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Re: [PATCH 02/29] tools: add a new xen logging daemon
- To: Andrew Cooper <andcooper@xxxxxxxxx>, Jason Andryuk <jandryuk@xxxxxxxxx>
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Fri, 3 Nov 2023 08:36:39 +0100
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Wei Liu <wl@xxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>
- Delivery-date: Fri, 03 Nov 2023 07:37:01 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02.11.23 20:15, Andrew Cooper wrote:
On 02/11/2023 7:44 am, Juergen Gross wrote:
On 01.11.23 19:36, Jason Andryuk wrote:
On Wed, Nov 1, 2023 at 10:27 AM Juergen Gross <jgross@xxxxxxxx> wrote:
Add "xenlogd", a new logging daemon meant to support infrastructure
domains (e.g. xenstore-stubdom) to write log files in dom0.
As I understand it, your new daemon is a generic 9pfs backend, which
you use for logging. I think naming it something like xen9pfsd would
more accurately describe its functionality.
Fine with me. I'll wait a little bit to see what others think.
FWIW, I too looked at xenlogd and thought it probably wasn't ideal, but
I was going to wait until glancing at the whole series before suggesting
an alternative.
If it really is a generic 9pfs backend, then +1 to Jason's suggestion,
although preferably as xen-9pfsd for improved legibility.
Okay.
But a couple of other remarks while I'm here.
It's great to see that it only uses stable libraries, and I hope that
remains true to the end of the series. If we end up wanting unstable
APIs, can I suggest that we take the opportunity to stabilise them as a
prerequisite.
No unstable APIs. It does use xenctrl.h, but it needs that only for the
cpu barriers. Maybe we should extract those to another header?
In this patch, stop_me needs to be volatile or read with
ACCESS_ONCE()/etc. The only thing stopping GCC turning it into an
infinite loop is sleep() being an external call.
Okay, will use volatile.
daemon_running may
need similar treatment, depending on how it gets used in later patches.
I don't think it needs special treatment.
Juergen
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