[{"id":1772652,"web_url":"http://patchwork.ozlabs.org/comment/1772652/","msgid":"<20170921101608.GA2717@work-vm>","list_archive_url":null,"date":"2017-09-21T10:16:09","subject":"Re: [Qemu-devel] [PATCH v10 06/10] migration: add postcopy\n\tblocktime ctx into MigrationIncomingState","submitter":{"id":48102,"url":"http://patchwork.ozlabs.org/api/people/48102/","name":"Dr. David Alan Gilbert","email":"dgilbert@redhat.com"},"content":"* Alexey Perevalov (a.perevalov@samsung.com) wrote:\n> This patch adds request to kernel space for UFFD_FEATURE_THREAD_ID,\n> in case when this feature is provided by kernel.\n> \n> PostcopyBlocktimeContext is incapsulated inside postcopy-ram.c,\n> due to it's postcopy only feature.\n> Also it defines PostcopyBlocktimeContext's instance live time.\n> Information from PostcopyBlocktimeContext instance will be provided\n> much after postcopy migration end, instance of PostcopyBlocktimeContext\n> will live till QEMU exit, but part of it (vcpu_addr,\n> page_fault_vcpu_time) used only during calculation, will be released\n> when postcopy ended or failed.\n> \n> To enable postcopy blocktime calculation on destination, need to request\n> proper capabiltiy (Patch for documentation will be at the tail of the patch\n> set).\n> \n> As an example following command enable that capability, assume QEMU was\n> started with\n> -chardev socket,id=charmonitor,path=/var/lib/migrate-vm-monitor.sock\n> option to control it\n> \n> [root@host]#printf \"{\\\"execute\\\" : \\\"qmp_capabilities\\\"}\\r\\n \\\n> {\\\"execute\\\": \\\"migrate-set-capabilities\\\" , \\\"arguments\\\": {\n> \\\"capabilities\\\": [ { \\\"capability\\\": \\\"postcopy-blocktime\\\", \\\"state\\\":\n> true } ] } }\" | nc -U /var/lib/migrate-vm-monitor.sock\n> \n> Or just with HMP\n> (qemu) migrate_set_capability postcopy-blocktime on\n> \n> Signed-off-by: Alexey Perevalov \n> ---\n> migration/migration.h | 8 ++++++\n> migration/postcopy-ram.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++\n> 2 files changed, 73 insertions(+)\n> \n> diff --git a/migration/migration.h b/migration/migration.h\n> index 56bf33c..770466b 100644\n> --- a/migration/migration.h\n> +++ b/migration/migration.h\n> @@ -21,6 +21,8 @@\n> #include \"qemu/coroutine_int.h\"\n> #include \"hw/qdev.h\"\n> \n> +struct PostcopyBlocktimeContext;\n> +\n> /* State for the incoming migration */\n> struct MigrationIncomingState {\n> QEMUFile *from_src_file;\n> @@ -58,6 +60,12 @@ struct MigrationIncomingState {\n> /* The coroutine we should enter (back) after failover */\n> Coroutine *migration_incoming_co;\n> QemuSemaphore colo_incoming_sem;\n> +\n> + /*\n> + * PostcopyBlocktimeContext to keep information for postcopy\n> + * live migration, to calculate vCPU block time\n> + * */\n> + struct PostcopyBlocktimeContext *blocktime_ctx;\n> };\n> \n> MigrationIncomingState *migration_incoming_get_current(void);\n> diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c\n> index bec6c2c..cc78981 100644\n> --- a/migration/postcopy-ram.c\n> +++ b/migration/postcopy-ram.c\n> @@ -61,6 +61,58 @@ struct PostcopyDiscardState {\n> #include \n> #include \n> \n> +typedef struct PostcopyBlocktimeContext {\n> + /* time when page fault initiated per vCPU */\n> + int64_t *page_fault_vcpu_time;\n> + /* page address per vCPU */\n> + uint64_t *vcpu_addr;\n> + int64_t total_blocktime;\n> + /* blocktime per vCPU */\n> + int64_t *vcpu_blocktime;\n> + /* point in time when last page fault was initiated */\n> + int64_t last_begin;\n> + /* number of vCPU are suspended */\n> + int smp_cpus_down;\n> +\n> + /*\n> + * Handler for exit event, necessary for\n> + * releasing whole blocktime_ctx\n> + */\n> + Notifier exit_notifier;\n> + /*\n> + * Handler for postcopy event, necessary for\n> + * releasing unnecessary part of blocktime_ctx\n> + */\n> + Notifier postcopy_notifier;\n\nIs this actually used? It's just that...