From mboxrd@z Thu Jan 1 00:00:00 1970 From: thfbjyddx Subject: Re: =?iso-2022-jp?b?GyRCMnMbKEI/PzogW1BBVENIIDAwLzIxXVtS?= =?iso-2022-jp?b?RkNdIHBvc3Rjb3B5IGxpdmU/bWlncmF0aW9u?= Date: Thu, 12 Jan 2012 21:26:03 +0800 Message-ID: References: <20120111024508.GV6819@valinux.co.jp> , <20120112085441.GA23322@valinux.co.jp> Reply-To: thfbjyddx Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_001_NextPart436702167583_=----" Cc: "t.hirofuchi" , qemu-devel , kvm , "satoshi.itoh" To: "Isaku Yamahata" Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+gceq-qemu-devel=gmane.org@nongnu.org Sender: qemu-devel-bounces+gceq-qemu-devel=gmane.org@nongnu.org List-Id: kvm.vger.kernel.org ------=_001_NextPart436702167583_=---- Content-Type: text/plain; charset="iso-2022-jp" Content-Transfer-Encoding: base64 DQpEbyB5b3Uga25vdyB3aGF0IHdjaGFuIHRoZSBwcm9jZXNzIHdhcyBibG9ja2VkIGF0Pw0Ka3Zt 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Do you know what wchan the process = ;was blocked at?
kvm_vcpu_ioctl(env, KVM_SET_MSRS, &msr_data) doesn= 't seem to block.
 
It's
WCHAN          &nbs= p;  =20 COMMAND
umem_fault------qemu-system-x86
 
 
Tommy
 
Date: 2012-01-12 16:54
CC: t.hirofuchi= ; qemu-devel; kvm; satoshi.itoh
Subject: Re: [Qemu-devel]=1B$B2s=1B(B??: [PATCH 00/21][RF= C] postcopy=20 live?migration
On Thu, Jan 12, 2012 at 04:29:44PM = ;+0800, thfbjyddx wrote:
> Hi , I've dug more thess days=
>  
> > (qemu) migration-tcp: Attempting t= o start an incoming migration
> > migration-tcp: accepted migration
> > 4872:4872 postcopy_incoming_ram_load:1018:&n= bsp;incoming ram load
> > 4872:4872 postcopy_incoming_ram_load:1031:&n= bsp;addr 0x10870000 flags 0x4
> > 4872:4872 postcopy_incoming_ram_load:1057:&n= bsp;done
> > 4872:4872 postcopy_incoming_ram_load:1018:&n= bsp;incoming ram load
> > 4872:4872 postcopy_incoming_ram_load:1031:&n= bsp;addr 0x0 flags 0x10
> > 4872:4872 postcopy_incoming_ram_load:1037:&n= bsp;EOS
> > 4872:4872 postcopy_incoming_ram_load:1018:&n= bsp;incoming ram load
> > 4872:4872 postcopy_incoming_ram_load:1031:&n= bsp;addr 0x0 flags 0x10
> > 4872:4872 postcopy_incoming_ram_load:1037:&n= bsp;EOS
>  
> There should be only single EOS&nb= sp;line. Just copy & past miss?
>  
> There must be two EOS for one=  is coming from postcopy_outgoing_ram_save_live
> (...stage =3D=3D QEMU_SAVE_LIVE_STAGE_PART) = and the other is
> postcopy_outgoing_ram_save_live(...stage =3D=3D Q= EMU_SAVE_LIVE_STAGE_END)
> I think in postcopy the ram_save_l= ive in the iterate part can be ignore
> so why there still have the q= emu_put_byte(f, QEMU_VM_SECTON_PART) and
> qemu_put_byte(f, QEMU_VM_SECTON_END) in the&= nbsp;procedure? Is it essential?
 
Not so essential.
 
> Can you please track it down = one more step?
> Which line did it stuck in kv= m_put_msrs()? kvm_put_msrs() doesn't seem to
> block.(backtrace by the debugger would&= nbsp;be best.)
>
> it gets to the kvm_vcpu_ioctl(env, = ;KVM_SET_MSRS, &msr_data) and never return
> so it gets stuck
 
Do you know what wchan the process = ;was blocked at?
kvm_vcpu_ioctl(env, KVM_SET_MSRS, &msr_data) doesn= 't seem to block.
 
