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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v20210111 37/39] tools: add --max_iters to libxl_domain_suspend
Migrating a large, and potentially busy, domU will take more
time than neccessary due to excessive number of copying iterations.
Allow to host admin to control the number of iterations which
copy cumulated domU dirty pages to the target host.
The default remains 5, which means one initial iteration to copy the
entire domU memory, and up to 4 additional iterations to copy dirty
memory from the still running domU. After the given number of iterations
the domU is suspended, remaining dirty memory is copied and the domU is
finally moved to the target host.
This patch adjusts xl(1) and the libxl API.
External users check LIBXL_HAVE_DOMAIN_SUSPEND_PROPS for the availibility
of the new .max_iters property.
Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
---
docs/man/xl.1.pod.in | 4 ++++
tools/include/libxl.h | 1 +
tools/libs/light/libxl_dom_save.c | 2 +-
tools/libs/light/libxl_domain.c | 1 +
tools/libs/light/libxl_internal.h | 1 +
tools/xl/xl_cmdtable.c | 3 ++-
tools/xl/xl_migrate.c | 10 +++++++++-
7 files changed, 19 insertions(+), 3 deletions(-)
diff --git a/docs/man/xl.1.pod.in b/docs/man/xl.1.pod.in
index e6e4e8e83a..8339bd8e6f 100644
--- a/docs/man/xl.1.pod.in
+++ b/docs/man/xl.1.pod.in
@@ -496,6 +496,10 @@ such that it will be identical on the destination host,
unless that
configuration is overridden using the B<-C> option. Note that it is not
possible to use this option for a 'localhost' migration.
+=item B<--max_iters> I<iterations>
+
+Number of copy iterations before final suspend+move (default: 5)
+
=back
=item B<remus> [I<OPTIONS>] I<domain-id> I<host>
diff --git a/tools/include/libxl.h b/tools/include/libxl.h
index 94b8f1095f..646cef28aa 100644
--- a/tools/include/libxl.h
+++ b/tools/include/libxl.h
@@ -1675,6 +1675,7 @@ static inline int
libxl_retrieve_domain_configuration_0x041200(
typedef struct {
uint32_t flags; /* LIBXL_SUSPEND_* */
+ uint32_t max_iters;
} libxl_domain_suspend_props;
#define LIBXL_SUSPEND_DEBUG 1
#define LIBXL_SUSPEND_LIVE 2
diff --git a/tools/libs/light/libxl_dom_save.c
b/tools/libs/light/libxl_dom_save.c
index 3f3cff0342..938c0127f3 100644
--- a/tools/libs/light/libxl_dom_save.c
+++ b/tools/libs/light/libxl_dom_save.c
@@ -383,7 +383,7 @@ static int
libxl__domain_save_precopy_policy(precopy_stats_t stats, void *user)
stats.iteration, stats.dirty_count, stats.total_written);
if (stats.dirty_count >= 0 && stats.dirty_count <
LIBXL_XGS_POLICY_TARGET_DIRTY_COUNT)
goto stop_copy;
- if (stats.iteration >= LIBXL_XGS_POLICY_MAX_ITERATIONS)
+ if (stats.iteration >= dss->max_iters)
goto stop_copy;
return XGS_POLICY_CONTINUE_PRECOPY;
diff --git a/tools/libs/light/libxl_domain.c b/tools/libs/light/libxl_domain.c
index 45e0c57c3a..612d3dc4ea 100644
--- a/tools/libs/light/libxl_domain.c
+++ b/tools/libs/light/libxl_domain.c
@@ -527,6 +527,7 @@ int libxl_domain_suspend(libxl_ctx *ctx, uint32_t domid,
int fd,
dss->domid = domid;
dss->fd = fd;
dss->type = type;
+ dss->max_iters = props->max_iters ?: LIBXL_XGS_POLICY_MAX_ITERATIONS;
dss->live = props->flags & LIBXL_SUSPEND_LIVE;
dss->debug = props->flags & LIBXL_SUSPEND_DEBUG;
dss->checkpointed_stream = LIBXL_CHECKPOINTED_STREAM_NONE;
diff --git a/tools/libs/light/libxl_internal.h
b/tools/libs/light/libxl_internal.h
index d4cc694c01..80a31c3a88 100644
--- a/tools/libs/light/libxl_internal.h
+++ b/tools/libs/light/libxl_internal.h
@@ -3640,6 +3640,7 @@ struct libxl__domain_save_state {
int live;
int debug;
int checkpointed_stream;
+ uint32_t max_iters;
const libxl_domain_remus_info *remus;
/* private */
int rc;
diff --git a/tools/xl/xl_cmdtable.c b/tools/xl/xl_cmdtable.c
index a0567169bf..75e2e4d54b 100644
--- a/tools/xl/xl_cmdtable.c
+++ b/tools/xl/xl_cmdtable.c
@@ -170,7 +170,8 @@ struct cmd_spec cmd_table[] = {
"-T Show timestamps during the migration process.\n"
"--debug Verify transferred domU page data.\n"
"-p Do not unpause domain after migrating it.\n"
- "-D Preserve the domain id"
+ "-D Preserve the domain id\n"
+ "--max_iters N Number of copy iterations before final stop+move"
},
{ "restore",
&main_restore, 0, 1,
diff --git a/tools/xl/xl_migrate.c b/tools/xl/xl_migrate.c
index fc9f69bf06..a724bc21ea 100644
--- a/tools/xl/xl_migrate.c
+++ b/tools/xl/xl_migrate.c
@@ -180,6 +180,7 @@ static void migrate_do_preamble(int send_fd, int recv_fd,
pid_t child,
static void migrate_domain(uint32_t domid, int preserve_domid,
const char *rune, int debug,
+ uint32_t max_iters,
const char *override_config_file)
{
pid_t child = -1;
@@ -191,6 +192,7 @@ static void migrate_domain(uint32_t domid, int
preserve_domid,
int config_len;
libxl_domain_suspend_props props = {
.flags = LIBXL_SUSPEND_LIVE,
+ .max_iters = max_iters,
};
unsigned xtl_flags = XTL_STDIOSTREAM_HIDE_PROGRESS;
@@ -555,8 +557,10 @@ int main_migrate(int argc, char **argv)
char *host;
int opt, daemonize = 1, monitor = 1, debug = 0, pause_after_migration = 0;
int preserve_domid = 0;
+ uint32_t max_iters = 0;
static struct option opts[] = {
{"debug", 0, 0, 0x100},
+ {"max_iters", 1, 0, 0x101},
{"live", 0, 0, 0x200},
COMMON_LONG_OPTS
};
@@ -587,6 +591,9 @@ int main_migrate(int argc, char **argv)
case 0x100: /* --debug */
debug = 1;
break;
+ case 0x101: /* --max_iters */
+ max_iters = atoi(optarg);
+ break;
case 0x200: /* --live */
/* ignored for compatibility with xm */
break;
@@ -621,7 +628,8 @@ int main_migrate(int argc, char **argv)
pause_after_migration ? " -p" : "");
}
- migrate_domain(domid, preserve_domid, rune, debug, config_filename);
+ migrate_domain(domid, preserve_domid, rune, debug,
+ max_iters, config_filename);
return EXIT_SUCCESS;
}
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