From: Wei Yang <richard.weiyang@huawei.com> To: "Li, Liang Z" <liang.z.li@intel.com> Cc: "rkagan@virtuozzo.com" <rkagan@virtuozzo.com>, "linux-kernel@vger.kenel.org" <linux-kernel@vger.kenel.org>, "ehabkost@redhat.com" <ehabkost@redhat.com>, "kvm@vger.kernel.org" <kvm@vger.kernel.org>, "mst@redhat.com" <mst@redhat.com>, "simhan@hpe.com" <simhan@hpe.com>, "quintela@redhat.com" <quintela@redhat.com>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, "jitendra.kolhe@hpe.com" <jitendra.kolhe@hpe.com>, "mohan_parthasarathy@hpe.com" <mohan_parthasarathy@hpe.com>, "amit.shah@redhat.com" <amit.shah@redhat.com>, "pbonzini@redhat.com" <pbonzini@redhat.com>, "rth@twiddle.net" <rth@twiddle.net> Subject: Re: [RFC Design Doc]Speed up live migration by skipping free pages Date: Thu, 24 Mar 2016 09:24:24 +0800 [thread overview] Message-ID: <20160324012424.GB14956@linux-gk3p> (raw) In-Reply-To: <F2CBF3009FA73547804AE4C663CAB28E04159C9C@shsmsx102.ccr.corp.intel.com> On Wed, Mar 23, 2016 at 06:48:22AM +0000, Li, Liang Z wrote: [...] >> > 8. Pseudo code >> > Dirty page logging should be enabled before getting the free page >> > information from guest, this is important because during the process >> > of getting free pages, some free pages may be used and written by the >> > guest, dirty page logging can trace these pages. The pseudo code is >> > like below: >> > >> > ----------------------------------------------- >> > MigrationState *s = migrate_get_current(); >> > ... >> > >> > memory_global_dirty_log_start(); >> > >> > if (get_guest_mem_info(&info)) { >> > while (!get_free_page_bmap(free_page_bitmap, drop_page_cache) >> && >> > s->state != MIGRATION_STATUS_CANCELLING) { >> > usleep(1000) // sleep for 1 ms >> > } >> > >> > tighten_free_page_bmap = >> tighten_guest_free_pages(free_page_bitmap); >> > filter_out_guest_free_pages(tighten_free_page_bmap); >> > } >> >> Given the typical speed of networks; it wouldn't do too much harm to start >> sending assuming all pages are dirty and then when the guest finally gets >> around to finishing the bitmap then update, so it's asynchronous - and then if >> the guest never responds we don't really care. > >Indeed, thanks! > This is interesting. By doing so, the threshold I mentioned in another mail is not necessary, since we can do it in parallel. >Liang >> >> Dave >> >> > >> > migration_bitmap_sync(); >> > ... >> > >> > ----------------------------------------------- >> > >> > >> > -- >> > 1.9.1 >> > >> -- >> Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK >N�����r��y���b�X��ǧv�^�){.n�+����h��\x17��ܨ}���Ơz�&j:+v���\a����zZ+��+zf���h���~����i���z�\x1e�w���?����&�)ߢ^[f -- Richard Yang\nHelp you, Help me
WARNING: multiple messages have this Message-ID (diff)
From: Wei Yang <richard.weiyang@huawei.com> To: "Li, Liang Z" <liang.z.li@intel.com> Cc: "rkagan@virtuozzo.com" <rkagan@virtuozzo.com>, "linux-kernel@vger.kenel.org" <linux-kernel@vger.kenel.org>, "ehabkost@redhat.com" <ehabkost@redhat.com>, "kvm@vger.kernel.org" <kvm@vger.kernel.org>, "mst@redhat.com" <mst@redhat.com>, "simhan@hpe.com" <simhan@hpe.com>, "quintela@redhat.com" <quintela@redhat.com>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, "jitendra.kolhe@hpe.com" <jitendra.kolhe@hpe.com>, "mohan_parthasarathy@hpe.com" <mohan_parthasarathy@hpe.com>, "amit.shah@redhat.com" <amit.shah@redhat.com>, "pbonzini@redhat.com" <pbonzini@redhat.com>, "rth@twiddle.net" <rth@twiddle.net> Subject: Re: [Qemu-devel] [RFC Design Doc]Speed up live migration by skipping free pages Date: Thu, 24 Mar 2016 09:24:24 +0800 [thread overview] Message-ID: <20160324012424.GB14956@linux-gk3p> (raw) In-Reply-To: <F2CBF3009FA73547804AE4C663CAB28E04159C9C@shsmsx102.ccr.corp.intel.com> On Wed, Mar 23, 2016 at 06:48:22AM +0000, Li, Liang Z wrote: [...] >> > 8. Pseudo code >> > Dirty page logging should be enabled before getting the free page >> > information from guest, this is important because during the process >> > of getting free pages, some free pages may be used and written by the >> > guest, dirty page logging can trace these pages. The pseudo code is >> > like below: >> > >> > ----------------------------------------------- >> > MigrationState *s = migrate_get_current(); >> > ... >> > >> > memory_global_dirty_log_start(); >> > >> > if (get_guest_mem_info(&info)) { >> > while (!get_free_page_bmap(free_page_bitmap, drop_page_cache) >> && >> > s->state != MIGRATION_STATUS_CANCELLING) { >> > usleep(1000) // sleep for 1 ms >> > } >> > >> > tighten_free_page_bmap = >> tighten_guest_free_pages(free_page_bitmap); >> > filter_out_guest_free_pages(tighten_free_page_bmap); >> > } >> >> Given the typical speed of networks; it wouldn't do too much harm to start >> sending assuming all pages are dirty and then when the guest finally gets >> around to finishing the bitmap then update, so it's asynchronous - and then if >> the guest never responds we don't really care. > >Indeed, thanks! > This is interesting. By doing so, the threshold I mentioned in another mail is not necessary, since we can do it in parallel. >Liang >> >> Dave >> >> > >> > migration_bitmap_sync(); >> > ... >> > >> > ----------------------------------------------- >> > >> > >> > -- >> > 1.9.1 >> > >> -- >> Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK >N�����r��y���b�X��ǧv�^�){.n�+����h��\x17��ܨ}���Ơz�&j:+v���\a����zZ+��+zf���h���~����i���z�\x1e�w���?����&�)ߢ^[f -- Richard Yang\nHelp you, Help me
next prev parent reply other threads:[~2016-03-24 1:24 UTC|newest] Thread overview: 112+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-03-22 7:43 [RFC Design Doc]Speed up live migration by skipping free pages Liang Li 2016-03-22 7:43 ` [Qemu-devel] " Liang Li 2016-03-22 10:11 ` Michael S. Tsirkin 2016-03-22 10:11 ` [Qemu-devel] " Michael S. Tsirkin 2016-03-23 6:05 ` Li, Liang Z 2016-03-23 6:05 ` [Qemu-devel] " Li, Liang Z 2016-03-23 14:08 ` Michael S. Tsirkin 2016-03-23 14:08 ` [Qemu-devel] " Michael S. Tsirkin 2016-03-24 1:19 ` Li, Liang Z 2016-03-24 1:19 ` [Qemu-devel] " Li, Liang Z 2016-03-24 9:48 ` Michael S. Tsirkin 2016-03-24 9:48 ` [Qemu-devel] " Michael S. Tsirkin 2016-03-24 10:16 ` Li, Liang Z 2016-03-24 10:16 ` [Qemu-devel] " Li, Liang Z 2016-03-24 10:29 ` Michael S. Tsirkin 2016-03-24 10:29 ` [Qemu-devel] " Michael S. Tsirkin 2016-03-24 14:33 ` Li, Liang Z 2016-03-24 14:33 ` [Qemu-devel] " Li, Liang Z 2016-03-24 14:44 ` Michael S. Tsirkin 2016-03-24 14:44 ` [Qemu-devel] " Michael S. Tsirkin 2016-03-24 15:16 ` Li, Liang Z 2016-03-24 15:16 ` [Qemu-devel] " Li, Liang Z 2016-03-24 15:18 ` Paolo Bonzini 2016-03-24 15:18 ` [Qemu-devel] " Paolo Bonzini 2016-03-24 15:25 ` Li, Liang Z 2016-03-24 15:25 ` [Qemu-devel] " Li, Liang Z 2016-03-24 15:27 ` Michael S. Tsirkin 2016-03-24 15:27 ` [Qemu-devel] " Michael S. Tsirkin 2016-03-24 15:39 ` Li, Liang Z 2016-03-24 15:39 ` [Qemu-devel] " Li, Liang Z 2016-03-24 15:47 ` Paolo Bonzini 2016-03-24 15:47 ` [Qemu-devel] " Paolo Bonzini 2016-03-24 15:59 ` Li, Liang Z 2016-03-24 15:59 ` [Qemu-devel] " Li, Liang Z 2016-03-22 19:05 ` Dr. David Alan Gilbert 2016-03-22 19:05 ` [Qemu-devel] " Dr. David Alan Gilbert 2016-03-23 6:48 ` Li, Liang Z 2016-03-23 6:48 ` [Qemu-devel] " Li, Liang Z 2016-03-24 1:24 ` Wei Yang [this message] 2016-03-24 1:24 ` Wei Yang 2016-03-24 9:00 ` Dr. David Alan Gilbert 2016-03-24 9:00 ` [Qemu-devel] " Dr. David Alan Gilbert 2016-03-24 10:09 ` Li, Liang Z 2016-03-24 10:09 ` [Qemu-devel] " Li, Liang Z 2016-03-24 10:23 ` Dr. David Alan Gilbert 2016-03-24 10:23 ` [Qemu-devel] " Dr. David Alan Gilbert 2016-03-24 14:50 ` Li, Liang Z 2016-03-24 14:50 ` [Qemu-devel] " Li, Liang Z 2016-03-24 15:11 ` Michael S. Tsirkin 2016-03-24 15:11 ` [Qemu-devel] " Michael S. Tsirkin 2016-03-24 15:53 ` Li, Liang Z 2016-03-24 15:53 ` [Qemu-devel] " Li, Liang Z 2016-03-24 15:56 ` Michael S. Tsirkin 2016-03-24 15:56 ` [Qemu-devel] " Michael S. Tsirkin 2016-03-24 16:05 ` Li, Liang Z 2016-03-24 16:05 ` [Qemu-devel] " Li, Liang Z 2016-03-24 16:25 ` Michael S. Tsirkin 2016-03-24 16:25 ` [Qemu-devel] " Michael S. Tsirkin 2016-03-24 17:49 ` Dr. David Alan Gilbert 2016-03-24 17:49 ` [Qemu-devel] " Dr. David Alan Gilbert 2016-03-24 22:16 ` Michael S. Tsirkin 2016-03-24 22:16 ` [Qemu-devel] " Michael S. Tsirkin 2016-03-25 1:59 ` Li, Liang Z 2016-03-25 1:59 ` [Qemu-devel] " Li, Liang Z 2016-03-25 1:32 ` Li, Liang Z 2016-03-25 1:32 ` [Qemu-devel] " Li, Liang Z 2016-04-18 11:08 ` Li, Liang Z 2016-04-18 11:08 ` [Qemu-devel] " Li, Liang Z 2016-04-18 11:29 ` Michael S. Tsirkin 2016-04-18 11:29 ` [Qemu-devel] " Michael S. Tsirkin 2016-04-18 14:36 ` Li, Liang Z 2016-04-18 14:36 ` [Qemu-devel] " Li, Liang Z 2016-04-18 15:38 ` Michael S. Tsirkin 2016-04-18 15:38 ` [Qemu-devel] " Michael S. Tsirkin 2016-04-19 2:20 ` Li, Liang Z 2016-04-19 2:20 ` [Qemu-devel] " Li, Liang Z 2016-04-19 19:12 ` Dr. David Alan Gilbert 2016-04-19 19:12 ` [Qemu-devel] " Dr. David Alan Gilbert 2016-04-25 10:56 ` Michael S. Tsirkin 2016-04-25 10:56 ` [Qemu-devel] " Michael S. Tsirkin 2016-04-19 19:05 ` Dr. David Alan Gilbert 2016-04-19 19:05 ` [Qemu-devel] " Dr. David Alan Gilbert 2016-04-20 3:22 ` Li, Liang Z 2016-04-20 3:22 ` [Qemu-devel] " Li, Liang Z 2016-04-20 8:10 ` Dr. David Alan Gilbert 2016-04-20 8:10 ` [Qemu-devel] " Dr. David Alan Gilbert 2016-03-25 1:32 ` Li, Liang Z 2016-03-25 1:32 ` [Qemu-devel] " Li, Liang Z 2016-04-01 10:54 ` Amit Shah 2016-04-01 10:54 ` [Qemu-devel] " Amit Shah 2016-04-05 1:49 ` Li, Liang Z 2016-04-05 1:49 ` [Qemu-devel] " Li, Liang Z 2016-03-23 1:37 ` Wei Yang 2016-03-23 1:37 ` [Qemu-devel] " Wei Yang 2016-03-23 7:18 ` Li, Liang Z 2016-03-23 7:18 ` [Qemu-devel] " Li, Liang Z 2016-03-23 9:46 ` Wei Yang 2016-03-23 9:46 ` [Qemu-devel] " Wei Yang 2016-03-23 14:35 ` Li, Liang Z 2016-03-23 14:35 ` [Qemu-devel] " Li, Liang Z 2016-03-24 0:52 ` Wei Yang 2016-03-24 0:52 ` [Qemu-devel] " Wei Yang 2016-03-24 1:32 ` Li, Liang Z 2016-03-24 1:32 ` [Qemu-devel] " Li, Liang Z 2016-03-24 1:56 ` Wei Yang 2016-03-24 1:56 ` [Qemu-devel] " Wei Yang 2016-03-23 16:53 ` Eric Blake 2016-03-23 16:53 ` Eric Blake 2016-03-23 21:41 ` Wei Yang 2016-03-23 21:41 ` Wei Yang 2016-03-24 1:23 ` Li, Liang Z 2016-03-24 1:23 ` Li, Liang Z
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20160324012424.GB14956@linux-gk3p \ --to=richard.weiyang@huawei.com \ --cc=amit.shah@redhat.com \ --cc=dgilbert@redhat.com \ --cc=ehabkost@redhat.com \ --cc=jitendra.kolhe@hpe.com \ --cc=kvm@vger.kernel.org \ --cc=liang.z.li@intel.com \ --cc=linux-kernel@vger.kenel.org \ --cc=mohan_parthasarathy@hpe.com \ --cc=mst@redhat.com \ --cc=pbonzini@redhat.com \ --cc=qemu-devel@nongnu.org \ --cc=quintela@redhat.com \ --cc=rkagan@virtuozzo.com \ --cc=rth@twiddle.net \ --cc=simhan@hpe.com \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.