From: Gregory Price <gregory.price@memverge.com>
To: "Huang, Ying" <ying.huang@intel.com>
Cc: Gregory Price <gourry.memverge@gmail.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-cxl@vger.kernel.org, akpm@linux-foundation.org,
sthanneeru@micron.com,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
Wei Xu <weixugc@google.com>, Alistair Popple <apopple@nvidia.com>,
Dan Williams <dan.j.williams@intel.com>,
Dave Hansen <dave.hansen@intel.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Jonathan Cameron <Jonathan.Cameron@huawei.com>,
Michal Hocko <mhocko@kernel.org>, Tim Chen <tim.c.chen@intel.com>,
Yang Shi <shy828301@gmail.com>
Subject: Re: [RFC PATCH v2 0/3] mm: mempolicy: Multi-tier weighted interleaving
Date: Wed, 25 Oct 2023 15:51:33 -0400 [thread overview]
Message-ID: <ZTlxxR0ntEzBPwre@memverge.com> (raw)
In-Reply-To: <87lebrec82.fsf@yhuang6-desk2.ccr.corp.intel.com>
On Wed, Oct 25, 2023 at 09:13:01AM +0800, Huang, Ying wrote:
> Gregory Price <gregory.price@memverge.com> writes:
>
> > On Mon, Oct 23, 2023 at 10:09:56AM +0800, Huang, Ying wrote:
> >> Gregory Price <gregory.price@memverge.com> writes:
> >>
> >> > Depends. if a user explicitly launches with `numactl --cpunodebind=0`
> >> > then yes, you can force a task (and all its children) to run on node0.
> >>
> >> IIUC, in your example, the `numactl` command line will be
> >>
> >> numactl --cpunodebind=0 --weighted-interleave=0,1,2,3
> >>
> >> That is, the CPU is restricted to node 0, while memory is distributed to
> >> all nodes. This doesn't sound like reasonable for me.
> >>
> >
> > It being reasonable isn't really relevant. You can do this today with
> > normal interleave:
> >
> > numactl --cpunodebind=0 --interleave=0,1,2,3
> >
> > The only difference between this method and that is the application of
> > weights. Doesn't seem reasonable to lock users out of doing it.
>
> Do you have some real use case?
>
I don't, but this is how mempolicy and numactl presently work. You can
do this today with the current kernel. I'm simply extending it to
include weights.
~Gregory
next prev parent reply other threads:[~2023-10-25 19:51 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-09 20:42 Gregory Price
2023-10-09 20:42 ` [RFC PATCH v2 1/3] mm/memory-tiers: change mutex to rw semaphore Gregory Price
2023-10-09 20:42 ` [RFC PATCH v2 2/3] mm/memory-tiers: Introduce sysfs for tier interleave weights Gregory Price
2023-10-09 20:42 ` [RFC PATCH v2 3/3] mm/mempolicy: modify interleave mempolicy to use memtier weights Gregory Price
2023-10-11 21:15 ` [RFC PATCH v2 0/3] mm: mempolicy: Multi-tier weighted interleaving Matthew Wilcox
2023-10-10 1:07 ` Gregory Price
2023-10-16 7:57 ` Huang, Ying
2023-10-17 1:28 ` Gregory Price
2023-10-18 8:29 ` Huang, Ying
2023-10-17 2:52 ` Gregory Price
2023-10-19 6:28 ` Huang, Ying
2023-10-18 2:47 ` Gregory Price
2023-10-20 6:11 ` Huang, Ying
2023-10-19 13:26 ` Gregory Price
2023-10-23 2:09 ` Huang, Ying
2023-10-24 15:32 ` Gregory Price
2023-10-25 1:13 ` Huang, Ying
2023-10-25 19:51 ` Gregory Price [this message]
2023-10-30 2:20 ` Huang, Ying
2023-10-30 4:19 ` Gregory Price
2023-10-30 5:23 ` Huang, Ying
2023-10-18 8:31 ` Huang, Ying
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