 
> when I check the EOS problem
> I just annotated the qemu_put_byte(f,&n= bsp;QEMU_VM_SECTION_PART); and qemu_put_be32
> (f, se->section_id)
>  (I think this is a wrong&nbs= p;way to fix it and I don't know h= ow it get through)
> and leave just the se->save_live_sta= te in the qemu_savevm_state_iterate
> it didn't get stuck at kvm_put_msr= s()
> but it has some other error
> (qemu) migration-tcp: Attempting to sta= rt an incoming migration
> migration-tcp: accepted migration
> 2126:2126 postcopy_incoming_ram_load:1018: incomi= ng ram load
> 2126:2126 postcopy_incoming_ram_load:1031: addr&n= bsp;0x10870000 flags 0x4
> 2126:2126 postcopy_incoming_ram_load:1057: done
> migration: successfully loaded vm state=
> 2126:2126 postcopy_incoming_fork_umemd:1069: fork=
> 2126:2126 postcopy_incoming_fork_umemd:1127: qemu=  pid: 2126 daemon pid: 2129
> 2130:2130 postcopy_incoming_umemd:1840: daemon&nb= sp;pid: 2130
> 2130:2130 postcopy_incoming_umemd:1875: entering&= nbsp;umemd main loop
> Can't find block !
> 2130:2130 postcopy_incoming_umem_ram_load:1526: s= hmem =3D=3D NULL
> 2130:2130 postcopy_incoming_umemd:1882: exiting&n= bsp;umemd main loop
> and at the same time , the&nb= sp;destination node didn't show the EOS
>  
> so I still can't solve the st= uck problem
> Thanks for your help~!
> =1B$B(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,= (,(,(,(,(,(,(,(,(,(,(,(,=1B(B
> Tommy
>  
> From: Isaku Yamahata
> Date: 2012-01-11 10:45
> To: thfbjyddx
> CC: t.hirofuchi; qemu-devel; kvm; satos= hi.itoh
> Subject: Re: [Qemu-devel]=1B$B2s=1B(B??: [PA= TCH 00/21][RFC] postcopy live migration
> On Sat, Jan 07, 2012 at 06:29= :14PM +0800, thfbjyddx wrote:
> > Hello all!
>  
> Hi, thank you for detailed report.=  The procedure you've tried looks
> good basically. Some comments below.
>  
> > I got the qemu basic ver= sion(03ecd2c80a64d030a22fe67cc7a60f24e17ff211) and
> > patched it correctly
> > but it still didn't make = ;sense and I got the same scenario as&n= bsp;before
> > outgoing node intel x86_64; i= ncoming node amd x86_64. guest image is = ;on nfs
> >  
> > I think I should show wh= at I do more clearly and hope somebody&= nbsp;can figure out
> > the problem
> > 
> >  =1B$B!&=1B(B 1, both in/out&= nbsp;node patch the qemu and start on 3= .1.7 kernel with umem
> > 
> >        ./confi= gure --target-list=3D
> x86_64-softmmu --enable-kvm --enable-postcopy
> > --enable-debug
> >        make
> >        make&nb= sp;install
> > 
> >  =1B$B!&=1B(B 2, outgoing qem= u:
> > 
> > qemu-system-x86_64 -m 256 -hda&nbs= p;xxx -monitor stdio -vnc: 2 -usbdevice tabl= et
> > -machine accel=3Dkvm
> > incoming qemu:
> > qemu-system-x86_64 -m 256 -hda&nbs= p;xxx -postcopy -incoming tcp:0:8888 -monitor
> > stdio -vnc: 2 -usbdevice tabl= et -machine accel=3Dkvm
> > 
> >  =1B$B!&=1B(B 3, outgoing nod= e:
> > 
> > migrate -d -p -n tcp:(incomin= g node ip):8888
> >  
> > result:
> > 
> >  =1B$B!&=1B(B outgoing qemu:
> > 
> > info status: VM-status: paused&nbs= p;(finish-migrate);
> > 
> >  =1B$B!&=1B(B incoming qemu:
> > 
> > can't type any more and = can't kill the process(qemu-system-x86)
> >  
> > I open the debug flag in=  migration.c migration-tcp.c migration-postcopy.c:
> > 
> >  =1B$B!&=1B(B outgoing qemu:
> > 
> > (qemu) migration-tcp: connect comp= leted
> > migration: beginning savevm
> > 4500:4500 postcopy_outgoing_ram_save_live:54= 0: stage 1
> > migration: iterate
> > 4500:4500 postcopy_outgoing_ram_save_live:54= 0: stage 2
> > migration: done iterating
> > 4500:4500 postcopy_outgoing_ram_save_live:54= 0: stage 3
> > 4500:4500 postcopy_outgoing_begin:716: = outgoing begin
> > 
> >  =1B$B!&=1B(B incoming qemu:
> > 
> > (qemu) migration-tcp: Attempting t= o start an incoming migration
> > migration-tcp: accepted migration
> > 4872:4872 postcopy_incoming_ram_load:1018:&n= bsp;incoming ram load
> > 4872:4872 postcopy_incoming_ram_load:1031:&n= bsp;addr 0x10870000 flags 0x4
> > 4872:4872 postcopy_incoming_ram_load:1057:&n= bsp;done
> > 4872:4872 postcopy_incoming_ram_load:1018:&n= bsp;incoming ram load
> > 4872:4872 postcopy_incoming_ram_load:1031:&n= bsp;addr 0x0 flags 0x10
> > 4872:4872 postcopy_incoming_ram_load:1037:&n= bsp;EOS
> > 4872:4872 postcopy_incoming_ram_load:1018:&n= bsp;incoming ram load
> > 4872:4872 postcopy_incoming_ram_load:1031:&n= bsp;addr 0x0 flags 0x10
> > 4872:4872 postcopy_incoming_ram_load:1037:&n= bsp;EOS
>  
> There should be only single EOS&nb= sp;line. Just copy & past miss?
>  
>  
> > from the result:
> > It didn't get to the "su= ccessfully loaded vm state"
> > So it still in the qemu_= loadvm_state, and I found it's in
> > cpu_synchronize_all_post_init->kvm_arch_put_re= gisters->kvm_put_msrs and got
> > stuck
>  
> Can you please track it down = one more step?
> Which line did it stuck in kv= m_put_msrs()? kvm_put_msrs() doesn't seem to
> block.(backtrace by the debugger would&= nbsp;be best.)
>  
> If possible, can you please test&n= bsp;with more simplified configuration.
> i.e. drop device as much as p= ossible i.e. no usbdevice, no disk...
> So the debug will be simplified.
>  
> thanks,
>  
> > Does anyone give some advises=  on the problem?
> > Thanks very much~
> >  
> > =1B$B(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,= (,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,=1B(B
