Re: [Xen-devel] [PATCH] use per-cpu variables in cpufreq

[Keir Fraser <keir@xxxxxxx>]

On 27/05/2011 12:11, "Juergen Gross" <juergen.gross@xxxxxxxxxxxxxx> wrote:

> The cpufreq driver used some local arrays indexed by cpu number. This patch
> replaces those arrays by per-cpu variables. The AMD and INTEL specific parts
> used different per-cpu data structures with nearly identical semantics.
> Fold the two structures into one by adding a generic architecture data item.

Xen's per-cpu data gets freed across cpu offline/online, whereas cpu-indexed
arrays of course do not. Will the cpufreq state be correctly handled across
offline/online if we switch to per-cpu vars?

 -- Keir

> Signed-off-by: juergen.gross@xxxxxxxxxxxxxx
> 
> 
> 8 files changed, 58 insertions(+), 66 deletions(-)
> xen/arch/x86/acpi/cpufreq/cpufreq.c       |   36 ++++++++++++------------
> xen/arch/x86/acpi/cpufreq/powernow.c      |   43 +++++++++++------------------
> xen/drivers/acpi/pmstat.c                 |    6 ++--
> xen/drivers/cpufreq/cpufreq.c             |   24 ++++++++--------
> xen/drivers/cpufreq/cpufreq_ondemand.c    |    2 -
> xen/drivers/cpufreq/utility.c             |    8 ++---
> xen/include/acpi/cpufreq/cpufreq.h        |    3 +-
> xen/include/acpi/cpufreq/processor_perf.h |    2 -
> 
> 
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