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Subject[PATCH 00/21] binder: convert alloc->mutex to spinlock
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This series refactors the binder buffer allocation space to be able to
convert the alloc->mutex into a spinlock. Doing so decreases the latency
of binder transactions seen under worst-case scenarios.

I attempted to organize and improve readability of things that were
touched during this process. I also include a couple of fixes (unrelated
to the lock convertion) for issues I found along the way.

Regards,
Carlos Llamas

Cc: Todd Kjos <tkjos@google.com>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: John Stultz <jstultz@google.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Tim Murray <timmurray@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Carlos Llamas (21):
binder: use EPOLLERR from eventpoll.h
binder: fix use-after-free in shinker's callback
binder: fix race between mmput() and do_exit()
binder: fix async space check for 0-sized buffers
binder: fix trivial typo of binder_free_buf_locked()
binder: fix comment on binder_alloc_new_buf() return value
binder: remove extern from function prototypes
binder: keep vma addresses type as unsigned long
binder: split up binder_update_page_range()
binder: do unlocked work in binder_alloc_new_buf()
binder: remove pid param in binder_alloc_new_buf()
binder: separate the no-space debugging logic
binder: relocate low space calculation
binder: do not add pages to LRU in release path
binder: relocate binder_alloc_clear_buf()
binder: refactor page range allocation
binder: malloc new_buffer outside of locks
binder: initialize lru pages in mmap callback
binder: perform page allocation outside of locks
binder: reverse locking order in shrinker callback
binder: switch alloc->mutex to spinlock_t

drivers/android/binder.c | 25 +-
drivers/android/binder_alloc.c | 746 ++++++++++++------------
drivers/android/binder_alloc.h | 57 +-
drivers/android/binder_alloc_selftest.c | 8 +-
drivers/android/binder_trace.h | 2 +-
5 files changed, 428 insertions(+), 410 deletions(-)


base-commit: 21e80f3841c01aeaf32d7aee7bbc87b3db1aa0c6
--
2.42.0.869.gea05f2083d-goog

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