Re: [RFC][PATCH 0/6] more detailed per-process transparent hugepagestatistics

[David Rientjes]

On Mon, 31 Jan 2011, Dave Hansen wrote:

> I'm working on some more reports that transparent huge pages and
> KSM do not play nicely together.  Basically, whenever THP's are
> present along with KSM, there is a lot of attrition over time,
> and we do not see much overall progress keeping THP's around:
> 
> 	http://sr71.net/~dave/ibm/038_System_Anonymous_Pages.png
> 
> (That's Karl Rister's graph, thanks Karl!)
> 
> However, I realized that we do not currently have a nice way to
> find out where individual THP's might be on the system.  We
> have an overall count, but no way of telling which processes or
> VMAs they might be in.
> 
> I started to implement this in the /proc/$pid/smaps code, but
> quickly realized that the lib/pagewalk.c code unconditionally
> splits THPs up.  This set reworks that code a bit and, in the
> end, gives you a per-map count of the numbers of huge pages.
> It also makes it possible for page walks to _not_ split THPs.
> 

Nice!  I'd like to start using this patchset immediately, I'm hoping 
you'll re-propose it with the fixes soon.

Thanks Dave.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/