On 5/29/2013 3:08 PM, Andrew Morton wrote:
On Sat, 25 May 2013 13:32:02 +0900 Kyungmin Park <kmpark@xxxxxxxxxxxxx> wrote:
I haven't seen any response to this patch but it has been of some benefit
to some of our use cases. You're welcome to add
Tested-by: Laura Abbott <lauraa@xxxxxxxxxxxxxx>
Thanks Laura,
We already got mail from Andrew, it's merged mm tree.
Yes, but I have it scheduled for 3.11 with no -stable backport.
This is because the patch changelog didn't tell me about the
userspace-visible impact of the bug. Judging from Laura's comments, this
was a mistake.
So please: details. What problems were observable to Laura and do we
think this bug should be fixed in 3.10 and earlier?
We were observing allocation failures of higher order pages (order 5 =
128K typically) under tight memory conditions resulting in driver
failure. The output from the page allocation failure showed plenty of
free pages of the appropriate order/type/zone and mostly CMA pages in
the lower orders.
For full disclosure, we still observed some page allocation failures
even after applying the patch but the number was drastically reduced and
those failures were attributed to fragmentation/other system issues.
Thanks,
Laura
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