159 lines
6.9 KiB
Python
159 lines
6.9 KiB
Python
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# Implements system state sampling. Called by buildstats.bbclass.
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# Because it is a real Python module, it can hold persistent state,
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# like open log files and the time of the last sampling.
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import time
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import re
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import bb.event
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class SystemStats:
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def __init__(self, d):
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bn = d.getVar('BUILDNAME')
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bsdir = os.path.join(d.getVar('BUILDSTATS_BASE'), bn)
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bb.utils.mkdirhier(bsdir)
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self.proc_files = []
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for filename, handler in (
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('diskstats', self._reduce_diskstats),
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('meminfo', self._reduce_meminfo),
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('stat', self._reduce_stat),
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):
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# The corresponding /proc files might not exist on the host.
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# For example, /proc/diskstats is not available in virtualized
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# environments like Linux-VServer. Silently skip collecting
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# the data.
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if os.path.exists(os.path.join('/proc', filename)):
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# In practice, this class gets instantiated only once in
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# the bitbake cooker process. Therefore 'append' mode is
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# not strictly necessary, but using it makes the class
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# more robust should two processes ever write
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# concurrently.
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destfile = os.path.join(bsdir, '%sproc_%s.log' % ('reduced_' if handler else '', filename))
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self.proc_files.append((filename, open(destfile, 'ab'), handler))
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self.monitor_disk = open(os.path.join(bsdir, 'monitor_disk.log'), 'ab')
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# Last time that we sampled /proc data resp. recorded disk monitoring data.
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self.last_proc = 0
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self.last_disk_monitor = 0
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# Minimum number of seconds between recording a sample. This
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# becames relevant when we get called very often while many
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# short tasks get started. Sampling during quiet periods
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# depends on the heartbeat event, which fires less often.
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self.min_seconds = 1
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self.meminfo_regex = re.compile(b'^(MemTotal|MemFree|Buffers|Cached|SwapTotal|SwapFree):\s*(\d+)')
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self.diskstats_regex = re.compile(b'^([hsv]d.|mtdblock\d|mmcblk\d|cciss/c\d+d\d+.*)$')
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self.diskstats_ltime = None
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self.diskstats_data = None
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self.stat_ltimes = None
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def close(self):
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self.monitor_disk.close()
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for _, output, _ in self.proc_files:
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output.close()
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def _reduce_meminfo(self, time, data):
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"""
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Extracts 'MemTotal', 'MemFree', 'Buffers', 'Cached', 'SwapTotal', 'SwapFree'
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and writes their values into a single line, in that order.
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"""
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values = {}
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for line in data.split(b'\n'):
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m = self.meminfo_regex.match(line)
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if m:
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values[m.group(1)] = m.group(2)
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if len(values) == 6:
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return (time,
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b' '.join([values[x] for x in
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(b'MemTotal', b'MemFree', b'Buffers', b'Cached', b'SwapTotal', b'SwapFree')]) + b'\n')
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def _diskstats_is_relevant_line(self, linetokens):
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if len(linetokens) != 14:
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return False
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disk = linetokens[2]
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return self.diskstats_regex.match(disk)
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def _reduce_diskstats(self, time, data):
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relevant_tokens = filter(self._diskstats_is_relevant_line, map(lambda x: x.split(), data.split(b'\n')))
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diskdata = [0] * 3
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reduced = None
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for tokens in relevant_tokens:
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# rsect
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diskdata[0] += int(tokens[5])
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# wsect
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diskdata[1] += int(tokens[9])
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# use
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diskdata[2] += int(tokens[12])
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if self.diskstats_ltime:
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# We need to compute information about the time interval
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# since the last sampling and record the result as sample
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# for that point in the past.
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interval = time - self.diskstats_ltime
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if interval > 0:
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sums = [ a - b for a, b in zip(diskdata, self.diskstats_data) ]
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readTput = sums[0] / 2.0 * 100.0 / interval
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writeTput = sums[1] / 2.0 * 100.0 / interval
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util = float( sums[2] ) / 10 / interval
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util = max(0.0, min(1.0, util))
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reduced = (self.diskstats_ltime, (readTput, writeTput, util))
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self.diskstats_ltime = time
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self.diskstats_data = diskdata
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return reduced
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def _reduce_nop(self, time, data):
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return (time, data)
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def _reduce_stat(self, time, data):
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if not data:
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return None
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# CPU times {user, nice, system, idle, io_wait, irq, softirq} from first line
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tokens = data.split(b'\n', 1)[0].split()
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times = [ int(token) for token in tokens[1:] ]
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reduced = None
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if self.stat_ltimes:
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user = float((times[0] + times[1]) - (self.stat_ltimes[0] + self.stat_ltimes[1]))
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system = float((times[2] + times[5] + times[6]) - (self.stat_ltimes[2] + self.stat_ltimes[5] + self.stat_ltimes[6]))
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idle = float(times[3] - self.stat_ltimes[3])
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iowait = float(times[4] - self.stat_ltimes[4])
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aSum = max(user + system + idle + iowait, 1)
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reduced = (time, (user/aSum, system/aSum, iowait/aSum))
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self.stat_ltimes = times
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return reduced
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def sample(self, event, force):
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now = time.time()
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if (now - self.last_proc > self.min_seconds) or force:
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for filename, output, handler in self.proc_files:
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with open(os.path.join('/proc', filename), 'rb') as input:
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data = input.read()
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if handler:
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reduced = handler(now, data)
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else:
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reduced = (now, data)
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if reduced:
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if isinstance(reduced[1], bytes):
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# Use as it is.
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data = reduced[1]
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else:
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# Convert to a single line.
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data = (' '.join([str(x) for x in reduced[1]]) + '\n').encode('ascii')
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# Unbuffered raw write, less overhead and useful
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# in case that we end up with concurrent writes.
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os.write(output.fileno(),
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('%.0f\n' % reduced[0]).encode('ascii') +
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data +
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b'\n')
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self.last_proc = now
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if isinstance(event, bb.event.MonitorDiskEvent) and \
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((now - self.last_disk_monitor > self.min_seconds) or force):
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os.write(self.monitor_disk.fileno(),
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('%.0f\n' % now).encode('ascii') +
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''.join(['%s: %d\n' % (dev, sample.total_bytes - sample.free_bytes)
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for dev, sample in event.disk_usage.items()]).encode('ascii') +
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b'\n')
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self.last_disk_monitor = now
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