linux-kernel - Re: [PATCH] mm/zsmalloc: add log for module load/unload

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Date:	Tue, 27 Jan 2015 12:23:07 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Ganesh Mahendran <opensource.ganesh@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Nitin Gupta <ngupta@...are.org>, Linux-MM <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/zsmalloc: add log for module load/unload

Hello Ganesh,

On Tue, Jan 27, 2015 at 10:07:53AM +0800, Ganesh Mahendran wrote:
> Hello, Andrew
> 
> 2015-01-27 7:19 GMT+08:00 Andrew Morton <akpm@...ux-foundation.org>:
> > On Sat, 24 Jan 2015 21:48:41 +0800 Ganesh Mahendran <opensource.ganesh@...il.com> wrote:
> >
> >> Sometimes, we want to know whether a module is loaded or unloaded
> >> from the log.
> >
> > Why?  What's special about zsmalloc?
> >
> > Please provide much better justification than this.
> 
> When I debug with the zsmalloc module built in kernel.
> After system boots up, I did not see:
> /sys/kernel/debug/zsmalloc dir.
> 
> Although the reason for this is that I made a mistake. I
> forgot to add debugfs entry in /etc/fstab.
> But I think it is suitable to add information for a module load/unload.
> Then we can get this by:
> dmesg | grep zsmalloc.

I understand your trouble but it's general problem, not zsmalloc specific.
Then, if you really want to fix, you should approach more generic ways.

Thanks.

-- 
Kind regards,
Minchan Kim
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