On 02/12/2020 11:25 PM, Gerald Schaefer wrote:
> On Wed, 12 Feb 2020 15:12:54 +0530
> Anshuman Khandual wrote:
>
+/*
+ * On s390 platform, the lower 12 bits are used to identify given page
table
+ * entry type and for other arch specific requirements. But these bits
On Wed, 12 Feb 2020 15:12:54 +0530
Anshuman Khandual wrote:
> >> +/*
> >> + * On s390 platform, the lower 12 bits are used to identify given page
> >> table
> >> + * entry type and for other arch specific requirements. But these bits
> >> might
> >> + * affect the ability to clear entries with
On 02/10/2020 09:07 PM, Catalin Marinas wrote:
> On Tue, Jan 28, 2020 at 06:57:53AM +0530, Anshuman Khandual wrote:
>> This gets build and run when CONFIG_DEBUG_VM_PGTABLE is selected along with
>> CONFIG_VM_DEBUG. Architectures willing to subscribe this test also need to
>> select
On Tue, Jan 28, 2020 at 06:57:53AM +0530, Anshuman Khandual wrote:
> This gets build and run when CONFIG_DEBUG_VM_PGTABLE is selected along with
> CONFIG_VM_DEBUG. Architectures willing to subscribe this test also need to
> select CONFIG_ARCH_HAS_DEBUG_VM_PGTABLE which for now is limited to x86
On Mon, 2020-02-03 at 16:14 +0100, Christophe Leroy wrote:
>
> Le 02/02/2020 à 12:26, Qian Cai a écrit :
> >
> >
> > > On Jan 30, 2020, at 9:13 AM, Christophe Leroy
> > > wrote:
> > >
> > > config DEBUG_VM_PGTABLE
> > > bool "Debug arch page table for semantics compliance" if
> > >
Le 02/02/2020 à 12:26, Qian Cai a écrit :
On Jan 30, 2020, at 9:13 AM, Christophe Leroy wrote:
config DEBUG_VM_PGTABLE
bool "Debug arch page table for semantics compliance" if
ARCH_HAS_DEBUG_VM_PGTABLE || EXPERT
depends on MMU
default 'n' if !ARCH_HAS_DEBUG_VM_PGTABLE
> On Jan 30, 2020, at 9:13 AM, Christophe Leroy wrote:
>
> config DEBUG_VM_PGTABLE
>bool "Debug arch page table for semantics compliance" if
> ARCH_HAS_DEBUG_VM_PGTABLE || EXPERT
>depends on MMU
>default 'n' if !ARCH_HAS_DEBUG_VM_PGTABLE
>default 'y' if DEBUG_VM
Does it
Le 02/02/2020 à 08:18, Anshuman Khandual a écrit :
On 01/30/2020 07:43 PM, Christophe Leroy wrote:
Le 30/01/2020 à 14:04, Anshuman Khandual a écrit :
On 01/28/2020 10:35 PM, Christophe Leroy wrote:
I think we could make it standalone and 'default y if DEBUG_VM' instead.
Which will
On 01/30/2020 06:34 PM, Anshuman Khandual wrote:
> On 01/28/2020 10:35 PM, Christophe Leroy wrote:
>>
>> Le 28/01/2020 à 02:27, Anshuman Khandual a écrit :
>>> This adds tests which will validate architecture page table helpers and
>>> other accessors in their compliance with expected generic
On 01/30/2020 07:43 PM, Christophe Leroy wrote:
>
>
> Le 30/01/2020 à 14:04, Anshuman Khandual a écrit :
>>
>> On 01/28/2020 10:35 PM, Christophe Leroy wrote:
>>>
>>>
>>> Le 28/01/2020 à 02:27, Anshuman Khandual a écrit :
diff --git a/arch/x86/include/asm/pgtable_64.h
On 01/28/2020 06:57 AM, Anshuman Khandual wrote:
> This adds tests which will validate architecture page table helpers and
> other accessors in their compliance with expected generic MM semantics.
