[dm-devel] [PATCH] Handle error paths.

[Jonathan Brassow]

Ummm?

  brassow

On Jan 8, 2009, at 1:25 PM, Konrad Rzeszutek wrote:

>
> On memory constrained systems, where a large amount of LUNs are
> assigned (say more enough to make multipath blossom to 70% of  
> available
> memory space) forking would fail returning -ENOMEM. The kernel has  
> enough
> free pages for the new process, but when it clones the new child  
> process
> from the parent process space it accounts the parent process heap  
> space
> against the child (which counts for more pages than there are free  
> pages).
>
> Using vfork passes a flag to clone which will inhibit this calculation
> and instead check for free pages. The danger in using vfork is that  
> the child
> could use the values from the parent, but fortunatly we don't do  
> that and
> immediately call 'execve' swipping the process space free.
>
>
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