[PATCH 1/4] Import mountstats utility

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The "mountstats" utility is a Python program that extracts and displays NFS
client performance information from /proc/self/mountstats.

Note that if mountstats is named 'ms-nfsstat' or 'ms-iostat' it offers
slightly different functionality.  It needs two man pages and the install
script should provide both commands by installing the script and providing the
other command via a symlink.

Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---

 tools/mountstats/mountstats.py |  584 ++++++++++++++++++++++++++++++++++++++++
 1 files changed, 584 insertions(+), 0 deletions(-)
 create mode 100755 tools/mountstats/mountstats.py


diff --git a/tools/mountstats/mountstats.py b/tools/mountstats/mountstats.py
new file mode 100755
index 0000000..5f20db6
--- /dev/null
+++ b/tools/mountstats/mountstats.py
@@ -0,0 +1,584 @@
+#!/usr/bin/env python
+# -*- python-mode -*-
+"""Parse /proc/self/mountstats and display it in human readable form
+"""
+
+__copyright__ = """
+Copyright (C) 2005, Chuck Lever <cel@xxxxxxxxxx>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License version 2 as
+published by the Free Software Foundation.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+"""
+
+import sys, os, time
+
+Mountstats_version = '0.2'
+
+def difference(x, y):
+    """Used for a map() function
+    """
+    return x - y
+
+class DeviceData:
+    """DeviceData objects provide methods for parsing and displaying
+    data for a single mount grabbed from /proc/self/mountstats
+    """
+    def __init__(self):
+        self.__nfs_data = dict()
+        self.__rpc_data = dict()
+        self.__rpc_data['ops'] = []
+
+    def __parse_nfs_line(self, words):
+        if words[0] == 'device':
+            self.__nfs_data['export'] = words[1]
+            self.__nfs_data['mountpoint'] = words[4]
+            self.__nfs_data['fstype'] = words[7]
+            if words[7].find('nfs') != -1:
+                self.__nfs_data['statvers'] = words[8]
+        elif words[0] == 'age:':
+            self.__nfs_data['age'] = long(words[1])
+        elif words[0] == 'opts:':
+            self.__nfs_data['mountoptions'] = ''.join(words[1:]).split(',')
+        elif words[0] == 'caps:':
+            self.__nfs_data['servercapabilities'] = ''.join(words[1:]).split(',')
+        elif words[0] == 'nfsv4:':
+            self.__nfs_data['nfsv4flags'] = ''.join(words[1:]).split(',')
+        elif words[0] == 'sec:':
+            keys = ''.join(words[1:]).split(',')
+            self.__nfs_data['flavor'] = int(keys[0].split('=')[1])
+            self.__nfs_data['pseudoflavor'] = 0
+            if self.__nfs_data['flavor'] == 6:
+                self.__nfs_data['pseudoflavor'] = int(keys[1].split('=')[1])
+        elif words[0] == 'events:':
+            self.__nfs_data['inoderevalidates'] = int(words[1])
+            self.__nfs_data['dentryrevalidates'] = int(words[2])
+            self.__nfs_data['datainvalidates'] = int(words[3])
+            self.__nfs_data['attrinvalidates'] = int(words[4])
+            self.__nfs_data['syncinodes'] = int(words[5])
+            self.__nfs_data['vfsopen'] = int(words[6])
+            self.__nfs_data['vfslookup'] = int(words[7])
+            self.__nfs_data['vfspermission'] = int(words[8])
+            self.__nfs_data['vfsreadpage'] = int(words[9])
+            self.__nfs_data['vfsreadpages'] = int(words[10])
+            self.__nfs_data['vfswritepage'] = int(words[11])
+            self.__nfs_data['vfswritepages'] = int(words[12])
+            self.__nfs_data['vfsreaddir'] = int(words[13])
+            self.__nfs_data['vfsflush'] = int(words[14])
+            self.__nfs_data['vfsfsync'] = int(words[15])
+            self.__nfs_data['vfslock'] = int(words[16])
