3 # This is a library defining some events types classes, which could
4 # be used by other scripts to analyzing the perf samples.
6 # Currently there are just a few classes defined for examples,
7 # PerfEvent is the base class for all perf event sample, PebsEvent
8 # is a HW base Intel x86 PEBS event, and user could add more SW/HW
9 # event classes based on requirements.
13 # Event types, user could add more here
15 EVTYPE_PEBS = 1 # Basic PEBS event
16 EVTYPE_PEBS_LL = 2 # PEBS event with load latency info
20 # Currently we don't have good way to tell the event type, but by
21 # the size of raw buffer, raw PEBS event with load latency data's
22 # size is 176 bytes, while the pure PEBS event's size is 144 bytes.
24 def create_event(name, comm, dso, symbol, raw_buf):
25 if (len(raw_buf) == 144):
26 event = PebsEvent(name, comm, dso, symbol, raw_buf)
27 elif (len(raw_buf) == 176):
28 event = PebsNHM(name, comm, dso, symbol, raw_buf)
30 event = PerfEvent(name, comm, dso, symbol, raw_buf)
34 class PerfEvent(object):
36 def __init__(self, name, comm, dso, symbol, raw_buf, ev_type=EVTYPE_GENERIC):
41 self.raw_buf = raw_buf
42 self.ev_type = ev_type
43 PerfEvent.event_num += 1
46 print "PMU event: name=%12s, symbol=%24s, comm=%8s, dso=%12s" % (self.name, self.symbol, self.comm, self.dso)
49 # Basic Intel PEBS (Precise Event-based Sampling) event, whose raw buffer
50 # contains the context info when that event happened: the EFLAGS and
51 # linear IP info, as well as all the registers.
53 class PebsEvent(PerfEvent):
55 def __init__(self, name, comm, dso, symbol, raw_buf, ev_type=EVTYPE_PEBS):
57 flags, ip, ax, bx, cx, dx, si, di, bp, sp = struct.unpack('QQQQQQQQQQ', tmp_buf)
69 PerfEvent.__init__(self, name, comm, dso, symbol, raw_buf, ev_type)
70 PebsEvent.pebs_num += 1
74 # Intel Nehalem and Westmere support PEBS plus Load Latency info which lie
75 # in the four 64 bit words write after the PEBS data:
76 # Status: records the IA32_PERF_GLOBAL_STATUS register value
77 # DLA: Data Linear Address (EIP)
78 # DSE: Data Source Encoding, where the latency happens, hit or miss
79 # in L1/L2/L3 or IO operations
80 # LAT: the actual latency in cycles
82 class PebsNHM(PebsEvent):
84 def __init__(self, name, comm, dso, symbol, raw_buf, ev_type=EVTYPE_PEBS_LL):
85 tmp_buf=raw_buf[144:176]
86 status, dla, dse, lat = struct.unpack('QQQQ', tmp_buf)
92 PebsEvent.__init__(self, name, comm, dso, symbol, raw_buf, ev_type)
93 PebsNHM.pebs_nhm_num += 1