linux-kernel - Re: [External] Re: [PATCH v10 2/2] memory tier: create CPUless memory tiers after obtaining HMAT info

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Date: Thu, 4 Apr 2024 14:04:51 -0700
From: "Ho-Ren (Jack) Chuang" <horenchuang@...edance.com>
To: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: "Huang, Ying" <ying.huang@...el.com>, Gregory Price <gourry.memverge@...il.com>, 
	aneesh.kumar@...ux.ibm.com, mhocko@...e.com, tj@...nel.org, 
	john@...alactic.com, Eishan Mirakhur <emirakhur@...ron.com>, 
	Vinicius Tavares Petrucci <vtavarespetr@...ron.com>, Ravis OpenSrc <Ravis.OpenSrc@...ron.com>, 
	Alistair Popple <apopple@...dia.com>, Srinivasulu Thanneeru <sthanneeru@...ron.com>, 
	SeongJae Park <sj@...nel.org>, Dan Williams <dan.j.williams@...el.com>, 
	Vishal Verma <vishal.l.verma@...el.com>, Dave Jiang <dave.jiang@...el.com>, 
	Andrew Morton <akpm@...ux-foundation.org>, nvdimm@...ts.linux.dev, 
	linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Linux Memory Management List <linux-mm@...ck.org>, "Ho-Ren (Jack) Chuang" <horenc@...edu>, 
	"Ho-Ren (Jack) Chuang" <horenchuang@...il.com>, qemu-devel@...gnu.org, 
	Hao Xiang <hao.xiang@...edance.com>
Subject: Re: [External] Re: [PATCH v10 2/2] memory tier: create CPUless memory
 tiers after obtaining HMAT info

Hi Jonathan,

Thank you! I will fix them and send a V11 soon.

On Thu, Apr 4, 2024 at 6:37 AM Jonathan Cameron
<Jonathan.Cameron@...wei.com> wrote:
>
> <snip>
>
> > > > @@ -858,7 +910,8 @@ static int __init memory_tier_init(void)
> > > >        * For now we can have 4 faster memory tiers with smaller adistance
> > > >        * than default DRAM tier.
> > > >        */
> > > > -     default_dram_type = alloc_memory_type(MEMTIER_ADISTANCE_DRAM);
> > > > +     default_dram_type = mt_find_alloc_memory_type(MEMTIER_ADISTANCE_DRAM,
> > > > +                                                                     &default_memory_types);
> > >
> > > Unusual indenting.  Align with just after (
> > >
> >
> > Aligning with "(" will exceed 100 columns. Would that be acceptable?
> I think we are talking cross purposes.
>
>         default_dram_type = mt_find_alloc_memory_type(MEMTIER_ADISTANCE_DRAM,
>                                                       &default_memory_types);
>
> Is what I was suggesting.
>

Oh, now I see. Thanks!

> >
> > > >       if (IS_ERR(default_dram_type))
> > > >               panic("%s() failed to allocate default DRAM tier\n", __func__);
> > > >
> > > > @@ -868,6 +921,14 @@ static int __init memory_tier_init(void)
> > > >        * types assigned.
> > > >        */
> > > >       for_each_node_state(node, N_MEMORY) {
> > > > +             if (!node_state(node, N_CPU))
> > > > +                     /*
> > > > +                      * Defer memory tier initialization on CPUless numa nodes.
> > > > +                      * These will be initialized after firmware and devices are
> > >
> > > I think this wraps at just over 80 chars.  Seems silly to wrap so tightly and not
> > > quite fit under 80. (this is about 83 chars.
> > >
> >
> > I can fix this.
> > I have a question. From my patch, this is <80 chars. However,
> > in an email, this is >80 chars. Does that mean we need to
> > count the number of chars in an email, not in a patch? Or if I
> > missed something? like vim configuration or?
>
> 3 tabs + 1 space + the text from * (58)
> = 24 + 1 + 58 = 83
>
> Advantage of using claws email for kernel stuff is it has a nice per character
> ruler at the top of the window.
>
> I wonder if you have a different tab indent size?  The kernel uses 8
> characters.  It might explain the few other odd indents if perhaps
> you have it at 4 in your editor?
>
> https://www.kernel.org/doc/html/v4.10/process/coding-style.html
>

Got it. I was using tab=4. I will change to 8. Thanks!

> Jonathan
>
> >
> > > > +                      * initialized.
> > > > +                      */
> > > > +                     continue;
> > > > +
> > > >               memtier = set_node_memory_tier(node);
> > > >               if (IS_ERR(memtier))
> > > >                       /*
> > >
> >
> >
>


-- 
Best regards,
Ho-Ren (Jack) Chuang
莊賀任