Re: [PATCH] io_uring/futex: return a wait's data to the cache when it fails to arm

[Jens Axboe]

On Mon, 19 Oct 2026 16:12:43 -0700, Austin Schuh wrote:
> io_futex_wait() takes its io_futex_data from ctx->futex_cache, and a
> completed wait gives it back in io_futex_complete().  A wait that fails
> to arm kfree()s it instead.
> 
> The usual failure is -EAGAIN from futex_wait_setup(): the futex word no
> longer holds the expected value.  That is routine for a waiter that
> re-arms with the value it last read, since the word changes whenever
> there is something to wake for.  Each such failure takes an object out
> of the cache for good, so the cache drains and from then on waits
> allocate.
> 
> [...]

Applied, thanks!

[1/1] io_uring/futex: return a wait's data to the cache when it fails to arm
      commit: 02caa5922184e99da04b37fd3336066625ea8e2e

Best regards,
-- 
Jens Axboe