Messages in this thread | | | From | Frederic Weisbecker <> | Subject | [RFC GIT PULL] hw-breakpoints: Rewrite on top of perf counters | Date | Thu, 10 Sep 2009 10:29:22 +0200 |
| |
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(-)
| |