linux-kernel - Re: [PATCH v6 1/2] ptrace,syscall_user_dispatch: Implement Syscall User Dispatch Suspension

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Message-ID: <20230126151035.GC4069@redhat.com>
Date:   Thu, 26 Jan 2023 16:10:36 +0100
From:   Oleg Nesterov <oleg@...hat.com>
To:     Gregory Price <gregory.price@...verge.com>
Cc:     Andrei Vagin <avagin@...il.com>,
        Gregory Price <gourry.memverge@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Gabriel Krisman Bertazi <krisman@...labora.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH v6 1/2] ptrace,syscall_user_dispatch: Implement Syscall
 User Dispatch Suspension

On 01/26, Gregory Price wrote:
>
> So basic questions are:
> 1) Andrei do you think any injection occurs during quiesce that can't be
>    worked around?
>
> 2) Oleg is the auto-clearing nature of the flag sufficient justification
>    for keeping SUSPEND?

I understand that SUSPEND is more convenient for CRIU and more "safe".

But. This kernel is already overbloated ;) IMO, if SUSPEND is not strictly
necessary, it should be dropped.

Oleg.