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[99.254.114.190]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6d19c57c1ffsm22802276d6.89.2024.10.30.08.57.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Oct 2024 08:57:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1730303874; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=gLN0f4cofvuVt5w14C5bOhSxhfhHTWPcx/PY6JtfmaI=; b=LjRjPsxGWhxXRPyHcP1AXqQwHKqxb5p9Sr/lwUCBEjLA+TaHtEBP/8oajIZNwEn+X9MSpg gwAwBDePDWoytyWLebKRuopp3d1sfbfjYTv8PKj3bGZlU2Wjq/chE3Hawmm56pwR85cIAs /xfXogDi1Hhhy1xhyJQhRU09nJGH5w0= X-MC-Unique: so2wkUe_NHmAcLrDJ4D35w-1 X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1730303871; x=1730908671; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=gLN0f4cofvuVt5w14C5bOhSxhfhHTWPcx/PY6JtfmaI=; b=fByQVMTkSF7bU27tb8QNgxhIMMgzcebCn+4Gia1wifGelct9xl7/g3pmDBShF+XKe4 W47GNn3SqS83zIWd4VvM5E8wJVhGcUZZClXMpqZLmwIc9F4DBHl65IShRJjYtVgCAaic TLMZgogmNti6uTGY/bCcr9OdwZuevwiTC6VCCQGZPelfDXAuE8mzh0wtXdEMjvHyGgbZ aAWRM1O81Vg0oNfmVo9fHn0YvfG2URB6n5qWbIwebqnpe0WuMxtWOV+iPBRq+UUP5Nso Xb8FVh2ufHrg39wrOqxcJeSpO+wb7ELca7fua6GqTftytSuIAZ/ily4U8hmYxOLugvay ZPMg== X-Gm-Message-State: AOJu0Yywkgc+xsoe+wa9HaZTEosVlFAlJtlpVFAT5SgZfuLCAG4hZW1s CD7XMg11YCpuurHt3VG9Q1DhDalG+X4n1ScaaCHyNsEpdMFLRmdXUSy+B8++jAxXda9us7/8TxB 22sqzoQqQ0mVSil1Nzll2/erCqsLkwHjpWOkNUd0YLo+NrauArEsS+AWaB5ol17pXCIlz91OQr6 CwrdYg0r4p26yZH7Das0gLAG52ogyRY3Webg== X-Received: by 2002:a05:6808:13d2:b0:3e6:2ae7:a2a4 with SMTP id 5614622812f47-3e6384ce490mr12940905b6e.44.1730303871007; Wed, 30 Oct 2024 08:57:51 -0700 (PDT) X-Google-Smtp-Source: AGHT+IHk1OezfiDMmVDAxXFgPiS1aYvSubfil7QFlAu/XczRVBzR4qS+d9OqavvKcm+27frMuW/giA== X-Received: by 2002:a05:6808:13d2:b0:3e6:2ae7:a2a4 with SMTP id 5614622812f47-3e6384ce490mr12940877b6e.44.1730303870561; Wed, 30 Oct 2024 08:57:50 -0700 (PDT) From: Peter Xu To: qemu-devel@nongnu.org Cc: Fabiano Rosas , Peter Maydell , Hyman Huang , Peter Xu Subject: [PULL 08/18] migration: Support periodic RAMBlock dirty bitmap sync Date: Wed, 30 Oct 2024 11:57:24 -0400 Message-ID: <20241030155734.2141398-9-peterx@redhat.com> X-Mailer: git-send-email 2.45.0 In-Reply-To: <20241030155734.2141398-1-peterx@redhat.com> References: <20241030155734.2141398-1-peterx@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=peterx@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.366, 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_H2=-0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1730303890198116600 Content-Type: text/plain; charset="utf-8" From: Hyman Huang When VM is configured with huge memory, the current throttle logic doesn't look like to scale, because migration_trigger_throttle() is only called for each iteration, so it won't be invoked for a long time if one iteration can take a long time. The periodic dirty sync aims to fix the above issue by synchronizing the ramblock from remote dirty bitmap and, when necessary, triggering the CPU throttle multiple times during a long iteration. This is a trade-off between synchronization overhead and CPU throttle impact. Signed-off-by: Hyman Huang