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libxc-sr-abort_if_busy.patch
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File libxc-sr-abort_if_busy.patch of Package xen
From: Olaf Hering <olaf@aepfle.de> Date: Thu, 7 Jan 2021 20:25:28 +0100 Subject: libxc sr abort_if_busy tools: add --abort_if_busy to libxl_domain_suspend Provide a knob to the host admin to abort the live migration of a running domU if the downtime during final transit will be too long for the workload within domU. Adjust error reporting. Add ERROR_MIGRATION_ABORTED to allow callers of libxl_domain_suspend to distinguish between errors and the requested constraint. Adjust precopy_policy to simplify reporting of remaining dirty pages. The loop in send_memory_live populates ->dirty_count in a different place than ->iteration. Let it proceeed one more time to provide the desired information before leaving the loop. This patch adjusts xl(1) and the libxl API. External users check LIBXL_HAVE_DOMAIN_SUSPEND_PROPS for the availibility of the new .abort_if_busy property. Signed-off-by: Olaf Hering <olaf@aepfle.de> --- docs/man/xl.1.pod.in | 8 ++++++++ tools/include/libxl.h | 1 + tools/libs/light/libxl_dom_save.c | 7 ++++++- tools/libs/light/libxl_domain.c | 1 + tools/libs/light/libxl_internal.h | 2 ++ tools/libs/light/libxl_stream_write.c | 9 ++++++++- tools/libs/light/libxl_types.idl | 1 + tools/xl/xl_cmdtable.c | 6 +++++- tools/xl/xl_migrate.c | 30 +++++++++++++++++++++++------- 9 files changed, 55 insertions(+), 10 deletions(-) --- a/docs/man/xl.1.pod.in +++ b/docs/man/xl.1.pod.in @@ -507,6 +507,14 @@ low, the guest is suspended and the domU This allows the host admin to control for how long the domU will likely be suspended during transit. +=item B<--abort_if_busy> + +Abort migration instead of doing final suspend/move/resume if the +guest produced more than I<min_remaining> dirty pages during th number +of I<max_iters> iterations. +This avoids long periods of time where the guest is suspended, which +may confuse the workload within domU. + =back =item B<remus> [I<OPTIONS>] I<domain-id> I<host> --- a/tools/include/libxl.h +++ b/tools/include/libxl.h @@ -1778,6 +1778,7 @@ typedef struct { } libxl_domain_suspend_suse_properties; #define LIBXL_SUSPEND_DEBUG 1 #define LIBXL_SUSPEND_LIVE 2 +#define LIBXL_SUSPEND_ABORT_IF_BUSY 4 #define LIBXL_HAVE_DOMAIN_SUSPEND_SUSE int libxl_domain_suspend_suse(libxl_ctx *ctx, uint32_t domid, int fd, --- a/tools/libs/light/libxl_dom_save.c +++ b/tools/libs/light/libxl_dom_save.c @@ -383,11 +383,16 @@ static int libxl__domain_save_precopy_po stats.iteration, stats.dirty_count, stats.total_written); if (stats.dirty_count >= 0 && stats.dirty_count < dss->min_remaining) goto stop_copy; - if (stats.iteration >= dss->max_iters) + if (stats.dirty_count >= 0 && stats.iteration >= dss->max_iters) goto stop_copy; return XGS_POLICY_CONTINUE_PRECOPY; stop_copy: + if (dss->abort_if_busy) + { + dss->remaining_dirty_pages = stats.dirty_count; + return XGS_POLICY_ABORT; + } return XGS_POLICY_STOP_AND_COPY; } --- a/tools/libs/light/libxl_domain.c +++ b/tools/libs/light/libxl_domain.c @@ -530,6 +530,7 @@ static int do_libxl_domain_suspend(libxl dss->type = type; dss->max_iters = props->max_iters ?: LIBXL_XGS_POLICY_MAX_ITERATIONS; dss->min_remaining = props->min_remaining ?: LIBXL_XGS_POLICY_TARGET_DIRTY_COUNT; + dss->abort_if_busy = props->flags & LIBXL_SUSPEND_ABORT_IF_BUSY; 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 @@ -3653,9 +3653,11 @@ struct libxl__domain_save_state { libxl_domain_type type; int live; int debug; + int abort_if_busy; int checkpointed_stream; uint32_t max_iters; uint32_t min_remaining; + long remaining_dirty_pages; const libxl_domain_remus_info *remus; /* private */ int rc; --- a/tools/libs/light/libxl_stream_write.c +++ b/tools/libs/light/libxl_stream_write.c @@ -344,11 +344,18 @@ void libxl__xc_domain_save_done(libxl__e