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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2] tools: set migration constraints from cmdline
# HG changeset patch
# User Olaf Hering <olaf@xxxxxxxxx>
# Date 1359563423 -3600
# Node ID e44917a64f31036dccb81864e942c49e3a36cab5
# Parent 6727070b4129cf852199b66b6a81042ee6966a98
tools: set migration constraints from cmdline
Add new options to xm/xl migrate to control the process of migration.
The intention is to optionally abort the migration if it takes too long
to migrate a busy guest due to the high number of dirty pages. Currently
the guest is suspended to transfer the remaining dirty pages. This
transfer can take too long, which can confuse the guest if its suspended
for too long.
-M <number> Number of iterations before final suspend (default: 30)
--max_iters <number>
-m <factor> Max amount of memory to transfer before final suspend (default:
3*RAM)
--max_factor <factor>
-N Abort migration instead of doing final suspend.
--no_suspend
A variant of this change has been tested with xend, the patch below is
only compile tested. The changes to libxl change the API, is that
approach acceptable?
v2:
- use LIBXL_API_VERSION and define libxl_domain_suspend_0x040200
- fix logic error in min_reached check in xc_domain_save
- add longopts
- update --help text
- correct description of migrate --help text
Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
diff -r 6727070b4129 -r e44917a64f31 tools/libxc/xc_domain_save.c
--- a/tools/libxc/xc_domain_save.c
+++ b/tools/libxc/xc_domain_save.c
@@ -43,6 +43,8 @@
*/
#define DEF_MAX_ITERS 29 /* limit us to 30 times round loop */
#define DEF_MAX_FACTOR 3 /* never send more than 3x p2m_size */
+/* Suspend guest for final transit once number of dirty pages is that low */
+#define DEF_MIN_REMAINING 50
struct save_ctx {
unsigned long hvirt_start; /* virtual starting address of the hypervisor */
@@ -804,6 +806,7 @@ int xc_domain_save(xc_interface *xch, in
int rc = 1, frc, i, j, last_iter = 0, iter = 0;
int live = (flags & XCFLAGS_LIVE);
int debug = (flags & XCFLAGS_DEBUG);
+ int no_suspend = (flags & XCFLAGS_DOMSAVE_NOSUSPEND);
int superpages = !!hvm;
int race = 0, sent_last_iter, skip_this_iter = 0;
unsigned int sent_this_iter = 0;
@@ -1525,10 +1528,20 @@ int xc_domain_save(xc_interface *xch, in
if ( live )
{
+ int min_reached = sent_this_iter + skip_this_iter <
DEF_MIN_REMAINING;
if ( (iter >= max_iters) ||
- (sent_this_iter+skip_this_iter < 50) ||
+ min_reached ||
(total_sent > dinfo->p2m_size*max_factor) )
{
+ if ( !min_reached && no_suspend )
+ {
+ ERROR("Live migration aborted, as requested. (guest too
busy?)"
+ " total_sent %lu iter %d, max_iters %u max_factor %u",
+ total_sent, iter, max_iters, max_factor);
+ rc = 1;
+ goto out;
+ }
+
DPRINTF("Start last iteration\n");
last_iter = 1;
diff -r 6727070b4129 -r e44917a64f31 tools/libxc/xenguest.h
--- a/tools/libxc/xenguest.h
+++ b/tools/libxc/xenguest.h
@@ -28,6 +28,8 @@
#define XCFLAGS_HVM 4
#define XCFLAGS_STDVGA 8
#define XCFLAGS_CHECKPOINT_COMPRESS 16
+#define XCFLAGS_DOMSAVE_NOSUSPEND 32
+
#define X86_64_B_SIZE 64
#define X86_32_B_SIZE 32
diff -r 6727070b4129 -r e44917a64f31 tools/libxl/libxl.c
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -756,7 +756,8 @@ static void domain_suspend_cb(libxl__egc
}
