On 04/10/2022 15:21, Joel Sherrill wrote:
On Tue, Oct 4, 2022 at 12:40 AM Sebastian Huber
<sebastian.hu...@embedded-brains.de
<mailto:sebastian.hu...@embedded-brains.de>> wrote:
On 30/09/2022 23:39, Chris Johns wrote:
> On 30/9/2022 7:21 pm, Sebastian Huber wrote:
>> Update #4524.
>> ---
>> cpukit/doxygen/appl-config.h | 13 +++++
>> cpukit/include/rtems/rtems/config.h | 29 +++++++++-
>> cpukit/include/rtems/score/interr.h | 1 +
>> cpukit/sapi/src/interrtext.c | 3 +-
>> cpukit/sapi/src/malloctaskstackforidle.c | 59
+++++++++++++++++++++
>> spec/build/cpukit/librtemscpu.yml | 1 +
>> spec/build/testsuites/sptests/grp.yml | 2 +
>> spec/build/testsuites/sptests/spfatal36.yml | 19 +++++++
>> testsuites/sptests/spfatal36/init.c | 52
++++++++++++++++++
>> testsuites/sptests/spfatal36/spfatal36.doc | 11 ++++
>> testsuites/sptests/spinternalerror02/init.c | 2 +-
>> testsuites/sptests/sptls04/init.c | 2 +
>> 12 files changed, 191 insertions(+), 3 deletions(-)
>> create mode 100644 cpukit/sapi/src/malloctaskstackforidle.c
>> create mode 100644 spec/build/testsuites/sptests/spfatal36.yml
>> create mode 100644 testsuites/sptests/spfatal36/init.c
>> create mode 100644 testsuites/sptests/spfatal36/spfatal36.doc
>>
>> diff --git a/cpukit/doxygen/appl-config.h
b/cpukit/doxygen/appl-config.h
>> index aa6dbae648..ee647dc961 100644
>> --- a/cpukit/doxygen/appl-config.h
>> +++ b/cpukit/doxygen/appl-config.h
>> @@ -4842,6 +4842,19 @@
>> * configuration options. It is assumed that any memory
allocated for the
>> * stack of an IDLE task will not be from the RTEMS Workspace
or the memory
>> * statically allocated by default.
>> + *
>> + * For applications with a thread-local storage size which is
completely
>> + * unknown at the time the application configuration is
defined, RTEMS provides
>> + * an IDLE task stack allocator which uses rtems_malloc().
>
> I thought the TLS size was static and set by the linker? Has this
changed?
No, this didn't change.
>
> I am confused about the relationship between an unknown TLS size
and IDLE task?
> And the relationship of the TLS size and stack size?
Currently, the IDLE task storage area is statically allocated. The size
of this area is defined by CONFIGURE_IDLE_TASK_STACK_SIZE. So, this
configuration option doesn't directly specify the IDLE task stack size.
This size covers also the TLS area.
Thanks for speaking up Chris. I also don't like the idea that something that
has said and meant IDLE stack size was getting other items lumped into it.
>
>> * * The size of the
>> + * allocated thread storage area is the sum of stack size
defined by the
>> + * #CONFIGURE_IDLE_TASK_STACK_SIZE configuration option and the
actual
>> + * thread-local storage size of the application.
>
> The label CONFIGURE_IDLE_TASK_STACK_SIZE provides no insight into
it being
> effected by the TLS size.
>
>> * * Define this configuration
>> + * option to ``rtems_malloc_task_stack_for_idle`` to use this
allocator. If
>> + * the memory allocation fails, then the system terminates with the
>> + * INTERNAL_ERROR_CORE fatal source and the
>> + * INTERNAL_ERROR_NO_MEMORY_FOR_IDLE_TASK_STACK fatal code
during system
>> + * initialization.
>> + * @endparblock
>
> I am confused about the how and why I would use this change?
With the statically allocated storage area for the IDLE task you
need at
least an estimate of the size if you define the application
configuration. If you can't estimate it, then one option is to simply
allocate it dynamically.
Maybe a better approach is to allocate the IDLE task storage from the
workspace by default and use the CONFIGURE_IDLE_TASK_STACK_SIZE really
for the stack size and not the complete storage area. We could add a
new
configuration option (for example CONFIGURE_IDLE_TASK_STORAGE_SIZE) to
enable the static allocation.
CONFIGURE_IDLE_TASK_STORAGE_SIZE could default to the size of stack size
plus other items but it seems over complicated. Just have IDLE stack
size and the other
area for other items.
I don't know when IDLE task storage size was introduced but it has been
a long
time ago. Changing the semantics of it seems quite wrong.
Ok, I will send a v2 of the patch which:
* Changes the default IDLE task storage allocation to the workspace. It
will use CONFIGURE_IDLE_TASK_STACK_SIZE and this size will define the
stack size.
* Adds a new option CONFIGURE_IDLE_TASK_STORAGE_SIZE which will change
the IDLE task storage allocation to a statically allocated area which
will contain the task stack and the thread-local storage area.
* Adds a new option CONFIGURE_IDLE_TASK_MINIMUM_STACK_SIZE which ensures
that the IDLE task stack size has at least this size.
--
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