Re: pthread_create() slow for many threads; also time to revisit64b context switch optimization?

[Ulrich Drepper]

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Arjan van de Ven wrote:
> yeah maybe we should also tell it we expect it to be used downwards.
> Oh wait.. MAP_GROWSDOWN ?

MAP_GROWSDOWN is unusable because we have to allocate the entire address
range for the stack.  Otherwise some other allocation happens in that
range and all of a sudden the stack cannot grow as much as needed anymore.

These flags really can be removed.  They should not be used because they
are outright dangerous.

- --
â Ulrich Drepper â Red Hat, Inc. â 444 Castro St â Mountain View, CA â
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