumar K V
2022-07-26 2:13 ` Huang, Ying
2022-07-27 4:31 ` Aneesh Kumar K.V
2022-07-28 6:39 ` Huang, Ying
2022-07-20 2:59 ` [PATCH v10 5/8] mm/demotion: Build demotion targets based on explicit memory tiers Aneesh Kumar K.V
2022-07-20 3:38 ` Aneesh Kumar K.V
2022-07-21 0:02 ` kernel test robot
2022-07-26 7:44 ` Huang, Ying
2022-07-26 12:30 ` Aneesh Kumar K V
2022-07-27 1:40 ` Huang, Ying
2022-07-27 4:35 ` Aneesh Kumar K.V
2022-07-28 6:51 ` Huang, Ying
2022-08-03 3:18 ` Aneesh Kumar K.V
2022-08-04 4:19 ` Huang, Ying
2022-07-20 2:59 ` [PATCH v10 6/8] mm/demotion: Add pg_data_t member to track node memory tier details Aneesh Kumar K.V
2022-07-26 8:02 ` Huang, Ying
2022-07-20 2:59 ` [PATCH v10 7/8] mm/demotion: Demote pages according to allocation fallback order Aneesh Kumar K.V
2022-07-26 8:24 ` Huang, Ying
2022-07-20 2:59 ` [PATCH v10 8/8] mm/demotion: Update node_is_toptier to work with memory tiers Aneesh Kumar K.V
2022-07-25 8:54 ` Huang, Ying
2022-07-25 8:56 ` Aneesh Kumar K V
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