-int libxl_domain_suspend(libxl_ctx *ctx, uint32_t domid, int fd, int flags,
+static int __libxl_domain_suspend(libxl_ctx *ctx, uint32_t domid, int fd,
+ int flags, int max_iters, int max_factor,
const libxl_asyncop_how *ao_how)
{
AO_CREATE(ctx, domid, ao_how);
@@ -779,6 +780,9 @@ int libxl_domain_suspend(libxl_ctx *ctx,
dss->type = type;
dss->live = flags & LIBXL_SUSPEND_LIVE;
dss->debug = flags & LIBXL_SUSPEND_DEBUG;
+ dss->max_iters = max_iters;
+ dss->max_factor = max_factor;
+ dss->xlflags = flags;
libxl__domain_suspend(egc, dss);
return AO_INPROGRESS;
@@ -787,6 +791,20 @@ int libxl_domain_suspend(libxl_ctx *ctx,
return AO_ABORT(rc);
}
+int libxl_domain_suspend_0x040200(libxl_ctx *ctx, uint32_t domid, int fd,
+ int flags, const libxl_asyncop_how *ao_how)
+{
+ return __libxl_domain_suspend(ctx, domid, fd, flags, 0,0, ao_how);
+}
+
+int libxl_domain_suspend(libxl_ctx *ctx, uint32_t domid, int fd, int flags,
+ int max_iters, int max_factor,
+ const libxl_asyncop_how *ao_how)
+{
+ return __libxl_domain_suspend(ctx, domid, fd, flags, max_iters,
+ max_factor, ao_how);
+}
+
int libxl_domain_pause(libxl_ctx *ctx, uint32_t domid)
{
int ret;
diff -r 6727070b4129 -r e44917a64f31 tools/libxl/libxl.h
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -500,12 +500,25 @@ int libxl_domain_create_restore(libxl_ct
void libxl_domain_config_init(libxl_domain_config *d_config);
void libxl_domain_config_dispose(libxl_domain_config *d_config);
-int libxl_domain_suspend(libxl_ctx *ctx, uint32_t domid, int fd,
+#ifdef LIBXL_API_VERSION
+#if LIBXL_API_VERSION == 0x040200
+#define libxl_domain_suspend libxl_domain_suspend_0x040200
+int libxl_domain_suspend_0x040200(libxl_ctx *ctx, uint32_t domid, int fd,
int flags, /* LIBXL_SUSPEND_* */
const libxl_asyncop_how *ao_how)
LIBXL_EXTERNAL_CALLERS_ONLY;
+#endif
+#else
+int libxl_domain_suspend(libxl_ctx *ctx, uint32_t domid, int fd,
+ int flags, /* LIBXL_SUSPEND_* */
+ int max_iters, int max_factor,
+ const libxl_asyncop_how *ao_how)
+ LIBXL_EXTERNAL_CALLERS_ONLY;
+#endif
+
#define LIBXL_SUSPEND_DEBUG 1
#define LIBXL_SUSPEND_LIVE 2
+#define LIBXL_SUSPEND_NO_FINAL_SUSPEND 4
/* @param suspend_cancel [from xenctrl.h:xc_domain_resume( @param fast )]
* If this parameter is true, use co-operative resume. The guest
diff -r 6727070b4129 -r e44917a64f31 tools/libxl/libxl_dom.c
--- a/tools/libxl/libxl_dom.c
+++ b/tools/libxl/libxl_dom.c
@@ -1240,6 +1240,7 @@ void libxl__domain_suspend(libxl__egc *e
dss->xcflags = (live) ? XCFLAGS_LIVE : 0
| (debug) ? XCFLAGS_DEBUG : 0
+ | (dss->xlflags & LIBXL_SUSPEND_NO_FINAL_SUSPEND) ?
XCFLAGS_DOMSAVE_NOSUSPEND : 0
| (dss->hvm) ? XCFLAGS_HVM : 0;
dss->suspend_eventchn = -1;
diff -r 6727070b4129 -r e44917a64f31 tools/libxl/libxl_internal.h
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -2253,6 +2253,9 @@ struct libxl__domain_suspend_state {
xc_evtchn *xce; /* event channel handle */
int suspend_eventchn;
int hvm;
+ int max_iters;
+ int max_factor;
+ int xlflags;
int xcflags;
int guest_responded;
const char *dm_savefile;
diff -r 6727070b4129 -r e44917a64f31 tools/libxl/xl_cmdimpl.c
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -3172,7 +3172,7 @@ static int save_domain(uint32_t domid, c
save_domain_core_writeconfig(fd, filename, config_data, config_len);
- int rc = libxl_domain_suspend(ctx, domid, fd, 0, NULL);
