Rob Gardner
2006-Apr-13 21:41 UTC
[Xen-devel] [PATCH]Non-polling trace record access, userland tools
This is a patch for XenMon which only applies to the userspace tools.
The primary purpose of this patch is to add support for non-polling
access to the xen trace buffers. The hypervisor changes have already
been accepted.
Also included are a few bug fixes and some minor new features:
1. If xenmon is run without first allocating trace buffers (via
''setsize'') and enabling them (via ''tbctl''),
then this is done
automatically using sensible defaults.
2. There was a bug that caused the first second''s worth of data output
from xenmon to be erroneous; This has been fixed.
3. There was a bug that caused xenmon to sometimes not display data for
newly created domains; This has also been fixed.
4. The xenmon display has a ''heartbeat'' which flickers once
per second.
This is to show that xenmon is still alive, even though the display
isn''t changing at all, a situation that can happen sometimes when there
is nothing at all happening on a particular cpu.
5. Added cpu utilization display to the top of the xenmon window.
6. Added a bunch of options in xenmon to control exactly which metrics
are displayed, so the screen doesn''t get cluttered with stuff
you''re not
interested in. The new options are:
--allocated
--noallocated
--blocked
--noblocked
--waited
--nowaited
--excount
--noexcount
--iocount
--noiocount
7. Added an option ("--cpu=N") to xenmon to specify which physical cpu
you''d like data displayed for.
8. Updated the README with information about default trace buffer size, etc.
Rob Gardner
# HG changeset patch
# User rob.gardner@hp.com
# Node ID 2c7f48f6b48cb7eb615170cf9cf3293c2da09764
# Parent edefe24d78bd5e6e51bdd002f3ee7721d6dc2ce5
Add support for non-polling trace buffer access; Also fix some bugs and
add a few new features.
Signed-off-by: Rob Gardner <rob.gardner@hp.com>
diff -r edefe24d78bd -r 2c7f48f6b48c tools/xenmon/xenbaked.h
--- a/tools/xenmon/xenbaked.h Tue Apr 11 11:51:48 2006
+++ b/tools/xenmon/xenbaked.h Thu Apr 13 21:31:50 2006
@@ -1,5 +1,5 @@
/******************************************************************************
- * tools/xenbaked.h
+ * TOOLS/xenbaked.h
*
* Header file for xenbaked
*
@@ -30,6 +30,7 @@
#define million 1000000LL
#define billion 1000000000LL
+// caution: don''t use QOS_ADD with negative numbers!
#define QOS_ADD(N,A) ((N+A)<(NSAMPLES-1) ? (N+A) : A)
#define QOS_INCR(N) ((N<(NSAMPLES-2)) ? (N+1) : 0)
#define QOS_DECR(N) ((N==0) ? (NSAMPLES-1) : (N-1))
@@ -43,6 +44,8 @@
/* Number of data points to keep */
#define NSAMPLES 100
+#define ID(X) ((X>NDOMAINS-1)?(NDOMAINS-1):X)
+#define DEFAULT_TBUF_SIZE 20
// per domain stuff
typedef struct
diff -r edefe24d78bd -r 2c7f48f6b48c tools/xenmon/xenmon.py
--- a/tools/xenmon/xenmon.py Tue Apr 11 11:51:48 2006
+++ b/tools/xenmon/xenmon.py Thu Apr 13 21:31:50 2006
@@ -5,7 +5,7 @@
# There is a curses interface for live monitoring. XenMon also allows
# logging to a file. For options, run python xenmon.py -h
#
-# Copyright (C) 2005 by Hewlett Packard, Palo Alto and Fort Collins
+# Copyright (C) 2005,2006 by Hewlett Packard, Palo Alto and Fort Collins
# Authors: Lucy Cherkasova, lucy.cherkasova@hp.com
# Rob Gardner, rob.gardner@hp.com
# Diwaker Gupta, diwaker.gupta@hp.com
@@ -85,6 +85,33 @@
parser.add_option("--ms_per_sample",
