linux.git/arch/powerpc/kernel/process.c, branch v2.6.29

[PATCH] idle cputime accounting

2008-12-31T14:11:46+00:00

The cpu time spent by the idle process actually doing something is
currently accounted as idle time. This is plain wrong, the architectures
that support VIRT_CPU_ACCOUNTING=y can do better: distinguish between the
time spent doing nothing and the time spent by idle doing work. The first
is accounted with account_idle_time and the second with account_system_time.
The architectures that use the account_xxx_time interface directly and not
the account_xxx_ticks interface now need to do the check for the idle
process in their arch code. In particular to improve the system vs true
idle time accounting the arch code needs to measure the true idle time
instead of just testing for the idle process.
To improve the tick based accounting as well we would need an architecture
primitive that can tell us if the pt_regs of the interrupted context
points to the magic instruction that halts the cpu.

In addition idle time is no more added to the stime of the idle process.
This field now contains the system time of the idle process as it should
be. On systems without VIRT_CPU_ACCOUNTING this will always be zero as
every tick that occurs while idle is running will be accounted as idle
time.

This patch contains the necessary common code changes to be able to
distinguish idle system time and true idle time. The architectures with
support for VIRT_CPU_ACCOUNTING need some changes to exploit this.

Signed-off-by: Martin Schwidefsky

powerpc: Allow the max stack trace depth to be configured

2008-12-03T09:46:35+00:00

On my screen, when something crashes, I only have space for maybe 16
functions of the stack trace before the information above it scrolls
off the screen.  It's easy to hack the kernel to print out only that
much, but it's harder to remember to do it.  This introduces a config
option for it so that I can keep the setting in my config.

Signed-off-by: Johannes Berg 
Signed-off-by: Paul Mackerras

powerpc: Add MSR[CE, DE] to the MSR bits we print on show_regs()

2008-12-03T09:46:35+00:00

Signed-off-by: Kumar Gala 
Signed-off-by: Paul Mackerras

powerpc: Remove use of CONFIG_PPC_MERGE

2008-08-04T03:18:17+00:00

Now that arch/ppc is gone and CONFIG_PPC_MERGE is always set, remove
the dead code associated with !CONFIG_PPC_MERGE from arch/powerpc
and include/asm-powerpc.

Signed-off-by: Kumar Gala 
Signed-off-by: Paul Mackerras

powerpc/booke: Clean up the hardware watchpoint support

2008-07-28T06:30:47+00:00

* CONFIG_BOOKE is selected by CONFIG_44x so we dont need both
* Fixed a few comments
* Go back to only using DBCR0_IDM to determine if we are using
  debug resources.

Signed-off-by: Kumar Gala 
Signed-off-by: Benjamin Herrenschmidt

powerpc: BookE hardware watchpoint support

2008-07-25T05:44:39+00:00

This patch implements support for HW based watchpoint via the
DBSR_DAC (Data Address Compare) facility of the BookE processors.

It does so by interfacing with the existing DABR breakpoint code
and adding the necessary bits and pieces for the new bits to
be properly set or cleared

Signed-off-by: Luis Machado 
Signed-off-by: Benjamin Herrenschmidt

powerpc: fix giveup_vsx to save registers correctly

2008-07-15T02:29:23+00:00

giveup_vsx didn't save the FPU and VMX regsiters.  Change it to be
like giveup_fpr/altivec which save these registers.

Also update call sites where FPU and VMX are already saved to use the
original giveup_vsx (renamed to __giveup_vsx).

Signed-off-by: Michael Neuling 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Use new printk extension %pS to print symbols on oops

2008-07-09T06:30:44+00:00

This changes the oops and backtrace code to use the new %pS
printk extension to print out symbols rather than manually
calling print_symbol.

Signed-off-by: Benjamin Herrenschmidt

powerpc: Remove old dump_task_* functions

2008-07-03T06:58:13+00:00

Since Roland's ptrace cleanup starting with commit
f65255e8d51ecbc6c9eef20d39e0377d19b658ca ("[POWERPC] Use user_regset
accessors for FP regs"), the dump_task_* functions are no longer being
used.

Signed-off-by: Michael Neuling 
Signed-off-by: Paul Mackerras

powerpc: Update for VSX core file and ptrace

2008-07-01T04:47:09+00:00

This correctly hooks the VSX dump into Roland McGrath core file
infrastructure.  It adds the VSX dump information as an additional elf
note in the core file (after talking more to the tool chain/gdb guys).
This also ensures the formats are consistent between signals, ptrace
and core files.

Signed-off-by: Michael Neuling 
Signed-off-by: Paul Mackerras