linux-kernel - Re: [RFC PATCH 00/13] x86 User Interrupts support

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Date:   Thu, 23 Sep 2021 17:17:12 -0700
From:   Sohil Mehta <sohil.mehta@...el.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     "Hansen, Dave" <dave.hansen@...el.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Luck, Tony" <tony.luck@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        "Lutomirski, Andy" <luto@...nel.org>, Jens Axboe <axboe@...nel.dk>,
        Christian Brauner <christian@...uner.io>,
        Peter Zijlstra <peterz@...radead.org>,
        Shuah Khan <shuah@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Jonathan Corbet <corbet@....net>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        "Kammela, Gayatri" <gayatri.kammela@...el.com>,
        "Zeng, Guang" <guang.zeng@...el.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "Witt, Randy E" <randy.e.witt@...el.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        "Thomas, Ramesh" <ramesh.thomas@...el.com>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>
Subject: Re: [RFC PATCH 00/13] x86 User Interrupts support

On 9/23/2021 5:19 AM, Greg KH wrote:

> What real workload can actually use this?
>
I missed replying to this.

User mode runtimes is one the usages that we think would benefit from 
User IPIs.

Also as Jens mentioned in another thread, this could help kernel to user 
notifications in io_uring (using User Interrupts instead of eventfd for 
signaling).

Libevent is another abstraction that we are evaluating.


Thanks,

Sohil