x86, bts, hw-branch-tracer: add _noirq variants to the debug store interface

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The hw-branch-tracer uses debug store functions from an on_each_cpu()
context, which is simply wrong since the functions may sleep.

Add _noirq variants for most functions, which  may be called with
interrupts disabled.

Separate per-cpu and per-task tracing and allow per-cpu tracing to be
controlled from any cpu.

Make the hw-branch-tracer use the new debug store interface, synchronize
with hotplug cpu event using get/put_online_cpus(), and remove the
unnecessary spinlock.

Make the ptrace bts and the ds selftest code use the new interface.

Defer the ds selftest.

Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Cc: roland@redhat.com
Cc: eranian@googlemail.com
Cc: oleg@redhat.com
Cc: juan.villacis@intel.com
Cc: ak@linux.jf.intel.com
LKML-Reference: <20090403144555.658136000@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

...

This commit is contained in:

Markus Metzger 2009-04-03 16:43:40 +02:00 • committed by Ingo Molnar

parent 35bb7600c1

commit de79f54f53

5 changed files with 492 additions and 246 deletions

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57

arch/x86/include/asm/ds.h

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476

arch/x86/kernel/ds.c

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9

arch/x86/kernel/ds_selftest.c

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5

arch/x86/kernel/ptrace.c

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191

kernel/trace/trace_hw_branches.c

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