> =1B$B(,=1B(B
> > Tommy
> >  
> > From: Isaku Yamahata
> > Date: 2011-12-29 09:25
> > To: kvm; qemu-devel
> > CC: yamahata; t.hirofuchi; satoshi= .itoh
> > Subject: [Qemu-devel] [PATCH 00/21= ][RFC] postcopy live migration
> > Intro
> > =3D=3D=3D=3D=3D
> > This patch series implements = postcopy live migration.[1]
> > As discussed at KVM forum&nbs= p;2011, dedicated character device is used f= or
> > distributed shared memory between&= nbsp;migration source and destination.
> > Now we can discuss/benchmark/compa= re with precopy. I believe there are
> > much rooms for improvement.
> >  
> > [1] http://wiki.qemu.org/Features/PostCopyLi= veMigration
> >  
> >  
> > Usage
> > =3D=3D=3D=3D=3D
> > You need load umem character&= nbsp;device on the host before starting migr= ation.
> > Postcopy can be used for = ;tcg and kvm accelarator. The implementation = ;depend
> > on only linux umem character&= nbsp;device. But the driver dependent code i= s split
> > into a file.
> > I tested only host page = size =3D=3D guest page size case, but t= he implementation
> > allows host page size !=3D&nb= sp;guest page size case.
> >  
> > The following options are add= ed with this patch series.
> > - incoming part
> >   command line options
> >   -postcopy [-postcopy-flags = <flags>]
> >   where flags is for&nbs= p;changing behavior for benchmark/debugging
> >   Currently the following&nbs= p;flags are available
> >   0: default
> >   1: enable touching pag= e request
> >  
> >   example:
> >   qemu -postcopy -incoming&nb= sp;tcp:0:4444 -monitor stdio -machine accel=3Dkvm
> >  
> > - outging part
> >   options for migrate co= mmand 
> >   migrate [-p [-n]] URI<= /DIV>
> >   -p: indicate postcopy = migration
> >   -n: disable background = ;transferring pages: This is for benchmark/debugg= ing
> >  
> >   example:
> >   migrate -p -n tcp:<= dest ip address>:4444
> >  
> >  
> > TODO
> > =3D=3D=3D=3D
> > - benchmark/evaluation. Especially = ;how async page fault affects the result.
> > - improve/optimization
> >   At the moment at = least what I'm aware of is
> >   - touching pages in&nb= sp;incoming qemu process by fd handler seems=  suboptimal.
> >     creating dedicated&n= bsp;thread?
> >   - making incoming sock= et non-blocking
> >   - outgoing handler see= ms suboptimal causing latency.
> > - catch up memory API ch= ange
> > - consider on FUSE/CUSE possi= bility
> > - and more...
> >  
> > basic postcopy work flow
> > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D
> >         q= emu on the destination
> >         &= nbsp;     |
> >         &= nbsp;     V
> >         o= pen(/dev/umem)
> >         &= nbsp;     |
> >         &= nbsp;     V
> >         U= MEM_DEV_CREATE_UMEM
> >         &= nbsp;     |
> >         &= nbsp;     V
> >         H= ere we have two file descriptors to
> >         u= mem device and shmem file
> >         &= nbsp;     |
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =    umemd
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =    daemon on the destination
> >         &= nbsp;     |
> >         &= nbsp;     V    create pi= pe to communicate
> >         f= ork()---------------------------------------,
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     V      &n= bsp;           &nbs= p;            =        |
> >         c= lose(socket)          &n= bsp;           &nbs= p;         V
> >         c= lose(shmem)          &nb= sp;            = ;       mmap(shmem file)
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     V      &n= bsp;           &nbs= p;            =        V
> >         m= map(umem device) for guest RAM    =        close(shmem file)
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         c= lose(umem device)        &nbs= p;            =       |
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     V      &n= bsp;           &nbs= p;            =        |
> >         w= ait for ready from daemon <----pipe-----send&n= bsp;ready message
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =   Here the daemon takes over 
> >         s= end ok------------pipe---------------> the owner of=  the socket    
> >         &= nbsp;     |      &n= bsp;  to the source      = ;        
> >         &= nbsp;     V      &n= bsp;           &nbs= p;            =        |
> >         e= ntering post copy stage      =             &n= bsp;  |
> >         s= tart guest execution       &n= bsp;           &nbs= p;    |
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     V      &n= bsp;           &nbs= p;            =        V
> >         a= ccess guest RAM        &= nbsp;           &nb= sp;     UMEM_GET_PAGE_REQUEST
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     V      &n= bsp;           &nbs= p;            =        V
> >         p= age fault ------------------------------>page offset&nbs= p;is returned
> >         b= lock           &nbs= p;            =             &n= bsp;   |
> >         &= nbsp;           &nb= sp;            = ;            &= nbsp;       V
> >         &= nbsp;           &nb= sp;            = ;            &= nbsp;    pull page from the source=
> >         &= nbsp;           &nb= sp;            = ;            &= nbsp;    write the page contents
> >         &= nbsp;           &nb= sp;            = ;            &= nbsp;    to the shmem.