dest="mspersample",
action="store", type="int", default=100,
help = "determines how many ms worth of data goes in a
sample")
+ parser.add_option("--cpu", dest="cpu",
action="store", type="int",
default=0,
+ help = "specifies which cpu to display data for")
+
+ parser.add_option("--allocated", dest="allocated",
action="store_true",
+ default=False, help="Display allocated time for
each domain")
+ parser.add_option("--noallocated", dest="allocated",
action="store_false",
+ default=False, help="Don''t display
allocated time
for each domain")
+
+ parser.add_option("--blocked", dest="blocked",
action="store_true",
+ default=True, help="Display blocked time for each
domain")
+ parser.add_option("--noblocked", dest="blocked",
action="store_false",
+ default=True, help="Don''t display blocked
time
for each domain")
+
+ parser.add_option("--waited", dest="waited",
action="store_true",
+ default=True, help="Display waiting time for each
domain")
+ parser.add_option("--nowaited", dest="waited",
action="store_false",
+ default=True, help="Don''t display waiting
time
for each domain")
+
+ parser.add_option("--excount", dest="excount",
action="store_true",
+ default=False, help="Display execution count for
each domain")
+ parser.add_option("--noexcount", dest="excount",
action="store_false",
+ default=False, help="Don''t display
execution
count for each domain")
+ parser.add_option("--iocount", dest="iocount",
action="store_true",
+ default=False, help="Display I/O count for each
domain")
+ parser.add_option("--noiocount", dest="iocount",
action="store_false",
+ default=False, help="Don''t display I/O
count for
each domain")
+
return parser
# encapsulate information about a domain
@@ -227,19 +254,17 @@
# the live monitoring code
-def show_livestats():
- cpu = 0 # cpu of interest to display data for
+def show_livestats(cpu):
ncpu = 1 # number of cpu''s on this platform
slen = 0 # size of shared data structure, incuding padding
- global dom_in_use
+ cpu_1sec_usage = 0.0
+ cpu_10sec_usage = 0.0
+ heartbeat = 1
+ global dom_in_use, options
# mmap the (the first chunk of the) file
shmf = open(SHM_FILE, "r+")
shm = mmap.mmap(shmf.fileno(), QOS_DATA_SIZE)
-
- samples = []
- doms = []
- dom_in_use = []
# initialize curses
stdscr = _c.initscr()
@@ -253,7 +278,8 @@
# display in a loop
while True:
- for cpuidx in range(0, ncpu):
+ cpuidx = 0
+ while cpuidx < ncpu:
# calculate offset in mmap file to start from
idx = cpuidx * slen
@@ -261,6 +287,7 @@
samples = []
doms = []
+ dom_in_use = []
# read in data
for i in range(0, NSAMPLES):
@@ -279,6 +306,8 @@
# dom_in_use.append(in_use)
dom_in_use.append(dom[8])
idx += len
+# print "dom_in_use(cpu=%d): " % cpuidx, dom_in_use
+
len = struct.calcsize("4i")
oldncpu = ncpu
@@ -294,6 +323,8 @@
# stop examining mmap data and start displaying stuff
if cpuidx == cpu:
break
+
+ cpuidx = cpuidx + 1
# calculate starting and ending datapoints; never look at
"next" since
# it represents live data that may be in transition.
@@ -312,12 +343,15 @@
row = 0
display(stdscr, row, 1, "CPU = %d" % cpu, _c.A_STANDOUT)
- display(stdscr, row, 10, "%sLast 10 seconds%sLast 1 second" %
(6*'' '', 30*'' ''), _c.A_BOLD)
+ display(stdscr, row, 10, "%sLast 10 seconds (%3.2f%%)%sLast 1
second (%3.2f%%)" % (6*'' '', cpu_10sec_usage,
30*'' '', cpu_1sec_usage),
_c.A_BOLD)
row +=1
display(stdscr, row, 1, "%s" %
((maxx-2)*''=''))
