Messages in this thread | | | From | Mike Rapoport <> | Subject | [PATCH 0/3] userfaultfd: non-cooperative: syncronous events | Date | Tue, 27 Feb 2018 10:19:49 +0200 |
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Hi,
These patches add ability to generate userfaultfd events so that their processing will be synchronized with the non-cooperative thread that caused the event.
In the non-cooperative case userfaultfd resumes execution of the thread that caused an event when the notification is read() by the uffd monitor. In some cases, like, for example, madvise(MADV_REMOVE), it might be desirable to keep the thread that caused the event suspended until the uffd monitor had the event handled to avoid races between the thread that caused the and userfaultfd ioctls.
Theses patches extend the userfaultfd API with an implementation of UFFD_EVENT_REMOVE_SYNC that allows to keep the thread that triggered UFFD_EVENT_REMOVE until the uffd monitor would not wake it explicitly.
Mike Rapoport (3): userfaultfd: introduce userfaultfd_init_waitqueue helper userfaultfd: non-cooperative: generalize wake key structure userfaultfd: non-cooperative: allow synchronous EVENT_REMOVE
fs/userfaultfd.c | 191 +++++++++++++++++++++++++++++---------- include/uapi/linux/userfaultfd.h | 14 +++ 2 files changed, 158 insertions(+), 47 deletions(-)
-- 2.7.4
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