* [PATCH] mm, page_alloc: really disable DEBUG_PAGEALLOC with hibernation
@ 2021-05-19 15:28 Krzysztof Kozlowski
2021-05-19 15:30 ` David Hildenbrand
2021-05-19 15:38 ` Vlastimil Babka
0 siblings, 2 replies; 7+ messages in thread
From: Krzysztof Kozlowski @ 2021-05-19 15:28 UTC (permalink / raw)
To: Andrew Morton, Akinobu Mita, linux-mm, linux-kernel
Cc: Vlastimil Babka, David Hildenbrand, Michal Hocko,
Rafael J . Wysocki, Andrea Righi, Guilherme Piccoli,
Krzysztof Kozlowski
The documentation of DEBUG_PAGEALLOC states that it cannot be used with
hibernation, however the Kconfig entry would allow it if
ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC.
Fixes: ee3b4290aec0 ("generic debug pagealloc: build fix")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
mm/Kconfig.debug | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
index 1e73717802f8..0ace5b2a9d04 100644
--- a/mm/Kconfig.debug
+++ b/mm/Kconfig.debug
@@ -11,7 +11,7 @@ config PAGE_EXTENSION
config DEBUG_PAGEALLOC
bool "Debug page memory allocations"
depends on DEBUG_KERNEL
- depends on !HIBERNATION || ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
+ depends on !HIBERNATION && ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC
help
Unmap pages from the kernel linear mapping after free_pages().
--
2.27.0
^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH] mm, page_alloc: really disable DEBUG_PAGEALLOC with hibernation
2021-05-19 15:28 [PATCH] mm, page_alloc: really disable DEBUG_PAGEALLOC with hibernation Krzysztof Kozlowski
@ 2021-05-19 15:30 ` David Hildenbrand
2021-05-19 15:42 ` Krzysztof Kozlowski
2021-05-19 15:48 ` Vlastimil Babka
2021-05-19 15:38 ` Vlastimil Babka
1 sibling, 2 replies; 7+ messages in thread
From: David Hildenbrand @ 2021-05-19 15:30 UTC (permalink / raw)
To: Krzysztof Kozlowski, Andrew Morton, Akinobu Mita, linux-mm, linux-kernel
Cc: Vlastimil Babka, Michal Hocko, Rafael J . Wysocki, Andrea Righi,
Guilherme Piccoli
On 19.05.21 17:28, Krzysztof Kozlowski wrote:
> The documentation of DEBUG_PAGEALLOC states that it cannot be used with
> hibernation, however the Kconfig entry would allow it if
> ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC.
>
> Fixes: ee3b4290aec0 ("generic debug pagealloc: build fix")
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
> ---
> mm/Kconfig.debug | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
> index 1e73717802f8..0ace5b2a9d04 100644
> --- a/mm/Kconfig.debug
> +++ b/mm/Kconfig.debug
> @@ -11,7 +11,7 @@ config PAGE_EXTENSION
> config DEBUG_PAGEALLOC
> bool "Debug page memory allocations"
> depends on DEBUG_KERNEL
> - depends on !HIBERNATION || ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
> + depends on !HIBERNATION && ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
> select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC
> help
> Unmap pages from the kernel linear mapping after free_pages().
>
I remember this should be working now, as we temporarily map the pages
in the direct map when hibernating?
--
Thanks,
David / dhildenb
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] mm, page_alloc: really disable DEBUG_PAGEALLOC with hibernation
2021-05-19 15:28 [PATCH] mm, page_alloc: really disable DEBUG_PAGEALLOC with hibernation Krzysztof Kozlowski
2021-05-19 15:30 ` David Hildenbrand
@ 2021-05-19 15:38 ` Vlastimil Babka
2021-05-19 15:43 ` Krzysztof Kozlowski
1 sibling, 1 reply; 7+ messages in thread
From: Vlastimil Babka @ 2021-05-19 15:38 UTC (permalink / raw)
To: Krzysztof Kozlowski, Andrew Morton, Akinobu Mita, linux-mm, linux-kernel
Cc: David Hildenbrand, Michal Hocko, Rafael J . Wysocki,
Andrea Righi, Guilherme Piccoli
On 5/19/21 5:28 PM, Krzysztof Kozlowski wrote:
> The documentation of DEBUG_PAGEALLOC states that it cannot be used with
> hibernation, however the Kconfig entry would allow it if
> ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC.