total_h1_cpu = 0
total_h2_cpu = 0
+
+ cpu_1sec_usage = 0.0
+ cpu_10sec_usage = 0.0
for dom in range(0, NDOMAINS):
if not dom_in_use[dom]:
@@ -332,92 +366,102 @@
display(stdscr, row, col, "%s" %
time_scale(h2[dom][0][0]))
col += 12
display(stdscr, row, col, "%3.2f%%" % h2[dom][0][1])
+ if dom != NDOMAINS - 1:
+ cpu_10sec_usage += h2[dom][0][1]
col += 12
display(stdscr, row, col, "%s/ex" %
time_scale(h2[dom][0][2]))
col += 18
display(stdscr, row, col, "%s" %
time_scale(h1[dom][0][0]))
col += 12
- display(stdscr, row, col, "%3.2f%%" % h1[dom][0][1])
+ display(stdscr, row, col, "%3.2f%%" % h1[dom][0][1],
_c.A_STANDOUT)
col += 12
display(stdscr, row, col, "%s/ex" %
time_scale(h1[dom][0][2]))
col += 18
display(stdscr, row, col, "Gotten")
+
+ if dom != NDOMAINS - 1:
+ cpu_1sec_usage = cpu_1sec_usage + h1[dom][0][1]
# display allocated
- row += 1
- col = 2
- display(stdscr, row, col, "%d" % dom)
- col += 28
- display(stdscr, row, col, "%s/ex" %
time_scale(h2[dom][1]))
- col += 42
- display(stdscr, row, col, "%s/ex" %
time_scale(h1[dom][1]))
- col += 18
- display(stdscr, row, col, "Allocated")
+ if options.allocated:
+ row += 1
+ col = 2
+ display(stdscr, row, col, "%d" % dom)
+ col += 28
+ display(stdscr, row, col, "%s/ex" %
time_scale(h2[dom][1]))
+ col += 42
+ display(stdscr, row, col, "%s/ex" %
time_scale(h1[dom][1]))
+ col += 18
+ display(stdscr, row, col, "Allocated")
# display blocked
- row += 1
- col = 2
- display(stdscr, row, col, "%d" % dom)
- col += 4
- display(stdscr, row, col, "%s" %
time_scale(h2[dom][2][0]))
- col += 12
- display(stdscr, row, col, "%3.2f%%" % h2[dom][2][1])
- col += 12
- display(stdscr, row, col, "%s/io" %
time_scale(h2[dom][2][2]))
- col += 18
- display(stdscr, row, col, "%s" %
time_scale(h1[dom][2][0]))
- col += 12
- display(stdscr, row, col, "%3.2f%%" % h1[dom][2][1])
- col += 12
- display(stdscr, row, col, "%s/io" %
time_scale(h1[dom][2][2]))
- col += 18
- display(stdscr, row, col, "Blocked")
+ if options.blocked:
+ row += 1
+ col = 2
+ display(stdscr, row, col, "%d" % dom)
+ col += 4
+ display(stdscr, row, col, "%s" %
time_scale(h2[dom][2][0]))
+ col += 12
+ display(stdscr, row, col, "%3.2f%%" %
h2[dom][2][1])
+ col += 12
+ display(stdscr, row, col, "%s/io" %
time_scale(h2[dom][2][2]))
+ col += 18
+ display(stdscr, row, col, "%s" %
time_scale(h1[dom][2][0]))
+ col += 12
+ display(stdscr, row, col, "%3.2f%%" %
h1[dom][2][1])
+ col += 12
+ display(stdscr, row, col, "%s/io" %
time_scale(h1[dom][2][2]))
+ col += 18
+ display(stdscr, row, col, "Blocked")
# display waited
- row += 1
- col = 2
- display(stdscr, row, col, "%d" % dom)
- col += 4
- display(stdscr, row, col, "%s" %
time_scale(h2[dom][3][0]))
- col += 12
- display(stdscr, row, col, "%3.2f%%" % h2[dom][3][1])
- col += 12
- display(stdscr, row, col, "%s/ex" %
time_scale(h2[dom][3][2]))
- col += 18
- display(stdscr, row, col, "%s" %
time_scale(h1[dom][3][0]))
- col += 12
- display(stdscr, row, col, "%3.2f%%" % h1[dom][3][1])
- col += 12
- display(stdscr, row, col, "%s/ex" %
time_scale(h1[dom][3][2]))
- col += 18
- display(stdscr, row, col, "Waited")
+ if options.waited:
+ row += 1
+ col = 2
+ display(stdscr, row, col, "%d" % dom)
+ col += 4
+ display(stdscr, row, col, "%s" %
time_scale(h2[dom][3][0]))
+ col += 12
+ display(stdscr, row, col, "%3.2f%%" %
h2[dom][3][1])
+ col += 12
+ display(stdscr, row, col, "%s/ex" %
