Re: [RFC][PATCH 3/3] Documetation: update hugetlb information

[Nishanth Aravamudan <nacc@us.ibm.com>]

On 13.12.2007 [11:04:28 -0800], Dave Hansen wrote:
> On Thu, 2007-12-13 at 10:01 -0800, Nishanth Aravamudan wrote:
> > +Caveat: Shrinking the pool via nr_hugepages while a surplus is in effect
> > +will allow the number of surplus huge pages to exceed the overcommit
> > +value, as the pool hugepages (which must have been in use for a surplus
> > +hugepages to be allocated) will become surplus hugepages.  As long as
> > +this condition holds, however, no more surplus huge pages will be
> > +allowed on the system until one of the two sysctls are increased
> > +sufficiently, or the surplus huge pages go out of use and are freed.
> 
> I guess you could, in theory, disallow the writes to the sysctl and
> return -EINVAL or -ENOSPC or something.  But, I think documenting it
> like this is probably OK by itself and is pretty sane behavior given
> the circumstances.  

That's true -- would complicate the sysctl callback which is currently
able to just use one of the generic functions.

I'm willing to investigate changing this, if there is interest.

Thanks,
Nish

-- 
Nishanth Aravamudan <nacc@us.ibm.com>
IBM Linux Technology Center

--
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>