linux-kernel - Re: [for-next][PATCH 15/16] ftrace: Add freeing algorithm to free ftrace_mod

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Date:   Sun, 8 Oct 2017 14:42:14 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Joel Fernandes <joelaf@...gle.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jessica Yu <jeyu@...nel.org>,
        "Joel Fernandes (Google)" <joel.opensrc@...il.com>
Subject: Re: [for-next][PATCH 15/16] ftrace: Add freeing algorithm to free
 ftrace_mod_maps

On Sun, 8 Oct 2017 01:42:15 -0700
Joel Fernandes <joelaf@...gle.com> wrote:

> Hi Steve,
> 
> > "Joel Fernandes (Google)" <joel.opensrc@...il.com> wrote:  
> [..]
> > Also could you let me know what is the correct behavior of the filters
> > after a module being traced is unloaded, are the filters supposed to
> > be setup again after the module is unloaded, before the module can be
> > loaded again?  
> 
> Actually I learnt that it doesn't get preserved and wrote a patch to fix that, let me know
> what you think, thanks. (its only lightly tested - checked that the filters are preserved,
> will do more testing tomorrow):

They should not be preserved, it's too non-deterministic.

I'm wondering why the setting of the ip to zero didn't keep it from
showing up again. I'll have to investigate that.

-- Steve