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Thu, 17 Sep 2020 09:38:44 +0000 (UTC) Date: Thu, 17 Sep 2020 10:38:42 +0100 From: "Dr. David Alan Gilbert" To: Zheng Chuan , jdenemar@redhat.com Subject: Re: [PATCH v10 00/12] *** A Method for evaluating dirty page rate *** Message-ID: <20200917093842.GE2793@work-vm> References: <1600237327-33618-1-git-send-email-zhengchuan@huawei.com> <20200917091504.GD2793@work-vm> <2863327b-67ee-a440-1a2d-e439ecbbeb84@huawei.com> MIME-Version: 1.0 In-Reply-To: <2863327b-67ee-a440-1a2d-e439ecbbeb84@huawei.com> User-Agent: Mutt/1.14.6 (2020-07-11) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dgilbert@redhat.com X-Mimecast-Spam-Score: 0.003 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Received-SPF: pass client-ip=205.139.110.120; envelope-from=dgilbert@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/17 02:30:14 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -50 X-Spam_score: -5.1 X-Spam_bar: ----- X-Spam_report: (-5.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-2.999, 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, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: berrange@redhat.com, zhang.zhanghailiang@huawei.com, quintela@redhat.com, liq3ea@gmail.com, qemu-devel@nongnu.org, xiexiangyou@huawei.com, alex.chen@huawei.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" * Zheng Chuan (zhengchuan@huawei.com) wrote: > > > On 2020/9/17 17:15, Dr. David Alan Gilbert wrote: > > * Chuan Zheng (zhengchuan@huawei.com) wrote: > >> v9 -> v10: > >> rename find_page_matched as find_block_matched > >> fix wrong termination condition in find_block_matched > >> add review-by for patches > >> > >> v8 -> v9: > >> fix wrong index return of record_ramblock_hash_info > >> optimize variable name according to review > >> reset dirty_rate as -1 > >> change returns of compare_page_hash_info to bool > >> > >> v7 -> v8: > >> add atomic_read for dirtyrate status > >> add error_report if set dirtyrate state failed > >> change returns of save_ramblock_hash and record_ramblock_hash_info to bool > >> alloc ramblock dirtyinfo array at one time > >> add review-by for patches > >> > >> v6 -> v7: > >> fix minior comments and coding style by review > >> add review-by for patches > >> > >> v5 -> v6: > >> fix coding style according to review > >> use TARGET_PAGE_SIZE and TARGET_PAGE_BITS instead of self-defined macros > >> return start-time and calc-time by qmp command > >> > >> v4 -> v5: > >> fix git apply failed due to meson-build > >> add review-by for patches in v3 > >> > >> v3 -> v4: > >> use crc32 to get hash result instead of md5 > >> add DirtyRateStatus to denote calculation status > >> add some trace_calls to make it easier to debug > >> fix some comments accroding to review > >> > >> v2 -> v3: > >> fix size_t compile warning > >> fix codestyle checked by checkpatch.pl > >> > >> v1 -> v2: > >> use g_rand_new() to generate rand_buf > >> move RAMBLOCK_FOREACH_MIGRATABLE into migration/ram.h > >> add skip_sample_ramblock to filter sampled ramblock > >> fix multi-numa vm coredump when query dirtyrate > >> rename qapi interface and rename some structures and functions > >> succeed to compile by appling each patch > >> add test for migrating vm > >> > >> Sometimes it is neccessary to evaluate dirty page rate before migration. > >> Users could decide whether to proceed migration based on the evaluation > >> in case of vm performance loss due to heavy workload. > >> Unlikey simulating dirtylog sync which could do harm on runnning vm, > >> we provide a sample-hash method to compare hash results for samping page. > >> In this way, it would have hardly no impact on vm performance. > >> > >> Evaluate the dirtypage rate both on running and migration vm. > >> The VM specifications for migration are as follows: > >> - VM use 4-K page; > >> - the number of VCPU is 32; > >> - the total memory is 32Gigabit; > >> - use 'mempress' tool to pressurize VM(mempress 4096 1024); > >> - migration bandwidth is 1GB/s > >> > >> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > >> | | running | migrating | > >> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > >> | no mempress | 4MB/s | 8MB/s (migrated success) | > >> ------------------------------------------------------------------------------------------- > >> | mempress 4096 1024 | 1060MB/s | 456MB/s ~ 1142MB/s (cpu throttle triggered) | > >> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > >> | mempress 4096 4096 | 4114MB/s | 688MB/s ~ 4132MB/s (cpu throttle triggered) | > >> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > >> > >> Test dirtyrate by qmp command like this: > >> 1. virsh qemu-monitor-command [vmname] '{"execute":"calc-dirty-rate", "arguments": {"calc-time": [sleep-time]}}'; > >> 2. sleep specific time which is a bit larger than sleep-time > >> 3. virsh qemu-monitor-command [vmname] '{"execute":"query-dirty-rate"}' > > > > Thanks; it looks like we have a full set of reviews; I'll try and add > > this for the next migration pull. > > > >> The qmp command returns like this: > >> {"return":{"status":"measured","dirty-rate":374,"start-time":3718293,"calc-time":1},"id":"libvirt-15"} > >> > >> Further test dirtyrate by libvirt api like this: > >> virsh getdirtyrate [vmname] [sleep-time] > > > > So do you have some libvirt patches you're going to post? > > > > Dave > > > > Hi, Dave. > > Yes, libvirt(including libvirt-python) interface will come after this qemu series patch:) OK, great; please cc in jdenemar@redhat.com when you do. Dave > >> Chuan Zheng (12): > >> migration/dirtyrate: setup up query-dirtyrate framwork > >> migration/dirtyrate: add DirtyRateStatus to denote calculation status > >> migration/dirtyrate: Add RamblockDirtyInfo to store sampled page info > >> migration/dirtyrate: Add dirtyrate statistics series functions > >> migration/dirtyrate: move RAMBLOCK_FOREACH_MIGRATABLE into ram.h > >> migration/dirtyrate: Record hash results for each sampled page > >> migration/dirtyrate: Compare page hash results for recorded sampled > >> page > >> migration/dirtyrate: skip sampling ramblock with size below > >> MIN_RAMBLOCK_SIZE > >> migration/dirtyrate: Implement set_sample_page_period() and > >> is_sample_period_valid() > >> migration/dirtyrate: Implement calculate_dirtyrate() function > >> migration/dirtyrate: Implement > >> qmp_cal_dirty_rate()/qmp_get_dirty_rate() function > >> migration/dirtyrate: Add trace_calls to make it easier to debug > >> > >> migration/dirtyrate.c | 426 +++++++++++++++++++++++++++++++++++++++++++++++++ > >> migration/dirtyrate.h | 70 ++++++++ > >> migration/meson.build | 2 +- > >> migration/ram.c | 11 +- > >> migration/ram.h | 10 ++ > >> migration/trace-events | 8 + > >> qapi/migration.json | 67 ++++++++ > >> 7 files changed, 583 insertions(+), 11 deletions(-) > >> create mode 100644 migration/dirtyrate.c > >> create mode 100644 migration/dirtyrate.h > >> > >> -- > >> 1.8.3.1 > >> > -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK