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libxl.set-migration-constraints-from-cmdline.patch
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File libxl.set-migration-constraints-from-cmdline.patch of Package xen
From 77deb80879859ed279e24a790ec08e9c5d37dd0e Mon Sep 17 00:00:00 2001 From: Olaf Hering <olaf@aepfle.de> Date: Wed, 5 Feb 2014 14:37:53 +0100 Subject: libxl: set migration constraints from cmdline Add new options to 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 new dirty pages. Currently the guest is suspended to transfer the remaining dirty pages. The suspend/resume cycle will cause a time jump. This transfer can take a long time, which can confuse the guest if the time jump is too far. The new options allow to override the built-in default values, which are not changed by this patch. --max_iters <number> Number of iterations before final suspend (default: 30) --max_factor <factor> Max amount of memory to transfer before final suspend (default: 3*RAM) --min_remaing <pages> Number of dirty pages before stop© (default: 50) --abort_if_busy Abort migration instead of doing final suspend. The changes to libxl change the API, handle LIBXL_API_VERSION == 0x040200. v8: - merge --min_remaing changes - tools/libxc: print stats if migration is aborted - use special _suse version of lib calls to preserve ABI v7: - remove short options - update description of --abort_if_busy in xl.1 - extend description of --abort_if_busy in xl help - add comment to libxl_domain_suspend declaration, props is optional v6: - update the LIBXL_API_VERSION handling for libxl_domain_suspend change it to an inline function if LIBXL_API_VERSION is defined to 4.2.0 - rename libxl_save_properties to libxl_domain_suspend_properties - rename ->xlflags to ->flags within that struct v5: - adjust libxl_domain_suspend prototype, move flags, max_iters, max_factor into a new, optional struct libxl_save_properties - rename XCFLAGS_DOMSAVE_NOSUSPEND to XCFLAGS_DOMSAVE_ABORT_IF_BUSY - rename LIBXL_SUSPEND_NO_FINAL_SUSPEND to LIBXL_SUSPEND_ABORT_IF_BUSY - rename variables no_suspend to abort_if_busy - rename option -N/--no_suspend to -A/--abort_if_busy - update xl.1, extend description of -A option v4: - update default for no_suspend from None to 0 in XendCheckpoint.py:save - update logoutput in setMigrateConstraints - change xm migrate defaults from None to 0 - add new options to xl.1 - fix syntax error in XendDomain.py:domain_migrate_constraints_set - fix xm migrate -N option name to match xl migrate v3: - move logic errors in libxl__domain_suspend and fixed help text in cmd_table to separate patches - fix syntax error in XendCheckpoint.py - really pass max_iters and max_factor in libxl__xc_domain_save - make libxl_domain_suspend_0x040200 declaration globally visible - bump libxenlight.so SONAME from 2.0 to 2.1 due to changed libxl_domain_suspend 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@aepfle.de> --- docs/man/xl.pod.1 | 20 +++++++++++++++++++ tools/libxc/include/xenguest.h | 7 ++++++ tools/libxc/xc_nomigrate.c | 10 +++++++++ tools/libxc/xc_sr_common.h | 1 tools/libxc/xc_sr_save.c | 22 +++++++++++++++------ tools/libxl/libxl.c | 29 ++++++++++++++++++++++++---- tools/libxl/libxl.h | 15 ++++++++++++++ tools/libxl/libxl_dom_save.c | 1 tools/libxl/libxl_internal.h | 4 +++ tools/libxl/libxl_save_callout.c | 