Messages in this thread | | | Date | Wed, 5 Sep 2012 00:40:27 +0200 | From | Andrea Arcangeli <> | Subject | Re: [RFC v2 PATCH 0/7] thp: transparent hugepages on s390 |
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Hi Andrew and Martin,
On Fri, Aug 31, 2012 at 12:47:02PM -0700, Andrew Morton wrote: > On Fri, 31 Aug 2012 09:07:57 +0200 > Martin Schwidefsky <schwidefsky@de.ibm.com> wrote: > > > > I grabbed them all. Patches 1-3 look sane to me and I cheerfully > > > didn't read the s390 changes at all. Hopefully Andrea will be able to > > > review at least patches 1-3 for us. > > > > > > If that all goes well, how do we play this? I'd prefer to merge 1-3 > > > myself, as they do interact with ongoing MM development. I can also > > > merge 4-7 if appropriate s390 maintainer acks are seen. Or I can drop > > > them and the s390 parts can be merged via the s390 tree at a later > > > date? > > > > I would really appreciate if Andrea could have a look at the code. > > Yes please ;)
:) Sorry for the delay! I was at the Plumbers until last Friday and I'm catching up with the emails.
I finished reviewing them and they look perfectly fine. In fact it was a pleasure to read them. Patch 1 and 2 are noops in x86 context, patch 3 is fine as well.
The s390 solution to send a dummy IPIs to wait gup-fast to exit the critical section after setting the splitting bit looks fine as well.
The only additional code cleanup suggestion I can give is to also add a HAVE_ARCH_TRANSPARENT_HUGEPAGE on the same lines of:
http://git.kernel.org/?p=linux/kernel/git/andrea/aa.git;a=commitdiff;h=36c2d096cce61fcfc1726ea1c1fd6dd65ddf8b08;hp=b2a86603629e2401d85f9ed1acbcf6c0043b2b23
as patch 8. In order to convert the below:
+ depends on (X86 || (S390 && 64BIT)) && MMU
to:
depends on HAVE_ARCH_TRANSPARENT_HUGEPAGE
The MMU check looks already superflous, even more so after adding the HAVE_ARCH_TRANSPARENT_HUGEPAGE (if something it'll be up to the arch code to add a dependency on it before defining HAVE_ARCH_).
Thanks, Andrea
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