> This will help various architectures in validating changes to existing
> page table helpers or
Le 30/01/2020 à 14:04, Anshuman Khandual a écrit :
On 01/28/2020 10:35 PM, Christophe Leroy wrote:
Le 28/01/2020 à 02:27, Anshuman Khandual a écrit :
diff --git a/arch/x86/include/asm/pgtable_64.h
b/arch/x86/include/asm/pgtable_64.h
index 0b6c4042942a..fb0e76d254b3 100644
---
On 01/30/2020 12:57 PM, Mike Rapoport wrote:
> On Wed, Jan 29, 2020 at 11:20:44PM +0100, Gerald Schaefer wrote:
>> On Mon, 27 Jan 2020 22:33:08 -0500
>>
>> For example, who would have thought that pXd_bad() is supposed to
>> report large entries as bad? It's not really documented anywhere,
>
>
On 01/30/2020 03:50 AM, Gerald Schaefer wrote:
> On Tue, 28 Jan 2020 06:57:53 +0530
> Anshuman Khandual wrote:
>
>> This adds tests which will validate architecture page table helpers and
>> other accessors in their compliance with expected generic MM semantics.
>> This will help various
On 01/28/2020 10:35 PM, Christophe Leroy wrote:
>
>
> Le 28/01/2020 à 02:27, Anshuman Khandual a écrit :
>> This adds tests which will validate architecture page table helpers and
>> other accessors in their compliance with expected generic MM semantics.
>> This will help various architectures
On Wed, Jan 29, 2020 at 11:20:44PM +0100, Gerald Schaefer wrote:
> On Mon, 27 Jan 2020 22:33:08 -0500
>
> For example, who would have thought that pXd_bad() is supposed to
> report large entries as bad? It's not really documented anywhere,
A bit off-topic,
@Anshuman, maybe you could start a
On Mon, 27 Jan 2020 22:33:08 -0500
Qian Cai wrote:
> >
> >> Did those tests ever find any regression or this is almost only useful for
> >> new
> >
> > The test has already found problems with s390 page table helpers.
>
> Hmm, that is pretty weak where s390 is not even official supported
On Tue, 28 Jan 2020 06:57:53 +0530
Anshuman Khandual wrote:
> This adds tests which will validate architecture page table helpers and
> other accessors in their compliance with expected generic MM semantics.
> This will help various architectures in validating changes to existing
> page table
> On Jan 29, 2020, at 5:36 AM, Catalin Marinas wrote:
>
> On Tue, Jan 28, 2020 at 02:07:10PM -0500, Qian Cai wrote:
>> On Jan 28, 2020, at 12:47 PM, Catalin Marinas
>> wrote:
>>> The primary goal here is not finding regressions but having clearly
>>> defined semantics of the page table
On Tue, Jan 28, 2020 at 02:07:10PM -0500, Qian Cai wrote:
> On Jan 28, 2020, at 12:47 PM, Catalin Marinas wrote:
> > The primary goal here is not finding regressions but having clearly
> > defined semantics of the page table accessors across architectures. x86
> > and arm64 are a good starting
> On Jan 28, 2020, at 12:47 PM, Catalin Marinas wrote:
>
> The primary goal here is not finding regressions but having clearly
> defined semantics of the page table accessors across architectures. x86
> and arm64 are a good starting point and other architectures will be
> enabled as they are
On Mon, Jan 27, 2020 at 09:11:53PM -0500, Qian Cai wrote:
> On Jan 27, 2020, at 8:28 PM, Anshuman Khandual
> wrote:
> > This adds tests which will validate architecture page table helpers and
> > other accessors in their compliance with expected generic MM semantics.
> > This will help various
On 1/27/20 7:33 PM, Qian Cai wrote:
>
>>> What’s the value of this block of new code? It only supports x86 and arm64
>>> which are supposed to be good now.
>> We have been over the usefulness of this code many times before as the patch
>> is
>> already in it's V12. Currently it is enabled on
Le 28/01/2020 à 02:27, Anshuman Khandual a écrit :
This adds tests which will validate architecture page table helpers and
other accessors in their compliance with expected generic MM semantics.
This will help various architectures in validating changes to existing
page table helpers or
> On Jan 28, 2020, at 7:10 AM, Mike Rapoport wrote:
>
> Aren't x86 and arm64 not decent enough?
> Even if this test could be used to detect regressions only on these two
> platforms, the test is valuable.
