Re: [aarcange@redhat.com: [PATCH] fork vs gup(-fast) fix]

[KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>]

Hi


> > ---
> >  fs/direct-io.c            |    2 ++
> >  include/linux/init_task.h |    1 +
> >  include/linux/mm_types.h  |    3 +++
> >  kernel/fork.c             |    3 +++
> >  4 files changed, 9 insertions(+), 0 deletions(-)
> 
> It is an interesting patch. Thanks for throwing it into the discussion.
> I do prefer to close the race up for all cases if we decide to do
> anything at all about it, ie. all or nothing. But maybe others disagree.

Honestly, I wan't excepting linus's reaction. but I hope to make my v2.

My point is:
  - my patch don't prevent implement madvice(DONTCOW), I think.
  - andrea patch's complexity is mainly caused by avoiding perfromance degression effort,
    then, kernel later improvement can shrink his patch automatically.
    furtunately KSM don't merge yet. we can discuss his patch again at KSM submitting.
  - anyway, it can fix the bug.




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