From patchwork Wed Jun 7 15:30:50 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: ~hyman X-Patchwork-Id: 1797672 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=) 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 4QmFQr2BcQz20Wk for ; Wed, 21 Jun 2023 17:25:40 +1000 (AEST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qBsCX-0007Lk-KW; Wed, 21 Jun 2023 03:24:25 -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 1qBsCP-0007K4-SA for qemu-devel@nongnu.org; Wed, 21 Jun 2023 03:24:19 -0400 Received: from mail-b.sr.ht ([173.195.146.151]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qBsCM-0005HF-SD for qemu-devel@nongnu.org; Wed, 21 Jun 2023 03:24:17 -0400 Authentication-Results: mail-b.sr.ht; dkim=none Received: from git.sr.ht (unknown [173.195.146.142]) by mail-b.sr.ht (Postfix) with ESMTPSA id D9CA911F0FC; Wed, 21 Jun 2023 07:24:13 +0000 (UTC) From: ~hyman Date: Wed, 07 Jun 2023 23:30:50 +0800 Subject: [PATCH QEMU v6 4/9] migration: Introduce dirty-limit capability MIME-Version: 1.0 Message-ID: <168733225273.5845.15871826788879741674-4@git.sr.ht> X-Mailer: git.sr.ht In-Reply-To: <168733225273.5845.15871826788879741674-0@git.sr.ht> To: qemu-devel Cc: Juan Quintela , Peter Xu , Paolo Bonzini , "Dr. David Alan Gilbert" , Eric Blake , Markus Armbruster , Thomas Huth , Laurent Vivier , Richard Henderson , Philippe =?utf-8?q?Mathie?= =?utf-8?q?u-Daud=C3=A9?= , hyman Received-SPF: pass client-ip=173.195.146.151; envelope-from=outgoing@sr.ht; helo=mail-b.sr.ht X-Spam_score_int: 15 X-Spam_score: 1.5 X-Spam_bar: + X-Spam_report: (1.5 / 5.0 requ) BAYES_00=-1.9, DATE_IN_PAST_96_XX=3.405, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no 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: , Reply-To: ~hyman 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) Introduce migration dirty-limit capability, which can be turned on before live migration and limit dirty page rate durty live migration. Introduce migrate_dirty_limit function to help check if dirty-limit capability enabled during live migration. Meanwhile, refactor vcpu_dirty_rate_stat_collect so that period can be configured instead of hardcoded. dirty-limit capability is kind of like auto-converge but using dirty limit instead of traditional cpu-throttle to throttle guest down. To enable this feature, turn on the dirty-limit capability before live migration using migrate-set-capabilities, and set the parameters "x-vcpu-dirty-limit-period", "vcpu-dirty-limit" suitably to speed up convergence. Signed-off-by: Hyman Huang(黄勇) Acked-by: Peter Xu Reviewed-by: Juan Quintela --- migration/options.c | 23 +++++++++++++++++++++++ migration/options.h | 1 + qapi/migration.json | 12 +++++++++++- softmmu/dirtylimit.c | 12 +++++++++++- 4 files changed, 46 insertions(+), 2 deletions(-) diff --git a/migration/options.c b/migration/options.c index 8acf5f1d2c..ba1010e08b 100644 --- a/migration/options.c +++ b/migration/options.c @@ -27,6 +27,7 @@ #include "qemu-file.h" #include "ram.h" #include "options.h" +#include "sysemu/kvm.h" /* Maximum migrate downtime set to 2000 seconds */ #define MAX_MIGRATE_DOWNTIME_SECONDS 2000 @@ -194,6 +195,7 @@ Property migration_properties[] = { DEFINE_PROP_MIG_CAP("x-zero-copy-send", MIGRATION_CAPABILITY_ZERO_COPY_SEND), #endif + DEFINE_PROP_MIG_CAP("x-dirty-limit", MIGRATION_CAPABILITY_DIRTY_LIMIT), DEFINE_PROP_END_OF_LIST(), }; @@ -240,6 +242,13 @@ bool migrate_dirty_bitmaps(void) return s->capabilities[MIGRATION_CAPABILITY_DIRTY_BITMAPS]; } +bool migrate_dirty_limit(void) +{ + MigrationState *s = migrate_get_current(); + + return s->capabilities[MIGRATION_CAPABILITY_DIRTY_LIMIT]; +} + bool migrate_events(void) { MigrationState *s = migrate_get_current(); @@ -556,6 +565,20 @@ bool migrate_caps_check(bool *old_caps, bool *new_caps, Error **errp) } } + if (new_caps[MIGRATION_CAPABILITY_DIRTY_LIMIT]) { + if (new_caps[MIGRATION_CAPABILITY_AUTO_CONVERGE]) { + error_setg(errp, "dirty-limit conflicts with auto-converge" + " either of then available currently"); + return false; + } + + if (!kvm_enabled() || !kvm_dirty_ring_enabled()) { + error_setg(errp, "dirty-limit requires KVM with accelerator" + " property 'dirty-ring-size' set"); + return false; + } + } + return true; } diff --git a/migration/options.h b/migration/options.h index 45991af3c2..6f0d837932 100644 --- a/migration/options.h +++ b/migration/options.h @@ -24,6 +24,7 @@ extern Property migration_properties[]; /* capabilities */ bool migrate_auto_converge(void); +bool migrate_dirty_limit(void); bool migrate_background_snapshot(void); bool migrate_block(void); bool migrate_colo(void); diff --git a/qapi/migration.json b/qapi/migration.json index e7243c0c0d..621e6604c6 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -487,6 +487,16 @@ # and should not affect the correctness of postcopy migration. # (since 7.1) # +# @dirty-limit: If enabled, migration will use the dirty-limit algo to +# throttle down guest instead of auto-converge algo. +# Throttle algo only works when vCPU's dirtyrate greater +# than 'vcpu-dirty-limit', read processes in guest os +# aren't penalized any more, so this algo can improve +# performance of vCPU during live migration. This is an +# optional performance feature and should not affect the +# correctness of the existing auto-converge algo. +# (since 8.1) +# # Features: # # @unstable: Members @x-colo and @x-ignore-shared are experimental. @@ -502,7 +512,7 @@ 'dirty-bitmaps', 'postcopy-blocktime', 'late-block-activate', { 'name': 'x-ignore-shared', 'features': [ 'unstable' ] }, 'validate-uuid', 'background-snapshot', - 'zero-copy-send', 'postcopy-preempt'] } + 'zero-copy-send', 'postcopy-preempt', 'dirty-limit'] } ## # @MigrationCapabilityStatus: diff --git a/softmmu/dirtylimit.c b/softmmu/dirtylimit.c index 5c12d26d49..953ef934bc 100644 --- a/softmmu/dirtylimit.c +++ b/softmmu/dirtylimit.c @@ -24,6 +24,9 @@ #include "hw/boards.h" #include "sysemu/kvm.h" #include "trace.h" +#include "migration/misc.h" +#include "migration/migration.h" +#include "migration/options.h" /* * Dirtylimit stop working if dirty page rate error @@ -75,11 +78,18 @@ static bool dirtylimit_quit; static void vcpu_dirty_rate_stat_collect(void) { + MigrationState *s = migrate_get_current(); VcpuStat stat; int i = 0; + int64_t period = DIRTYLIMIT_CALC_TIME_MS; + + if (migrate_dirty_limit() && + migration_is_active(s)) { + period = s->parameters.x_vcpu_dirty_limit_period; + } /* calculate vcpu dirtyrate */ - vcpu_calculate_dirtyrate(DIRTYLIMIT_CALC_TIME_MS, + vcpu_calculate_dirtyrate(period, &stat, GLOBAL_DIRTY_LIMIT, false);