time_scale(h2[dom][3][2]))
+ col += 18
+ display(stdscr, row, col, "%s" %
time_scale(h1[dom][3][0]))
+ col += 12
+ display(stdscr, row, col, "%3.2f%%" %
h1[dom][3][1])
+ col += 12
+ display(stdscr, row, col, "%s/ex" %
time_scale(h1[dom][3][2]))
+ col += 18
+ display(stdscr, row, col, "Waited")
# display ex count
- row += 1
- col = 2
- display(stdscr, row, col, "%d" % dom)
-
- col += 28
- display(stdscr, row, col, "%d/s" % h2[dom][4])
- col += 42
- display(stdscr, row, col, "%d" % h1[dom][4])
- col += 18
- display(stdscr, row, col, "Execution count")
+ if options.excount:
+ row += 1
+ col = 2
+ display(stdscr, row, col, "%d" % dom)
+
+ col += 28
+ display(stdscr, row, col, "%d/s" % h2[dom][4])
+ col += 42
+ display(stdscr, row, col, "%d" % h1[dom][4])
+ col += 18
+ display(stdscr, row, col, "Execution count")
# display io count
- row += 1
- col = 2
- display(stdscr, row, col, "%d" % dom)
- col += 4
- display(stdscr, row, col, "%d/s" % h2[dom][5][0])
- col += 24
- display(stdscr, row, col, "%d/ex" % h2[dom][5][1])
- col += 18
- display(stdscr, row, col, "%d" % h1[dom][5][0])
- col += 24
- display(stdscr, row, col, "%3.2f/ex" % h1[dom][5][1])
- col += 18
- display(stdscr, row, col, "I/O Count")
+ if options.iocount:
+ row += 1
+ col = 2
+ display(stdscr, row, col, "%d" % dom)
+ col += 4
+ display(stdscr, row, col, "%d/s" % h2[dom][5][0])
+ col += 24
+ display(stdscr, row, col, "%d/ex" %
h2[dom][5][1])
+ col += 18
+ display(stdscr, row, col, "%d" % h1[dom][5][0])
+ col += 24
+ display(stdscr, row, col, "%3.2f/ex" %
h1[dom][5][1])
+ col += 18
+ display(stdscr, row, col, "I/O Count")
#row += 1
#stdscr.hline(row, 1, ''-'', maxx - 2)
@@ -426,6 +470,9 @@
row += 1
+ star = heartbeat * ''*''
+ heartbeat = 1 - heartbeat
+ display(stdscr, row, 1, star)
display(stdscr, row, 2, TOTALS % (total_h2_cpu, total_h1_cpu))
row += 1
# display(stdscr, row, 2,
@@ -515,10 +562,10 @@
outfiles[dom].delayed_write("# passed cpu dom cpu(tot) cpu(%)
cpu/ex allocated/ex blocked(tot) blocked(%) blocked/io waited(tot)
waited(%) waited/ex ex/s io(tot) io/ex\n")
while options.duration == 0 or interval < (options.duration * 1000):
- for cpuidx in range(0, ncpu):
+ cpuidx = 0
+ while cpuidx < ncpu:
idx = cpuidx * slen # offset needed in mmap file
-
samples = []
doms = []
@@ -571,6 +618,7 @@
curr = time.time()
interval += (curr - last) * 1000
last = curr
+ cpuidx = cpuidx + 1
time.sleep(options.interval / 1000.0)
for dom in range(0, NDOMAINS):
@@ -601,7 +649,7 @@
start_xenbaked()
if options.live:
- show_livestats()
+ show_livestats(options.cpu)
else:
try:
writelog()
diff -r edefe24d78bd -r 2c7f48f6b48c tools/xenmon/xenbaked.c
--- a/tools/xenmon/xenbaked.c Tue Apr 11 11:51:48 2006
+++ b/tools/xenmon/xenbaked.c Thu Apr 13 21:31:50 2006
@@ -7,6 +7,7 @@
*
* Copyright (C) 2004 by Intel Research Cambridge
* Copyright (C) 2005 by Hewlett Packard, Palo Alto and Fort Collins
+ * Copyright (C) 2006 by Hewlett Packard Fort Collins
*
* Authors: Diwaker Gupta, diwaker.gupta@hp.com
* Rob Gardner, rob.gardner@hp.com
@@ -42,6 +43,8 @@
#include <xenctrl.h>
#include <xen/xen.h>
#include <string.h>
+#include <sys/select.h>
+#include <xen/linux/evtchn.h>
#include "xc_private.h"
typedef struct { int counter; } atomic_t;
@@ -81,14 +84,13 @@
int interrupted = 0; /* gets set if we get a SIGHUP */
int rec_count = 0;
+int wakeups = 0;
time_t start_time;