4 ++- tools/libxl/libxl_save_helper.c | 8 ++++--- tools/libxl/xl_cmdimpl.c | 40 +++++++++++++++++++++++++++++++++------ tools/libxl/xl_cmdtable.c | 23 ++++++++++++++-------- 13 files changed, 156 insertions(+), 28 deletions(-) Index: xen-4.10.0-testing/docs/man/xl.pod.1.in =================================================================== --- xen-4.10.0-testing.orig/docs/man/xl.pod.1.in +++ xen-4.10.0-testing/docs/man/xl.pod.1.in @@ -459,6 +459,26 @@ Display huge (!) amount of debug informa Leave the domain on the receive side paused after migration. +=item B<--max_iters> I<number> + +Number of iterations before final suspend (default: 30) + +=item B<--max_factor> I<factor> + +Max amount of memory to transfer before final suspend (default: 3*RAM) + +=item B<--min_remaining> + +Number of remaining dirty pages. If the number of dirty pages drops that +low the guest is suspended and the remaing pages are transfered to <host>. + +=item B<--abort_if_busy> + +Abort migration instead of doing final suspend/transfer/resume if the +guest has still dirty pages after the number of iterations and/or the +amount of RAM transferred. This avoids long periods of time where the +guest is suspended. + =back =item B<remus> [I<OPTIONS>] I<domain-id> I<host> Index: xen-4.10.0-testing/tools/libxc/include/xenguest.h =================================================================== --- xen-4.10.0-testing.orig/tools/libxc/include/xenguest.h +++ xen-4.10.0-testing/tools/libxc/include/xenguest.h @@ -29,6 +29,7 @@ #define XCFLAGS_HVM (1 << 2) #define XCFLAGS_STDVGA (1 << 3) #define XCFLAGS_CHECKPOINT_COMPRESS (1 << 4) +#define XCFLAGS_DOMSAVE_ABORT_IF_BUSY (1 << 5) #define X86_64_B_SIZE 64 #define X86_32_B_SIZE 32 @@ -131,10 +132,20 @@ typedef enum { * doesn't use checkpointing * @return 0 on success, -1 on failure */ +int xc_domain_save_suse(xc_interface *xch, int io_fd, uint32_t dom, uint32_t max_iters, + uint32_t max_factor, uint32_t flags /* XCFLAGS_xxx */, + uint32_t min_remaining, + struct save_callbacks* callbacks, int hvm, + xc_migration_stream_t stream_type, int recv_fd); +static inline int xc_domain_save(xc_interface *xch, int io_fd, uint32_t dom, uint32_t flags /* XCFLAGS_xxx */, struct save_callbacks* callbacks, int hvm, - xc_migration_stream_t stream_type, int recv_fd); + xc_migration_stream_t stream_type, int recv_fd) +{ + return xc_domain_save_suse(xch,io_fd,dom,0,0,flags,0,callbacks,hvm,stream_type,recv_fd); +} + /* callbacks provided by xc_domain_restore */ struct restore_callbacks { Index: xen-4.10.0-testing/tools/libxc/xc_nomigrate.c =================================================================== --- xen-4.10.0-testing.orig/tools/libxc/xc_nomigrate.c +++ xen-4.10.0-testing/tools/libxc/xc_nomigrate.c @@ -20,9 +20,11 @@ #include <xenctrl.h> #include <xenguest.h> -int xc_domain_save(xc_interface *xch, int io_fd, uint32_t dom, uint32_t flags, - struct save_callbacks* callbacks, int hvm, - xc_migration_stream_t stream_type, int recv_fd) +int xc_domain_save_suse(xc_interface *xch, int io_fd, uint32_t dom, uint32_t max_iters, + uint32_t max_factor, uint32_t flags, + uint32_t min_remaining, + struct save_callbacks* callbacks, int hvm, + xc_migration_stream_t stream_type, int recv_fd) { errno = ENOSYS; return -1; Index: xen-4.10.0-testing/tools/libxc/xc_sr_save.c =================================================================== --- xen-4.10.0-testing.orig/tools/libxc/xc_sr_save.c +++ xen-4.10.0-testing/tools/libxc/xc_sr_save.c @@ -525,6 +525,11 @@ static int send_memory_live(struct xc_sr policy_decision = precopy_policy(*policy_stats, data); x++; + if ( policy_decision == XGS_POLICY_ABORT ) + { + rc = -1; + break; + } if ( stats.dirty_count > 0 && policy_decision != XGS_POLICY_ABORT ) { rc = update_progress_string(ctx, &progress_str); @@ -545,6 +550,11 @@ static int send_memory_live(struct xc_sr policy_decision = precopy_policy(*policy_stats, data); + if ( policy_decision == XGS_POLICY_ABORT ) + { + rc = -1; + break; + } if ( policy_decision != XGS_POLICY_CONTINUE_PRECOPY ) break; @@ -965,9 +975,71 @@ static int save(struct xc_sr_context *ct return rc; }; -int xc_domain_save(xc_interface *xch, int io_fd, uint32_t dom, - uint32_t flags, struct save_callbacks* callbacks, - int hvm, xc_migration_stream_t stream_type, int recv_fd) +static struct suse_flags { + struct xc_sr_context *ctx; + unsigned long cnt; + uint32_t max_iters; + unsigned long max_factor; + long min_remaining; + long dirty_count; + uint32_t abort_if_busy; +} suse_flags; + +static int suse_precopy_policy(struct precopy_stats stats, void *user) +{ + xc_interface *xch = suse_flags.ctx->xch; + + suse_flags.cnt++; + errno = 0; + DBGPRINTF("%s: domU %u: #%lu iteration %u total_written %u dirty_count %ld", + __func__, suse_flags.ctx->domid, suse_flags.cnt, stats.iteration, stats.total_written, stats.dirty_count); + + if ( stats.dirty_count >= 0 ) + suse_flags.dirty_count = stats.dirty_count; + + /* Stop loop after N iterations */ + if ( stats.iteration > suse_flags.max_iters ) + { + IPRINTF("%s: domU %u, too many iterations (%u/%u)", + __func__, suse_flags.ctx->domid, stats.iteration, suse_flags.max_iters); + goto out; + } + /* Suspend domU in case only few dirty pages remain */ + if ( stats.dirty_count >= 0 && stats.dirty_count < suse_flags.min_remaining ) + { + IPRINTF("%s: domU %u, dirty_count reached (%ld/%ld)", + __func__, suse_flags.ctx->domid, stats.dirty_count, suse_flags.min_remaining); + goto suspend; + } + /* Stop loop if too much memory was transfered (formula incorrect for ballooned domU) */ + if ( stats.total_written > suse_flags.max_factor * suse_flags.ctx->save.p2m_size ) + { + IPRINTF("%s: domU %u, too much memory transfered (%u/%lu)", + __func__, suse_flags.ctx->domid, stats.total_written, suse_flags.max_factor * suse_flags.ctx->save.p2m_size); + goto out; + } + /* Keep going */ + return XGS_POLICY_CONTINUE_PRECOPY; + +out: + if ( suse_flags.abort_if_busy ) + { + errno = EBUSY; + PERROR("%s: domU %u busy, dirty pages %ld/%lu after %u iterations, %u pages transfered", + __func__, suse_flags.ctx->domid, + suse_flags.dirty_count, suse_flags.ctx->save.p2m_size, + stats.iteration, stats.total_written); + return XGS_POLICY_ABORT; + } +suspend: + return XGS_POLICY_STOP_AND_COPY; +} + +int xc_domain_save_suse(xc_interface *xch, int io_fd, uint32_t dom, + uint32_t max_iters, uint32_t max_factor, uint32_t flags, + uint32_t min_remaining, + struct save_callbacks* callbacks, int hvm, + xc_migration_stream_t stream_type, int recv_fd) { struct xc_sr_context ctx = { @@ -982,6 +1054,19 @@ int xc_domain_save(xc_interface *xch, in ctx.save.checkpointed = stream_type; ctx.save.recv_fd = recv_fd; + if ( callbacks->precopy_policy ) + { + errno = EBUSY; + PERROR("%s: precopy_policy already set (%p)", __func__, callbacks->precopy_policy); + return -1; + } + callbacks->precopy_policy = suse_precopy_policy; + suse_flags.ctx = &ctx; + suse_flags.max_iters = max_iters ? : 5; + suse_flags.max_factor = max_factor ? : 3; + suse_flags.min_remaining = min_remaining ? : 50; + suse_flags.abort_if_busy = !!