Re: [RFC][PATCH 1/6] count transparent hugepage splits

[Dave Hansen]

On Fri, 2011-02-04 at 22:18 +0100, Andrea Arcangeli wrote:
> On Thu, Feb 03, 2011 at 01:22:14PM -0800, David Rientjes wrote:
> > i.e. no global locking, but we've accepted the occassional off-by-one 
> > error (even though splitting of hugepages isn't by any means lightning 
> > fast and the overhead of atomic ops would be negligible).
> 
> Agreed losing an increment is not a problem, but in very large systems
> it will become a bottleneck. It's not super urgent, but I think it
> needs to become a per-cpu counter sooner than later (not needed
> immediately but I would appreciate an incremental patch soon to
> address that). 

Seems like something that would be fairly trivial with the existing
count_vm_event() infrastructure.  Any reason not to use that?  I'll be
happy to tack a patch on to my series.

-- 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/