Re: [PATCH 00/13] 3.12-stable backport of NUMA balancing patches

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Hi Mel,

On Thu, Jan 09, 2014 at 10:12:29AM +0000, Mel Gorman wrote:
> On Wed, Jan 08, 2014 at 05:50:29PM +0000, Luis Henriques wrote:
> > Hi Mel,
> > 
> > On Tue, Jan 07, 2014 at 02:00:35PM +0000, Mel Gorman wrote:
> > > A number of NUMA balancing patches were tagged for -stable but I got a
> > > number of rejected mails from either Greg or his robot minion.  The list
> > > of relevant patches is
> > > 
> > > FAILED: patch "[PATCH] mm: numa: serialise parallel get_user_page against THP"
> > > FAILED: patch "[PATCH] mm: numa: call MMU notifiers on THP migration"
> > > MERGED: Patch "mm: clear pmd_numa before invalidating"
> > > FAILED: patch "[PATCH] mm: numa: do not clear PMD during PTE update scan"
> > > FAILED: patch "[PATCH] mm: numa: do not clear PTE for pte_numa update"
> > > MERGED: Patch "mm: numa: ensure anon_vma is locked to prevent parallel THP splits"
> > > MERGED: Patch "mm: numa: avoid unnecessary work on the failure path"
> > > MERGED: Patch "sched: numa: skip inaccessible VMAs"
> > > FAILED: patch "[PATCH] mm: numa: clear numa hinting information on mprotect"
> > > FAILED: patch "[PATCH] mm: numa: avoid unnecessary disruption of NUMA hinting during"
> > > Patch "mm: fix TLB flush race between migration, and change_protection_range"
> > > Patch "mm: numa: guarantee that tlb_flush_pending updates are visible before page table updates"
> > > FAILED: patch "[PATCH] mm: numa: defer TLB flush for THP migration as long as"
> > > 
> > > Fixing the rejects one at a time may cause other conflicts due to ordering
> > > issues. Instead, this patch series against 3.12.6 is the full list of
> > > backported patches in the expected order. Greg, unfortunately this means
> > > you may have to drop some patches already in your stable tree and reapply
> > > but on the plus side they should be then in the correct order for bisection
> > > purposes and you'll know I've tested this combination of patches.
> > > 
> > > Thanks.
> > 
> > I was going throught these commits for the 3.11 kernel and it looks like
> > all your backports apply cleanly.  Could you please help me and confirm if
> > all of these are applicable to this older kernel as well?
> > 
> 
> They should apply cleanly and there should be no problems. However, there
> are a number of other NUMA balancing related patches between 3.11 and
> 3.12. These ones on particular would be desirable (no others spring to mind)
> 
> 0255d491848032f6c601b6410c3b8ebded3a37b1 mm: Account for a THP NUMA hinting update as one PTE update
> 3f926ab945b60a5824369d21add7710622a2eac0 mm: Close races between THP migration and PMD numa clearing
> c61109e34f60f6e85bb43c5a1cd51c0e3db40847 mm: numa: Sanitize task_numa_fault() callsites
> 587fe586f44a48f9691001ba6c45b86c8e4ba21f mm: Prevent parallel splits during THP migration
> 42836f5f8baa33085f547098b74aa98991ee9216 mm: Wait for THP migrations to complete during NUMA hinting faults
> 1dd49bfa3465756b3ce72214b58a33e4afb67aa3 mm: numa: Do not account for a hinting fault if we raced

All of these commits have already been included on the stable 3.11 kernel
by Greg (in 3.11.8 release).

> So if I was taking the 3.12-stable backport patches into 3.11-stable then
> I would also bring these to avoid unique surprises. Bear in mind that I
> have not tested this combination of patches against 3.11 though. If
> these apply cleany and you want a test then punt a monolithic patch or a
> git tree at me and I'll queue it up.

That would be awesome!  I have my current 3.11 stable queue here:

 git://kernel.ubuntu.com/ubuntu/linux.git linux-3.11.y-queue

This tree contains the patches I'm queuing for the next 3.11 extended
stable release, and already include your 3.12-stable backport patches.

And thanks a lot ;)

Cheers,
--
Luis
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