+            self.__nfs_data['vfsrelease'] = int(words[17])
+            self.__nfs_data['setattrtrunc'] = int(words[18])
+            self.__nfs_data['extendwrite'] = int(words[19])
+            self.__nfs_data['sillyrenames'] = int(words[20])
+            self.__nfs_data['shortreads'] = int(words[21])
+            self.__nfs_data['shortwrites'] = int(words[22])
+            self.__nfs_data['delay'] = int(words[23])
+        elif words[0] == 'bytes:':
+            self.__nfs_data['normalreadbytes'] = long(words[1])
+            self.__nfs_data['normalwritebytes'] = long(words[2])
+            self.__nfs_data['directreadbytes'] = long(words[3])
+            self.__nfs_data['directwritebytes'] = long(words[4])
+            self.__nfs_data['serverreadbytes'] = long(words[5])
+            self.__nfs_data['serverwritebytes'] = long(words[6])
+
+    def __parse_rpc_line(self, words):
+        if words[0] == 'RPC':
+            self.__rpc_data['statsvers'] = float(words[3])
+            self.__rpc_data['programversion'] = words[5]
+        elif words[0] == 'xprt:':
+            self.__rpc_data['protocol'] = words[1]
+            if words[1] == 'udp':
+                self.__rpc_data['port'] = int(words[2])
+                self.__rpc_data['bind_count'] = int(words[3])
+                self.__rpc_data['rpcsends'] = int(words[4])
+                self.__rpc_data['rpcreceives'] = int(words[5])
+                self.__rpc_data['badxids'] = int(words[6])
+                self.__rpc_data['inflightsends'] = long(words[7])
+                self.__rpc_data['backlogutil'] = long(words[8])
+            elif words[1] == 'tcp':
+                self.__rpc_data['port'] = words[2]
+                self.__rpc_data['bind_count'] = int(words[3])
+                self.__rpc_data['connect_count'] = int(words[4])
+                self.__rpc_data['connect_time'] = int(words[5])
+                self.__rpc_data['idle_time'] = int(words[6])
+                self.__rpc_data['rpcsends'] = int(words[7])
+                self.__rpc_data['rpcreceives'] = int(words[8])
+                self.__rpc_data['badxids'] = int(words[9])
+                self.__rpc_data['inflightsends'] = long(words[10])
+                self.__rpc_data['backlogutil'] = int(words[11])
+        elif words[0] == 'per-op':
+            self.__rpc_data['per-op'] = words
+        else:
+            op = words[0][:-1]
+            self.__rpc_data['ops'] += [op]
+            self.__rpc_data[op] = [long(word) for word in words[1:]]
+
+    def parse_stats(self, lines):
+        """Turn a list of lines from a mount stat file into a 
+        dictionary full of stats, keyed by name
+        """
+        found = False
+        for line in lines:
+            words = line.split()
+            if len(words) == 0:
+                continue
+            if (not found and words[0] != 'RPC'):
+                self.__parse_nfs_line(words)
+                continue
+
+            found = True
+            self.__parse_rpc_line(words)
+
+    def is_nfs_mountpoint(self):
+        """Return True if this is an NFS or NFSv4 mountpoint,
+        otherwise return False
+        """
+        if self.__nfs_data['fstype'] == 'nfs':
+            return True
+        elif self.__nfs_data['fstype'] == 'nfs4':
+            return True
+        return False
+
+    def display_nfs_options(self):
+        """Pretty-print the NFS options
+        """
+        print 'Stats for %s mounted on %s:' % \
+            (self.__nfs_data['export'], self.__nfs_data['mountpoint'])
+
+        print '  NFS mount options: %s' % ','.join(self.__nfs_data['mountoptions'])
+        print '  NFS server capabilities: %s' % ','.join(self.__nfs_data['servercapabilities'])
+        if self.__nfs_data.has_key('nfsv4flags'):