> >         &= nbsp;           &nb= sp;            = ;            &= nbsp;       |
> >         &= nbsp;           &nb= sp;            = ;            &= nbsp;       V
> >         u= nblock     <-----------------------------UMEM_= MARK_PAGE_CACHED
> >         t= he fault handler returns the page
> >         p= age fault is resolved
> >         &= nbsp;     |
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =     pages can be sent
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =     backgroundly
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        V
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =     UMEM_MARK_PAGE_CACHED
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     V      &n= bsp;           &nbs= p;            =        V
> >         T= he specified pages<-----pipe------------request to = touch pages
> >         a= re made present by       = ;            &= nbsp;      |
> >         t= ouching guest RAM.       &nbs= p;            =       |
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     V      &n= bsp;           &nbs= p;            =        V
> >         &= nbsp;    reply-------------pipe-------------> = release the cached page
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =     madvise(MADV_REMOVE)
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     V      &n= bsp;           &nbs= p;            =        V
> >  
> >         &= nbsp;        all the pag= es are pulled from the source
> >  
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     V      &n= bsp;           &nbs= p;            =        V
> >         t= he vma becomes anonymous<----------------UMEM_MAKE_VMA_A= NONYMOUS
> >        (note:&= nbsp;I'm not sure if this can be implem= ented or not)
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     V      &n= bsp;           &nbs= p;            =        V
> >         m= igration completes        &nb= sp;            = ;   exit()
> >  
> >  
> >  
> > Isaku Yamahata (21):
> >   arch_init: export sort_ram_= list() and ram_save_block()
> >   arch_init: export RAM_SAVE_= xxx flags for postcopy
> >   arch_init/ram_save: introduce&nb= sp;constant for ram save version =3D 4
> >   arch_init: refactor host_fr= om_stream_offset()
> >   arch_init/ram_save_live: factor&= nbsp;out RAM_SAVE_FLAG_MEM_SIZE case
> >   arch_init: refactor ram_sav= e_block()
> >   arch_init/ram_save_live: factor&= nbsp;out ram_save_limit
> >   arch_init/ram_load: refactor&nbs= p;ram_load
> >   exec.c: factor out qem= u_get_ram_ptr()
> >   exec.c: export last_ram_off= set()
> >   savevm: export qemu_peek_bu= ffer, qemu_peek_byte, qemu_file_skip
> >   savevm: qemu_pending_size() = ;to return pending buffered size
> >   savevm, buffered_file: intr= oduce method to drain buffer of buffered
> >     file
> >   migration: export migrate_f= d_completed() and migrate_fd_cleanup()
> >   migration: factor out = parameters into MigrationParams
> >   umem.h: import Linux u= mem.h
> >   update-linux-headers.sh: teach&n= bsp;umem.h to update-linux-headers.sh
> >   configure: add CONFIG_POSTC= OPY option
> >   postcopy: introduce -postco= py and -postcopy-flags option
> >   postcopy outgoing: add = ;-p and -n option to migrate command
> >   postcopy: implement postcop= y livemigration
> >  
> >  Makefile.target    &nbs= p;            = |    4 +
> >  arch_init.c     &n= bsp;           &nbs= p;   |  260 ++++---
> >  arch_init.h     &n= bsp;           &nbs= p;   |   20 +
> >  block-migration.c    &n= bsp;          | &nb= sp;  8 +-
> >  buffered_file.c    &nbs= p;            = |   20 +-
> >  buffered_file.h    &nbs= p;            = |    1 +
> >  configure     &nbs= p;            =      |   12 +
> >  cpu-all.h     &nbs= p;            =      |    9 +
> >  exec-obsolete.h    &nbs= p;            = |    1 +
> >  exec.c      &= nbsp;           &nb= sp;       |   75 +-=
> >  hmp-commands.hx    &nbs= p;            = |   12 +-
> >  hw/hw.h      =             &n= bsp;      |    7 +-=
> >  linux-headers/linux/umem.h   = ;   |   83 ++
> >  migration-exec.c    &nb= sp;           |&nbs= p;   8 +
> >  migration-fd.c     = ;            &= nbsp;|   30 +
> >  migration-postcopy-stub.c   =     |   77 ++
> >  migration-postcopy.c    = ;        |
>  1891 +++++++++++++++++++++++++++++++++++++++
> >  migration-tcp.c    &nbs= p;            = |   37 +-
> >  migration-unix.c    &nb= sp;           |&nbs= p;  32 +-
> >  migration.c     &n= bsp;           &nbs= p;   |   53 +-
> >  migration.h     &n= bsp;           &nbs= p;   |   49 +-
> >  qemu-common.h     =             &n= bsp; |    2 +
> >  qemu-options.hx    &nbs= p;            = |   25 +
> >  qmp-commands.hx    &nbs= p;            = |   10 +-
> >  savevm.c      = ;            &= nbsp;     |   31 +-
> >  scripts/update-linux-headers.sh | = ;   2 +-
> >  sysemu.h      = ;            &= nbsp;     |    4 +-
> >  umem.c      &= nbsp;           &nb= sp;       |  379 +++++++= +
> >  umem.h      &= nbsp;           &nb= sp;       |  105 +++
> >  vl.c      &nb= sp;            = ;         |   = 20 +-
> >  30 files changed, 3086 = insertions(+), 181 deletions(-)
> >  create mode 100644 linux-hea= ders/linux/umem.h
> >  create mode 100644 migration= -postcopy-stub.c
> >  create mode 100644 migration= -postcopy.c
> >  create mode 100644 umem.c
> >  create mode 100644 umem.h
> >  
> >  
> >  
>  
> -- 
> yamahata
>  
>  
 
