[RFC GIT PULL] hw-breakpoints: Rewrite on top of perf counters

Frederic Weisbecker
2009-09-10T08:29:33Z

Hi,

This is a rewrite of the hardware breakpoints on top of perf counters.

Most of the details can be found in the 3rd and 4th patches.

To sum-up, this brings the perf tunable features that a perf
counter can perform:

- Hardware registers scheduling through a pmu
- Pinned/flexible, exlusive/non-exclusive, tunable periodic
events.
- Easier arch integration
- Optimized register allocation

There is still some work to do.
Beside the todo list found in individual patches:

- Fix a nasty bug: it doesn't properly free/unregister the breakpoint
after a use through ptrace. I should fix it soon.

- Drop the struct hw_breakpoint type and integrate the breakpoint core
fields into the counter structure (into the perf attributes)

Thanks,
Frederic.

---
The following changes since commit d6a65dffb30d8636b1e5d4c201564ef401a246cf:
Frederic Weisbecker (1):
tracing: Fix ring-buffer and ksym tracer merge interaction

are available in the git repository at:

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing.git
tracing/hw-breakpoints

Frederic Weisbecker (4):
perf_counter: Add open/close pmu callbacks
perf_counter: Export various perf helpers for external users
hw-breakpoints: Rewrite the hw-breakpoints layer on top of perf counters
hw-breakpoints: Arbitrate access to pmu following registers constraints

Li Zefan (1):
ksym_tracer: Remove KSYM_SELFTEST_ENTRY

arch/Kconfig | 3 +
arch/x86/include/asm/debugreg.h | 7 -
arch/x86/include/asm/hw_breakpoint.h | 31 ++-
arch/x86/include/asm/processor.h | 10 +-
arch/x86/kernel/hw_breakpoint.c | 217 ++++++++------
arch/x86/kernel/process.c | 4 +-
arch/x86/kernel/process_32.c | 28 +--
arch/x86/kernel/process_64.c | 28 +--
arch/x86/kernel/ptrace.c | 163 +++++++----
arch/x86/kernel/smpboot.c | 3 -
arch/x86/power/cpu.c | 6 -
include/asm-generic/hw_breakpoint.h | 20 +-
include/linux/perf_counter.h | 42 +++
kernel/hw_breakpoint.c | 543 ++++++++++++++++++++--------------
kernel/perf_counter.c | 112 +++++--
kernel/trace/trace.h | 1 -
kernel/trace/trace_ksym.c | 151 +++++++---
kernel/trace/trace_selftest.c | 2 +-
18 files changed, 840 insertions(+), 531 deletions(-)