+            print '  NFSv4 capability flags: %s' % ','.join(self.__nfs_data['nfsv4flags'])
+        if self.__nfs_data.has_key('pseudoflavor'):
+            print '  NFS security flavor: %d  pseudoflavor: %d' % \
+                (self.__nfs_data['flavor'], self.__nfs_data['pseudoflavor'])
+        else:
+            print '  NFS security flavor: %d' % self.__nfs_data['flavor']
+
+    def display_nfs_events(self):
+        """Pretty-print the NFS event counters
+        """
+        print
+        print 'Cache events:'
+        print '  data cache invalidated %d times' % self.__nfs_data['datainvalidates']
+        print '  attribute cache invalidated %d times' % self.__nfs_data['attrinvalidates']
+        print '  inodes synced %d times' % self.__nfs_data['syncinodes']
+        print
+        print 'VFS calls:'
+        print '  VFS requested %d inode revalidations' % self.__nfs_data['inoderevalidates']
+        print '  VFS requested %d dentry revalidations' % self.__nfs_data['dentryrevalidates']
+        print
+        print '  VFS called nfs_readdir() %d times' % self.__nfs_data['vfsreaddir']
+        print '  VFS called nfs_lookup() %d times' % self.__nfs_data['vfslookup']
+        print '  VFS called nfs_permission() %d times' % self.__nfs_data['vfspermission']
+        print '  VFS called nfs_file_open() %d times' % self.__nfs_data['vfsopen']
+        print '  VFS called nfs_file_flush() %d times' % self.__nfs_data['vfsflush']
+        print '  VFS called nfs_lock() %d times' % self.__nfs_data['vfslock']
+        print '  VFS called nfs_fsync() %d times' % self.__nfs_data['vfsfsync']
+        print '  VFS called nfs_file_release() %d times' % self.__nfs_data['vfsrelease']
+        print
+        print 'VM calls:'
+        print '  VFS called nfs_readpage() %d times' % self.__nfs_data['vfsreadpage']
+        print '  VFS called nfs_readpages() %d times' % self.__nfs_data['vfsreadpages']
+        print '  VFS called nfs_writepage() %d times' % self.__nfs_data['vfswritepage']
+        print '  VFS called nfs_writepages() %d times' % self.__nfs_data['vfswritepages']
+        print
+        print 'Generic NFS counters:'
+        print '  File size changing operations:'
+        print '    truncating SETATTRs: %d  extending WRITEs: %d' % \
+            (self.__nfs_data['setattrtrunc'], self.__nfs_data['extendwrite'])
+        print '  %d silly renames' % self.__nfs_data['sillyrenames']
+        print '  short reads: %d  short writes: %d' % \
+            (self.__nfs_data['shortreads'], self.__nfs_data['shortwrites'])
+        print '  NFSERR_DELAYs from server: %d' % self.__nfs_data['delay']
+
+    def display_nfs_bytes(self):
+        """Pretty-print the NFS event counters
+        """
+        print
+        print 'NFS byte counts:'
+        print '  applications read %d bytes via read(2)' % self.__nfs_data['normalreadbytes']
+        print '  applications wrote %d bytes via write(2)' % self.__nfs_data['normalwritebytes']
+        print '  applications read %d bytes via O_DIRECT read(2)' % self.__nfs_data['directreadbytes']
+        print '  applications wrote %d bytes via O_DIRECT write(2)' % self.__nfs_data['directwritebytes']
+        print '  client read %d bytes via NFS READ' % self.__nfs_data['serverreadbytes']
+        print '  client wrote %d bytes via NFS WRITE' % self.__nfs_data['serverwritebytes']
+
+    def display_rpc_generic_stats(self):
+        """Pretty-print the generic RPC stats
+        """
+        sends = self.__rpc_data['rpcsends']
+
+        print
+        print 'RPC statistics:'
+
+        print '  %d RPC requests sent, %d RPC replies received (%d XIDs not found)' % \
+            (sends, self.__rpc_data['rpcreceives'], self.__rpc_data['badxids'])
+        if sends != 0:
+            print '  average backlog queue length: %d' % \