-- 
yamahata
 
 
------=_001_NextPart436702167583_=------ From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:53052) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RlKfY-0001Fb-HG for qemu-devel@nongnu.org; Thu, 12 Jan 2012 08:26:23 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RlKfR-00009J-0A for qemu-devel@nongnu.org; Thu, 12 Jan 2012 08:26:16 -0500 Received: from blu0-omc3-s27.blu0.hotmail.com ([65.55.116.102]:25110) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RlKfQ-00009B-Ng for qemu-devel@nongnu.org; Thu, 12 Jan 2012 08:26:08 -0500 Message-ID: Date: Thu, 12 Jan 2012 21:26:03 +0800 From: thfbjyddx References: <20120111024508.GV6819@valinux.co.jp> , <20120112085441.GA23322@valinux.co.jp> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_001_NextPart436702167583_=----" Subject: Re: [Qemu-devel] =?iso-2022-jp?b?GyRCMnMbKEI/PzogW1BBVENIIDAwLzIxXVtS?= =?iso-2022-jp?b?RkNdIHBvc3Rjb3B5IGxpdmU/bWlncmF0aW9u?= Reply-To: thfbjyddx List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Isaku Yamahata Cc: "t.hirofuchi" , qemu-devel , kvm , "satoshi.itoh" ------=_001_NextPart436702167583_=---- Content-Type: text/plain; charset="iso-2022-jp" Content-Transfer-Encoding: base64 DQpEbyB5b3Uga25vdyB3aGF0IHdjaGFuIHRoZSBwcm9jZXNzIHdhcyBibG9ja2VkIGF0Pw0Ka3Zt X3ZjcHVfaW9jdGwoZW52LCBLVk1fU0VUX01TUlMsICZtc3JfZGF0YSkgZG9lc24ndCBzZWVtIHRv IGJsb2NrLg0KDQpJdCdzDQpXQ0hBTiAgICAgICAgICAgICAgQ09NTUFORA0KdW1lbV9mYXVsdC0t LS0tLXFlbXUtc3lzdGVtLXg4Ng0KDQoNCg0KDQoNClRvbW15DQoNCkZyb206IElzYWt1IFlhbWFo YXRhDQpEYXRlOiAyMDEyLTAxLTEyIDE2OjU0DQpUbzogdGhmYmp5ZGR4DQpDQzogdC5oaXJvZnVj aGk7IHFlbXUtZGV2ZWw7IGt2bTsgc2F0b3NoaS5pdG9oDQpTdWJqZWN0OiBSZTogW1FlbXUtZGV2 ZWxdGyRCMnMbKEI/PzogW1BBVENIIDAwLzIxXVtSRkNdIHBvc3Rjb3B5IGxpdmU/bWlncmF0aW9u DQpPbiBUaHUsIEphbiAxMiwgMjAxMiBhdCAwNDoyOTo0NFBNICswODAwLCB0aGZianlkZHggd3Jv 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Do you know what wchan the process = ;was blocked at?
kvm_vcpu_ioctl(env, KVM_SET_MSRS, &msr_data) doesn= 't seem to block.
 
