linux-kernel - Re: [PATCH 0/6] return an error when cqe is dropped

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Date:   Thu, 21 Apr 2022 13:45:06 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     dylany@...com, io-uring@...r.kernel.org
Cc:     asml.silence@...il.com, linux-kernel@...r.kernel.org,
        kernel-team@...com
Subject: Re: [PATCH 0/6] return an error when cqe is dropped

On Thu, 21 Apr 2022 02:13:39 -0700, Dylan Yudaken wrote:
> This series addresses a rare but real error condition when a CQE is
> dropped. Many applications rely on 1 SQE resulting in 1 CQE and may even
> block waiting for the CQE. In overflow conditions if the GFP_ATOMIC
> allocation fails, the CQE is dropped and a counter is incremented. However
> the application is not actively signalled that something bad has
> happened. We would like to indicate this error condition to the
> application but in a way that does not rely on the application doing
> invasive changes such as checking a flag before each wait.
> 
> [...]

Applied, thanks!

[1/6] io_uring: add trace support for CQE overflow
      commit: f457ab8deb017140aef05be3027a00a18a7d16b7
[2/6] io_uring: trace cqe overflows
      commit: 2a847e6faf76810ae68a6e81bd9ac3a7c81534d0
[3/6] io_uring: rework io_uring_enter to simplify return value
      commit: db9bb58b391c9e62da68bc139598e8470d892c77
[4/6] io_uring: use constants for cq_overflow bitfield
      commit: b293240e2634b2100196d7314aeeb84299ce6d5b
[5/6] io_uring: return an error when cqe is dropped
      commit: 34a7ee8a42c8496632465f3f0b444b3a7b908c46
[6/6] io_uring: allow NOP opcode in IOPOLL mode
      commit: ebbe59f49556822b9bcc7b0d4d96bae31f522905

Best regards,
-- 
Jens Axboe