int dom0_flips = 0;
_new_qos_data *new_qos;
_new_qos_data **cpu_qos_data;
-
-#define ID(X) ((X>NDOMAINS-1)?(NDOMAINS-1):X)
// array of currently running domains, indexed by cpu
int *running = NULL;
@@ -223,6 +225,9 @@
printf("processed %d total records in %d seconds (%ld per
second)\n",
rec_count, (int)run_time, rec_count/run_time);
+ printf("woke up %d times in %d seconds (%ld per second)\n",
wakeups,
+ (int) run_time, wakeups/run_time);
+
check_gotten_sum();
}
@@ -243,6 +248,112 @@
stat_map[0].event_count++; // other
}
+#define EVTCHN_DEV_NAME "/dev/xen/evtchn"
+#define EVTCHN_DEV_MAJOR 10
+#define EVTCHN_DEV_MINOR 201
+
+int virq_port;
+int eventchn_fd = -1;
+
+/* Returns the event channel handle. */
+/* Stolen from xenstore code */
+int eventchn_init(void)
+{
+ struct stat st;
+ struct ioctl_evtchn_bind_virq bind;
+ int rc;
+
+ // to revert to old way:
+ if (0)
+ return -1;
+
+ /* Make sure any existing device file links to correct device. */
+ if ((lstat(EVTCHN_DEV_NAME, &st) != 0) || !S_ISCHR(st.st_mode) ||
+ (st.st_rdev != makedev(EVTCHN_DEV_MAJOR, EVTCHN_DEV_MINOR)))
+ (void)unlink(EVTCHN_DEV_NAME);
+
+ reopen:
+ eventchn_fd = open(EVTCHN_DEV_NAME, O_NONBLOCK|O_RDWR);
+ if (eventchn_fd == -1) {
+ if ((errno == ENOENT) &&
+ ((mkdir("/dev/xen", 0755) == 0) || (errno == EEXIST)) &&
+ (mknod(EVTCHN_DEV_NAME, S_IFCHR|0600,
+ makedev(EVTCHN_DEV_MAJOR, EVTCHN_DEV_MINOR)) == 0))
+ goto reopen;
+ return -errno;
+ }
+
+ if (eventchn_fd < 0)
+ perror("Failed to open evtchn device");
+
+ bind.virq = VIRQ_TBUF;
+ rc = ioctl(eventchn_fd, IOCTL_EVTCHN_BIND_VIRQ, &bind);
+ if (rc == -1)
+ perror("Failed to bind to domain exception virq port");
+ virq_port = rc;
+
+ return eventchn_fd;
+}
+
+void wait_for_event(void)
+{
+ int ret;
+ fd_set inset;
+ evtchn_port_t port;
+ struct timeval tv;
+
+ if (eventchn_fd < 0) {
+ nanosleep(&opts.poll_sleep, NULL);
+ return;
+ }
+
+ FD_ZERO(&inset);
+ FD_SET(eventchn_fd, &inset);
+ tv.tv_sec = 1;
+ tv.tv_usec = 0;
+ // tv = millis_to_timespec(&opts.poll_sleep);
+ ret = select(eventchn_fd+1, &inset, NULL, NULL, &tv);
+
+ if ( (ret == 1) && FD_ISSET(eventchn_fd, &inset)) {
+ if (read(eventchn_fd, &port, sizeof(port)) != sizeof(port))
+ perror("Failed to read from event fd");
+
+ // if (port == virq_port)
+ // printf("got the event I was looking for\r\n");
+
+ if (write(eventchn_fd, &port, sizeof(port)) != sizeof(port))
+ perror("Failed to write to event fd");
+ }
+}
+
+void enable_tracing_or_die(int xc_handle)
+{
+ int enable = 1;
+ int tbsize = DEFAULT_TBUF_SIZE;
+
+ if (xc_tbuf_enable(xc_handle, enable) != 0) {
+ if (xc_tbuf_set_size(xc_handle, tbsize) != 0) {
+ perror("set_size Hypercall failure");
+ exit(1);
+ }
+ printf("Set default trace buffer allocation (%d pages)\n",
tbsize);
+ if (xc_tbuf_enable(xc_handle, enable) != 0) {
+ perror("Could not enable trace buffers\n");
+ exit(1);
+ }
+ }
+ else
+ printf("Tracing enabled\n");
+}
+
+void disable_tracing(void)
+{
+ int enable = 0;
+ int xc_handle = xc_interface_open();
+
+ xc_tbuf_enable(xc_handle, enable);
+ xc_interface_close(xc_handle);
+}
/**
@@ -258,6 +369,17 @@
int ret;
dom0_op_t op; /* dom0 op we''ll
build */
int xc_handle = xc_interface_open(); /* for accessing control
interface */
+ unsigned int tbsize;
+
+ enable_tracing_or_die(xc_handle);
+
+ if (xc_tbuf_get_size(xc_handle, &tbsize) != 0) {