\n\n> +} PostcopyBlocktimeContext;\n> +\n> +static void destroy_blocktime_context(struct PostcopyBlocktimeContext *ctx)\n> +{\n> + g_free(ctx->page_fault_vcpu_time);\n> + g_free(ctx->vcpu_addr);\n> + g_free(ctx->vcpu_blocktime);\n> + g_free(ctx);\n> +}\n> +\n> +static void migration_exit_cb(Notifier *n, void *data)\n> +{\n> + PostcopyBlocktimeContext *ctx = container_of(n, PostcopyBlocktimeContext,\n> + exit_notifier);\n> + destroy_blocktime_context(ctx);\n> +}\n> +\n> +static struct PostcopyBlocktimeContext *blocktime_context_new(void)\n> +{\n> + PostcopyBlocktimeContext *ctx = g_new0(PostcopyBlocktimeContext, 1);\n> + ctx->page_fault_vcpu_time = g_new0(int64_t, smp_cpus);\n> + ctx->vcpu_addr = g_new0(uint64_t, smp_cpus);\n> + ctx->vcpu_blocktime = g_new0(int64_t, smp_cpus);\n> +\n> + ctx->exit_notifier.notify = migration_exit_cb;\n> + qemu_add_exit_notifier(&ctx->exit_notifier);\n> + add_migration_state_change_notifier(&ctx->postcopy_notifier);\n\nPatch 7 removes that line, and I don't see what puts it back;\nand this line doesn't actually set up ctx->postcopy_notifier.\n\nOther than that, it looks OK.\n\nDave\n\n> + return ctx;\n> +}\n> \n> /**\n> * receive_ufd_features: check userfault fd features, to request only supported\n> @@ -153,6 +205,19 @@ static bool ufd_check_and_apply(int ufd, MigrationIncomingState *mis)\n> }\n> }\n> \n> +#ifdef UFFD_FEATURE_THREAD_ID\n> + if (migrate_postcopy_blocktime() && mis &&\n> + UFFD_FEATURE_THREAD_ID & supported_features) {\n> + /* kernel supports that feature */\n> + /* don't create blocktime_context if it exists */\n> + if (!mis->blocktime_ctx) {\n> + mis->blocktime_ctx = blocktime_context_new();\n> + }\n> +\n> + asked_features |= UFFD_FEATURE_THREAD_ID;\n> + }\n> +#endif\n> +\n> /*\n> * request features, even if asked_features is 0, due to\n> * kernel expects UFFD_API before UFFDIO_REGISTER, per\n> -- \n> 1.9.1\n> \n--\nDr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=nongnu.org\n\t(client-ip=2001:4830:134:3::11; helo=lists.gnu.org;\n\tenvelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n\treceiver=)","ext-mx02.extmail.prod.ext.phx2.redhat.com;\n\tdmarc=none (p=none dis=none) header.from=redhat.com","ext-mx02.extmail.prod.ext.phx2.redhat.com;\n\tspf=fail smtp.mailfrom=dgilbert@redhat.com"],"Received":["from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11])\n\t(using TLSv1 with cipher AES256-SHA (256/256 bits))\n\t(No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xyXb643dZz9t49\n\tfor ;\n\tThu, 21 Sep 2017 20:16:50 +1000 (AEST)","from localhost ([::1]:52749 helo=lists.gnu.org)\n\tby lists.gnu.org with esmtp (Exim 4.71) (envelope-from\n\t)\n\tid 1duyXI-0005ji-Lw\n\tfor 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[10.36.117.186])\n\tby smtp.corp.redhat.com (Postfix) with ESMTPS id A333F5EDF8;\n\tThu, 21 Sep 2017 10:16:11 +0000 (UTC)"],"DMARC-Filter":"OpenDMARC Filter v1.3.2 mx1.redhat.com 39881806AC","Date":"Thu, 21 Sep 2017 11:16:09 +0100","From":"\"Dr. David Alan Gilbert\" ","To":"Alexey Perevalov ","Message-ID":"<20170921101608.GA2717@work-vm>","References":"<1505839684-10046-1-git-send-email-a.perevalov@samsung.com>\n\t\n\t<1505839684-10046-7-git-send-email-a.perevalov@samsung.com>","MIME-Version":"1.0","Content-Type":"text/plain; charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"<1505839684-10046-7-git-send-email-a.perevalov@samsung.com>","User-Agent":"Mutt/1.8.3 (2017-05-23)","X-Scanned-By":"MIMEDefang 2.79 on 10.5.11.15","X-Greylist":"Sender IP whitelisted, not delayed by milter-greylist-4.5.16\n\t(mx1.redhat.com [10.5.110.26]);\n\tThu, 21 Sep 2017 10:16:15 +0000 (UTC)","X-detected-operating-system":"by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic]\n\t[fuzzy]","X-Received-From":"209.132.183.28","Subject":"Re: [Qemu-devel] [PATCH v10 06/10] migration: add postcopy\n\tblocktime ctx into MigrationIncomingState","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.21","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Cc":"heetae82.ahn@samsung.com, quintela@redhat.com, qemu-devel@nongnu.org,\n\tpeterx@redhat.com, i.maximets@samsung.com","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"\"Qemu-devel\"\n\t"}},{"id":1772718,"web_url":"http://patchwork.ozlabs.org/comment/1772718/","msgid":"<6b5a0775-d17b-946f-fb28-9e4c8839b789@samsung.com>","list_archive_url":null,"date":"2017-09-21T11:27:45","subject":"Re: [Qemu-devel] [PATCH v10 06/10] migration: add postcopy\n\tblocktime ctx into MigrationIncomingState","submitter":{"id":18164,"url":"http://patchwork.ozlabs.org/api/people/18164/","name":"Alexey Perevalov","email":"a.perevalov@samsung.com"},"content":"On 09/21/2017 01:16 PM, Dr. David Alan Gilbert wrote:\n> * Alexey Perevalov (a.perevalov@samsung.com) wrote:\n>> This patch adds request to kernel space for UFFD_FEATURE_THREAD_ID,\n>> in case when this feature is provided by kernel.\n>>\n>> PostcopyBlocktimeContext is incapsulated inside postcopy-ram.c,\n>> due to it's postcopy only feature.\n>> Also it defines PostcopyBlocktimeContext's instance live time.\n>> Information from PostcopyBlocktimeContext instance will be provided\n>> much after postcopy migration end, instance of PostcopyBlocktimeContext\n>> will live till QEMU exit, but part of it (vcpu_addr,\n>> page_fault_vcpu_time) used only during calculation, will be released\n>> when postcopy ended or failed.\n>>\n>> To enable postcopy blocktime calculation on destination, need to request\n>> proper capabiltiy (Patch for documentation will be at the tail of the patch\n>> set).\n>>\n>> As an example following command enable that capability, assume QEMU was\n>> started with\n>> -chardev socket,id=charmonitor,path=/var/lib/migrate-vm-monitor.sock\n>> option to control it\n>>\n>> [root@host]#printf \"{\\\"execute\\\" : \\\"qmp_capabilities\\\"}\\r\\n \\\n>> {\\\"execute\\\": \\\"migrate-set-capabilities\\\" , \\\"arguments\\\": {\n>> \\\"capabilities\\\": [ { \\\"capability\\\": \\\"postcopy-blocktime\\\", \\\"state\\\":\n>> true } ] } }\" | nc -U /var/lib/migrate-vm-monitor.sock\n>>\n>> Or just with HMP\n>> (qemu) migrate_set_capability postcopy-blocktime on\n>>\n>> Signed-off-by: Alexey Perevalov \n>> ---\n>> migration/migration.h | 8 ++++++\n>> migration/postcopy-ram.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++\n>> 2 files changed, 73 insertions(+)\n>>\n>> diff --git a/migration/migration.h b/migration/migration.h\n>> index 56bf33c..770466b 100644\n>> --- a/migration/migration.h\n>> +++ b/migration/migration.h\n>> @@ -21,6 +21,8 @@\n>> #include \"qemu/coroutine_int.h\"\n>> #include \"hw/qdev.h\"\n>> \n>> +struct PostcopyBlocktimeContext;\n>> +\n>> /* State for the incoming migration */\n>> struct MigrationIncomingState {\n>> QEMUFile *from_src_file;\n>> @@ -58,6 +60,12 @@ struct MigrationIncomingState {\n>> /* The coroutine we should enter (back) after failover */\n>> Coroutine *migration_incoming_co;\n>> QemuSemaphore colo_incoming_sem;\n>> +\n>> + /*\n>> + * PostcopyBlocktimeContext to keep information for postcopy\n>> + * live migration, to calculate vCPU block time\n>> + * */\n>> + struct PostcopyBlocktimeContext *blocktime_ctx;\n>> };\n>> \n>> MigrationIncomingState *migration_incoming_get_current(void);\n>> diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c\n>> index bec6c2c..cc78981 100644\n>> --- a/migration/postcopy-ram.c\n>> +++ b/migration/postcopy-ram.c\n>> @@ -61,6 +61,58 @@ struct PostcopyDiscardState {\n>> #include \n>> #include \n>> \n>> +typedef struct PostcopyBlocktimeContext {\n>> + /* time when page fault initiated per vCPU */\n>> + int64_t *page_fault_vcpu_time;\n>> + /* page address per vCPU */\n>> + uint64_t *vcpu_addr;\n>> + int64_t total_blocktime;\n>> + /* blocktime per vCPU */\n>> + int64_t *vcpu_blocktime;\n>> + /* point in time when last page fault was initiated */\n>> + int64_t last_begin;\n>> + /* number of vCPU are suspended */\n>> + int smp_cpus_down;\n>> +\n>> + /*\n>> + * Handler for exit event, necessary for\n>> + * releasing whole blocktime_ctx\n>> + */\n>> + Notifier exit_notifier;\n>> + /*\n>> + * Handler for postcopy event, necessary for\n>> + * releasing unnecessary part of blocktime_ctx\n>> + */\n>> + Notifier postcopy_notifier;\n> Is this actually used? It's just that...\n>\n>> +} PostcopyBlocktimeContext;\n>> +\n>> +static void destroy_blocktime_context(struct PostcopyBlocktimeContext *ctx)\n>> +{\n>> + g_free(ctx->page_fault_vcpu_time);\n>> + g_free(ctx->vcpu_addr);\n>> + g_free(ctx->vcpu_blocktime);\n>> + g_free(ctx);\n>> +}\n>> +\n>> +static void migration_exit_cb(Notifier *n, void *data)\n>> +{\n>> + PostcopyBlocktimeContext *ctx = container_of(n, PostcopyBlocktimeContext,\n>> + exit_notifier);\n>> + destroy_blocktime_context(ctx);\n>> +}\n>> +\n>> +static struct PostcopyBlocktimeContext *blocktime_context_new(void)\n>> +{\n>> + PostcopyBlocktimeContext *ctx = g_new0(PostcopyBlocktimeContext, 1);\n>> + ctx->page_fault_vcpu_time = g_new0(int64_t, smp_cpus);\n>> + ctx->vcpu_addr = g_new0(uint64_t, smp_cpus);\n>> + ctx->vcpu_blocktime = g_new0(int64_t, smp_cpus);\n>> +\n>> + ctx->exit_notifier.notify = migration_exit_cb;\n>> + qemu_add_exit_notifier(&ctx->exit_notifier);\n>> + add_migration_state_change_notifier(&ctx->postcopy_notifier);\n> Patch 7 removes that line, and I don't see what puts it back;\n> and this line doesn't actually set up ctx->postcopy_notifier.\n>\n> Other than that, it looks OK.\nThank you, I really changed my mind, and decided to keep\nblocktime context (and all calculated values) till the\nstop of VM, but not till the end of migration.","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@bilbo.ozlabs.org","Authentication-Results":"ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=nongnu.org\n\t(client-ip=2001:4830:134:3::11; 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