Re: Default size limits for /run (/var/run) and /run/lock (/var/lock)
On Wednesday 13 April 2011, Ben Hutchings wrote:
> On Wed, Apr 13, 2011 at 03:17:24PM +0000, Philipp Kern wrote:
> > On 2011-04-13, David Goodenough <david.goodenough@btconnect.com> wrote:
> > > I am surprised at this. I have several boxes which are small single
> > > board computers with solid state disks (MIDE or CF), so as I did not
> > > need swap space (the running set is fixed and the memory requirement
> > > was within the total available memory, I did not define any swap
> > > space. A few days ago I needed to move one of the boxes I noted its
> > > uptime at 594 days just before I switched it off. I grant you that it
> > > has 256MB of memory, and 120MB is currently free, but I have not
> > > noticed any problems growing over the time it was up. Maybe it just
> > > did not need to make any large physically contiguous allocations.
> >
> > Given that Linux does paging, you normally don't need large physically
> > contiguous allocations. I think the exceptions are mainly I/O regions
> > for DMA.
>
> Heap allocations also have to be contiguous. And every thread needs a
> kernel stack which is at least 2 contiguous pages on most architectures.
>
> > And you're probably not using that heavily on such a machine.
Its acting as a network router. So presumably once everything is
allocated, it keeps reusing them.
David
>
> Evidently.
>
> Ben.
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