It's
WCHAN          &nbs= p;  =20 COMMAND
umem_fault------qemu-system-x86
 
 
Tommy
 
Date: 2012-01-12 16:54
CC: t.hirofuchi= ; qemu-devel; kvm; satoshi.itoh
Subject: Re: [Qemu-devel]=1B$B2s=1B(B??: [PATCH 00/21][RF= C] postcopy=20 live?migration
On Thu, Jan 12, 2012 at 04:29:44PM = ;+0800, thfbjyddx wrote:
> Hi , I've dug more thess days=
>  
> > (qemu) migration-tcp: Attempting t= o start an incoming migration
> > migration-tcp: accepted migration
> > 4872:4872 postcopy_incoming_ram_load:1018:&n= bsp;incoming ram load
> > 4872:4872 postcopy_incoming_ram_load:1031:&n= bsp;addr 0x10870000 flags 0x4
> > 4872:4872 postcopy_incoming_ram_load:1057:&n= bsp;done
> > 4872:4872 postcopy_incoming_ram_load:1018:&n= bsp;incoming ram load
> > 4872:4872 postcopy_incoming_ram_load:1031:&n= bsp;addr 0x0 flags 0x10
> > 4872:4872 postcopy_incoming_ram_load:1037:&n= bsp;EOS
> > 4872:4872 postcopy_incoming_ram_load:1018:&n= bsp;incoming ram load
> > 4872:4872 postcopy_incoming_ram_load:1031:&n= bsp;addr 0x0 flags 0x10
> > 4872:4872 postcopy_incoming_ram_load:1037:&n= bsp;EOS
>  
> There should be only single EOS&nb= sp;line. Just copy & past miss?
>  
> There must be two EOS for one=  is coming from postcopy_outgoing_ram_save_live
> (...stage =3D=3D QEMU_SAVE_LIVE_STAGE_PART) = and the other is
> postcopy_outgoing_ram_save_live(...stage =3D=3D Q= EMU_SAVE_LIVE_STAGE_END)
> I think in postcopy the ram_save_l= ive in the iterate part can be ignore
> so why there still have the q= emu_put_byte(f, QEMU_VM_SECTON_PART) and
> qemu_put_byte(f, QEMU_VM_SECTON_END) in the&= nbsp;procedure? Is it essential?
 
Not so essential.
 
> Can you please track it down = one more step?
> Which line did it stuck in kv= m_put_msrs()? kvm_put_msrs() doesn't seem to
> block.(backtrace by the debugger would&= nbsp;be best.)
>
> it gets to the kvm_vcpu_ioctl(env, = ;KVM_SET_MSRS, &msr_data) and never return
> so it gets stuck
 
Do you know what wchan the process = ;was blocked at?
kvm_vcpu_ioctl(env, KVM_SET_MSRS, &msr_data) doesn= 't seem to block.
 