(flags & XCFLAGS_DOMSAVE_ABORT_IF_BUSY); + /* If altering migration_stream update this assert too. */ assert(stream_type == XC_MIG_STREAM_NONE || stream_type == XC_MIG_STREAM_REMUS || Index: xen-4.10.0-testing/tools/libxl/libxl.h =================================================================== --- xen-4.10.0-testing.orig/tools/libxl/libxl.h +++ xen-4.10.0-testing/tools/libxl/libxl.h @@ -1470,8 +1470,23 @@ int libxl_domain_suspend(libxl_ctx *ctx, int flags, /* LIBXL_SUSPEND_* */ const libxl_asyncop_how *ao_how) LIBXL_EXTERNAL_CALLERS_ONLY; + +typedef struct { + int flags; /* LIBXL_SUSPEND_* */ + int max_iters; + int max_factor; + int min_remaining; +} libxl_domain_suspend_suse_properties; + +#define LIBXL_HAVE_DOMAIN_SUSPEND_SUSE +int libxl_domain_suspend_suse(libxl_ctx *ctx, uint32_t domid, int fd, + const libxl_domain_suspend_suse_properties *props, /* optional */ + const libxl_asyncop_how *ao_how) + LIBXL_EXTERNAL_CALLERS_ONLY; + #define LIBXL_SUSPEND_DEBUG 1 #define LIBXL_SUSPEND_LIVE 2 +#define LIBXL_SUSPEND_ABORT_IF_BUSY 4 /* @param suspend_cancel [from xenctrl.h:xc_domain_resume( @param fast )] * If this parameter is true, use co-operative resume. The guest Index: xen-4.10.0-testing/tools/libxl/libxl_dom_save.c =================================================================== --- xen-4.10.0-testing.orig/tools/libxl/libxl_dom_save.c +++ xen-4.10.0-testing/tools/libxl/libxl_dom_save.c @@ -379,6 +379,7 @@ void libxl__domain_save(libxl__egc *egc, dss->xcflags = (live ? XCFLAGS_LIVE : 0) | (debug ? XCFLAGS_DEBUG : 0) + | (dss->xlflags & LIBXL_SUSPEND_ABORT_IF_BUSY ? XCFLAGS_DOMSAVE_ABORT_IF_BUSY : 0) | (dss->hvm ? XCFLAGS_HVM : 0); /* Disallow saving a guest with vNUMA configured because migration Index: xen-4.10.0-testing/tools/libxl/libxl_domain.c =================================================================== --- xen-4.10.0-testing.orig/tools/libxl/libxl_domain.c +++ xen-4.10.0-testing/tools/libxl/libxl_domain.c @@ -486,8 +486,9 @@ static void domain_suspend_cb(libxl__egc } -int libxl_domain_suspend(libxl_ctx *ctx, uint32_t domid, int fd, int flags, - const libxl_asyncop_how *ao_how) +static int do_libxl_domain_suspend(libxl_ctx *ctx, uint32_t domid, int fd, + const libxl_domain_suspend_suse_properties *props, + const libxl_asyncop_how *ao_how) { AO_CREATE(ctx, domid, ao_how); int rc; @@ -507,9 +508,15 @@ int libxl_domain_suspend(libxl_ctx *ctx, dss->domid = domid; dss->fd = fd; dss->type = type; - dss->live = flags & LIBXL_SUSPEND_LIVE; - dss->debug = flags & LIBXL_SUSPEND_DEBUG; dss->checkpointed_stream = LIBXL_CHECKPOINTED_STREAM_NONE; + if (props) { + dss->live = props->flags & LIBXL_SUSPEND_LIVE; + dss->debug = props->flags & LIBXL_SUSPEND_DEBUG; + dss->max_iters = props->max_iters; + dss->max_factor = props->max_factor; + dss->min_remaining = props->min_remaining; + dss->xlflags = props->flags; + } rc = libxl__fd_flags_modify_save(gc, dss->fd, ~(O_NONBLOCK|O_NDELAY), 0, @@ -523,6 +530,20 @@ int libxl_domain_suspend(libxl_ctx *ctx, return