linux-kernel - Re: [PATCH] livepatch: introduce klp

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Date: Thu, 20 Jun 2024 11:31:15 +0200 (CEST)
From: Miroslav Benes <mbenes@...e.cz>
To: zhang warden <zhangwarden@...il.com>
cc: Song Liu <song@...nel.org>, Petr Mladek <pmladek@...e.com>, 
    Josh Poimboeuf <jpoimboe@...nel.org>, Jiri Kosina <jikos@...nel.org>, 
    Joe Lawrence <joe.lawrence@...hat.com>, live-patching@...r.kernel.org, 
    linux-kernel@...r.kernel.org
Subject: Re: [PATCH] livepatch: introduce klp_func called interface

Hi,

On Thu, 20 Jun 2024, zhang warden wrote:

> 
> 
> > On Jun 7, 2024, at 17:07, Miroslav Benes <mbenes@...e.cz> wrote:
> > 
> > It would be better than this patch but given what was mentioned in the 
> > thread I wonder if it is possible to use ftrace even for this. See 
> > /sys/kernel/tracing/trace_stat/function*. It already gathers the number of 
> > hits.
> > 
> 
> Hi, Miroslav
> 
> Can ftrace able to trace the function which I added into kernel by livepatching?

yes, it should also work as is. I just generally recommend to use a 
different name (prefixed for example) for the new replacement function to 
avoid issues if you do not already do it.

Miroslav