>
> Fixes: ee3b4290aec0 ("generic debug pagealloc: build fix")
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Hmm the documentation seems wrong, as going through history it was indeed in
conflict only on PPC and SPARC.
> ---
> mm/Kconfig.debug | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
> index 1e73717802f8..0ace5b2a9d04 100644
> --- a/mm/Kconfig.debug
> +++ b/mm/Kconfig.debug
> @@ -11,7 +11,7 @@ config PAGE_EXTENSION
> config DEBUG_PAGEALLOC
> bool "Debug page memory allocations"
> depends on DEBUG_KERNEL
> - depends on !HIBERNATION || ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
> + depends on !HIBERNATION && ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
> select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC
> help
> Unmap pages from the kernel linear mapping after free_pages().
>
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] mm, page_alloc: really disable DEBUG_PAGEALLOC with hibernation
2021-05-19 15:30 ` David Hildenbrand
@ 2021-05-19 15:42 ` Krzysztof Kozlowski
2021-05-19 15:48 ` Vlastimil Babka
1 sibling, 0 replies; 7+ messages in thread
From: Krzysztof Kozlowski @ 2021-05-19 15:42 UTC (permalink / raw)
To: David Hildenbrand, Andrew Morton, Akinobu Mita, linux-mm, linux-kernel
Cc: Vlastimil Babka, Michal Hocko, Rafael J . Wysocki, Andrea Righi,
Guilherme Piccoli
On 19/05/2021 11:30, David Hildenbrand wrote:
> On 19.05.21 17:28, Krzysztof Kozlowski wrote:
>> The documentation of DEBUG_PAGEALLOC states that it cannot be used with
>> hibernation, however the Kconfig entry would allow it if
>> ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC.
>>
>> Fixes: ee3b4290aec0 ("generic debug pagealloc: build fix")
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
>> ---
>> mm/Kconfig.debug | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
>> index 1e73717802f8..0ace5b2a9d04 100644
>> --- a/mm/Kconfig.debug
>> +++ b/mm/Kconfig.debug
>> @@ -11,7 +11,7 @@ config PAGE_EXTENSION
>> config DEBUG_PAGEALLOC
>> bool "Debug page memory allocations"
>> depends on DEBUG_KERNEL
>> - depends on !HIBERNATION || ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
>> + depends on !HIBERNATION && ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
>> select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC
>> help
>> Unmap pages from the kernel linear mapping after free_pages().
>>
>
> I remember this should be working now, as we temporarily map the pages
> in the direct map when hibernating?
Let me actually test it on x86_64...
Best regards,
Krzysztof
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] mm, page_alloc: really disable DEBUG_PAGEALLOC with hibernation
2021-05-19 15:38 ` Vlastimil Babka
@ 2021-05-19 15:43 ` Krzysztof Kozlowski
0 siblings, 0 replies; 7+ messages in thread
From: Krzysztof Kozlowski @ 2021-05-19 15:43 UTC (permalink / raw)
To: Vlastimil Babka, Andrew Morton, Akinobu Mita, linux-mm, linux-kernel
Cc: David Hildenbrand, Michal Hocko, Rafael J . Wysocki,
Andrea Righi, Guilherme Piccoli
On 19/05/2021 11:38, Vlastimil Babka wrote:
> On 5/19/21 5:28 PM, Krzysztof Kozlowski wrote:
>> The documentation of DEBUG_PAGEALLOC states that it cannot be used with
>> hibernation, however the Kconfig entry would allow it if
>> ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC.
>>
>> Fixes: ee3b4290aec0 ("generic debug pagealloc: build fix")
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
>
> Hmm the documentation seems wrong, as going through history it was indeed in
> conflict only on PPC and SPARC.
Indeed, x86 was never marked as a problem, although text/info warning
does not mention specific architectures.
>
Best regards,
Krzysztof
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] mm, page_alloc: really disable DEBUG_PAGEALLOC with hibernation
2021-05-19 15:30 ` David Hildenbrand
2021-05-19 15:42 ` Krzysztof Kozlowski
@ 2021-05-19 15:48 ` Vlastimil Babka
2021-05-19 17:57 ` Krzysztof Kozlowski
1 sibling, 1 reply; 7+ messages in thread
From: Vlastimil Babka @ 2021-05-19 15:48 UTC (permalink / raw)
To: David Hildenbrand, Krzysztof Kozlowski, Andrew Morton,
Akinobu Mita, linux-mm, linux-kernel
Cc: Michal Hocko, Rafael J . Wysocki, Andrea Righi, Guilherme Piccoli
On 5/19/21 5:30 PM, David Hildenbrand wrote:
> On 19.05.21 17:28, Krzysztof Kozlowski wrote:
>> The documentation of DEBUG_PAGEALLOC states that it cannot be used with
>> hibernation, however the Kconfig entry would allow it if
>> ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC.
