linux-kernel - Re: [PATCH] bpf: add bpf_msleep

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Message-ID: <6g5d4y7ahyjcrlixjkzwgn473klmdhib376q5vvvfp2kelkk6t@yz6sipuhe2lt>
Date: Tue, 6 May 2025 11:20:35 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Kumar Kartikeya Dwivedi <memxor@...il.com>, Song Liu <song@...nel.org>
Cc: Sergey Senozhatsky <senozhatsky@...omium.org>, 
	Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	John Fastabend <john.fastabend@...il.com>, Martin KaFai Lau <martin.lau@...ux.dev>, 
	Eduard Zingerman <eddyz87@...il.com>, bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bpf: add bpf_msleep_interruptible()

On (25/05/05 21:30), Kumar Kartikeya Dwivedi wrote:
> On Mon, 5 May 2025 at 21:07, Song Liu <song@...nel.org> wrote:
> > Please keep in mind that BPF programs run in not sleepable
> > contexts, including NMIs. Maybe udelay() is a better option?

If we want to timeout various SCSI operations, for instance, I think
we need to sleep for seconds.  udelay() won't probably work for that.

> Or mark the kfunc KF_SLEEPABLE, IIUC the intention is to use it from
> hooks which are sleepable.

I think it is already marked as KF_SLEEPABLE.