[PATCH 0/8] Suspend block api (version 8)
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From: Matthew Garrett on 27 May 2010 18:20 On Thu, May 27, 2010 at 11:08:06PM +0100, Alan Cox wrote: > This is I believe robust (and has been implemented on some non x86 > boxes). It depends on not forcing running tasks into suspend. That is the > key. We've already established that ACPI systems require us to force running tasks into suspend. How do we avoid the race in that situation? -- Matthew Garrett | mjg59(a)srcf.ucam.org -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Alan Cox on 27 May 2010 18:20 On Thu, 27 May 2010 23:09:49 +0100 Matthew Garrett <mjg59(a)srcf.ucam.org> wrote: > On Thu, May 27, 2010 at 11:08:06PM +0100, Alan Cox wrote: > > > This is I believe robust (and has been implemented on some non x86 > > boxes). It depends on not forcing running tasks into suspend. That is the > > key. > > We've already established that ACPI systems require us to force running > tasks into suspend. How do we avoid the race in that situation? Android phones do not have ACPI. Embedded platforms do not have ACPI. MID x86 devices do not have ACPI. I would imagine the existing laptops will handle power management limited by the functionality they have available. Just like any other piece of hardware. Alan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Alan Cox on 27 May 2010 18:30 > The kernel performs no explicit notification to userspace. With legacy For a PC ACPI using type device /proc/acpi/events which wakes acpid which wakes gnome-power-manager which wakes half the universe Do we need a better more generic version of the events files - maybe but thats a rather different kettle of fish to suspend blockers. Alan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Matthew Garrett on 27 May 2010 18:40 On Thu, May 27, 2010 at 11:32:47PM +0100, Alan Cox wrote: > > The kernel performs no explicit notification to userspace. With legacy > > For a PC ACPI using type device /proc/acpi/events which wakes acpid which > wakes gnome-power-manager which wakes half the universe No, there's no explicit /proc/acpi/event notification on resume. > Do we need a better more generic version of the events files - maybe but > thats a rather different kettle of fish to suspend blockers. It's a requirement for any reasonable alternative approach. -- Matthew Garrett | mjg59(a)srcf.ucam.org -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Matthew Garrett on 27 May 2010 18:40
On Thu, May 27, 2010 at 11:23:57PM +0100, Alan Cox wrote: > On Thu, 27 May 2010 23:09:49 +0100 > Matthew Garrett <mjg59(a)srcf.ucam.org> wrote: > > > On Thu, May 27, 2010 at 11:08:06PM +0100, Alan Cox wrote: > > > > > This is I believe robust (and has been implemented on some non x86 > > > boxes). It depends on not forcing running tasks into suspend. That is the > > > key. > > > > We've already established that ACPI systems require us to force running > > tasks into suspend. How do we avoid the race in that situation? > > Android phones do not have ACPI. Embedded platforms do not have ACPI. MID > x86 devices do not have ACPI. It doesn't matter. Right now there's a race condition in terms of wakeup events on ACPI systems. What's your proposal for fixing that? -- Matthew Garrett | mjg59(a)srcf.ucam.org -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |