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From: Dan Williams <dan.j.williams@intel.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Andy Lutomirski <luto@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Borislav Petkov <bp@alien8.de>, "H. Peter Anvin" <hpa@zytor.com>,
	X86 ML <x86@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	David Hildenbrand <david@redhat.com>,
	Michal Hocko <mhocko@suse.com>, Christoph Hellwig <hch@lst.de>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-nvdimm <linux-nvdimm@lists.01.org>
Subject: Re: [PATCH v4 4/6] x86/mm: Introduce CONFIG_KEEP_NUMA
Date: Thu, 13 Feb 2020 13:19:51 -0800
Message-ID: <CAPcyv4hXpqrZ4jmgmjy9fH=3oHg0UDDU6xLGX2TVCgSS_xkq4w@mail.gmail.com> (raw)
In-Reply-To: <20200213093227.GA90266@gmail.com>

On Thu, Feb 13, 2020 at 1:32 AM Ingo Molnar <mingo@kernel.org> wrote:
>
>
> * Dan Williams <dan.j.williams@intel.com> wrote:
>
> > Currently x86 numa_meminfo is marked __initdata in the
> > CONFIG_MEMORY_HOTPLUG=n case. In support of a new facility to allow
> > drivers to map reserved memory to a 'target_node'
> > (phys_to_target_node()), add support for removing the __initdata
> > designation for those users. Both memory hotplug and
> > phys_to_target_node() users select CONFIG_KEEP_NUMA to tell the arch to
> > maintain its physical address to numa mapping infrastructure post init.
> >
> > Cc: Dave Hansen <dave.hansen@linux.intel.com>
> > Cc: Andy Lutomirski <luto@kernel.org>
> > Cc: Peter Zijlstra <peterz@infradead.org>
> > Cc: Thomas Gleixner <tglx@linutronix.de>
> > Cc: Ingo Molnar <mingo@redhat.com>
> > Cc: Borislav Petkov <bp@alien8.de>
> > Cc: "H. Peter Anvin" <hpa@zytor.com>
> > Cc: <x86@kernel.org>
> > Cc: Andrew Morton <akpm@linux-foundation.org>
> > Cc: David Hildenbrand <david@redhat.com>
> > Cc: Michal Hocko <mhocko@suse.com>
> > Signed-off-by: Dan Williams <dan.j.williams@intel.com>
> > ---
> >  arch/x86/mm/numa.c   |    6 +-----
> >  include/linux/numa.h |    6 ++++++
> >  mm/Kconfig           |    5 +++++
> >  3 files changed, 12 insertions(+), 5 deletions(-)
>
> The concept and the x86 portions look sane, just a few minor nits:
>
> >
> > diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
> > index 99f7a68738f0..5289d9d6799a 100644
> > --- a/arch/x86/mm/numa.c
> > +++ b/arch/x86/mm/numa.c
> > @@ -25,11 +25,7 @@ nodemask_t numa_nodes_parsed __initdata;
> >  struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
> >  EXPORT_SYMBOL(node_data);
> >
> > -static struct numa_meminfo numa_meminfo
> > -#ifndef CONFIG_MEMORY_HOTPLUG
> > -__initdata
> > -#endif
> > -;
> > +static struct numa_meminfo numa_meminfo __initdata_numa;
> >
> >  static int numa_distance_cnt;
> >  static u8 *numa_distance;
> > diff --git a/include/linux/numa.h b/include/linux/numa.h
> > index 20f4e44b186c..c005ed6b807b 100644
> > --- a/include/linux/numa.h
> > +++ b/include/linux/numa.h
> > @@ -13,6 +13,12 @@
> >
> >  #define      NUMA_NO_NODE    (-1)
> >
> > +#ifdef CONFIG_KEEP_NUMA
> > +#define __initdata_numa
> > +#else
> > +#define __initdata_numa __initdata
> > +#endif
> > +
> >  #ifdef CONFIG_NUMA
> >  int numa_map_to_online_node(int node);
> >  #else
> > diff --git a/mm/Kconfig b/mm/Kconfig
> > index ab80933be65f..001f1185eadf 100644
> > --- a/mm/Kconfig
> > +++ b/mm/Kconfig
> > @@ -139,6 +139,10 @@ config HAVE_FAST_GUP
> >  config ARCH_KEEP_MEMBLOCK
> >       bool
> >
> > +# Keep arch numa mapping infrastructure post-init.
>
> s/numa/NUMA
>
> Please also capitalize consistently in the rest of the series.
>
> > +config KEEP_NUMA
> > +     bool
>
>
> So most of our recent new NUMA options followed the naming pattern of:
>
>   CONFIG_NUMA_*
>
> Such as CONFIG_NUMA_BALANCING or CONFIG_NUMA_EMU.
>
> So I'd suggesting naming it to CONFIG_NUMA_KEEP, or, a bit more
> descriptively, such as CONFIG_NUMA_KEEP_MAPPING or such?
>
> 'Keeping NUMA' is kind of lame - of course we keep NUMA. ;-)

