From patchwork Mon Jul 24 13:06:22 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Juan Quintela X-Patchwork-Id: 1811800 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: legolas.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=IjwJ0BJK; dkim-atps=neutral Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4R8gSR1lxcz1yYc for ; Mon, 24 Jul 2023 23:07:51 +1000 (AEST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qNvHZ-0004GB-Su; Mon, 24 Jul 2023 09:07:26 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qNvHP-00046v-1i for qemu-devel@nongnu.org; Mon, 24 Jul 2023 09:07:16 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qNvHK-0002ae-2U for qemu-devel@nongnu.org; Mon, 24 Jul 2023 09:07:13 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1690204028; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=u51OtPwfPBL7MdDO5U3j5SvZo8pKrPKFjkFTcGk4gTs=; b=IjwJ0BJK/P5GUGKjAHjcM5CggFq5fOr8SqXeEf7rDkrcqikGrF6nd9pNvPWprkYL9kVSpn 6SqTAYBGmGrJeEPJ5qHBTnEROvEZaB0JKXGYsaM+lZOCGheWDOt+opXlW42Rp5Q2AW/Yr3 2ko8JjtyLdNUuyCeBp5RrfDWYIu7dv4= Received: from mimecast-mx02.redhat.com (66.187.233.73 [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-398-b7dO1pNMMAGkX7462HzWTA-1; Mon, 24 Jul 2023 09:07:03 -0400 X-MC-Unique: b7dO1pNMMAGkX7462HzWTA-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id EC5433C0FCA4; Mon, 24 Jul 2023 13:07:02 +0000 (UTC) Received: from secure.mitica (unknown [10.39.194.115]) by smtp.corp.redhat.com (Postfix) with ESMTP id 22E69F782D; Mon, 24 Jul 2023 13:07:00 +0000 (UTC) From: Juan Quintela To: qemu-devel@nongnu.org Cc: Laurent Vivier , Thomas Huth , Markus Armbruster , libvir-list@redhat.com, Paolo Bonzini , Peter Xu , Eric Blake , Juan Quintela , Leonardo Bras , =?utf-8?b?SHltYW4gSHVhbmco6buE5YuHKQ==?= Subject: [PATCH 09/26] migration: Implement dirty-limit convergence algo Date: Mon, 24 Jul 2023 15:06:22 +0200 Message-Id: <20230724130639.93135-10-quintela@redhat.com> In-Reply-To: <20230724130639.93135-1-quintela@redhat.com> References: <20230724130639.93135-1-quintela@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.5 Received-SPF: pass client-ip=170.10.133.124; envelope-from=quintela@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Hyman Huang(黄勇) Implement dirty-limit convergence algo for live migration, which is kind of like auto-converge algo but using dirty-limit instead of cpu throttle to make migration convergent. Enable dirty page limit if dirty_rate_high_cnt greater than 2 when dirty-limit capability enabled, Disable dirty-limit if migration be canceled. Note that "set_vcpu_dirty_limit", "cancel_vcpu_dirty_limit" commands are not allowed during dirty-limit live migration. Signed-off-by: Hyman Huang(黄勇) Reviewed-by: Markus Armbruster Message-ID: <168733225273.5845.15871826788879741674-7@git.sr.ht> Reviewed-by: Juan Quintela Signed-off-by: Juan Quintela --- migration/migration.c | 3 +++ migration/ram.c | 36 ++++++++++++++++++++++++++++++++++++ softmmu/dirtylimit.c | 29 +++++++++++++++++++++++++++++ migration/trace-events | 1 + 4 files changed, 69 insertions(+) diff --git a/migration/migration.c b/migration/migration.c index ae49d42eab..49332251e8 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -166,6 +166,9 @@ void migration_cancel(const Error *error) if (error) { migrate_set_error(current_migration, error); } + if (migrate_dirty_limit()) { + qmp_cancel_vcpu_dirty_limit(false, -1, NULL); + } migrate_fd_cancel(current_migration); } diff --git a/migration/ram.c b/migration/ram.c index 1d9300f4c5..9040d66e61 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -46,6 +46,7 @@ #include "qapi/error.h" #include "qapi/qapi-types-migration.h" #include "qapi/qapi-events-migration.h" +#include "qapi/qapi-commands-migration.h" #include "qapi/qmp/qerror.h" #include "trace.h" #include "exec/ram_addr.h" @@ -59,6 +60,8 @@ #include "multifd.h" #include "sysemu/runstate.h" #include "options.h" +#include "sysemu/dirtylimit.h" +#include "sysemu/kvm.h" #include "hw/boards.h" /* for machine_dump_guest_core() */ @@ -984,6 +987,37 @@ static void migration_update_rates(RAMState *rs, int64_t end_time) } } +/* + * Enable dirty-limit to throttle down the guest + */ +static void migration_dirty_limit_guest(void) +{ + /* + * dirty page rate quota for all vCPUs fetched from + * migration parameter 'vcpu_dirty_limit' + */ + static int64_t quota_dirtyrate; + MigrationState *s = migrate_get_current(); + + /* + * If dirty limit already enabled and migration parameter + * vcpu-dirty-limit untouched. + */ + if (dirtylimit_in_service() && + quota_dirtyrate == s->parameters.vcpu_dirty_limit) { + return; + } + + quota_dirtyrate = s->parameters.vcpu_dirty_limit; + + /* + * Set all vCPU a quota dirtyrate, note that the second + * parameter will be ignored if setting all vCPU for the vm + */ + qmp_set_vcpu_dirty_limit(false, -1, quota_dirtyrate, NULL); + trace_migration_dirty_limit_guest(quota_dirtyrate); +} + static void migration_trigger_throttle(RAMState *rs) { uint64_t threshold = migrate_throttle_trigger_threshold(); @@ -1013,6 +1047,8 @@ static void migration_trigger_throttle(RAMState *rs) trace_migration_throttle(); mig_throttle_guest_down(bytes_dirty_period, bytes_dirty_threshold); + } else if (migrate_dirty_limit()) { + migration_dirty_limit_guest(); } } } diff --git a/softmmu/dirtylimit.c b/softmmu/dirtylimit.c index 942d876523..a6d854d161 100644 --- a/softmmu/dirtylimit.c +++ b/softmmu/dirtylimit.c @@ -436,6 +436,23 @@ static void dirtylimit_cleanup(void) dirtylimit_state_finalize(); } +/* + * dirty page rate limit is not allowed to set if migration + * is running with dirty-limit capability enabled. + */ +static bool dirtylimit_is_allowed(void) +{ + MigrationState *ms = migrate_get_current(); + + if (migration_is_running(ms->state) && + (!qemu_thread_is_self(&ms->thread)) && + migrate_dirty_limit() && + dirtylimit_in_service()) { + return false; + } + return true; +} + void qmp_cancel_vcpu_dirty_limit(bool has_cpu_index, int64_t cpu_index, Error **errp) @@ -449,6 +466,12 @@ void qmp_cancel_vcpu_dirty_limit(bool has_cpu_index, return; } + if (!dirtylimit_is_allowed()) { + error_setg(errp, "can't cancel dirty page rate limit while" + " migration is running"); + return; + } + if (!dirtylimit_in_service()) { return; } @@ -499,6 +522,12 @@ void qmp_set_vcpu_dirty_limit(bool has_cpu_index, return; } + if (!dirtylimit_is_allowed()) { + error_setg(errp, "can't set dirty page rate limit while" + " migration is running"); + return; + } + if (!dirty_rate) { qmp_cancel_vcpu_dirty_limit(has_cpu_index, cpu_index, errp); return; diff --git a/migration/trace-events b/migration/trace-events index 5259c1044b..580895e86e 100644 --- a/migration/trace-events +++ b/migration/trace-events @@ -93,6 +93,7 @@ migration_bitmap_sync_start(void) "" migration_bitmap_sync_end(uint64_t dirty_pages) "dirty_pages %" PRIu64 migration_bitmap_clear_dirty(char *str, uint64_t start, uint64_t size, unsigned long page) "rb %s start 0x%"PRIx64" size 0x%"PRIx64" page 0x%lx" migration_throttle(void) "" +migration_dirty_limit_guest(int64_t dirtyrate) "guest dirty page rate limit %" PRIi64 " MB/s" ram_discard_range(const char *rbname, uint64_t start, size_t len) "%s: start: %" PRIx64 " %zx" ram_load_loop(const char *rbname, uint64_t addr, int flags, void *host) "%s: addr: 0x%" PRIx64 " flags: 0x%x host: %p" ram_load_postcopy_loop(int channel, uint64_t addr, int flags) "chan=%d addr=0x%" PRIx64 " flags=0x%x"