Re: Running with vm.overcommit_memory=2

[Avi Kivity <avi argo co il>]

Ralf Ertzinger wrote:

> Hi.
>
> Rik van Riel <riel redhat com> wrote:
>
>  
>
> > You configured the kernel to not overcommit memory, so it won't.
> > It makes sure that all the memory that was requested is available
> > for programs to use, regardless of whether programs actually use it.
> >    
>
> Is the amount of memory that 'free' reports as 'free' (or /proc/meminfo
> states as 'MemFree:') the amount of unrequested memory, or does it include
> requested but not actually used memory?
>  
used memory includes file-backed (cached) memory, and kernel memory, so 
'free' does not fit any of your descriptions.

> If the latter, where can one see the amount of unrequested memory?
>
>  
total requested memory is in /proc/meminfo:Committed_AS, which is 
limited by swap + half ram. subtract the former from the latter to see 
how far you can go.



--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.