+Sasha and Paolo
On Thu, Apr 28, 2022, Hugh Dickins wrote:
On Thu, 28 Apr 2022, Greg Kroah-Hartman wrote:
On Thu, Apr 28, 2022 at 09:51:58AM -0700, Hugh Dickins wrote:
On Thu, 28 Apr 2022, Greg Kroah-Hartman wrote:
From: Hugh Dickins hughd@google.com
commit bd55b0c2d64e84a75575f548a33a3dfecc135b65 upstream.
PageDoubleMap is maintained differently for anon and for shmem+file: the shmem+file one was never cleared, because a safe place to do so could not be found; so it would blight future use of the cached hugepage until evicted.
See https://lore.kernel.org/lkml/1571938066-29031-1-git-send-email-yang.shi@linu...
But page_add_file_rmap() does provide a safe place to do so (though later than one might wish): allowing testing to return to an initial state without a damaging drop_caches.
Link: https://lkml.kernel.org/r/61c5cf99-a962-9a25-597a-53ab1bd8fbc0@google.com Fixes: 9a73f61bdb8a ("thp, mlock: do not mlock PTE-mapped file huge pages") Signed-off-by: Hugh Dickins hughd@google.com Reviewed-by: Yang Shi shy828301@gmail.com Cc: "Kirill A. Shutemov" kirill.shutemov@linux.intel.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
NAK.
I thought we had a long-standing agreement that AUTOSEL does not try to add patches from akpm's tree which had not been marked for stable.
True, this was my attempt at saying "hey these all look like they should go to stable trees, why not?"
Okay, it seems I should have read "AUTOSEL" as "Hey, GregKH here, these all look like they should go to stable trees, why not?", which would have drawn a friendlier response.
FWIW, Sasha has been using MANUALSEL for the KVM tree to solicit an explicit ACK from Paolo for these types of patches. AFAICT, it has been working quite well.