Messages in this thread | | | Date | Mon, 14 Sep 2020 11:38:29 -0300 | From | Jason Gunthorpe <> | Subject | Re: [PATCH 1/4] mm: Trial do_wp_page() simplification |
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On Fri, Aug 21, 2020 at 07:49:55PM -0400, Peter Xu wrote: > From: Linus Torvalds <torvalds@linux-foundation.org> > > How about we just make sure we're the only possible valid user fo the > page before we bother to reuse it? > > Simplify, simplify, simplify. > > And get rid of the nasty serialization on the page lock at the same time. > > Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> > [peterx: add subject prefix] > Signed-off-by: Peter Xu <peterx@redhat.com> > mm/memory.c | 59 +++++++++++++++-------------------------------------- > 1 file changed, 17 insertions(+), 42 deletions(-)
I don't have a detailed explanation right now, but this patch appears to be causing a regression where RDMA subsystem tests fail. Tests return to normal when this patch is reverted.
It kind of looks like the process is not seeing DMA'd data to a pin_user_pages()?
Thanks, Jason
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