Re: [Bug 12832] New: kernel leaks a lot of memory

[Steven Rostedt <rostedt@goodmis.org>]

On Wed, 11 Mar 2009, Pierre Ossman wrote:

> On Wed, 11 Mar 2009 14:48:02 -0400 (EDT)
> Steven Rostedt <rostedt@goodmis.org> wrote:
> 
> > 
> > Hmm, I assumed (but could be wrong) that on boot up, the system checked 
> > how many CPUs were physically possible, and updated the possible CPU 
> > mask accordingly (default being NR_CPUS).
> > 
> > If this is not the case, then I'll have to implement hot plug allocation. 
> > :-/
> > 
> 
> I have no idea, but every system doesn't suffer from this problem so
> there is something more to this. Modern fedora kernels have NR_CPUS set
> to 512, and it's not like I'm missing 1.5 GB here. :)
> 

I'm thinking it is a system dependent feature. I'm working on implementing 
the ring buffers to only allocate for online CPUS. I just realized that 
there's a check of a ring buffer cpu mask to see if it is OK to write to 
that CPU buffer. This works out perfectly, to keep non allocated buffers 
from being written to.

Thanks,

-- Steve

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>