1:1 M:N threading

1:1 M:N threading

[Breno]

Hi.

What kind of threading kernel 2.4 and 2.6 do ? 1:1 or M:N ?


thanks
Breno

Re: 1:1 M:N threading

[Rémi Colinet]

Breno wrote:

>Hi.
>
>What kind of threading kernel 2.4 and 2.6 do ? 1:1 or M:N ?
>
>
>thanks
>Breno
>
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Hello,

For 2.6, the default is NGPT (see 
http://www-124.ibm.com/developerworks/oss/pthreads/) which is 1:1.

Regards
Rémi

Re: 1:1 M:N threading

[Alan Cox]

On Sul, 2003-09-14 at 19:44, Breno wrote:
> Hi.
> 
> What kind of threading kernel 2.4 and 2.6 do ? 1:1 or M:N ?

The kernel doesn't impose a specific model although its certainly
strongly oriented to 1:1 threading models by simply making the kernel
threading/locking so efficient the M:N stuff isnt worth the overhead

Re: 1:1 M:N threading

[Robert Love]

On Sun, 2003-09-14 at 14:44, Breno wrote:

> What kind of threading kernel 2.4 and 2.6 do ? 1:1 or M:N ?

Both do 1:1.

But nothing stops you from running an M:1 or M:N threading library in
user-space on top of the kernel abstraction.

	Robert Love

Memory allocation

[Breno]

Hi,

When i use kmem_cache_alloc() to create a vma and return addr of this vma ,
the pages have already been allocated and mapped ?  or i must use
mk_pte/set_pte to map the page to my vma ?

att
Breno

Re: 1:1 M:N threading

[jpo234]

remi.colinet@wanadoo.fr wrote:
 > For 2.6, the default is NGPT (see 
 > http://www-124.ibm.com/developerworks/oss/pthreads/) which is 1:1.

NGPT is frozen and in maintenance mode (which is a different
wording for "dead"). See
http://www-124.ibm.com/pthreads/docs/announcement
The new default Linux pthread implementation is RedHats NPTL. See
http://people.redhat.com/~drepper/nptl-design.pdf
for details, which btw. is 1:1 as well.

Regards
  jpo

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Re: 1:1 M:N threading

[Andrea Arcangeli]

On Mon, Sep 15, 2003 at 05:12:59AM -0400, jpo234@netscape.net wrote:
> remi.colinet@wanadoo.fr wrote:
>  > For 2.6, the default is NGPT (see 
>  > http://www-124.ibm.com/developerworks/oss/pthreads/) which is 1:1.
> 
> NGPT is frozen and in maintenance mode (which is a different
> wording for "dead"). See
> http://www-124.ibm.com/pthreads/docs/announcement

and btw, NGPT isn't 1:1 but M:N.

Andrea

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