The question is does it detect regressions good enough? Where is the list of
past bugs
Hello Qian,
On Mon, Jan 27, 2020 at 10:33:08PM -0500, Qian Cai wrote:
>
> > On Jan 27, 2020, at 10:06 PM, Anshuman Khandual
> > wrote:
> >
> > enablement of this test (for the moment) but then the goal is to integrate
> > all
> > of them going forward. The test not only validates platform's
On Tue, Jan 28, 2020 at 02:12:56AM -0500, Qian Cai wrote:
> > On Jan 28, 2020, at 1:13 AM, Christophe Leroy
> > wrote:
> > ppc32 an indecent / legacy platform ? Are you kidying ?
> > Powerquicc II PRO for instance is fully supported by the
> > manufacturer and widely used in many small
> On Jan 28, 2020, at 1:13 AM, Christophe Leroy wrote:
>
> ppc32 an indecent / legacy platform ? Are you kidying ?
>
> Powerquicc II PRO for instance is fully supported by the manufacturer and
> widely used in many small networking devices.
Of course I forgot about embedded devices. The
> On Jan 28, 2020, at 2:03 AM, Anshuman Khandual
> wrote:
>
> 'allyesconfig' makes 'DEBUG_VM = y' which in turn will enable
> 'DEBUG_VM_PGTABLE = y'
> on platforms that subscribe ARCH_HAS_DEBUG_VM_PGTABLE.
Isn’t that only for compiling testing? Who is booting such a beast and make
sure
On 01/28/2020 12:06 PM, Qian Cai wrote:
>
>
>> On Jan 28, 2020, at 1:17 AM, Christophe Leroy
>> wrote:
>>
>> It is 'default y' so there is no much risk that it is forgotten, at least
>> all test suites run with 'allyes_defconfig' will trigger the test, so I
>> think it is really a good
> On Jan 28, 2020, at 1:17 AM, Christophe Leroy wrote:
>
> It is 'default y' so there is no much risk that it is forgotten, at least all
> test suites run with 'allyes_defconfig' will trigger the test, so I think it
> is really a good feature.
This thing depends on DEBUG_VM which I don’t
Le 28/01/2020 à 06:48, Qian Cai a écrit :
On Jan 27, 2020, at 11:58 PM, Anshuman Khandual
wrote:
As I had mentioned before, the test attempts to formalize page table helper
semantics
as expected from generic MM code paths and intend to catch deviations when
enabled on
a given
Le 28/01/2020 à 04:33, Qian Cai a écrit :
On Jan 27, 2020, at 10:06 PM, Anshuman Khandual
wrote:
On 01/28/2020 07:41 AM, Qian Cai wrote:
On Jan 27, 2020, at 8:28 PM, Anshuman Khandual
wrote:
This adds tests which will validate architecture page table helpers and
other accessors
> On Jan 27, 2020, at 11:58 PM, Anshuman Khandual
> wrote:
>
> As I had mentioned before, the test attempts to formalize page table helper
> semantics
> as expected from generic MM code paths and intend to catch deviations when
> enabled on
> a given platform. How else should we test
On 01/28/2020 09:03 AM, Qian Cai wrote:
>
>
>> On Jan 27, 2020, at 10:06 PM, Anshuman Khandual
>> wrote:
>>
>>
>>
>> On 01/28/2020 07:41 AM, Qian Cai wrote:
>>>
>>>
On Jan 27, 2020, at 8:28 PM, Anshuman Khandual
wrote:
This adds tests which will validate architecture
> On Jan 27, 2020, at 10:06 PM, Anshuman Khandual
> wrote:
>
>
>
> On 01/28/2020 07:41 AM, Qian Cai wrote:
>>
>>
>>> On Jan 27, 2020, at 8:28 PM, Anshuman Khandual
>>> wrote:
>>>
>>> This adds tests which will validate architecture page table helpers and
>>> other accessors in their
On 01/28/2020 07:41 AM, Qian Cai wrote:
>
>
>> On Jan 27, 2020, at 8:28 PM, Anshuman Khandual
>> wrote:
>>
>> This adds tests which will validate architecture page table helpers and
>> other accessors in their compliance with expected generic MM semantics.
>> This will help various
> On Jan 27, 2020, at 8:28 PM, Anshuman Khandual
> wrote:
>
> This adds tests which will validate architecture page table helpers and
> other accessors in their compliance with expected generic MM semantics.
> This will help various architectures in validating changes to existing
> page
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