+                (float(self.__rpc_data['backlogutil']) / sends)
+
+    def display_rpc_op_stats(self):
+        """Pretty-print the per-op stats
+        """
+        sends = self.__rpc_data['rpcsends']
+
+        # XXX: these should be sorted by 'count'
+        print
+        for op in self.__rpc_data['ops']:
+            stats = self.__rpc_data[op]
+            count = stats[0]
+            retrans = stats[1] - count
+            if count != 0:
+                print '%s:' % op
+                print '\t%d ops (%d%%)' % \
+                    (count, ((count * 100) / sends)),
+                print '\t%d retrans (%d%%)' % (retrans, ((retrans * 100) / count)),
+                print '\t%d major timeouts' % stats[2]
+                print '\tavg bytes sent per op: %d\tavg bytes received per op: %d' % \
+                    (stats[3] / count, stats[4] / count)
+                print '\tbacklog wait: %f' % (float(stats[5]) / count),
+                print '\tRTT: %f' % (float(stats[6]) / count),
+                print '\ttotal execute time: %f (milliseconds)' % \
+                    (float(stats[7]) / count)
+
+    def compare_iostats(self, old_stats):
+        """Return the difference between two sets of stats
+        """
+        result = DeviceData()
+
+        # copy self into result
+        for key, value in self.__nfs_data.iteritems():
+            result.__nfs_data[key] = value
+        for key, value in self.__rpc_data.iteritems():
+            result.__rpc_data[key] = value
+
+        # compute the difference of each item in the list
+        # note the copy loop above does not copy the lists, just
+        # the reference to them.  so we build new lists here
+        # for the result object.
+        for op in result.__rpc_data['ops']:
+            result.__rpc_data[op] = map(difference, self.__rpc_data[op], old_stats.__rpc_data[op])
+
+        # update the remaining keys we care about
+        result.__rpc_data['rpcsends'] -= old_stats.__rpc_data['rpcsends']
+        result.__rpc_data['backlogutil'] -= old_stats.__rpc_data['backlogutil']
+        result.__nfs_data['serverreadbytes'] -= old_stats.__nfs_data['serverreadbytes']
+        result.__nfs_data['serverwritebytes'] -= old_stats.__nfs_data['serverwritebytes']
+
+        return result
+
+    def display_iostats(self, sample_time):
+        """Display NFS and RPC stats in an iostat-like way
+        """
+        sends = float(self.__rpc_data['rpcsends'])
+        if sample_time == 0:
+            sample_time = float(self.__nfs_data['age'])
+
+        print
+        print '%s mounted on %s:' % \
+            (self.__nfs_data['export'], self.__nfs_data['mountpoint'])
+
+        print '\top/s\trpc bklog'
+        print '\t%.2f' % (sends / sample_time), 
+        if sends != 0:
+            print '\t%.2f' % \
+                ((float(self.__rpc_data['backlogutil']) / sends) / sample_time)
+        else:
+            print '\t0.00'
+
+        # reads:  ops/s, Kb/s, avg rtt, and avg exe
+        # XXX: include avg xfer size and retransmits?
+        read_rpc_stats = self.__rpc_data['READ']
+        ops = float(read_rpc_stats[0])
+        kilobytes = float(self.__nfs_data['serverreadbytes']) / 1024
+        rtt = float(read_rpc_stats[6])
+        exe = float(read_rpc_stats[7])
+
+        print '\treads:\tops/s\t\tKb/s\t\tavg RTT (ms)\tavg exe (ms)'
+        print '\t\t%.2f' % (ops / sample_time),
+        print '\t\t%.2f' % (kilobytes / sample_time),
+        if ops != 0:
+            print '\t\t%.2f' % (rtt / ops),
+            print '\t\t%.2f' % (exe / ops)
+        else:
+            print '\t\t0.00',
+            print '\t\t0.00'
+
+        # writes:  ops/s, Kb/s, avg rtt, and avg exe
+        # XXX: include avg xfer size and retransmits?
