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#!/usr/bin/stap
#
# diskdevstat: A simple systemtap script to record harddisk activity
# of processes and display statistics for read/write operations
# Copyright (C) 2008, 2009 Red Hat, Inc.
# Authors: Phil Knirsch
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# 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.
# 51 Franklin Street, Fifth Floor
# Boston, MA 02110-1301, USA.
#
global ifavg, iflast
probe vfs.write
{
if(pid() == 0 || devname == "N/A") {
next;
}
ms = gettimeofday_ms();
if(iflast[0, pid(), devname, execname(), uid()] == 0) {
iflast[0, pid(), devname, execname(), uid()] = ms;
} else {
diff = ms - iflast[0, pid(), devname, execname(), uid()];
iflast[0, pid(), devname, execname(), uid()] = ms;
ifavg[0, pid(), devname, execname(), uid()] <<< diff;
}
}
probe vfs.read
{
if(pid() == 0 || devname == "N/A") {
next;
}
ms = gettimeofday_ms();
if(iflast[1, pid(), devname, execname(), uid()] == 0) {
iflast[1, pid(), devname, execname(), uid()] = ms;
} else {
diff = ms - iflast[1, pid(), devname, execname(), uid()];
iflast[1, pid(), devname, execname(), uid()] = ms;
ifavg[1, pid(), devname, execname(), uid()] <<< diff;
}
}
function print_activity()
{
printf("\033[2J\033[1;1H")
printf("%5s %5s %-7s %9s %9s %9s %9s %9s %9s %9s %9s %-15s\n",
"PID", "UID", "DEV", "WRITE_CNT", "WRITE_MIN", "WRITE_MAX",
"WRITE_AVG", "READ_CNT", "READ_MIN", "READ_MAX", "READ_AVG",
"COMMAND")
foreach ([type, pid, dev, exec, uid] in ifavg-) {
nxmit = @count(ifavg[0, pid, dev, exec, uid])
nrecv = @count(ifavg[1, pid, dev, exec, uid])
write_min = nxmit ? @min(ifavg[0, pid, dev, exec, uid]) : 0
write_max = nxmit ? @max(ifavg[0, pid, dev, exec, uid]) : 0
write_avg = nxmit ? @avg(ifavg[0, pid, dev, exec, uid]) : 0
read_min = nrecv ? @min(ifavg[1, pid, dev, exec, uid]) : 0
read_max = nrecv ? @max(ifavg[1, pid, dev, exec, uid]) : 0
read_avg = nrecv ? @avg(ifavg[1, pid, dev, exec, uid]) : 0
if(type == 0 || nxmit == 0) {
printf("%5d %5d %-7s %9d %5d.%03d %5d.%03d %5d.%03d",
pid, uid, dev, nxmit,
write_min/1000, write_min%1000,
write_max/1000, write_max%1000,
write_avg/1000, write_avg%1000)
printf(" %9d %5d.%03d %5d.%03d %5d.%03d %-15s\n",
nrecv,
read_min/1000, read_min%1000,
read_max/1000, read_max%1000,
read_avg/1000, read_avg%1000,
exec)
}
}
print("\n")
}
probe timer.s(5), end, error
{
print_activity()
}
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