Reviewed-by: Fabiano Rosas Link: https://lore.kernel.org/r/f61f1b3653f2acf026901103e1c73d157d38b08f.17= 29146786.git.yong.huang@smartx.com [peterx: make prev_cnt global, and reset for each migration] Signed-off-by: Peter Xu --- migration/cpu-throttle.h | 14 ++++++++ migration/migration.h | 1 + migration/cpu-throttle.c | 70 +++++++++++++++++++++++++++++++++++++++- migration/migration.c | 14 ++++++-- migration/ram.c | 2 +- migration/trace-events | 1 + 6 files changed, 98 insertions(+), 4 deletions(-) diff --git a/migration/cpu-throttle.h b/migration/cpu-throttle.h index d65bdef6d0..420702b8d3 100644 --- a/migration/cpu-throttle.h +++ b/migration/cpu-throttle.h @@ -65,4 +65,18 @@ bool cpu_throttle_active(void); */ int cpu_throttle_get_percentage(void); =20 +/** + * cpu_throttle_dirty_sync_timer_tick: + * + * Dirty sync timer hook. + */ +void cpu_throttle_dirty_sync_timer_tick(void *opaque); + +/** + * cpu_throttle_dirty_sync_timer: + * + * Start or stop the dirty sync timer. + */ +void cpu_throttle_dirty_sync_timer(bool enable); + #endif /* SYSEMU_CPU_THROTTLE_H */ diff --git a/migration/migration.h b/migration/migration.h index b9ce5aa4ff..7dc59c5e8d 100644 --- a/migration/migration.h +++ b/migration/migration.h @@ -551,4 +551,5 @@ int migration_rp_wait(MigrationState *s); */ void migration_rp_kick(MigrationState *s); =20 +void migration_bitmap_sync_precopy(bool last_stage); #endif diff --git a/migration/cpu-throttle.c b/migration/cpu-throttle.c index fa47ee2e21..3df287d8d3 100644 --- a/migration/cpu-throttle.c +++ b/migration/cpu-throttle.c @@ -28,16 +28,23 @@ #include "qemu/main-loop.h" #include "sysemu/cpus.h" #include "cpu-throttle.h" +#include "migration.h" +#include "migration-stats.h" #include "trace.h" =20 /* vcpu throttling controls */ -static QEMUTimer *throttle_timer; +static QEMUTimer *throttle_timer, *throttle_dirty_sync_timer; static unsigned int throttle_percentage; +static bool throttle_dirty_sync_timer_active; +static uint64_t throttle_dirty_sync_count_prev; =20 #define CPU_THROTTLE_PCT_MIN 1 #define CPU_THROTTLE_PCT_MAX 99 #define CPU_THROTTLE_TIMESLICE_NS 10000000 =20 +/* Making sure RAMBlock dirty bitmap is synchronized every five seconds */ +#define CPU_THROTTLE_DIRTY_SYNC_TIMESLICE_MS 5000 + static void cpu_throttle_thread(CPUState *cpu, run_on_cpu_data opaque) { double pct; @@ -112,6 +119,7 @@ void cpu_throttle_set(int new_throttle_pct) void cpu_throttle_stop(void) { qatomic_set(&throttle_percentage, 0); + cpu_throttle_dirty_sync_timer(false); } =20 bool cpu_throttle_active(void) @@ -124,8 +132,68 @@ int cpu_throttle_get_percentage(void) return qatomic_read(&throttle_percentage); } =20 +void cpu_throttle_dirty_sync_timer_tick(void *opaque) +{ + uint64_t sync_cnt =3D stat64_get(&mig_stats.dirty_sync_count); + + /* + * The first iteration copies all memory anyhow and has no + * effect on guest performance, therefore omit it to avoid + * paying extra for the sync penalty. + */ + if (sync_cnt <=3D 1) { + goto end; + } + + if (sync_cnt =3D=3D throttle_dirty_sync_count_prev) { + trace_cpu_throttle_dirty_sync(); + WITH_RCU_READ_LOCK_GUARD() { + migration_bitmap_sync_precopy(false); + } + } + +end: + throttle_dirty_sync_count_prev =3D stat64_get(&mig_stats.dirty_sync_co= unt); + + timer_mod(throttle_dirty_sync_timer, + qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL_RT) + + CPU_THROTTLE_DIRTY_SYNC_TIMESLICE_MS); +} + +static bool cpu_throttle_dirty_sync_active(void) +{ + return qatomic_read(&throttle_dirty_sync_timer_active); +} + +void cpu_throttle_dirty_sync_timer(bool enable) +{ + assert(throttle_dirty_sync_timer); + + if (enable) { + if (!cpu_throttle_dirty_sync_active()) { + /* + * Always reset the dirty sync count cache, in case migration + * was cancelled once. + */ + throttle_dirty_sync_count_prev =3D 0; + timer_mod(throttle_dirty_sync_timer, + qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL_RT) + + CPU_THROTTLE_DIRTY_SYNC_TIMESLICE_MS); + qatomic_set(&throttle_dirty_sync_timer_active, 1); + } + } else { + if (cpu_throttle_dirty_sync_active()) { + timer_del(throttle_dirty_sync_timer); + qatomic_set(&throttle_dirty_sync_timer_active, 0); + } + } +} + void cpu_throttle_init(void) { throttle_timer =3D timer_new_ns(QEMU_CLOCK_VIRTUAL_RT, cpu_throttle_timer_tick, NULL); + throttle_dirty_sync_timer =3D + timer_new_ms(QEMU_CLOCK_VIRTUAL_RT, + cpu_throttle_dirty_sync_timer_tick, NULL); } diff --git a/migration/migration.c b/migration/migration.c index 05c8cd50b4..bcb735869b 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -3297,12 +3297,17 @@ static MigIterateState migration_iteration_run(Migr= ationState *s) =20 static void migration_iteration_finish(MigrationState *s) { - /* If we enabled cpu throttling for auto-converge, turn it off. */ + bql_lock(); + + /* + * If we enabled cpu throttling for auto-converge, turn it off. + * Stopping CPU throttle should be serialized by BQL to avoid + * racing for the throttle_dirty_sync_timer. + */ if (migrate_auto_converge()) { cpu_throttle_stop(); } =20 - bql_lock(); switch (s->state) { case MIGRATION_STATUS_COMPLETED: runstate_set(RUN_STATE_POSTMIGRATE); @@ -3520,6 +3525,11 @@ static void *migration_thread(void *opaque) qemu_savevm_send_colo_enable(s->to_dst_file); } =20 + if (migrate_auto_converge()) { + /* Start RAMBlock dirty bitmap sync timer */ + cpu_throttle_dirty_sync_timer(true); + } + bql_lock(); ret =3D qemu_savevm_state_setup(s->to_dst_file, &local_err); bql_unlock(); diff --git a/migration/ram.c b/migration/ram.c index 9b5b350405..d284f63854 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -1088,7 +1088,7 @@ static void migration_bitmap_sync(RAMState *rs, bool = last_stage) } } =20 -static void migration_bitmap_sync_precopy(bool last_stage) +void migration_bitmap_sync_precopy(bool last_stage) { Error *local_err =3D NULL; assert(ram_state); diff --git a/migration/trace-events b/migration/trace-events index 9a19599804..0638183056 100644 --- a/migration/trace-events +++ b/migration/trace-events @@ -381,3 +381,4 @@ migration_pagecache_insert(void) "Error allocating page" =20 # cpu-throttle.c cpu_throttle_set(int new_throttle_pct) "set guest CPU throttled by %d%%" +cpu_throttle_dirty_sync(void) "" --=20 2.45.0