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Subject[PATCH 00/12] perf/x86-ibs: Precise event sampling with IBS for AMD CPUs
Date
This patch set adds support for precise event sampling with IBS. It
also contains IBS fixes and updates not directly related to precise
event sampling, but found during testing. There are no changes of perf
tools required, thus this set only contains kernel patches. There will
be also updated perf tools patches available that basically base on my
previous postings to this list and additionally implement IBS pseudo
events.

With IBS there are two counting modes available to count either cycles
or micro-ops. If the corresponding performance counter events (hw
events) are setup with the precise flag set, the request is redirected
to the ibs pmu:

perf record -a -e cpu-cycles:p ... # use ibs op counting cycle count
perf record -a -e r076:p ... # same as -e cpu-cycles:p
perf record -a -e r0C1:p ... # use ibs op counting micro-ops

Each IBS sample contains a linear address that points to the
instruction that was causing the sample to trigger. With ibs we have
skid 0.

Though the skid is 0, we map IBS sampling to following precise levels:

1: RIP taken from IBS sample or (if invalid) from stack.
2: RIP always taken from IBS sample, samples with an invalid rip
are dropped. Thus samples of an event containing two precise
modifiers (e.g. r076:pp) only contain (precise) addresses
detected with IBS.

Precise level 3 is reserved for other purposes in the future.

The patches base on a trivial merge of tip/perf/core into
tip/perf/x86-ibs. The merge and also the patches are available here:

The following changes since commit 820b3e44dc22ac8072cd5ecf82d62193392fcca3:

Merge remote-tracking branch 'tip/perf/core' into HEAD (2012-03-21 19:15:20 +0100)

are available in the git repository at:

git://git.kernel.org/pub/scm/linux/kernel/git/rric/oprofile.git perf-ibs

-Robert


Robert Richter (12):
perf/x86-ibs: Fix update of period
perf: Pass last sampling period to perf_sample_data_init()
perf/x86-ibs: Enable ibs op micro-ops counting mode
perf/x86-ibs: Fix frequency profiling
perf/x86-ibs: Take instruction pointer from ibs sample
perf/x86-ibs: Precise event sampling with IBS for AMD CPUs
perf/x86-ibs: Rename some variables
perf/x86-ibs: Trigger overflow if remaining period is too small
perf/x86-ibs: Extend hw period that triggers overflow
perf/x86-ibs: Implement workaround for IBS erratum #420
perf/x86-ibs: Catch spurious interrupts after stopping ibs
perf/x86-ibs: Fix usage of IBS op current count

arch/alpha/kernel/perf_event.c | 3 +-
arch/arm/kernel/perf_event_v6.c | 4 +-
arch/arm/kernel/perf_event_v7.c | 4 +-
arch/arm/kernel/perf_event_xscale.c | 8 +-
arch/mips/kernel/perf_event_mipsxx.c | 2 +-
arch/powerpc/kernel/perf_event.c | 3 +-
arch/powerpc/kernel/perf_event_fsl_emb.c | 3 +-
arch/sparc/kernel/perf_event.c | 4 +-
arch/x86/include/asm/perf_event.h | 6 +-
arch/x86/kernel/cpu/perf_event.c | 4 +-
arch/x86/kernel/cpu/perf_event_amd.c | 7 +-
arch/x86/kernel/cpu/perf_event_amd_ibs.c | 274 +++++++++++++++++++++--------
arch/x86/kernel/cpu/perf_event_intel.c | 4 +-
arch/x86/kernel/cpu/perf_event_intel_ds.c | 6 +-
arch/x86/kernel/cpu/perf_event_p4.c | 6 +-
include/linux/perf_event.h | 5 +-
kernel/events/core.c | 9 +-
17 files changed, 237 insertions(+), 115 deletions(-)
--
1.7.8.4




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