AO_CREATE_FAIL(rc); } +int libxl_domain_suspend_suse(libxl_ctx *ctx, uint32_t domid, int fd, + const libxl_domain_suspend_suse_properties *props, + const libxl_asyncop_how *ao_how) +{ + return do_libxl_domain_suspend(ctx, domid, fd, props, ao_how); +} + +int libxl_domain_suspend(libxl_ctx *ctx, uint32_t domid, int fd, int flags, + const libxl_asyncop_how *ao_how) +{ + libxl_domain_suspend_suse_properties props = { .flags = flags }; + return do_libxl_domain_suspend(ctx, domid, fd, &props, ao_how); +} + int libxl_domain_pause(libxl_ctx *ctx, uint32_t domid) { int ret; Index: xen-4.10.0-testing/tools/libxl/libxl_internal.h =================================================================== --- xen-4.10.0-testing.orig/tools/libxl/libxl_internal.h +++ xen-4.10.0-testing/tools/libxl/libxl_internal.h @@ -3294,6 +3294,10 @@ struct libxl__domain_save_state { /* private */ int rc; int hvm; + int max_iters; + int max_factor; + int min_remaining; + int xlflags; int xcflags; libxl__domain_suspend_state dsps; union { Index: xen-4.10.0-testing/tools/libxl/libxl_save_callout.c =================================================================== --- xen-4.10.0-testing.orig/tools/libxl/libxl_save_callout.c +++ xen-4.10.0-testing/tools/libxl/libxl_save_callout.c @@ -89,7 +89,9 @@ void libxl__xc_domain_save(libxl__egc *e libxl__srm_callout_enumcallbacks_save(&shs->callbacks.save.a); const unsigned long argnums[] = { - dss->domid, dss->xcflags, dss->hvm, cbflags, + dss->domid, + dss->max_iters, dss->max_factor, dss->min_remaining, + dss->xcflags, dss->hvm, cbflags, dss->checkpointed_stream, }; Index: xen-4.10.0-testing/tools/libxl/libxl_save_helper.c =================================================================== --- xen-4.10.0-testing.orig/tools/libxl/libxl_save_helper.c +++ xen-4.10.0-testing/tools/libxl/libxl_save_helper.c @@ -251,6 +251,9 @@ int main(int argc, char **argv) io_fd = atoi(NEXTARG); recv_fd = atoi(NEXTARG); uint32_t dom = strtoul(NEXTARG,0,10); + uint32_t max_iters = strtoul(NEXTARG,0,10); + uint32_t max_factor = strtoul(NEXTARG,0,10); + uint32_t min_remaining = strtoul(NEXTARG,0,10); uint32_t flags = strtoul(NEXTARG,0,10); int hvm = atoi(NEXTARG); unsigned cbflags = strtoul(NEXTARG,0,10); @@ -262,8 +265,10 @@ int main(int argc, char **argv) startup("save"); setup_signals(save_signal_handler); - r = xc_domain_save(xch, io_fd, dom, flags, &helper_save_callbacks, - hvm, stream_type, recv_fd); + r = xc_domain_save_suse(xch, io_fd, dom, max_iters, max_factor, flags, + min_remaining, + &helper_save_callbacks, hvm, stream_type, + recv_fd); complete(r); } else if (!strcmp(mode,"--restore-domain")) { Index: xen-4.10.0-testing/tools/xl/xl_cmdtable.c =================================================================== --- xen-4.10.0-testing.orig/tools/xl/xl_cmdtable.c +++ xen-4.10.0-testing/tools/xl/xl_cmdtable.c @@ -157,15 +157,22 @@ struct cmd_spec cmd_table[] = { &main_migrate, 0, 1, "Migrate a domain to another 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.\n" - "--debug Print huge (!) amount of debug during the migration process.\n" - "-p Do not unpause domain after migrating it." + "-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" + "--debug Print huge (!) amount of debug during the migration process.\n" + "-p Do not unpause domain after migrating it.