+ perror("Failure to get tbuf info from Xen. Guess size is 0?");
+ exit(1);
+ }
+ else
+ printf("Current tbuf size: 0x%x\n", tbsize);
+
op.cmd = DOM0_TBUFCONTROL;
op.interface_version = DOM0_INTERFACE_VERSION;
@@ -448,6 +570,11 @@
meta = init_bufs_ptrs (tbufs_mapped, num, size);
data = init_rec_ptrs(meta, num);
+ // Set up event channel for select()
+ if (eventchn_init() < 0) {
+ fprintf(stderr, "Failed to initialize event channel; Using POLL
method\r\n");
+ }
+
/* now, scan buffers for events */
while ( !interrupted )
{
@@ -460,7 +587,8 @@
meta[i]->cons++;
}
- nanosleep(&opts.poll_sleep, NULL);
+ wait_for_event();
+ wakeups++;
}
/* cleanup */
@@ -640,6 +768,7 @@
dump_stats();
msync(new_qos, sizeof(_new_qos_data), MS_SYNC);
+ disable_tracing();
return ret;
}
@@ -737,7 +866,9 @@
start = new_qos->domain_info[id].start_time;
if (start > now) { // wrapped around
run_time = now + (~0ULL - start);
- printf("warning: start > now\n");
+ // this could happen if there is nothing going on within a cpu;
+ // in this case the idle domain would run forever
+ // printf("warning: start > now\n");
}
else
run_time = now - start;
@@ -746,11 +877,11 @@
new_qos->domain_info[id].ns_oncpu_since_boot += run_time;
new_qos->domain_info[id].start_time = now;
new_qos->domain_info[id].ns_since_boot += time_since_update;
-#if 1
+
new_qos->qdata[n].ns_gotten[id] += run_time;
- if (domid == 0 && cpu == 1)
- printf("adding run time for dom0 on cpu1\r\n");
-#endif
+ // if (domid == 0 && cpu == 1)
+ // printf("adding run time for dom0 on cpu1\r\n");
+
}
new_qos->domain_info[id].runnable_at_last_update =
domain_runnable(domid);
@@ -916,13 +1047,13 @@
{
int id = ID(domid);
+ qos_update_thread_stats(cpu, domid, now);
+
if (domain_runnable(id)) // double call?
return;
new_qos->domain_info[id].runnable = 1;
update_blocked_time(domid, now);
- qos_update_thread_stats(cpu, domid, now);
-
new_qos->domain_info[id].blocked_start_time = 0; /* invalidate */
new_qos->domain_info[id].runnable_start_time = now;
// runnable_start_time[id] = now;
@@ -951,7 +1082,7 @@
if (domid == IDLE_DOMAIN_ID)
domid = NDOMAINS-1;
if (domid < 0 || domid >= NDOMAINS) {
- printf("bad domain id: %d\n", domid);
+ printf("bad domain id: %d\r\n", domid);
return 0;
}
if (new_qos->domain_info[domid].in_use == 0)
diff -r edefe24d78bd -r 2c7f48f6b48c tools/xenmon/README
--- a/tools/xenmon/README Tue Apr 11 11:51:48 2006
+++ b/tools/xenmon/README Thu Apr 13 21:31:50 2006
@@ -84,6 +84,16 @@
events cause a trace record to be emitted.
- To exit xenmon, type ''q''
- To cycle the display to other physical cpu''s, type
''c''
+ - The first time xenmon is run, it attempts to allocate xen trace buffers
+ using a default size. If you wish to use a non-default value for the
+ trace buffer size, run the ''setsize'' program (located in
tools/xentrace)
+ and specify the number of memory pages as a parameter. The default
is 20.
+ - Not well tested with domains using more than 1 virtual cpu
+ - If you create a lot of domains, or repeatedly kill a domain and
restart it,
+ and the domain id''s get to be bigger than NDOMAINS, then xenmon
behaves badly.
+ This is a bug that is due to xenbaked''s treatment of domain
id''s vs.
domain
+ indices in a data array. Will be fixed in a future release; Workaround:
+ Increase NDOMAINS in xenbaked and rebuild.
Future Work
-----------
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