Ok, I settled on CONFIG_NUMA_KEEP_MEMINFO, and will fix up the
lowercase "numa" instances in the set.
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  reply index

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-22  3:04 [PATCH v4 0/6] Memory Hierarchy: Enable target node lookups for reserved memory Dan Williams
2020-01-22  3:04 ` [PATCH v4 1/6] ACPI: NUMA: Up-level "map to online node" functionality Dan Williams
2020-01-22  3:04 ` [PATCH v4 2/6] mm/numa: Skip NUMA_NO_NODE and online nodes in numa_map_to_online_node() Dan Williams
2020-01-22  3:04 ` [PATCH v4 3/6] powerpc/papr_scm: Switch to numa_map_to_online_node() Dan Williams
2020-01-22  3:04 ` [PATCH v4 4/6] x86/mm: Introduce CONFIG_KEEP_NUMA Dan Williams
2020-02-13  9:32   ` Ingo Molnar
2020-02-13 21:19     ` Dan Williams [this message]
2020-02-13 11:22   ` Thomas Gleixner
2020-02-13 21:21     ` Dan Williams
2020-01-22  3:05 ` [PATCH v4 5/6] x86/numa: Provide a range-to-target_node lookup facility Dan Williams
2020-02-13  9:36   ` Ingo Molnar
2020-02-13 11:37   ` Thomas Gleixner
2020-02-13 21:40     ` Dan Williams
2020-01-22  3:05 ` [PATCH v4 6/6] libnvdimm/e820: Retrieve and populate correct 'target_node' info Dan Williams
2020-02-13  2:28 ` [PATCH v4 0/6] Memory Hierarchy: Enable target node lookups for reserved memory Dan Williams
2020-02-13  9:37   ` Ingo Molnar
2020-02-16 20:00 ` [PATCH v5 " Dan Williams
2020-02-16 20:00   ` [PATCH v5 1/6] ACPI: NUMA: Up-level "map to online node" functionality Dan Williams
2020-02-16 20:00   ` [PATCH v5 2/6] mm/numa: Skip NUMA_NO_NODE and online nodes in numa_map_to_online_node() Dan Williams
2020-02-16 20:00   ` [PATCH v5 3/6] powerpc/papr_scm: Switch to numa_map_to_online_node() Dan Williams
2020-02-16 20:01   ` [PATCH v5 4/6] x86/mm: Introduce CONFIG_NUMA_KEEP_MEMINFO Dan Williams
2020-02-17  8:21     ` Thomas Gleixner
2020-02-16 20:01   ` [PATCH v5 5/6] x86/NUMA: Provide a range-to-target_node lookup facility Dan Williams
2020-02-17  8:22     ` Thomas Gleixner
2020-02-16 20:01   ` [PATCH v5 6/6] libnvdimm/e820: Retrieve and populate correct 'target_node' info Dan Williams

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