\n" + "\n" + "SUSE Linux specific options:\n" + "--max_iters <number> Number of iterations before final suspend (default: 30)\n" + "--max_factor <factor> Max amount of memory to transfer before final suspend (default: 3*RAM).\n" + "--min_remaining <pages> Number of remaining dirty pages before final suspend (default: 50).\n" + "--abort_if_busy Abort migration instead of doing final suspend, if number\n" + " of iterations or amount of transfered memory is exceeded." }, { "restore", &main_restore, 0, 1, Index: xen-4.10.0-testing/tools/xl/xl_migrate.c =================================================================== --- xen-4.10.0-testing.orig/tools/xl/xl_migrate.c +++ xen-4.10.0-testing/tools/xl/xl_migrate.c @@ -177,6 +177,8 @@ static void migrate_do_preamble(int send } static void migrate_domain(uint32_t domid, const char *rune, int debug, + int max_iters, int max_factor, + int min_remaining, int abort_if_busy, const char *override_config_file) { pid_t child = -1; @@ -185,7 +187,13 @@ static void migrate_domain(uint32_t domi char *away_domname; char rc_buf; uint8_t *config_data; - int config_len, flags = LIBXL_SUSPEND_LIVE; + int config_len; + libxl_domain_suspend_suse_properties props = { + .flags = LIBXL_SUSPEND_LIVE, + .max_iters = max_iters, + .max_factor = max_factor, + .min_remaining = min_remaining, + }; save_domain_core_begin(domid, override_config_file, &config_data, &config_len); @@ -204,10 +212,12 @@ static void migrate_domain(uint32_t domi xtl_stdiostream_adjust_flags(logger, XTL_STDIOSTREAM_HIDE_PROGRESS, 0); if (debug) - flags |= LIBXL_SUSPEND_DEBUG; - rc = libxl_domain_suspend(ctx, domid, send_fd, flags, NULL); + props.flags |= LIBXL_SUSPEND_DEBUG; + if (abort_if_busy) + props.flags |= LIBXL_SUSPEND_ABORT_IF_BUSY; + rc = libxl_domain_suspend_suse(ctx, domid, send_fd, &props, NULL); if (rc) { - fprintf(stderr, "migration sender: libxl_domain_suspend failed" + fprintf(stderr, "migration sender: libxl_domain_suspend_suse failed" " (rc=%d)\n", rc); if (rc == ERROR_GUEST_TIMEDOUT) goto failed_suspend; @@ -537,13 +547,18 @@ int main_migrate(int argc, char **argv) char *rune = NULL; char *host; int opt, daemonize = 1, monitor = 1, debug = 0, pause_after_migration = 0; + int max_iters = 0, max_factor = 0, min_remaining = 0, abort_if_busy = 0; static struct option opts[] = { {"debug", 0, 0, 0x100}, + {"max_iters", 1, 0, 0x101}, + {"max_factor", 1, 0, 0x102}, + {"min_remaining", 1, 0, 0x103}, + {"abort_if_busy", 0, 0, 0x104}, {"live", 0, 0, 0x200}, COMMON_LONG_OPTS }; - SWITCH_FOREACH_OPT(opt, "FC:s:ep", opts, "migrate", 2) { + SWITCH_FOREACH_OPT(opt, "FC:s:epM:m:A", opts, "migrate", 2) { case 'C': config_filename = optarg; break; @@ -563,6 +578,18 @@ int main_migrate(int argc, char **argv) case 0x100: /* --debug */ debug = 1; break; + case 0x101: + max_iters = atoi(optarg); + break; + case 0x102: + max_factor = atoi(optarg); + break; + case 0x103: + min_remaining = atoi(optarg); + break; + case 0x104: + abort_if_busy = 1; + break; case 0x200: /* --live */ /* ignored for compatibility with xm */ break; @@ -596,7 +623,8 @@ int main_migrate(int argc, char **argv) pause_after_migration ? " -p" : ""); } - migrate_domain(domid, rune, debug, config_filename); + migrate_domain(domid, rune, debug, max_iters, max_factor, min_remaining, + abort_if_busy, config_filename); return EXIT_SUCCESS; }
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