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From: Olaf Hering <olaf@aepfle.de>
To: xen-devel@lists.xenproject.org
Cc: Olaf Hering <olaf@aepfle.de>, Ian Jackson <iwj@xenproject.org>,
	Wei Liu <wl@xen.org>, Anthony PERARD <anthony.perard@citrix.com>,
	Juergen Gross <jgross@suse.com>
Subject: [PATCH v20210616 31/36] tools: add --max_iters to libxl_domain_suspend
Date: Wed, 16 Jun 2021 14:51:24 +0200	[thread overview]
Message-ID: <20210616125129.26563-32-olaf@aepfle.de> (raw)
In-Reply-To: <20210616125129.26563-1-olaf@aepfle.de>

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@aepfle.de>
---
 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 70a6ebf438..594387bcf4 100644
--- a/docs/man/xl.1.pod.in
+++ b/docs/man/xl.1.pod.in
@@ -494,6 +494,10 @@ 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 9a4d7514ed..bf77da0524 100644
--- a/tools/include/libxl.h
+++ b/tools/include/libxl.h
@@ -1714,6 +1714,7 @@ 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 5dbd27900f..9f98cd7f2b 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 57d7e4b4b8..8cbcc5282c 100644
--- a/tools/libs/light/libxl_internal.h
+++ b/tools/libs/light/libxl_internal.h
@@ -3649,6 +3649,7 @@ 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 ca1dfa3525..9b6b3c99aa 100644
--- a/tools/xl/xl_cmdtable.c
+++ b/tools/xl/xl_cmdtable.c
@@ -174,7 +174,8 @@ const struct cmd_spec cmd_table[] = {
       "                of the domain.\n"
       "--debug         Ignored.\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 144890924f..af117d4d56 100644
--- a/tools/xl/xl_migrate.c
+++ b/tools/xl/xl_migrate.c
@@ -178,6 +178,7 @@ 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;
@@ -189,6 +190,7 @@ 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,
         };
 
     save_domain_core_begin(domid, preserve_domid, override_config_file,
@@ -542,8 +544,10 @@ 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
     };
@@ -571,6 +575,9 @@ 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;
@@ -605,7 +612,8 @@ 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;
 }
 


  parent reply	other threads:[~2021-06-16 13:07 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-16 12:50 [PATCH v20210616 00/36] leftover from 2020 Olaf Hering
2021-06-16 12:50 ` [PATCH v20210616 01/36] hotplug/Linux: fix starting of xenstored with restarting systemd Olaf Hering
2021-06-16 12:50 ` [PATCH v20210616 02/36] tools: add API to work with sevaral bits at once Olaf Hering
2021-06-16 12:50 ` [PATCH v20210616 03/36] xl: fix description of migrate --debug Olaf Hering
2021-06-16 12:50 ` [PATCH v20210616 04/36] tools: create libxensaverestore Olaf Hering
2021-06-16 15:17   ` Olaf Hering
2021-06-16 12:50 ` [PATCH v20210616 05/36] MAINTAINERS: add myself as saverestore maintainer Olaf Hering
2021-06-16 12:50 ` [PATCH v20210616 06/36] tools: add readv_exact to libxenctrl Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 07/36] tools: add sr_is_known_page_type to libsaverestore Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 08/36] tools: use sr_is_known_page_type Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 09/36] tools: unify type checking for data pfns in migration stream Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 10/36] tools: show migration transfer rate in send_dirty_pages Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 11/36] tools: prepare to allocate saverestore arrays once Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 12/36] tools: save: move mfns array Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 13/36] tools: save: move types array Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 14/36] tools: save: move errors array Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 15/36] tools: save: move iov array Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 16/36] tools: save: move rec_pfns array Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 17/36] tools: save: move guest_data array Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 18/36] tools: save: move local_pages array Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 19/36] tools: restore: move types array Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 20/36] tools: restore: move mfns array Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 21/36] tools: restore: move map_errs array Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 22/36] tools: restore: move mfns array in populate_pfns Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 23/36] tools: restore: move pfns " Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 24/36] tools: restore: split record processing Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 25/36] tools: restore: split handle_page_data Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 26/36] tools: restore: write data directly into guest Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 27/36] tools: recognize LIBXL_API_VERSION for 4.16 Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 28/36] tools: adjust libxl_domain_suspend to receive a struct props Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 29/36] tools: change struct precopy_stats to precopy_stats_t Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 30/36] tools: add callback to libxl for precopy_policy and precopy_stats_t Olaf Hering
2021-06-16 12:51 ` Olaf Hering [this message]
2021-06-16 12:51 ` [PATCH v20210616 32/36] tools: add --min_remaining to libxl_domain_suspend Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 33/36] tools: add --abort_if_busy " Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 34/36] tools: add API for expandable bitmaps Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 35/36] tools: use sr_bitmap for populated_pfns Olaf Hering
2021-06-16 12:51 ` [PATCH v20210616 36/36] tools: use superpages during restore of HVM guest Olaf Hering
2021-06-16 14:50 ` [PATCH v20210616 00/36] leftover from 2020 Andrew Cooper
2021-06-16 15:02   ` Olaf Hering
2021-06-17 11:02     ` Julien Grall
2021-06-17 17:40       ` Olaf Hering
2021-06-16 15:38   ` Olaf Hering
2021-06-17 11:24     ` Andrew Cooper
2021-06-17 14:55       ` Olaf Hering
2021-06-17 15:05         ` Andrew Cooper

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