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From: Sidong Yang <sidong.yang@furiosa.ai>
To: Jens Axboe <axboe@kernel.dk>
Cc: io-uring <io-uring@vger.kernel.org>
Subject: Re: [PATCH] io-uring: futex: cache io_futex_data than kfree
Date: Fri, 24 Jan 2025 10:15:18 +0900	[thread overview]
Message-ID: <Z5LppkEQ9tGdfwrX@sidongui-MacBookPro.local> (raw)
In-Reply-To: <a366bb4b-dd8c-486e-91b5-46dad940e603@kernel.dk>

On Thu, Jan 23, 2025 at 06:36:06AM -0700, Jens Axboe wrote:

Hi, Jens.
Thanks for review!

> On 1/23/25 3:50 AM, Sidong Yang wrote:
> > If futex_wait_setup() fails in io_futex_wait(), Old code just releases
> > io_futex_data. This patch tries to cache io_futex_data before kfree.
> 
> It's not that the patch is incorrect, but:
> 
> 1) This is an error path, surely we do not care about caching in
>    that case. If it's often hit, then the application would be buggy.
> 
> 2) If you're going to add an io_free_ifd() helper, then at least use it
>    for the normal case too that still open-codes it.

Agreed, So this patch could be make it buggy. You can drop this patch. I'll
find another task to work on. 

Thanks,
Sidong
> 
> -- 
> Jens Axboe
> 

  reply	other threads:[~2025-01-24  1:15 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-01-23 10:50 [PATCH] io-uring: futex: cache io_futex_data than kfree Sidong Yang
2025-01-23 13:36 ` Jens Axboe
2025-01-24  1:15   ` Sidong Yang [this message]
2025-01-24 13:37     ` Jens Axboe
2025-01-24 15:08       ` Sidong Yang

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