On 10/29/2015 06:13 AM, Anton Blanchard wrote:

Here are various improvements to our context switch path. Some of the
highlights:

- Group all mfsprs and mtsprs in __switch_to(), which gives us a
  10% improvement on POWER8.

- Create giveup_all() and flush_all_to_thread() so we only write the
  MSR once, which gives us a 3% improvement on POWER8.

- Create disable_kernel_{fp,altivec,vsx,spe}() and add a debug boot
  option (ppc_strict_facility_enable) to minimise kernel code running
  with floating point and vector bits enabled.

- Make giveup_vsx() and flush_vsx_to_thread() handle FP and Altivec
  state, so they behave more like their sister functions.

Scott: There are changes to the SPE code here which I have only been
able to compile test.

Hey Anton,

Wondering if you have a git tree hosted some where to pull these patches ?

-- Anshuman