 
> when I check the EOS problem
> I just annotated the qemu_put_byte(f,&n= bsp;QEMU_VM_SECTION_PART); and qemu_put_be32
> (f, se->section_id)
>  (I think this is a wrong&nbs= p;way to fix it and I don't know h= ow it get through)
> and leave just the se->save_live_sta= te in the qemu_savevm_state_iterate
> it didn't get stuck at kvm_put_msr= s()
> but it has some other error
> (qemu) migration-tcp: Attempting to sta= rt an incoming migration
> migration-tcp: accepted migration
> 2126:2126 postcopy_incoming_ram_load:1018: incomi= ng ram load
> 2126:2126 postcopy_incoming_ram_load:1031: addr&n= bsp;0x10870000 flags 0x4
> 2126:2126 postcopy_incoming_ram_load:1057: done
> migration: successfully loaded vm state=
> 2126:2126 postcopy_incoming_fork_umemd:1069: fork=
> 2126:2126 postcopy_incoming_fork_umemd:1127: qemu=  pid: 2126 daemon pid: 2129
> 2130:2130 postcopy_incoming_umemd:1840: daemon&nb= sp;pid: 2130
> 2130:2130 postcopy_incoming_umemd:1875: entering&= nbsp;umemd main loop
> Can't find block !
> 2130:2130 postcopy_incoming_umem_ram_load:1526: s= hmem =3D=3D NULL
> 2130:2130 postcopy_incoming_umemd:1882: exiting&n= bsp;umemd main loop
> and at the same time , the&nb= sp;destination node didn't show the EOS
>  
> so I still can't solve the st= uck problem
> Thanks for your help~!
> =1B$B(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,= (,(,(,(,(,(,(,(,(,(,(,(,=1B(B
> Tommy
>  
> From: Isaku Yamahata
> Date: 2012-01-11 10:45
> To: thfbjyddx
> CC: t.hirofuchi; qemu-devel; kvm; satos= hi.itoh
> Subject: Re: [Qemu-devel]=1B$B2s=1B(B??: [PA= TCH 00/21][RFC] postcopy live migration
> On Sat, Jan 07, 2012 at 06:29= :14PM +0800, thfbjyddx wrote:
> > Hello all!
>  
> Hi, thank you for detailed report.=  The procedure you've tried looks
> good basically. Some comments below.
>  
> > I got the qemu basic ver= sion(03ecd2c80a64d030a22fe67cc7a60f24e17ff211) and
> > patched it correctly
> > but it still didn't make = ;sense and I got the same scenario as&n= bsp;before
> > outgoing node intel x86_64; i= ncoming node amd x86_64. guest image is = ;on nfs
> >  
> > I think I should show wh= at I do more clearly and hope somebody&= nbsp;can figure out
> > the problem
> > 
> >  =1B$B!&=1B(B 1, both in/out&= nbsp;node patch the qemu and start on 3= .1.7 kernel with umem
> > 
> >        ./confi= gure --target-list=3D
> x86_64-softmmu --enable-kvm --enable-postcopy
> > --enable-debug
> >        make
> >        make&nb= sp;install
> > 
> >  =1B$B!&=1B(B 2, outgoing qem= u:
> > 
> > qemu-system-x86_64 -m 256 -hda&nbs= p;xxx -monitor stdio -vnc: 2 -usbdevice tabl= et
> > -machine accel=3Dkvm
> > incoming qemu:
> > qemu-system-x86_64 -m 256 -hda&nbs= p;xxx -postcopy -incoming tcp:0:8888 -monitor
> > stdio -vnc: 2 -usbdevice tabl= et -machine accel=3Dkvm
> > 
> >  =1B$B!&=1B(B 3, outgoing nod= e:
> > 
> > migrate -d -p -n tcp:(incomin= g node ip):8888
> >  
> > result:
> > 
> >  =1B$B!&=1B(B outgoing qemu:
> > 
> > info status: VM-status: paused&nbs= p;(finish-migrate);
> > 
> >  =1B$B!&=1B(B incoming qemu:
> > 
> > can't type any more and = can't kill the process(qemu-system-x86)
> >  
> > I open the debug flag in=  migration.c migration-tcp.c migration-postcopy.c:
> > 
> >  =1B$B!&=1B(B outgoing qemu:
> > 
> > (qemu) migration-tcp: connect comp= leted
> > migration: beginning savevm
> > 4500:4500 postcopy_outgoing_ram_save_live:54= 0: stage 1
> > migration: iterate
> > 4500:4500 postcopy_outgoing_ram_save_live:54= 0: stage 2
> > migration: done iterating
> > 4500:4500 postcopy_outgoing_ram_save_live:54= 0: stage 3
> > 4500:4500 postcopy_outgoing_begin:716: = outgoing begin
> > 
> >  =1B$B!&=1B(B incoming qemu:
> > 
> > (qemu) migration-tcp: Attempting t= o start an incoming migration
> > migration-tcp: accepted migration
> > 4872:4872 postcopy_incoming_ram_load:1018:&n= bsp;incoming ram load
> > 4872:4872 postcopy_incoming_ram_load:1031:&n= bsp;addr 0x10870000 flags 0x4
> > 4872:4872 postcopy_incoming_ram_load:1057:&n= bsp;done
> > 4872:4872 postcopy_incoming_ram_load:1018:&n= bsp;incoming ram load
> > 4872:4872 postcopy_incoming_ram_load:1031:&n= bsp;addr 0x0 flags 0x10
> > 4872:4872 postcopy_incoming_ram_load:1037:&n= bsp;EOS
> > 4872:4872 postcopy_incoming_ram_load:1018:&n= bsp;incoming ram load
