From: "Ho-Ren (Jack) Chuang" <horenchuang@bytedance.com>
To: "Huang, Ying" <ying.huang@intel.com>
Cc: Gregory Price <gourry.memverge@gmail.com>,
aneesh.kumar@linux.ibm.com, mhocko@suse.com, tj@kernel.org,
john@jagalactic.com, Eishan Mirakhur <emirakhur@micron.com>,
Vinicius Tavares Petrucci <vtavarespetr@micron.com>,
Ravis OpenSrc <Ravis.OpenSrc@micron.com>,
Alistair Popple <apopple@nvidia.com>,
Srinivasulu Thanneeru <sthanneeru@micron.com>,
Dan Williams <dan.j.williams@intel.com>,
Vishal Verma <vishal.l.verma@intel.com>,
Dave Jiang <dave.jiang@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
"Ho-Ren (Jack) Chuang" <horenc@vt.edu>,
"Ho-Ren (Jack) Chuang" <horenchuang@gmail.com>,
qemu-devel@nongnu.org, Hao Xiang <hao.xiang@bytedance.com>
Subject: Re: [External] Re: [PATCH v6 2/2] memory tier: create CPUless memory tiers after obtaining HMAT info
Date: Thu, 28 Mar 2024 00:54:13 -0700 [thread overview]
Message-ID: <CAKPbEqrhBLQ67ciUTukGTB0eC3G_JHcTEMfbiw_PtnGBSv=ksw@mail.gmail.com> (raw)
In-Reply-To: <87v857kujp.fsf@yhuang6-desk2.ccr.corp.intel.com>
On Wed, Mar 27, 2024 at 6:37 PM Huang, Ying <ying.huang@intel.com> wrote:
>
> "Ho-Ren (Jack) Chuang" <horenchuang@bytedance.com> writes:
>
> [snip]
>
> > @@ -655,6 +672,34 @@ void mt_put_memory_types(struct list_head *memory_types)
> > }
> > EXPORT_SYMBOL_GPL(mt_put_memory_types);
> >
> > +/*
> > + * This is invoked via `late_initcall()` to initialize memory tiers for
> > + * CPU-less memory nodes after driver initialization, which is
> > + * expected to provide `adistance` algorithms.
> > + */
> > +static int __init memory_tier_late_init(void)
> > +{
> > + int nid;
> > +
> > + mutex_lock(&memory_tier_lock);
> > + for_each_node_state(nid, N_MEMORY)
> > + if (!node_state(nid, N_CPU) &&
> > + node_memory_types[nid].memtype == NULL)
>
> Think about this again. It seems that it is better to check
> "node_memory_types[nid].memtype == NULL" only here. Because for all
> node with N_CPU in memory_tier_init(), "node_memory_types[nid].memtype"
> will be !NULL. And it's possible (in theory) that some nodes becomes
> "node_state(nid, N_CPU) == true" between memory_tier_init() and
> memory_tier_late_init().
>
> Otherwise, Looks good to me. Feel free to add
>
> Reviewed-by: "Huang, Ying" <ying.huang@intel.com>
>
> in the future version.
>
Thank you Huang, Ying for your endorsement and
the feedback you've been giving!
> > + /*
> > + * Some device drivers may have initialized memory tiers
> > + * between `memory_tier_init()` and `memory_tier_late_init()`,
> > + * potentially bringing online memory nodes and
> > + * configuring memory tiers. Exclude them here.
> > + */
> > + set_node_memory_tier(nid);
> > +
> > + establish_demotion_targets();
> > + mutex_unlock(&memory_tier_lock);
> > +
> > + return 0;
> > +}
> > +late_initcall(memory_tier_late_init);
> > +
>
> [snip]
>
> --
> Best Regards,
> Huang, Ying
--
Best regards,
Ho-Ren (Jack) Chuang
莊賀任
prev parent reply other threads:[~2024-03-28 7:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-27 7:27 [PATCH v6 0/2] Improved Memory Tier Creation for CPUless NUMA Nodes Ho-Ren (Jack) Chuang
2024-03-27 7:27 ` [PATCH v6 1/2] memory tier: dax/kmem: introduce an abstract layer for finding, allocating, and putting memory types Ho-Ren (Jack) Chuang
2024-03-27 7:27 ` [PATCH v6 2/2] memory tier: create CPUless memory tiers after obtaining HMAT info Ho-Ren (Jack) Chuang
2024-03-28 1:35 ` Huang, Ying
2024-03-28 7:54 ` Ho-Ren (Jack) Chuang [this message]
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