From: Oscar Salvador <osalvador@suse.de>
To: David Hildenbrand <david@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Michal Hocko <mhocko@kernel.org>,
VlastimilBabkavbabka@suse.cz, pasha.tatashin@soleen.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Anshuman Khandual <anshuman.khandual@arm.com>
Subject: Re: [PATCH v2 6/7] x86/Kconfig: Introduce ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
Date: Fri, 26 Feb 2021 13:04:51 +0100 [thread overview]
Message-ID: <20210226120451.GA3661@localhost.localdomain> (raw)
In-Reply-To: <dc044ae2-efce-0639-87de-3a3167c07a06@redhat.com>
On Thu, Feb 25, 2021 at 07:29:07PM +0100, David Hildenbrand wrote:
> On 09.02.21 14:38, Oscar Salvador wrote:
> > Enable x86_64 platform to use the MHP_MEMMAP_ON_MEMORY feature.
> >
> > Signed-off-by: Oscar Salvador <osalvador@suse.de>
> > ---
> > arch/x86/Kconfig | 4 ++++
> > 1 file changed, 4 insertions(+)
> >
> > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> > index 72663de8b04c..81046b7adb10 100644
> > --- a/arch/x86/Kconfig
> > +++ b/arch/x86/Kconfig
> > @@ -2440,6 +2440,10 @@ config ARCH_ENABLE_MEMORY_HOTREMOVE
> > def_bool y
> > depends on MEMORY_HOTPLUG
> > +config ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
> > + def_bool y
> > + depends on X86_64 && MEMORY_HOTPLUG && SPARSEMEM_VMEMMAP_ENABLE
>
> It depends on SPARSEMEM_VMEMMAP, no?
>
> I think we could have
>
> SPARSEMEM_VMEMMAP_ENABLE=y
> and
> SPARSEMEM_VMEMMAP=n
>
> on manually tuned configs.
I do not think this can happen:
from mm/Kconfig:
config SPARSEMEM_VMEMMAP_ENABLE
bool
config SPARSEMEM_VMEMMAP
bool "Sparse Memory virtual memmap"
depends on SPARSEMEM && SPARSEMEM_VMEMMAP_ENABLE
default y
help
SPARSEMEM_VMEMMAP uses a virtually mapped memmap to optimise
pfn_to_page and page_to_pfn operations. This is the most
efficient option when sufficient kernel resources are available
and from arch/x86/Kconfig:
config ARCH_SPARSEMEM_ENABLE
def_bool y
depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD
select SPARSEMEM_STATIC if X86_32
select SPARSEMEM_VMEMMAP_ENABLE if X86_64
So, if I read this correctly, for SPARSEMEM_VMEMMAP to be true,
SPARSEMEM_VMEMMAP_ENABLE needs to be true as well.
Am I missing something?
--
Oscar Salvador
SUSE L3
next prev parent reply other threads:[~2021-02-26 12:05 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-09 13:38 [PATCH v2 0/7] Allocate memmap from hotadded memory (per device) Oscar Salvador
2021-02-09 13:38 ` [PATCH v2 1/7] mm,memory_hotplug: Allocate memmap from the added memory range Oscar Salvador
2021-02-25 18:58 ` David Hildenbrand
2021-02-28 18:50 ` Oscar Salvador
2021-03-01 8:30 ` David Hildenbrand
2021-03-01 8:32 ` David Hildenbrand
2021-02-09 13:38 ` [PATCH v2 2/7] acpi,memhotplug: Enable MHP_MEMMAP_ON_MEMORY when supported Oscar Salvador
2021-02-09 13:38 ` [PATCH v2 3/7] mm,memory_hotplug: Add kernel boot option to enable memmap_on_memory Oscar Salvador
2021-02-25 18:25 ` David Hildenbrand
2021-02-26 12:14 ` Oscar Salvador
2021-03-01 8:27 ` David Hildenbrand
2021-02-09 13:38 ` [PATCH v2 4/7] mm,memory_hotplug: Enforce struct page size to be multiple of PMD Oscar Salvador
2021-02-25 18:26 ` David Hildenbrand
2021-02-26 12:06 ` Oscar Salvador
2021-03-01 10:06 ` Oscar Salvador
2021-03-01 10:24 ` David Hildenbrand
2021-02-09 13:38 ` [PATCH v2 5/7] mm,memory_hotplug: Enforce pageblock alignment when memmap_on_memory Oscar Salvador
2021-02-25 18:27 ` David Hildenbrand
2021-02-26 12:06 ` Oscar Salvador
2021-02-09 13:38 ` [PATCH v2 6/7] x86/Kconfig: Introduce ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE Oscar Salvador
2021-02-25 18:29 ` David Hildenbrand
2021-02-26 12:04 ` Oscar Salvador [this message]
2021-03-01 8:45 ` David Hildenbrand
2021-03-01 10:07 ` Oscar Salvador
2021-02-09 13:38 ` [PATCH v2 7/7] arm64/Kconfig: " Oscar Salvador
2021-02-25 18:29 ` David Hildenbrand
2021-02-26 12:10 ` Oscar Salvador
2021-02-17 10:18 ` [PATCH v2 0/7] Allocate memmap from hotadded memory (per device) Oscar Salvador
2021-02-22 11:15 ` Oscar Salvador
2021-02-22 11:28 ` David Hildenbrand
2021-02-23 7:48 ` Oscar Salvador
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