* [PATCH] mm: ZONE_DEVICE depends on SPARSEMEM_VMEMMAP
@ 2016-03-05 0:42 ` Dan Williams
0 siblings, 0 replies; 4+ messages in thread
From: Dan Williams @ 2016-03-05 0:42 UTC (permalink / raw)
To: akpm; +Cc: linux-mm, linux-kernel, Vlastimil Babka
The primary use case for devm_memremap_pages() is to allocate an
memmap array from persistent memory. That capabilty requires
vmem_altmap which requires SPARSEMEM_VMEMMAP.
Also, without SPARSEMEM_VMEMMAP the addition of ZONE_DEVICE expands
ZONES_WIDTH and triggers the:
"Unfortunate NUMA and NUMA Balancing config, growing page-frame for
last_cpupid."
...warning in mm/memory.c. SPARSEMEM_VMEMMAP=n && ZONE_DEVICE=y is not
a configuration we should worry about supporting.
Reported-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
mm/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/mm/Kconfig b/mm/Kconfig
index 664fa2416909..b95322ba542b 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -654,6 +654,7 @@ config ZONE_DEVICE
bool "Device memory (pmem, etc...) hotplug support" if EXPERT
depends on MEMORY_HOTPLUG
depends on MEMORY_HOTREMOVE
+ depends on SPARSEMEM_VMEMMAP
depends on X86_64 #arch_add_memory() comprehends device memory
help
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH] mm: ZONE_DEVICE depends on SPARSEMEM_VMEMMAP
@ 2016-03-05 0:42 ` Dan Williams
0 siblings, 0 replies; 4+ messages in thread
From: Dan Williams @ 2016-03-05 0:42 UTC (permalink / raw)
To: akpm; +Cc: linux-mm, linux-kernel, Vlastimil Babka
The primary use case for devm_memremap_pages() is to allocate an
memmap array from persistent memory. That capabilty requires
vmem_altmap which requires SPARSEMEM_VMEMMAP.
Also, without SPARSEMEM_VMEMMAP the addition of ZONE_DEVICE expands
ZONES_WIDTH and triggers the:
"Unfortunate NUMA and NUMA Balancing config, growing page-frame for
last_cpupid."
...warning in mm/memory.c. SPARSEMEM_VMEMMAP=n && ZONE_DEVICE=y is not
a configuration we should worry about supporting.
Reported-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
mm/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/mm/Kconfig b/mm/Kconfig
index 664fa2416909..b95322ba542b 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -654,6 +654,7 @@ config ZONE_DEVICE
bool "Device memory (pmem, etc...) hotplug support" if EXPERT
depends on MEMORY_HOTPLUG
depends on MEMORY_HOTREMOVE
+ depends on SPARSEMEM_VMEMMAP
depends on X86_64 #arch_add_memory() comprehends device memory
help
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^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] mm: ZONE_DEVICE depends on SPARSEMEM_VMEMMAP
2016-03-05 0:42 ` Dan Williams
@ 2016-03-07 9:53 ` Vlastimil Babka
-1 siblings, 0 replies; 4+ messages in thread
From: Vlastimil Babka @ 2016-03-07 9:53 UTC (permalink / raw)
To: Dan Williams, akpm; +Cc: linux-mm, linux-kernel
On 03/05/2016 01:42 AM, Dan Williams wrote:
> The primary use case for devm_memremap_pages() is to allocate an
> memmap array from persistent memory. That capabilty requires
> vmem_altmap which requires SPARSEMEM_VMEMMAP.
Some if the ifdefs around to_vmem_altmap() could now be simplified, but
that can also be done later...
> Also, without SPARSEMEM_VMEMMAP the addition of ZONE_DEVICE expands
> ZONES_WIDTH and triggers the:
>
> "Unfortunate NUMA and NUMA Balancing config, growing page-frame for
> last_cpupid."
>
> ...warning in mm/memory.c. SPARSEMEM_VMEMMAP=n && ZONE_DEVICE=y is not
> a configuration we should worry about supporting.
>
> Reported-by: Vlastimil Babka <vbabka@suse.cz>
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
> ---
> mm/Kconfig | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/mm/Kconfig b/mm/Kconfig
> index 664fa2416909..b95322ba542b 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -654,6 +654,7 @@ config ZONE_DEVICE
> bool "Device memory (pmem, etc...) hotplug support" if EXPERT
> depends on MEMORY_HOTPLUG
> depends on MEMORY_HOTREMOVE
> + depends on SPARSEMEM_VMEMMAP
> depends on X86_64 #arch_add_memory() comprehends device memory
>
> help
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] mm: ZONE_DEVICE depends on SPARSEMEM_VMEMMAP
@ 2016-03-07 9:53 ` Vlastimil Babka
0 siblings, 0 replies; 4+ messages in thread
From: Vlastimil Babka @ 2016-03-07 9:53 UTC (permalink / raw)
To: Dan Williams, akpm; +Cc: linux-mm, linux-kernel
On 03/05/2016 01:42 AM, Dan Williams wrote:
> The primary use case for devm_memremap_pages() is to allocate an
> memmap array from persistent memory. That capabilty requires
> vmem_altmap which requires SPARSEMEM_VMEMMAP.
Some if the ifdefs around to_vmem_altmap() could now be simplified, but
that can also be done later...
> Also, without SPARSEMEM_VMEMMAP the addition of ZONE_DEVICE expands
> ZONES_WIDTH and triggers the:
>
> "Unfortunate NUMA and NUMA Balancing config, growing page-frame for
> last_cpupid."
>
> ...warning in mm/memory.c. SPARSEMEM_VMEMMAP=n && ZONE_DEVICE=y is not
> a configuration we should worry about supporting.
>
> Reported-by: Vlastimil Babka <vbabka@suse.cz>
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
> ---
> mm/Kconfig | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/mm/Kconfig b/mm/Kconfig
> index 664fa2416909..b95322ba542b 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -654,6 +654,7 @@ config ZONE_DEVICE
> bool "Device memory (pmem, etc...) hotplug support" if EXPERT
> depends on MEMORY_HOTPLUG
> depends on MEMORY_HOTREMOVE
> + depends on SPARSEMEM_VMEMMAP
> depends on X86_64 #arch_add_memory() comprehends device memory
>
> help
>
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^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2016-03-07 9:53 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2016-03-05 0:42 [PATCH] mm: ZONE_DEVICE depends on SPARSEMEM_VMEMMAP Dan Williams
2016-03-05 0:42 ` Dan Williams
2016-03-07 9:53 ` Vlastimil Babka
2016-03-07 9:53 ` Vlastimil Babka
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