Date: Tue, 09 Sep 2008 00:14:14 +0200 From: Pietro Cerutti <gahr@FreeBSD.org> To: Nate Lawson <nate@root.org> Cc: freebsd-acpi@FreeBSD.org, bug-followup@FreeBSD.org Subject: Re: kern/124223: [acpi] [patch] acpi_battery.c -- Notify user-defined critical level via devd(8) Message-ID: <48C5A3B6.2070807@FreeBSD.org> In-Reply-To: <48C5A152.9020505@root.org> References: <48C14091.4060309@FreeBSD.org> <48C16810.2030003@root.org> <48C59C98.5020408@FreeBSD.org> <48C5A152.9020505@root.org>
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Nate Lawson wrote:
| Pietro Cerutti wrote:
|> Nate Lawson wrote:
|> | There are a few problems with your approach.
|> |
|> | Critical status is already reported with a flag when usermode polls for
|> | the battery status:
|> |> if (sc->bst.state & ACPI_BATT_STAT_CRITICAL) {
|> |> if ((sc->flags & ACPI_BATT_STAT_CRITICAL) == 0) {
|> |> sc->flags |= ACPI_BATT_STAT_CRITICAL;
|> |> device_printf(dev, "critically low charge!\n");
|> |> }
|> |> }
|>
|> I agree. Critical level is already checked for in the cmbat module.
|> However, reporting is not done in a "standardized" way. My patch would
|> just like to add notification through devd.
|
| But it doesn't just add notification through devd. It adds a thread,
| that separately polls for battery state and sends a notify through devd.
| If the user is running any battery app, there's a double poll for the
| same info.
|
| I subscribe to the design approach that where it makes sense to do
| something in usermode, don't do it in kernel mode. In this case, the IO
| interface is poll-only, and any user app that is running can set its own
| policy for how to deal with the information it gets from polling.
[snip xbatt-related stuff]
| Let's keep this in usermode, where policy belongs.
That's fine. Thanks for reviewing that!
Best,
- --
Pietro Cerutti
gahr@FreeBSD.org
PGP Public Key:
http://gahr.ch/pgp
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