Re: [announce, patch] 4G/4G split on x86, 64 GB RAM (and more) support

[Kirill Korotaev <dev@sw.ru>]

> I added a printf for the actual stack

> thread_self=4000
> my stack 0xbffff4df
> attr_init stack=00000000, stack_size=001FF000

> That's the output for pthread_attr_init. The manpage says it should fill in
> the default values and a 0 base is not that unreasonable for it.
0 is ok, the problem is in get_stackaddr.

> stack rlimit=1ff000
> thread=4000, stack=40035480, stack_size=40035480
> For the main() thread it's wrong.

exactly! For the main thread pthread_get_stackaddr returns a bull shit always 
:(

But at least java 1.3 has workaround inside and handles this magic value 
separatly and doesn't crash whis 3/1GB split (this value depends on TASK_SIZE 
or more preciesly on current stack value aligned to some big boundary (AFAIR, 
1GB)).

Anyway it's definietly a bug. I have a fix in a preloading .so library for 
glibc which overrides pthread_getstack_addr symbol. If you wish I can send it 
to you.

> my stack 0xbf7ffaab
> attr_init stack=00000000, stack_size=001FF000
> stack rlimit=1ff000
> thread=4002, stack=BF800000, stack_size=001FF000
>
> For the others everything is correct.
true.

[skip]

Kirill