113 lines
4.6 KiB
Python
113 lines
4.6 KiB
Python
#
|
|
# Copyright(c) 2020-2021 Intel Corporation
|
|
# SPDX-License-Identifier: BSD-3-Clause
|
|
#
|
|
import re
|
|
|
|
from core.test_run import TestRun
|
|
from connection.utils.output import CmdException
|
|
|
|
SYSFS_LINE_FORMAT = r"^(\d+\s+){10,}\d+$"
|
|
PROCFS_LINE_FORMAT = r"^\d+\s+\d+\s+[\w-]+\s+" + SYSFS_LINE_FORMAT[1:]
|
|
|
|
|
|
# This class represents block device I/O statistics.
|
|
# For more information see:
|
|
# https://www.kernel.org/doc/Documentation/admin-guide/iostats.rst
|
|
class IoStats:
|
|
def __init__(self):
|
|
self.reads = None # field 0
|
|
self.reads_merged = None # field 1
|
|
self.sectors_read = None # field 2
|
|
self.read_time_ms = None # field 3
|
|
self.writes = None # field 4
|
|
self.writes_merged = None # field 5
|
|
self.sectors_written = None # field 6
|
|
self.write_time_ms = None # field 7
|
|
self.ios_in_progress = None # field 8
|
|
self.io_time_ms = None # field 9
|
|
self.io_time_weighed_ms = None # field 10
|
|
# only in kernels 4.18+
|
|
self.discards = None # field 11
|
|
self.discards_merged = None # field 12
|
|
self.sectors_discarded = None # field 13
|
|
self.discard_time_ms = None # field 14
|
|
# only in kernels 5.5+
|
|
self.flushes = None # field 15
|
|
self.flush_time_ms = None # field 16
|
|
|
|
def __sub__(self, other):
|
|
if self.reads < other.reads:
|
|
raise Exception("Cannot subtract Reads")
|
|
if self.writes < other.writes:
|
|
raise Exception("Cannot subtract Writes")
|
|
|
|
stats = IoStats()
|
|
stats.reads = self.reads - other.reads
|
|
stats.reads_merged = self.reads_merged - other.reads_merged
|
|
stats.sectors_read = self.sectors_read - other.sectors_read
|
|
stats.read_time_ms = self.read_time_ms - other.read_time_ms
|
|
stats.writes = self.writes - other.writes
|
|
stats.writes_merged = self.writes_merged - other.writes_merged
|
|
stats.sectors_written = self.sectors_written - other.sectors_written
|
|
stats.write_time_ms = self.write_time_ms - other.write_time_ms
|
|
stats.ios_in_progress = 0
|
|
stats.io_time_ms = self.io_time_ms - other.io_time_ms
|
|
stats.io_time_weighed_ms = self.io_time_weighed_ms - other.io_time_weighed_ms
|
|
if stats.discards and other.discards:
|
|
stats.discards = self.discards - other.discards
|
|
if stats.discards_merged and other.discards_merged:
|
|
stats.discards_merged = self.discards_merged - other.discards_merged
|
|
if stats.sectors_discarded and other.sectors_discarded:
|
|
stats.sectors_discarded = self.sectors_discarded - other.sectors_discarded
|
|
if stats.discard_time_ms and other.discard_time_ms:
|
|
stats.discard_time_ms = self.discard_time_ms - other.discard_time_ms
|
|
if stats.flushes and other.flushes:
|
|
stats.flushes = self.flushes - other.flushes
|
|
if stats.flush_time_ms and other.flush_time_ms:
|
|
stats.flush_time_ms = self.flush_time_ms - other.flush_time_ms
|
|
return stats
|
|
|
|
@staticmethod
|
|
def parse(stats_line: str):
|
|
stats_line = stats_line.strip()
|
|
|
|
if re.match(SYSFS_LINE_FORMAT, stats_line):
|
|
fields = stats_line.split()
|
|
elif re.match(PROCFS_LINE_FORMAT, stats_line):
|
|
fields = stats_line.split()[3:]
|
|
else:
|
|
raise Exception(f"Wrong input format for diskstat parser")
|
|
|
|
values = [int(f) for f in fields]
|
|
|
|
stats = IoStats()
|
|
stats.reads = values[0]
|
|
stats.reads_merged = values[1]
|
|
stats.sectors_read = values[2]
|
|
stats.read_time_ms = values[3]
|
|
stats.writes = values[4]
|
|
stats.writes_merged = values[5]
|
|
stats.sectors_written = values[6]
|
|
stats.write_time_ms = values[7]
|
|
stats.ios_in_progress = values[8]
|
|
stats.io_time_ms = values[9]
|
|
stats.io_time_weighed_ms = values[10]
|
|
if len(values) > 11:
|
|
stats.discards = values[11]
|
|
stats.discards_merged = values[12]
|
|
stats.sectors_discarded = values[13]
|
|
stats.discard_time_ms = values[14]
|
|
if len(values) > 15:
|
|
stats.flushes = values[15]
|
|
stats.flush_time_ms = values[16]
|
|
return stats
|
|
|
|
@staticmethod
|
|
def get_io_stats(device_id):
|
|
stats_output = TestRun.executor.run_expect_success(
|
|
f"cat /proc/diskstats | grep '{device_id} '")
|
|
if not stats_output.stdout.strip():
|
|
raise CmdException("Failed to get statistics for device " + device_id, stats_output)
|
|
return IoStats.parse(stats_line=stats_output.stdout.splitlines()[0])
|