goto err; if (retval) { + if (dss->remaining_dirty_pages) { + LOGD(NOTICE, dss->domid, "saving domain: aborted," + " %ld remaining dirty pages.", dss->remaining_dirty_pages); + } else { LOGEVD(ERROR, errnoval, dss->domid, "saving domain: %s", dss->dsps.guest_responded ? "domain responded to suspend request" : "domain did not respond to suspend request"); - if (!dss->dsps.guest_responded) + } + if (dss->remaining_dirty_pages) + rc = ERROR_MIGRATION_ABORTED; + else if(!dss->dsps.guest_responded) rc = ERROR_GUEST_TIMEDOUT; else if (dss->rc) rc = dss->rc; --- a/tools/libs/light/libxl_types.idl +++ b/tools/libs/light/libxl_types.idl @@ -76,6 +76,7 @@ libxl_error = Enumeration("error", [ (-30, "QMP_DEVICE_NOT_ACTIVE"), # a device has failed to be become active (-31, "QMP_DEVICE_NOT_FOUND"), # the requested device has not been found (-32, "QEMU_API"), # QEMU's replies don't contains expected members + (-33, "MIGRATION_ABORTED"), ], value_namespace = "") libxl_domain_type = Enumeration("domain_type", [ --- a/tools/xl/xl_cmdtable.c +++ b/tools/xl/xl_cmdtable.c @@ -176,7 +176,11 @@ const struct cmd_spec cmd_table[] = { "-p Do not unpause domain after migrating it.\n" "-D Preserve the domain id\n" "--max_iters N Number of copy iterations before final stop+move\n" - "--min_remaining N Number of remaining dirty pages before final stop+move" + "--min_remaining N Number of remaining dirty pages before final stop+move\n" + "--abort_if_busy Abort migration instead of doing final stop+move,\n" + " if the number of dirty pages is higher than <min_remaining>\n" + " after <max_iters> iterations. Otherwise the amount of memory\n" + " to be transfered would exceed maximum allowed domU downtime." }, { "restore", &main_restore, 0, 1, --- a/tools/xl/xl_migrate.c +++ b/tools/xl/xl_migrate.c @@ -177,7 +177,7 @@ static void migrate_do_preamble(int send } static void migrate_domain(uint32_t domid, int preserve_domid, - const char *rune, int debug, + const char *rune, int debug, int abort_if_busy, uint32_t max_iters, uint32_t min_remaining, const char *override_config_file) @@ -213,14 +213,20 @@ static void migrate_domain(uint32_t domi if (debug) 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" " (rc=%d)\n", rc); - if (rc == ERROR_GUEST_TIMEDOUT) - goto failed_suspend; - else - goto failed_resume; + switch (rc) { + case ERROR_GUEST_TIMEDOUT: + goto failed_suspend; + case ERROR_MIGRATION_ABORTED: + goto failed_busy; + default: + goto failed_resume; + } } //fprintf(stderr, "migration sender: Transfer complete.\n"); @@ -302,6 +308,12 @@ static void migrate_domain(uint32_t domi fprintf(stderr, "Migration failed, failed to suspend at sender.\n"); exit(EXIT_FAILURE); + failed_busy: + close(send_fd); + migration_child_report(recv_fd); + fprintf(stderr, "Migration aborted as requested, domain is too busy.\n"); + exit(EXIT_FAILURE); + failed_resume: close(send_fd); migration_child_report(recv_fd); @@ -545,13 +557,14 @@ 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 preserve_domid = 0; + int preserve_domid = 0, abort_if_busy = 0; uint32_t max_iters = 0; uint32_t min_remaining = 0; static struct option opts[] = { {"debug", 0, 0, 0x100}, {"max_iters", 1, 0, 0x101}, {"min_remaining", 1, 0, 0x102}, + {"abort_if_busy", 0, 0, 0x103}, {"live", 0, 0, 0x200}, COMMON_LONG_OPTS }; @@ -585,6 +598,9 @@ int main_migrate(int argc, char **argv) case 0x102: /* --min_remaining */ min_remaining = atoi(optarg); break; + case 0x103: /* --abort_if_busy */ + abort_if_busy = 1; + break; case 0x200: /* --live */ /* ignored for compatibility with xm */ break; @@ -619,7 +635,7 @@ int main_migrate(int argc, char **argv) pause_after_migration ? " -p" : ""); } - migrate_domain(domid, preserve_domid, rune, debug, + migrate_domain(domid, preserve_domid, rune, debug, abort_if_busy, max_iters, min_remaining, config_filename); return EXIT_SUCCESS; }
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