rust_binder: move (e)poll wait queue to Process

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Most processes do not use Rust Binder with epoll, so avoid paying the
synchronize_rcu() cost in drop for those that don't need it. For those
that do, we also manage to replace synchronize_rcu() with kfree_rcu(),
though we introduce an extra allocation.

In case the last ref to an Arc<Thread> is dropped outside of
deferred_release(), this also ensures that synchronize_rcu() is not
called in destructor of Arc<Thread> in other places. Theoretically that
could lead to jank by making other syscalls slow, which would be
problematic.

Signed-off-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Boqun Feng <boqun@kernel.org>
Link: https://patch.msgid.link/20260707-upgrade-poll-v6-2-4b8fae7bf1d9@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Alice Ryhl 2026-07-07 10:43:13 +00:00 • committed by Greg Kroah-Hartman

parent e5e86df8b6

commit dbb17c9ea7

4 changed files with 95 additions and 60 deletions

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4

drivers/android/binder/node.rs

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67

drivers/android/binder/process.rs

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78

drivers/android/binder/thread.rs

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6

drivers/android/binder/transaction.rs

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