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xen.30996
libxc-sr-max_iters.patch
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File libxc-sr-max_iters.patch of Package xen.30996
From: Olaf Hering <olaf@aepfle.de> Date: Sat, 9 Jan 2021 11:32:17 +0100 Subject: libxc sr max_iters 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@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(-) --- 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 de 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> --- a/tools/include/libxl.h +++ b/tools/include/libxl.h @@ -1754,6 +1754,7 @@ static inline int libxl_retrieve_domain_ typedef struct { uint32_t flags; /* LIBXL_SUSPEND_* */ + uint32_t max_iters; } libxl_domain_suspend_suse_properties; #define LIBXL_SUSPEND_DEBUG 1 #define LIBXL_SUSPEND_LIVE 2 --- 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_po 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; --- a/tools/libs/light/libxl_domain.c +++ b/tools/libs/light/libxl_domain.c @@ -528,6 +528,7 @@ static int do_libxl_domain_suspend(libxl 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; --- a/tools/libs/light/libxl_internal.h +++ b/tools/libs/light/libxl_internal.h @@ -3650,6 +3650,7 @@ 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; --- 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 Enable verification mode.\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, --- a/tools/xl/xl_migrate.c +++ b/tools/xl/xl_migrate.c @@ -178,6 +178,7 @@ static void migrate_do_preamble(int send 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 domi int config_len; libxl_domain_suspend_suse_properties 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; }
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