From: Wei Xu <weixugc@google.com>
To: Dave Hansen <dave.hansen@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Huang Ying <ying.huang@intel.com>,
Dan Williams <dan.j.williams@intel.com>,
Yang Shi <shy828301@gmail.com>, Linux MM <linux-mm@kvack.org>,
Greg Thelen <gthelen@google.com>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
Jagdish Gediya <jvgediya@linux.ibm.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Alistair Popple <apopple@nvidia.com>,
Davidlohr Bueso <dave@stgolabs.net>,
Michal Hocko <mhocko@kernel.org>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
Brice Goglin <brice.goglin@gmail.com>,
Feng Tang <feng.tang@intel.com>,
Jonathan Cameron <Jonathan.Cameron@huawei.com>
Subject: Re: RFC: Memory Tiering Kernel Interfaces
Date: Tue, 3 May 2022 00:19:01 -0700 [thread overview]
Message-ID: <CAAPL-u8TtNoonOBDU1HZ-XPA31zsDvDAnO2xDigApypX-+jTYA@mail.gmail.com> (raw)
In-Reply-To: <c18e273b-f30c-da5c-581b-0cc4672f4481@intel.com>
On Mon, May 2, 2022 at 8:20 AM Dave Hansen <dave.hansen@intel.com> wrote:
>
> > The current memory tiering interface needs to be improved to address
> > several important use cases:
>
> FWIW, I totally agree. We knew when that code went in that the default
> ordering was feeble. There were patches to export the demotion order
> and allow it to be modified from userspace, but they were jettisoned at
> some point.
>
> > Memory tiering hierarchy is rebuilt upon hot-add or hot-remove of a
> > memory node, but is NOT rebuilt upon hot-add or hot-remove of a CPU
> > node.
>
> Yeah, this would be a welcome improvement if we can get there.
>
> > * /sys/devices/system/node/memory_tiers
> >
> > Format: node list (one tier per line, in the tier order)
> >
> > When read, list memory nodes by tiers.
>
> Nit: this would seems to violate the one-value-per-file sysfs guideline.
> It can be fixed by making tiers actual objects, which would have some
> other nice benefits too.
>
Good point. One tier per file should work as well. It can be even
better to have a separate tier sub-tree.
next prev parent reply other threads:[~2022-05-03 7:19 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-30 2:10 RFC: Memory Tiering Kernel Interfaces Wei Xu
2022-04-30 3:59 ` Yang Shi
2022-04-30 6:37 ` Wei Xu
2022-05-06 0:01 ` Alistair Popple
2022-05-10 4:32 ` Wei Xu
2022-05-10 5:37 ` Alistair Popple
2022-05-10 11:38 ` Aneesh Kumar K.V
2022-05-11 5:30 ` Wei Xu
2022-05-11 7:34 ` Alistair Popple
2022-05-11 7:49 ` ying.huang
2022-05-11 17:07 ` Wei Xu
2022-05-12 1:42 ` ying.huang
2022-05-12 2:39 ` Wei Xu
2022-05-12 3:13 ` ying.huang
2022-05-12 3:37 ` Wei Xu
2022-05-12 6:24 ` Wei Xu
2022-05-06 18:56 ` Yang Shi
2022-05-09 14:32 ` Hesham Almatary
2022-05-10 3:24 ` Yang Shi
2022-05-10 9:59 ` Hesham Almatary
2022-05-10 12:10 ` Aneesh Kumar K V
2022-05-11 5:42 ` Wei Xu
2022-05-11 7:12 ` Alistair Popple
2022-05-11 9:05 ` Hesham Almatary
2022-05-12 3:02 ` ying.huang
2022-05-12 4:40 ` Aneesh Kumar K V
2022-05-12 4:49 ` Wei Xu
2022-05-10 4:22 ` Wei Xu
2022-05-10 10:01 ` Hesham Almatary
2022-05-10 11:44 ` Aneesh Kumar K.V
2022-05-01 18:35 ` Dan Williams
2022-05-03 6:36 ` Wei Xu
2022-05-06 19:05 ` Yang Shi
2022-05-07 7:56 ` ying.huang
2022-05-01 17:58 ` Davidlohr Bueso
2022-05-02 1:04 ` David Rientjes
2022-05-02 7:23 ` Aneesh Kumar K.V
2022-05-03 2:07 ` Baolin Wang
2022-05-03 6:06 ` Wei Xu
2022-05-03 17:14 ` Alistair Popple
2022-05-03 17:47 ` Dave Hansen
2022-05-03 22:35 ` Alistair Popple
2022-05-03 23:54 ` Dave Hansen
2022-05-04 1:31 ` Wei Xu
2022-05-04 17:02 ` Dave Hansen
2022-05-05 6:35 ` Wei Xu
2022-05-05 14:24 ` Dave Hansen
2022-05-10 4:43 ` Wei Xu
2022-05-02 6:25 ` Aneesh Kumar K.V
2022-05-03 7:02 ` Wei Xu
2022-05-02 15:20 ` Dave Hansen
2022-05-03 7:19 ` Wei Xu [this message]
2022-05-03 19:12 ` Tim Chen
2022-05-05 7:02 ` Wei Xu
2022-05-05 8:57 ` ying.huang
2022-05-05 23:57 ` Alistair Popple
2022-05-06 0:25 ` Alistair Popple
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