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Kernel Log: Coming in 2.6.32 (Part 6): Infrastructure

Nov 30, 2009, 14:04 (1 Talkback[s])
(Other stories by Thorsten Leemhuis)


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"Support has been added for ACPI 4.0 and there are two new make targets which generate kernel configurations attuned to the running system. Changes to the power management subsystem increase data throughput and allow better use of runtime power saving features on modern I/O devices.

"On releasing Linux 2.6.32-rc8, Linus Torvalds hinted that kernel version 2.6.32 could be released by the end of this month. The Kernel Log therefore brings its reporting on the changes in kernel 2.6.32 to an end, dedicating the sixth article in the 'What's coming in 2.6.32' series to changes in and around the kernel infrastructure. The first four articles in the series dealt with changes in the networking subsystem, in the graphics hardware, in storage hardware and file systems and in other drivers, while the fifth article looked at architecture code, memory management, virtualisation and tracing .


"Various patches add support for ACPI 4.0 to the Linux kernel. They are accompanied by a driver for ACPI 4.0-compliant power meters and an ACPI Processor Aggregator Device Driver. The latter makes individual CPUs idle when instructed to do so via ACPI 4.0, in order to temporarily reduce power consumption in the event, for example, of an electrical emergency or impending overheating. This allows a system to continuing running, albeit with reduced performance, rather than switching itself off. Its merger followed a long discussion in which Torvalds spoke out in favour of the driver – details can be found in an article on LWN.net."

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