On Fri, 22 Jan 2016 20:42:11 +0100 Christian Borntraeger [off-list ref] wrote:

On 12/28/2015 11:22 PM, Linus Torvalds wrote:

quoted

On Mon, Dec 28, 2015 at 1:10 PM, Cyrill Gorcunov [off-list ref] wrote:

quoted

Really sorry for delays. Konstantin, I slightly updated the
changelog (to point where problem came from). Linus are you
fine with accounting not only anonymous memory in VmData?

The patch looks ok to me. I guess if somebody relies on old behavior
we may have to tweak it a bit, but on the whole this looks sane and
I'd be happy to merge it in the 4.5 merge window (and maybe even have
it marked for stable if it works out)

Just want to mention that this patch breaks older versions of valgrind 
(including the current release)
https://bugs.kde.org/show_bug.cgi?id=357833
It is fixed in trunk (and even triggered some good cleanups, so the valgrind
developers do NOT want it to get reverted). Rawhide already has the valgrind
fix, others might not, so if we consider this for stable, things might break
here and there, but in general this looks like a good cleanup.

OK, thanks - that sounds reasonable, although a bit worrisome - what
other userspace was affected?  In some cases people won't find out for
years...

84638335900f199 ("mm: rework virtual memory accounting") did not have
the cc:stable tag so it should avoid the -stable dragnet.

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