linux-kernel - Re: [RFC PATCH 00/20] Introduce the famfs shared-memory file system

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Message-ID: <CAJfpeguLoO9ZfmJyqSO-Bma+cTyLaz9rDLv-mtfeNa1qGBww+A@mail.gmail.com>
Date: Fri, 24 May 2024 09:55:48 +0200
From: Miklos Szeredi <miklos@...redi.hu>
To: John Groves <John@...ves.net>
Cc: linux-cxl@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, nvdimm@...ts.linux.dev
Subject: Re: [RFC PATCH 00/20] Introduce the famfs shared-memory file system

On Fri, 24 May 2024 at 02:47, John Groves <John@...ves.net> wrote:

> Apologies, but I'm short on time at the moment - going into a long holiday
> weekend in the US with family plans. I should be focused again by middle of
> next week.

NP.

Obviously I'll need to test it before anything is merged, other than
that this is not urgent at all...

> But can you check /proc/cmdline to see of the memmap arg got through without
> getting mangled? The '$' tends to get fubar'd. You might need \$, or I've seen
> the need for \\\$. If it's un-mangled, there should be a dax device.

/proc/cmdline shows the option correctly:

root@kvm:~# cat /proc/cmdline
root=/dev/vda console=hvc0 memmap=4G$4G

> If that doesn't work, it's worth trying '!' instead, which I think would give
> you a pmem device - if the arg gets through (but ! is less likely to get
> horked). That pmem device can be converted to devdax...

That doesn't work either.  No device created in /dev  (dax or pmem).

free(1) does show that the reserved memory is gone in both cases, so
something does happen.

Attaching my .config as well.

Thanks,
Miklos

Download attachment ".config" of type "application/octet-stream" (89618 bytes)