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    Subject[PATCH v5 4/5] perf script: Add a python library EventClass.py
    Date
    This library defines several class types for perf events which could
    help to better analyze the event samples. Currently there are just a
    few classes, PerfEvent is the base class for all perf events, PebsEvent
    is a HW base Intel x86 PEBS event, and user could add more SW/HW event
    classes based on requriements.

    Signed-off-by: Feng Tang <feng.tang@intel.com>
    ---
    .../Perf-Trace-Util/lib/Perf/Trace/EventClass.py | 95 ++++++++++++++++++++
    1 files changed, 95 insertions(+), 0 deletions(-)
    create mode 100755 tools/perf/scripts/python/Perf-Trace-Util/lib/Perf/Trace/EventClass.py

    diff --git a/tools/perf/scripts/python/Perf-Trace-Util/lib/Perf/Trace/EventClass.py b/tools/perf/scripts/python/Perf-Trace-Util/lib/Perf/Trace/EventClass.py
    new file mode 100755
    index 0000000..12cd773
    --- /dev/null
    +++ b/tools/perf/scripts/python/Perf-Trace-Util/lib/Perf/Trace/EventClass.py
    @@ -0,0 +1,95 @@
    +# EventClass.py
    +#
    +# This is a libray defining some events typs classes, which could
    +# be used by other scripts to analyzing the perf samples.
    +#
    +# Currently there are just a few classes defined for examples,
    +# PerfEvent is the base class for all perf event sample, PebsEvent
    +# is a HW base Intel x86 PEBS event, and user could add more SW/HW
    +# event classes based on requriements.
    +
    +import struct
    +
    +# Event types, user could add more here
    +EVTYPE_GENERIC = 0
    +EVTYPE_PEBS = 1 # Basic PEBS event
    +EVTYPE_PEBS_LL = 2 # PEBS event with load latency info
    +EVTYPE_IBS = 3
    +
    +#
    +# Currently we don't have good way to tell the event type, but by
    +# the size of raw buffer, raw PEBS event with load latency data's
    +# size is 176 bytes, while the pure PEBS event's size is 144 bytes.
    +#
    +def create_event(name, comm, dso, symbol, raw_buf):
    + if (len(raw_buf) == 144):
    + event = PebsEvent(name, comm, dso, symbol, raw_buf)
    + elif (len(raw_buf) == 176):
    + event = PebsNHM(name, comm, dso, symbol, raw_buf)
    + else:
    + event = PerfEvent(name, comm, dso, symbol, raw_buf)
    +
    + return event
    +
    +class PerfEvent(object):
    + event_num = 0
    + def __init__(self, name, comm, dso, symbol, raw_buf, ev_type=EVTYPE_GENERIC):
    + self.name = name
    + self.comm = comm
    + self.dso = dso
    + self.symbol = symbol
    + self.raw_buf = raw_buf
    + self.ev_type = ev_type
    + PerfEvent.event_num += 1
    +
    + def show(self):
    + print "PMU event: name=%12s, symbol=%24s, comm=%8s, dso=%12s" % (self.name, self.symbol, self.comm, self.dso)
    +
    +#
    +# Basic Intel PEBS (Precise Event-based Sampling) event, whose raw buffer
    +# contains the context info when that event happened: the EFLAGS and
    +# linear IP info, as well as all the registers.
    +#
    +class PebsEvent(PerfEvent):
    + pebs_num = 0
    + def __init__(self, name, comm, dso, symbol, raw_buf, ev_type=EVTYPE_PEBS):
    + tmp_buf=raw_buf[0:80]
    + flags, ip, ax, bx, cx, dx, si, di, bp, sp = struct.unpack('QQQQQQQQQQ', tmp_buf)
    + self.flags = flags
    + self.ip = ip
    + self.ax = ax
    + self.bx = bx
    + self.cx = cx
    + self.dx = dx
    + self.si = si
    + self.di = di
    + self.bp = bp
    + self.sp = sp
    +
    + PerfEvent.__init__(self, name, comm, dso, symbol, raw_buf, ev_type)
    + PebsEvent.pebs_num += 1
    + del tmp_buf
    +
    +#
    +# Intel Nehalem and Westmere support PEBS plus Load Latency info which lie
    +# in the four 64 bit words write after the PEBS data:
    +# Status: records the IA32_PERF_GLOBAL_STATUS register value
    +# DLA: Data Linear Address (EIP)
    +# DSE: Data Source Encoding, where the latency happens, hit or miss
    +# in L1/L2/L3 or IO operations
    +# LAT: the actual latency in cycles
    +#
    +class PebsNHM(PebsEvent):
    + pebs_nhm_num = 0
    + def __init__(self, name, comm, dso, symbol, raw_buf, ev_type=EVTYPE_PEBS_LL):
    + tmp_buf=raw_buf[144:176]
    + status, dla, dse, lat = struct.unpack('QQQQ', tmp_buf)
    + self.status = status
    + self.dla = dla
    + self.dse = dse
    + self.lat = lat
    +
    + PebsEvent.__init__(self, name, comm, dso, symbol, raw_buf, ev_type)
    + PebsNHM.pebs_nhm_num += 1
    + del tmp_buf
    +
    --
    1.7.1


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