We currently issue a new hcall for to retrieve the value of each 24x7
counter that we want to read. However, the H_GET_24x7_DATA hcall can
retrieve several counters in a single call, which would be useful in
getting a more consistent snapshot of the system.
Reorganize the code that prepares a 24x7 hcall request, submits it and
processes the result to allow reading seveal counters at once. We still
submit a fresh hcall for each event for now. A follow-on patch-set will
build on this to submit multiple perf_events in a single hcall.
Thanks to Peter Zijlstra for his input.
Changelog[v2]
- Split independent changes in patch 2 into patch 3.
- Minor changes to pr_err() (Patch 4).
- Move whitespace changes to separate patch (Patch 8).
- Minor function renames (Patch 10).
Sukadev Bhattiprolu (10):
powerpc/hv-24x7: Modify definition of request and result buffers
powerpc/hv24x7: Remove unnecessary parameter
perf/hv24x7: Use pr_devel() to log message
powerpc/hv-24x7: Drop event_24x7_request()
powerpc/hv24x7: Move debug prints to separate function
powerpc/hv-24x7: Rename hv_24x7_event_update
powerpc/hv-24x7: Define add_event_to_24x7_request()
perf/hv24x7: Whitespace cleanup
powerpc/hv-24x7: Define update_event_count()
powerpc/hv-24x7: Break up single_24x7_request
arch/powerpc/perf/hv-24x7.c | 212 +++++++++++++++++++++++++++-----------------
arch/powerpc/perf/hv-24x7.h | 8 +-
2 files changed, 137 insertions(+), 83 deletions(-)
--
1.8.3.1
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