[LWN] Power-aware scheduling meets a line in the sand

Reference:
http://lwn.net/Articles/552885/

It looks like the power management framework is not such satisfied now.

[Phoronix] some stuff about linux-3.10

Reference:
http://www.phoronix.com/scan.php?page=news_item&px=MTM2MTg&utm_source=feedly
http://www.phoronix.com/scan.php?page=news_item&px=MTM2NDA&utm_source=feedly
http://www.phoronix.com/scan.php?page=news_item&px=MTM2NDQ&utm_source=feedly

Summary:

• A cpufreq driver for ARM's big.LITTLE is being introduced. 
• Some platform DRM driver pull request
• Audio drivers updated
• Compression offload support for audio capture. 
• Various HD audio improvements including codec delay support, improvements to the generic parser, Intel Haswell HDMI workarounds, and ALC268 codec support.
• USB audio regression fixes and new quriks. 
• Numerous ASoC improvements including performance optimizations and new codec drivers. 
• 
  

[Phoronix] Samsung Introduces "LAB" Linux Frequency Governor

Reference:
http://www.phoronix.com/scan.php?page=news_item&px=MTM0NzI
http://lkml.indiana.edu/hypermail/linux/kernel/1304.0/00089.html

Summary:
"The Legacy Application Boost(LAB) cpufreq governor uses historical cpuidle usage information for determining the number of currently active processor cores and uses that with the number of idle CPU cores for determining the next frequency dynamically. "

"One of the problem of ondemand is that it considers the most busy cpu only while doesn't care how many cpu is in busy state at the moment. This may results in unnecessary power consumption, and it'll be critical for the system having limited power source. 
To get the best energy efficiency, LAB governor considers not only idle time but also the number of idle cpus."

[LWN] ARM kernel floating-point emulation code removed

Reference:
http://lwn.net/Articles/546840/
http://www.phoronix.com/scan.php?page=news_item&px=MTM0ODA

Summary:

"Because of license issue, Russell King has just committed a patch to remove the arch/arm/nwfpe code from the kernel, and the VFP code emulating the FP operations. 


This will be very disruptive for ARMv4 and ARMv5 CPUs, which will no longer be able to run userspace with NWFPE support removed."

[Phoronix] Linux 3.10 May Have New Multi-Platform Support

Reference:
http://www.phoronix.com/scan.php?page=news_item&px=MTM0ODQ

Summary:
"With the Linux 3.10 kernel, the ARM multi-platform support may now extend to cover the very popular Samsung Exynos family."

[Phoronix] Linux DM-Crypt Being Parallelized

Reference:
http://www.phoronix.com/scan.php?page=news_item&px=MTM0NzQ

Summary:
"The dm-crypt subsystem provides for transparent disk encryption on Linux as part of the Device Mapper infrastructure and Crypto interfaces. 

The patches address sorting writes in the order they were submitted, moves submitting write requests to a separate CPU thread, and for automatically balancing the workload between available CPU cores. "

[Phoronix] Linux Kernel Power Management Targeting Memory

Reference:
http://www.phoronix.com/scan.php?page=news_item&px=MTM0NzU

Summary:
"With ACPI 5.0, the memory power information can be exposed to the operating system in a standardized way.

A 2GB Samsung Exynos ARM development board was able to save up to 6% of the total system power draw by making its MM subsystem power-aware.

The new (v2) patches consist of 15 patches that implement a "sorted buddy" allocator for attempting to reduce the number of active memory regions/DIMMs to benefit memory power savings."