linux-kernel - Re: [tip:x86/urgent] arch/x86/mm/srat: Skip NUMA_NO

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Date:	Sun, 26 Jan 2014 09:46:04 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Toshi Kani <toshi.kani@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	David Rientjes <rientjes@...gle.com>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>
Subject: Re: [tip:x86/urgent] arch/x86/mm/srat: Skip NUMA_NO_NODE while
 parsing SLIT


* Yinghai Lu <yinghai@...nel.org> wrote:

> On Sat, Jan 25, 2014 at 6:25 AM, tip-bot for Toshi Kani
> <tipbot@...or.com> wrote:
> > Commit-ID:  a85eba8814631d0d48361c8b9a7ee0984e80c03c
> > Gitweb:     http://git.kernel.org/tip/a85eba8814631d0d48361c8b9a7ee0984e80c03c
> > Author:     Toshi Kani <toshi.kani@...com>
> > AuthorDate: Tue, 21 Jan 2014 14:33:15 -0800
> > Committer:  Ingo Molnar <mingo@...nel.org>
> > CommitDate: Sat, 25 Jan 2014 09:13:35 +0100
> >
> > arch/x86/mm/srat: Skip NUMA_NO_NODE while parsing SLIT
> >
> > When ACPI SLIT table has an I/O locality (i.e. a locality
> > unique to an I/O device), numa_set_distance() emits this warning
> > message:
> >
> >  NUMA: Warning: node ids are out of bound, from=-1 to=-1 distance=10
> >
> > acpi_numa_slit_init() calls numa_set_distance() with
> > pxm_to_node(), which assumes that all localities have been
> > parsed with SRAT previously.  SRAT does not list I/O localities,
> > where as SLIT lists all localities including I/Os.  Hence,
> > pxm_to_node() returns NUMA_NO_NODE (-1) for an I/O locality.
> >
> > I/O localities are not supported and are ignored today, but emitting
> > such warning message leads to unnecessary confusion.
> >
> > Change acpi_numa_slit_init() to avoid calling
> > numa_set_distance() with NUMA_NO_NODE.
> >
> > Signed-off-by: Toshi Kani <toshi.kani@...com>
> > Acked-by: David Rientjes <rientjes@...gle.com>
> > Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> > Cc: Yinghai Lu <yinghai@...nel.org>
> > Link: http://lkml.kernel.org/n/tip-dSvpjjvp8aMzs1ybkftxohlh@git.kernel.org
> > Signed-off-by: Ingo Molnar <mingo@...nel.org>
> > ---
> >  arch/x86/mm/srat.c | 16 +++++++++++++---
> >  1 file changed, 13 insertions(+), 3 deletions(-)
> >
> > diff --git a/arch/x86/mm/srat.c b/arch/x86/mm/srat.c
> > index 266ca91..5ecf651 100644
> > --- a/arch/x86/mm/srat.c
> > +++ b/arch/x86/mm/srat.c
> > @@ -42,15 +42,25 @@ static __init inline int srat_disabled(void)
> >         return acpi_numa < 0;
> >  }
> >
> > -/* Callback for SLIT parsing */
> > +/*
> > + * Callback for SLIT parsing.  pxm_to_node() returns NUMA_NO_NODE for
> > + * I/O localities since SRAT does not list them.  I/O localities are
> > + * not supported at this point.
> > + */
> >  void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
> >  {
> >         int i, j;
> >
> > -       for (i = 0; i < slit->locality_count; i++)
> > -               for (j = 0; j < slit->locality_count; j++)
> > +       for (i = 0; i < slit->locality_count; i++) {
> > +               if (pxm_to_node(i) == NUMA_NO_NODE)
> > +                       continue;
> > +               for (j = 0; j < slit->locality_count; j++) {
> > +                       if (pxm_to_node(j) == NUMA_NO_NODE)
> > +                               continue;
> >                         numa_set_distance(pxm_to_node(i), pxm_to_node(j),
> >                                 slit->entry[slit->locality_count * i + j]);
> > +               }
> > +       }
> >  }
> >
> >  /* Callback for Proximity Domain -> x2APIC mapping */
> 
> wonder if the patch that i sent one year ago is better.
>
> https://lkml.org/lkml/2013/1/21/559
> 
> as it avoid calling extra calling of pxm_to_node(i).

If it's "better" in the sense of being faster (and is otherwise 
equivalent functionally - assuming the original patch is bug free) 
then please submit it as a delta patch. (I assume the one you sent 
here wasn't.)

Thanks,

	Ingo
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