On Saturday 03 October 2009, Len Brown wrote: > Hi Linus, > > please pull from: > > git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6.git acpi-pad > > This will add the ACPI Processor Aggregator Driver to the kernel. > acpi_pad implements a new ACPI feature where the baseboard management > controller can ask Linux to force busy processors to stay idle. > > The BMC does this under dire electrical or thermal conditions > after it has already lowered the P-state to low frequencey mode > on all processors, yet the emergency persists. This offline > technique is used before employing even more invasive measures, > such as taking T-states down to 1/8th of LFM, or powering-off > the server completely. > > This driver will have no effect on the installed base, > no no old systems implement this new feature. However, this > simle driver in Linux will be useful as this feature > is deployed by OEMs on new hardware. > > As I mentioned previously, this is an ACPI patch, not a scheduler patch. > PeterZ is hoping to implement a more sophisticated method for forcing > idle time in the system with the scheduler, and when that is available, > I'll be delighted to update this driver to invoke it. > > thanks! > > -- > Len Brown > Intel Open Source Technology Center > > > ps. individual patches are available on linux-acpi@xxxxxxxxxxxxxxx > and a consolidated plain patch is available here: > http://ftp.kernel.org/pub/linux/kernel/people/lenb/acpi/patches/2.6.31/acpi-acpi-pad-20090521-2.6.31-rc4.diff.gz > > MAINTAINERS | 8 + > drivers/acpi/Kconfig | 12 + > drivers/acpi/Makefile | 2 + > drivers/acpi/acpi_pad.c | 514 +++++++++++++++++++++++++++++++++++++++++++++++ > 4 files changed, 536 insertions(+), 0 deletions(-) > create mode 100644 drivers/acpi/acpi_pad.c > > through these commits: > > Len Brown (1): > acpi_pad: build only on X86 > > Shaohua Li (1): > ACPI: create Processor Aggregator Device driver > > with this log: > > commit d91f79ebc3191b15dbe385925af4840f4e68df77 > Author: Len Brown <len.brown@xxxxxxxxx> > Date: Sun Sep 27 02:35:55 2009 -0400 > > acpi_pad: build only on X86 > > X86_FEATURE_MWAIT doesn't exist on ia64... > > Signed-off-by: Len Brown <len.brown@xxxxxxxxx> > > commit 8e0af5141ab950b78b3ebbfaded5439dcf8b3a8d > Author: Shaohua Li <shaohua.li@xxxxxxxxx> > Date: Mon Jul 27 18:11:02 2009 -0400 > > ACPI: create Processor Aggregator Device driver Can you please point me to the mailing list thread there this driver was posted (and possibly reviewed and discussed)? Best, Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