+        write_rpc_stats = self.__rpc_data['WRITE']
+        ops = float(write_rpc_stats[0])
+        kilobytes = float(self.__nfs_data['serverwritebytes']) / 1024
+        rtt = float(write_rpc_stats[6])
+        exe = float(write_rpc_stats[7])
+
+        print '\twrites:\tops/s\t\tKb/s\t\tavg RTT (ms)\tavg exe (ms)'
+        print '\t\t%.2f' % (ops / sample_time),
+        print '\t\t%.2f' % (kilobytes / sample_time),
+        if ops != 0:
+            print '\t\t%.2f' % (rtt / ops),
+            print '\t\t%.2f' % (exe / ops)
+        else:
+            print '\t\t0.00',
+            print '\t\t0.00'
+
+def parse_stats_file(filename):
+    """pop the contents of a mountstats file into a dictionary,
+    keyed by mount point.  each value object is a list of the
+    lines in the mountstats file corresponding to the mount
+    point named in the key.
+    """
+    ms_dict = dict()
+    key = ''
+
+    f = file(filename)
+    for line in f.readlines():
+        words = line.split()
+        if len(words) == 0:
+            continue
+        if words[0] == 'device':
+            key = words[4]
+            new = [ line.strip() ]
+        else:
+            new += [ line.strip() ]
+        ms_dict[key] = new
+    f.close
+
+    return ms_dict
+
+def print_mountstats_help(name):
+    print 'usage: %s [ options ] <mount point>' % name
+    print
+    print ' Version %s' % Mountstats_version
+    print
+    print ' Display NFS client per-mount statistics.'
+    print
+    print '  --version    display the version of this command'
+    print '  --nfs        display only the NFS statistics'
+    print '  --rpc        display only the RPC statistics'
+    print '  --start      sample and save statistics'
+    print '  --end        resample statistics and compare them with saved'
+    print
+
+def mountstats_command():
+    """Mountstats command
+    """
+    mountpoints = []
+    nfs_only = False
+    rpc_only = False
+
+    for arg in sys.argv:
+        if arg in ['-h', '--help', 'help', 'usage']:
+            print_mountstats_help(prog)
+            return
+
+        if arg in ['-v', '--version', 'version']:
+            print '%s version %s' % (sys.argv[0], Mountstats_version)
+            sys.exit(0)
+
+        if arg in ['-n', '--nfs']:
+            nfs_only = True
+            continue
+
+        if arg in ['-r', '--rpc']:
+            rpc_only = True
+            continue
+
+        if arg in ['-s', '--start']:
+            raise Exception, 'Sampling is not yet implemented'
+
+        if arg in ['-e', '--end']:
+            raise Exception, 'Sampling is not yet implemented'
+
+        if arg == sys.argv[0]:
+            continue
+
+        mountpoints += [arg]
+
+    if mountpoints == []:
+        print_mountstats_help(prog)
+        return
+
+    if rpc_only == True and nfs_only == True:
+        print_mountstats_help(prog)
+        return
+
+    mountstats = parse_stats_file('/proc/self/mountstats')
+
+    for mp in mountpoints:
+        if mp not in mountstats:
+            print 'Statistics for mount point %s not found' % mp
+            continue
+
+        stats = DeviceData()
+        stats.parse_stats(mountstats[mp])
+
+        if not stats.is_nfs_mountpoint():
+            print 'Mount point %s exists but is not an NFS mount' % mp
+            continue
+
+        if nfs_only:
+           stats.display_nfs_options()
+           stats.display_nfs_events()
+           stats.display_nfs_bytes()
+        elif rpc_only:
+           stats.display_rpc_generic_stats()
+           stats.display_rpc_op_stats()
+        else:
+           stats.display_nfs_options()
+           stats.display_nfs_bytes()
+           stats.display_rpc_generic_stats()
+           stats.display_rpc_op_stats()
+
+def print_nfsstat_help(name):
+    print 'usage: %s [ options ]' % name
+    print
+    print ' Version %s' % Mountstats_version
+    print
+    print ' nfsstat-like program that uses NFS client per-mount statistics.'
