cpufreq: use smp_call_function_[single|many]() in acpi-cpufreq.c

Atttempting to rid us of the problematic work_on_cpu().  Just use
smp_call_fuction_single() here.

This repairs a 10% sysbench(oltp)+mysql regression which Mike reported,
due to

  commit 6b44003e5ca66a3fffeb5bc90f40ada2c4340896
  Author: Andrew Morton <[email protected]>
  Date:   Thu Apr 9 09:50:37 2009 -0600

      work_on_cpu(): rewrite it to create a kernel thread on demand

It seems that the kernel calls these acpi-cpufreq functions at a quite
high frequency.

Valdis Kletnieks also reports that this causes 70-90 forks per second on
his hardware.

Cc: [email protected]
Cc: Rusty Russell <[email protected]>
Cc: Venkatesh Pallipadi <[email protected]>
Cc: Len Brown <[email protected]>
Cc: Zhao Yakui <[email protected]>
Acked-by: Dave Jones <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Tested-by: Mike Galbraith <[email protected]>
Cc: "Zhang, Yanmin" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
[ Made it use smp_call_function_many() instead of looping over cpu's
  with smp_call_function_single()    - Linus ]
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions