Re: Core dumps for threads

[Alan Cox]

> On Sat, Feb 24, 2001 at 09:57:44PM +0000, Alan Cox wrote:
> 
>     The I/O to dump the core would race other changes on the mm. The
>     right fix is probably to copy the mm (as fork does) then dump the
>     copy.
> 
> Stupid question... but since all threads see the same memory space as
> each other; can we not lock the entire vma for the process whilst
> it's being written out?

It isnt the vma, its the entire mm you would need to lock. And I dont think
you can do a deadlock free lock of that sanely, hence its better to copy
the mm (thats pretty efficienty anyway as it wont copy the data)