On Fri, Aug 21, 2020 at 07:49:55PM -0400, Peter Xu wrote: > From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> > > 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@xxxxxxxxxxxxxxxxxxxx> > [peterx: add subject prefix] > Signed-off-by: Peter Xu <peterx@xxxxxxxxxx> > 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