+    print
+
+def nfsstat_command():
+    print_nfsstat_help(prog)
+
+def print_iostat_help(name):
+    print 'usage: %s [ <interval> [ <count> ] ] [ <mount point> ] ' % name
+    print
+    print ' Version %s' % Mountstats_version
+    print
+    print ' iostat-like program to display NFS client per-mount statistics.'
+    print
+    print ' The <interval> parameter specifies the amount of time in seconds between'
+    print ' each report.  The first report contains statistics for the time since each'
+    print ' file system was mounted.  Each subsequent report contains statistics'
+    print ' collected during the interval since the previous report.'
+    print
+    print ' If the <count> parameter is specified, the value of <count> determines the'
+    print ' number of reports generated at <interval> seconds apart.  If the interval'
+    print ' parameter is specified without the <count> parameter, the command generates'
+    print ' reports continuously.'
+    print
+    print ' If one or more <mount point> names are specified, statistics for only these'
+    print ' mount points will be displayed.  Otherwise, all NFS mount points on the'
+    print ' client are listed.'
+    print
+
+def print_iostat_summary(old, new, devices, time):
+    for device in devices:
+        stats = DeviceData()
+        stats.parse_stats(new[device])
+        if not old:
+            stats.display_iostats(time)
+        else:
+            old_stats = DeviceData()
+            old_stats.parse_stats(old[device])
+            diff_stats = stats.compare_iostats(old_stats)
+            diff_stats.display_iostats(time)
+
+def iostat_command():
+    """iostat-like command for NFS mount points
+    """
+    mountstats = parse_stats_file('/proc/self/mountstats')
+    devices = []
+    interval_seen = False
+    count_seen = False
+
+    for arg in sys.argv:
+        if arg in ['-h', '--help', 'help', 'usage']:
+            print_iostat_help(prog)
+            return
+
+        if arg in ['-v', '--version', 'version']:
+            print '%s version %s' % (sys.argv[0], Mountstats_version)
+            return
+
+        if arg == sys.argv[0]:
+            continue
+
+        if arg in mountstats:
+            devices += [arg]
+        elif not interval_seen:
+            interval = int(arg)
+            if interval > 0:
+                interval_seen = True
+            else:
+                print 'Illegal <interval> value'
+                return
+        elif not count_seen:
+            count = int(arg)
+            if count > 0:
+                count_seen = True
+            else:
+                print 'Illegal <count> value'
+                return
+
+    # make certain devices contains only NFS mount points
+    if len(devices) > 0:
+        check = []
+        for device in devices:
+            stats = DeviceData()
+            stats.parse_stats(mountstats[device])
+            if stats.is_nfs_mountpoint():
+                check += [device]
+        devices = check
+    else:
+        for device, descr in mountstats.iteritems():
+            stats = DeviceData()
+            stats.parse_stats(descr)
+            if stats.is_nfs_mountpoint():
+                devices += [device]
+    if len(devices) == 0:
+        print 'No NFS mount points were found'
+        return
+
+    old_mountstats = None
+    sample_time = 0
+
+    if not interval_seen:
+        print_iostat_summary(old_mountstats, mountstats, devices, sample_time)
+        return
+
+    if count_seen:
+        while count != 0:
+            print_iostat_summary(old_mountstats, mountstats, devices, sample_time)
+            old_mountstats = mountstats
+            time.sleep(interval)
+            sample_time = interval
+            mountstats = parse_stats_file('/proc/self/mountstats')
+            count -= 1
+    else: 
+        while True:
+            print_iostat_summary(old_mountstats, mountstats, devices, sample_time)
+            old_mountstats = mountstats
+            time.sleep(interval)
+            sample_time = interval
+            mountstats = parse_stats_file('/proc/self/mountstats')
+
+#
+# Main
+#
+prog = os.path.basename(sys.argv[0])
+
+try:
+    if prog == 'mountstats':
+        mountstats_command()
+    elif prog == 'ms-nfsstat':
+        nfsstat_command()
+    elif prog == 'ms-iostat':
+        iostat_command()
+except KeyboardInterrupt:
+    print 'Caught ^C... exiting'
+    sys.exit(1)
+
+sys.exit(0)

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