Something went wrong. Try again.
(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
Something went wrong. Try again.
Python
at master
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798# EventClass.py# SPDX-License-Identifier: GPL-2.0## This is a library defining some events types 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 requirements.from __future__ import print_function
import struct
# Event types, user could add more hereEVTYPE_GENERIC = 0EVTYPE_PEBS = 1 # Basic PEBS eventEVTYPE_PEBS_LL = 2 # PEBS event with load latency infoEVTYPE_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