+ int rc = libxl_domain_suspend(ctx, domid, fd, 0, 0, 0, NULL);
close(fd);
if (rc < 0)
@@ -3332,6 +3332,8 @@ static void migrate_do_preamble(int send
}
static void migrate_domain(uint32_t domid, const char *rune,
+ int max_iters, int max_factor,
+ int no_suspend,
const char *override_config_file)
{
pid_t child = -1;
@@ -3341,6 +3343,7 @@ static void migrate_domain(uint32_t domi
char rc_buf;
uint8_t *config_data;
int config_len;
+ int flags = LIBXL_SUSPEND_LIVE;
save_domain_core_begin(domid, override_config_file,
&config_data, &config_len);
@@ -3358,7 +3361,10 @@ static void migrate_domain(uint32_t domi
xtl_stdiostream_adjust_flags(logger, XTL_STDIOSTREAM_HIDE_PROGRESS, 0);
- rc = libxl_domain_suspend(ctx, domid, send_fd, LIBXL_SUSPEND_LIVE, NULL);
+ if (no_suspend)
+ flags |= LIBXL_SUSPEND_NO_FINAL_SUSPEND;
+
+ rc = libxl_domain_suspend(ctx, domid, send_fd, flags, max_iters,
max_factor, NULL);
if (rc) {
fprintf(stderr, "migration sender: libxl_domain_suspend failed"
" (rc=%d)\n", rc);
@@ -3751,8 +3757,16 @@ int main_migrate(int argc, char **argv)
char *rune = NULL;
char *host;
int opt, daemonize = 1, monitor = 1, debug = 0;
-
- SWITCH_FOREACH_OPT(opt, "FC:s:ed", NULL, "migrate", 2) {
+ int max_iters = 0, max_factor = 0, no_suspend = 0;
+ static struct option opts[] = {
+ {"max_iters", 1, 0, 'M'},
+ {"max_factor", 1, 0, 'm'},
+ {"no_suspend", 0, 0, 'N'},
+ COMMON_LONG_OPTS,
+ {0, 0, 0, 0}
+ };
+
+ SWITCH_FOREACH_OPT(opt, "FC:s:edM:m:N", opts, "migrate", 2) {
case 'C':
config_filename = optarg;
break;
@@ -3769,6 +3783,15 @@ int main_migrate(int argc, char **argv)
case 'd':
debug = 1;
break;
+ case 'M':
+ max_iters = atoi(optarg);
+ break;
+ case 'm':
+ max_factor = atoi(optarg);
+ break;
+ case 'N':
+ no_suspend = 1;
+ break;
}
domid = find_domain(argv[optind]);
@@ -3784,7 +3807,7 @@ int main_migrate(int argc, char **argv)
return 1;
}
- migrate_domain(domid, rune, config_filename);
+ migrate_domain(domid, rune, max_iters, max_factor, no_suspend,
config_filename);
return 0;
}
diff -r 6727070b4129 -r e44917a64f31 tools/libxl/xl_cmdtable.c
--- a/tools/libxl/xl_cmdtable.c
+++ b/tools/libxl/xl_cmdtable.c
@@ -145,15 +145,20 @@ struct cmd_spec cmd_table[] = {
},
{ "migrate",
&main_migrate, 0, 1,
- "Save a domain state to restore later",
+ "Migrate a domain to <host>",
"[options] <Domain> <host>",
- "-h Print this help.\n"
- "-C <config> Send <config> instead of config file from creation.\n"
- "-s <sshcommand> Use <sshcommand> instead of ssh. String will be
passed\n"
- " to sh. If empty, run <host> instead of ssh <host> xl\n"
- " migrate-receive [-d -e]\n"
- "-e Do not wait in the background (on <host>) for the
death\n"
- " of the domain."
+ "-h Print this help.\n"
+ "-C <config> Send <config> instead of config file from creation.\n"
+ "-s <sshcommand> Use <sshcommand> instead of ssh. String will be
passed\n"
+ " to sh. If empty, run <host> instead of ssh <host> xl\n"
+ " migrate-receive [-d -e]\n"
+ "-e Do not wait in the background (on <host>) for the
death\n"
+ " of the domain.\n"
+ "-M <number> Number of iterations before final suspend (default:
30)\n"
+ "--max_iters <number>\n"
+ "-m <factor> Max amount of memory to transfer before final suspend
(default: 3*RAM).\n"
+ "--max_factor <factor>\n"
+ "-N, --no_suspend Abort migration instead of doing final suspend."
