Re: [Libhugetlbfs-devel] Hugepages_Rsvd goes huge in 2.6.20-rc7

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

On 06.02.2007 [12:24:42 +1100], David Gibson wrote:
> On Mon, Feb 05, 2007 at 04:55:47PM -0800, Nishanth Aravamudan wrote:
> > On 05.02.2007 [16:25:34 -0800], Nishanth Aravamudan wrote:
> > > Sorry, I botched Hugh's e-mail address, please make sure to reply to the
> > > correct one.
> > > 
> > > Thanks,
> > > Nish
> > > 
> > > On 05.02.2007 [16:19:04 -0800], Nishanth Aravamudan wrote:
> > > > Hi all,
> > > > 
> > > > So, here's the current state of the hugepages portion of my
> > > > /proc/meminfo (x86_64, 2.6.20-rc7, will test with 2.6.20
> > > > shortly, but AFAICS, there haven't been many changes to hugepage
> > > > code between the two):
> > 
> > Reproduced on 2.6.20, and I think I've got a means to make it more
> > easily reproducible (at least on x86_64).
<snip>
> > Also note, that I'm not trying to defend the way I'm approaching
> > this problem in libhugetlbfs (I'm very open to alternatives) -- but
> > regardless of what I do there, I don't think Rsvd should be
> > 18446744073709551615 ...
> 
> Oh, certainly not.  Clearly we're managing to decrement it more times
> than we're incrementing it somehow.  I'd check the codepath for the
> madvise() thing, we may not be handling that properly.

FYI, Ken Chen's patch fixes the problem for me:

http://marc2.theaimsgroup.com/?l=linux-mm&m=117079608820399&w=2

Thanks,
Nish

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

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