linux-kernel - Re: [PATCH v2 0/3] livepatch: Introduce force sysfs attribute

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Message-ID: <alpine.LSU.2.21.1708301451271.6379@san.suse.cz>
Date:   Wed, 30 Aug 2017 14:52:03 +0200 (CEST)
From:   Miroslav Benes <mbenes@...e.cz>
To:     Petr Mladek <pmladek@...e.com>
cc:     jpoimboe@...hat.com, jeyu@...nel.org, jikos@...nel.org,
        lpechacek@...e.cz, live-patching@...r.kernel.org,
        linux-kernel@...r.kernel.org, Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Oleg Nesterov <oleg@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v2 0/3] livepatch: Introduce force sysfs attribute

On Wed, 16 Aug 2017, Petr Mladek wrote:

> On Thu 2017-08-10 12:48:12, Miroslav Benes wrote:
> > Currently, livepatch gradually migrate the system from an unpatched to a
> > patched state (or vice versa). Each task drops its TIF_PATCH_PENDING
> > itself when crossing the kernel/user space boundary or it is cleared
> > using the stack checking approach. If there is a task which sleeps on a
> > patched function, the whole transition can get stuck indefinitely.
> > 
> > TODO:
> > Now there is a sysfs attribute called "force", which provides two
> > functionalities, "signal" and "force" (previously "unmark"). I haven't
> > managed to come up with better names. Proposals are welcome. On the
> > other hand I do not mind it much.
> 
> What about calling the attribute?
> 
>      transition-speedup
>      transition-urge
> 
> In each case, I would make it more clear that the attribute
> is related to the transition attribute of each patch.

Umm... I don't like that much and those names would definitely confuse me. 
But I'm biased already.

Miroslav