>>
>> Fixes: ee3b4290aec0 ("generic debug pagealloc: build fix")
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
>> ---
>> mm/Kconfig.debug | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
>> index 1e73717802f8..0ace5b2a9d04 100644
>> --- a/mm/Kconfig.debug
>> +++ b/mm/Kconfig.debug
>> @@ -11,7 +11,7 @@ config PAGE_EXTENSION
>> config DEBUG_PAGEALLOC
>> bool "Debug page memory allocations"
>> depends on DEBUG_KERNEL
>> - depends on !HIBERNATION || ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
>> + depends on !HIBERNATION && ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
>> select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC
>> help
>> Unmap pages from the kernel linear mapping after free_pages().
>>
>
> I remember this should be working now, as we temporarily map the pages in the
> direct map when hibernating?
Yeah, and if the problem was the page poisoning based implementation/fallback,
that was also fixed.
The current dependencies come from the unification by ee3b4290aec03
The question is if PPC and SPARC still really need to disable hibernation.
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] mm, page_alloc: really disable DEBUG_PAGEALLOC with hibernation
2021-05-19 15:48 ` Vlastimil Babka
@ 2021-05-19 17:57 ` Krzysztof Kozlowski
0 siblings, 0 replies; 7+ messages in thread
From: Krzysztof Kozlowski @ 2021-05-19 17:57 UTC (permalink / raw)
To: Vlastimil Babka, David Hildenbrand, Andrew Morton, Akinobu Mita,
linux-mm, linux-kernel
Cc: Michal Hocko, Rafael J . Wysocki, Andrea Righi, Guilherme Piccoli
On 19/05/2021 11:48, Vlastimil Babka wrote:
> On 5/19/21 5:30 PM, David Hildenbrand wrote:
>> On 19.05.21 17:28, Krzysztof Kozlowski wrote:
>>> The documentation of DEBUG_PAGEALLOC states that it cannot be used with
>>> hibernation, however the Kconfig entry would allow it if
>>> ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC.
>>>
>>> Fixes: ee3b4290aec0 ("generic debug pagealloc: build fix")
>>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
>>> ---
>>> mm/Kconfig.debug | 2 +-
>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
>>> index 1e73717802f8..0ace5b2a9d04 100644
>>> --- a/mm/Kconfig.debug
>>> +++ b/mm/Kconfig.debug
>>> @@ -11,7 +11,7 @@ config PAGE_EXTENSION
>>> config DEBUG_PAGEALLOC
>>> bool "Debug page memory allocations"
>>> depends on DEBUG_KERNEL
>>> - depends on !HIBERNATION || ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
>>> + depends on !HIBERNATION && ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
>>> select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC
>>> help
>>> Unmap pages from the kernel linear mapping after free_pages().
>>>
>>
>> I remember this should be working now, as we temporarily map the pages in the
>> direct map when hibernating?
>
> Yeah, and if the problem was the page poisoning based implementation/fallback,
> that was also fixed.
>
> The current dependencies come from the unification by ee3b4290aec03
>
> The question is if PPC and SPARC still really need to disable hibernation.
I tested slightly older kernel (v5.8 with few backports for poison
support with hibernation) and it worked fine on x86_64. For the PPC and
SPARC I don't know.
I can update the Kconfig option description to mention x86_64.
Best regards,
Krzysztof
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2021-05-19 17:57 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
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2021-05-19 15:28 [PATCH] mm, page_alloc: really disable DEBUG_PAGEALLOC with hibernation Krzysztof Kozlowski
2021-05-19 15:30 ` David Hildenbrand
2021-05-19 15:42 ` Krzysztof Kozlowski
2021-05-19 15:48 ` Vlastimil Babka
2021-05-19 17:57 ` Krzysztof Kozlowski
2021-05-19 15:38 ` Vlastimil Babka
2021-05-19 15:43 ` Krzysztof Kozlowski
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