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From: Wei Xu <weixugc@google.com>
To: Aneesh Kumar K V <aneesh.kumar@linux.ibm.com>
Cc: Huang Ying <ying.huang@intel.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Greg Thelen <gthelen@google.com>, Yang Shi <shy828301@gmail.com>,
	Davidlohr Bueso <dave@stgolabs.net>,
	Tim C Chen <tim.c.chen@intel.com>,
	Brice Goglin <brice.goglin@gmail.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>,
	Alistair Popple <apopple@nvidia.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Feng Tang <feng.tang@intel.com>, Linux MM <linux-mm@kvack.org>,
	Jagdish Gediya <jvgediya@linux.ibm.com>,
	Baolin Wang <baolin.wang@linux.alibaba.com>,
	David Rientjes <rientjes@google.com>
Subject: Re: RFC: Memory Tiering Kernel Interfaces (v3)
Date: Fri, 27 May 2022 09:30:10 -0700	[thread overview]
Message-ID: <CAAPL-u_NwJuxWe7Wfn3A1sut+QwEmoZh2QUBQKNPq4bU=NjybA@mail.gmail.com> (raw)
In-Reply-To: <c453491b-6dc1-a008-d6f4-3c806eebd2ef@linux.ibm.com>

On Fri, May 27, 2022 at 6:41 AM Aneesh Kumar K V
<aneesh.kumar@linux.ibm.com> wrote:
>
> On 5/27/22 2:52 AM, Wei Xu wrote:
>
> >    The order of memory tiers is determined by their rank values, not by
> >    their memtier device names.
> >
> >    - /sys/devices/system/memtier/possible
> >
> >      Format: ordered list of "memtier(rank)"
> >      Example: 0(64), 1(128), 2(192)
> >
> >      Read-only.  When read, list all available memory tiers and their
> >      associated ranks, ordered by the rank values (from the highest
> >       tier to the lowest tier).
> >
>
> Did we discuss the need for this? I haven't done this in the patch
> series I sent across.

The "possible" file is only needed if we decide to hide the
directories of memtiers that have no nodes.  We can remove this
interface and always show all memtier directories to keep things
simpler.

> We do have
> /sys/devices/system/memtier/default_rank which should allow user to
> identify the default rank to which memory would get added via hotplug if
> the NUMA node is not part of any memory tier.

Sounds good to me to have it.

>
> -aneesh

  reply	other threads:[~2022-05-27 16:30 UTC|newest]

Thread overview: 66+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-26 21:22 RFC: Memory Tiering Kernel Interfaces (v3) Wei Xu
2022-05-27  2:58 ` Ying Huang
2022-05-27 14:05   ` Hesham Almatary
2022-05-27 16:25     ` Wei Xu
2022-05-27 12:25 ` [RFC PATCH v4 0/7] mm/demotion: Memory tiers and demotion Aneesh Kumar K.V
2022-05-27 12:25   ` [RFC PATCH v4 1/7] mm/demotion: Add support for explicit memory tiers Aneesh Kumar K.V
2022-06-02  6:07     ` Ying Huang
2022-06-06  2:49       ` Ying Huang
2022-06-06  3:56         ` Aneesh Kumar K V
2022-06-06  5:33           ` Ying Huang
2022-06-06  6:01             ` Aneesh Kumar K V
2022-06-06  6:27               ` Aneesh Kumar K.V
2022-06-06  7:53                 ` Ying Huang
2022-06-06  8:01                   ` Aneesh Kumar K V
2022-06-06  8:52                     ` Ying Huang
2022-06-06  9:02                       ` Aneesh Kumar K V
2022-06-08  1:24                         ` Ying Huang
2022-06-08  7:16     ` Ying Huang
2022-06-08  8:24       ` Aneesh Kumar K V
2022-06-08  8:27         ` Ying Huang
2022-05-27 12:25   ` [RFC PATCH v4 2/7] mm/demotion: Expose per node memory tier to sysfs Aneesh Kumar K.V
     [not found]     ` <20220527151531.00002a0c@Huawei.com>
2022-06-03  8:40       ` Aneesh Kumar K V
2022-06-06 14:59         ` Jonathan Cameron
2022-06-06 16:01           ` Aneesh Kumar K V
2022-06-06 16:16             ` Jonathan Cameron
2022-06-06 16:39               ` Aneesh Kumar K V
2022-06-06 17:46                 ` Aneesh Kumar K.V
2022-06-08  7:18     ` Ying Huang
2022-06-08  8:25       ` Aneesh Kumar K V
2022-06-08  8:29         ` Ying Huang
2022-05-27 12:25   ` [RFC PATCH v4 3/7] mm/demotion: Build demotion targets based on explicit memory tiers Aneesh Kumar K.V
2022-05-30  3:35     ` [mm/demotion] 8ebccd60c2: BUG:sleeping_function_called_from_invalid_context_at_mm/compaction.c kernel test robot
2022-05-27 12:25   ` [RFC PATCH v4 4/7] mm/demotion/dax/kmem: Set node's memory tier to MEMORY_TIER_PMEM Aneesh Kumar K.V
2022-06-01  6:29     ` Bharata B Rao
2022-06-01 13:49       ` Aneesh Kumar K V
2022-06-02  6:36         ` Bharata B Rao
2022-06-03  9:04           ` Aneesh Kumar K V
2022-06-06 10:11             ` Bharata B Rao
2022-06-06 10:16               ` Aneesh Kumar K V
2022-06-06 11:54                 ` Aneesh Kumar K.V
2022-06-06 12:09                   ` Bharata B Rao
2022-06-06 13:00                     ` Aneesh Kumar K V
2022-05-27 12:25   ` [RFC PATCH v4 5/7] mm/demotion: Add support to associate rank with memory tier Aneesh Kumar K.V
     [not found]     ` <20220527154557.00002c56@Huawei.com>
2022-05-27 15:45       ` Aneesh Kumar K V
2022-05-30 12:36         ` Jonathan Cameron
2022-06-02  6:41     ` Ying Huang
2022-05-27 12:25   ` [RFC PATCH v4 6/7] mm/demotion: Add support for removing node from demotion memory tiers Aneesh Kumar K.V
2022-06-02  6:43     ` Ying Huang
2022-05-27 12:25   ` [RFC PATCH v4 7/7] mm/demotion: Demote pages according to allocation fallback order Aneesh Kumar K.V
2022-06-02  7:35     ` Ying Huang
2022-06-03 15:09       ` Aneesh Kumar K V
2022-06-06  0:43         ` Ying Huang
2022-06-06  4:07           ` Aneesh Kumar K V
2022-06-06  5:26             ` Ying Huang
2022-06-06  6:21               ` Aneesh Kumar K.V
2022-06-06  7:42                 ` Ying Huang
2022-06-06  8:02                   ` Aneesh Kumar K V
2022-06-06  8:06                     ` Ying Huang
2022-06-06 17:07               ` Yang Shi
2022-05-27 13:40 ` RFC: Memory Tiering Kernel Interfaces (v3) Aneesh Kumar K V
2022-05-27 16:30   ` Wei Xu [this message]
2022-05-29  4:31     ` Ying Huang
2022-05-30 12:50       ` Jonathan Cameron
2022-05-31  1:57         ` Ying Huang
2022-06-07 19:25         ` Tim Chen
2022-06-08  4:41           ` Aneesh Kumar K V

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