},
{ "dump-core",
&main_dump_core, 0, 1,
diff -r 6727070b4129 -r e44917a64f31 tools/python/xen/xend/XendCheckpoint.py
--- a/tools/python/xen/xend/XendCheckpoint.py
+++ b/tools/python/xen/xend/XendCheckpoint.py
@@ -118,9 +118,19 @@ def save(fd, dominfo, network, live, dst
# enabled. Passing "0" simply uses the defaults compiled into
# libxenguest; see the comments and/or code in xc_linux_save() for
# more information.
+ max_iters = dominfo.info.get('max_iters', "0")
+ max_factor = dominfo.info.get('max_factor', "0")
+ no_suspend = dominfo.info.get('no_suspend', None)
+ if max_iters == "None":
+ max_iters = "0"
+ if max_factor == "None":
+ max_factor = "0"
+ if no_suspend == "None":
+ no_suspend = "0"
cmd = [xen.util.auxbin.pathTo(XC_SAVE), str(fd),
- str(dominfo.getDomid()), "0", "0",
- str(int(live) | (int(hvm) << 2)) ]
+ str(dominfo.getDomid()),
+ max_iters, max_factor,
+ str(int(live) | (int(hvm) << 2) | (int(no_suspend) << 5) ]
log.debug("[xc_save]: %s", string.join(cmd))
def saveInputHandler(line, tochild):
diff -r 6727070b4129 -r e44917a64f31 tools/python/xen/xend/XendDomain.py
--- a/tools/python/xen/xend/XendDomain.py
+++ b/tools/python/xen/xend/XendDomain.py
@@ -1832,6 +1832,18 @@ class XendDomain:
log.exception(ex)
raise XendError(str(ex))
+ def domain_migrate_constraints_set((self, domid, max_iters, max_factor,
no_suspend):
+ """Set the Migrate Constraints of this domain.
+ @param domid: Domain ID or Name
+ @param max_iters: Number of iterations before final suspend
+ @param max_factor: Max amount of memory to transfer before final
suspend
+ @param no_suspend: Abort migration instead of doing final suspend
+ """
+ dominfo = self.domain_lookup_nr(domid)
+ if not dominfo:
+ raise XendInvalidDomain(str(domid))
+ dominfo.setMigrateConstraints(max_iters, max_factor, no_suspend)
+
def domain_maxmem_set(self, domid, mem):
"""Set the memory limit for a domain.
diff -r 6727070b4129 -r e44917a64f31 tools/python/xen/xend/XendDomainInfo.py
--- a/tools/python/xen/xend/XendDomainInfo.py
+++ b/tools/python/xen/xend/XendDomainInfo.py
@@ -1459,6 +1459,18 @@ class XendDomainInfo:
pci_conf = self.info['devices'][dev_uuid][1]
return map(pci_dict_to_bdf_str, pci_conf['devs'])
+ def setMigrateConstraints(self, max_iters, max_factor, no_suspend):
+ """Set the Migrate Constraints of this domain.
+ @param max_iters: Number of iterations before final suspend
+ @param max_factor: Max amount of memory to transfer before final
suspend
+ @param no_suspend: Abort migration instead of doing final suspend
+ """
+ log.debug("Setting setMigrateConstraints of domain %s (%s) to '%s'
'%s' '%s'.",
+ self.info['name_label'], str(self.domid), max_iters,
max_factor, no_suspend)
+ self.info['max_iters'] = str(max_iters)
+ self.info['max_factor'] = str(max_factor)
+ self.info['no_suspend'] = str(no_suspend)
+
def setMemoryTarget(self, target):
"""Set the memory target of this domain.
@param target: In MiB.
diff -r 6727070b4129 -r e44917a64f31 tools/python/xen/xm/migrate.py
--- a/tools/python/xen/xm/migrate.py
+++ b/tools/python/xen/xm/migrate.py
@@ -55,6 +55,18 @@ gopts.opt('change_home_server', short='c
fn=set_true, default=0,
use="Change home server for managed domains.")
+gopts.opt('max_iters', short='M', val='max_iters',
+ fn=set_int, default=None,
+ use="Number of iterations before final suspend (default: 30).")
+
+gopts.opt('max_factor', short='m', val='max_factor',
+ fn=set_int, default=None,
+ use="Max amount of memory to transfer before final suspend (default:
3*RAM).")
+
+gopts.opt('no_suspend', short='S',
+ fn=set_true, default=None,
+ use="Abort migration instead of doing final suspend.")
+
def help():
return str(gopts)
@@ -80,6 +92,10 @@ def main(argv):
server.xenapi.VM.migrate(vm_ref, dst, bool(opts.vals.live),
other_config)
else:
+ server.xend.domain.migrate_constraints_set(dom,
+ opts.vals.max_iters,
+ opts.vals.max_factor,
+ opts.vals.no_suspend)
server.xend.domain.migrate(dom, dst, opts.vals.live,
opts.vals.port,
opts.vals.node,
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