> > 4872:4872 postcopy_incoming_ram_load:1031:&n= bsp;addr 0x0 flags 0x10
> > 4872:4872 postcopy_incoming_ram_load:1037:&n= bsp;EOS
>  
> There should be only single EOS&nb= sp;line. Just copy & past miss?
>  
>  
> > from the result:
> > It didn't get to the "su= ccessfully loaded vm state"
> > So it still in the qemu_= loadvm_state, and I found it's in
> > cpu_synchronize_all_post_init->kvm_arch_put_re= gisters->kvm_put_msrs and got
> > stuck
>  
> Can you please track it down = one more step?
> Which line did it stuck in kv= m_put_msrs()? kvm_put_msrs() doesn't seem to
> block.(backtrace by the debugger would&= nbsp;be best.)
>  
> If possible, can you please test&n= bsp;with more simplified configuration.
> i.e. drop device as much as p= ossible i.e. no usbdevice, no disk...
> So the debug will be simplified.
>  
> thanks,
>  
> > Does anyone give some advises=  on the problem?
> > Thanks very much~
> >  
> > =1B$B(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,= (,(,(,(,(,(,(,(,(,(,(,(,(,(,(,(,=1B(B
> =1B$B(,=1B(B
> > Tommy
> >  
> > From: Isaku Yamahata
> > Date: 2011-12-29 09:25
> > To: kvm; qemu-devel
> > CC: yamahata; t.hirofuchi; satoshi= .itoh
> > Subject: [Qemu-devel] [PATCH 00/21= ][RFC] postcopy live migration
> > Intro
> > =3D=3D=3D=3D=3D
> > This patch series implements = postcopy live migration.[1]
> > As discussed at KVM forum&nbs= p;2011, dedicated character device is used f= or
> > distributed shared memory between&= nbsp;migration source and destination.
> > Now we can discuss/benchmark/compa= re with precopy. I believe there are
> > much rooms for improvement.
> >  
> > [1] http://wiki.qemu.org/Features/PostCopyLi= veMigration
> >  
> >  
> > Usage
> > =3D=3D=3D=3D=3D
> > You need load umem character&= nbsp;device on the host before starting migr= ation.
> > Postcopy can be used for = ;tcg and kvm accelarator. The implementation = ;depend
> > on only linux umem character&= nbsp;device. But the driver dependent code i= s split
> > into a file.
> > I tested only host page = size =3D=3D guest page size case, but t= he implementation
> > allows host page size !=3D&nb= sp;guest page size case.
> >  
> > The following options are add= ed with this patch series.
> > - incoming part
> >   command line options
> >   -postcopy [-postcopy-flags = <flags>]
> >   where flags is for&nbs= p;changing behavior for benchmark/debugging
> >   Currently the following&nbs= p;flags are available
> >   0: default
> >   1: enable touching pag= e request
> >  
> >   example:
> >   qemu -postcopy -incoming&nb= sp;tcp:0:4444 -monitor stdio -machine accel=3Dkvm
> >  
> > - outging part
> >   options for migrate co= mmand 
> >   migrate [-p [-n]] URI<= /DIV>
> >   -p: indicate postcopy = migration
> >   -n: disable background = ;transferring pages: This is for benchmark/debugg= ing
> >  
> >   example:
> >   migrate -p -n tcp:<= dest ip address>:4444
> >  
> >  
> > TODO
> > =3D=3D=3D=3D
> > - benchmark/evaluation. Especially = ;how async page fault affects the result.
> > - improve/optimization
> >   At the moment at = least what I'm aware of is
> >   - touching pages in&nb= sp;incoming qemu process by fd handler seems=  suboptimal.
> >     creating dedicated&n= bsp;thread?
> >   - making incoming sock= et non-blocking
> >   - outgoing handler see= ms suboptimal causing latency.
> > - catch up memory API ch= ange
> > - consider on FUSE/CUSE possi= bility
> > - and more...
> >  
> > basic postcopy work flow
> > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D
> >         q= emu on the destination
> >         &= nbsp;     |
> >         &= nbsp;     V
> >         o= pen(/dev/umem)
> >         &= nbsp;     |
> >         &= nbsp;     V
> >         U= MEM_DEV_CREATE_UMEM
> >         &= nbsp;     |
> >         &= nbsp;     V
> >         H= ere we have two file descriptors to
> >         u= mem device and shmem file
> >         &= nbsp;     |
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =    umemd
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =    daemon on the destination
> >         &= nbsp;     |
> >         &= nbsp;     V    create pi= pe to communicate
> >         f= ork()---------------------------------------,
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     V      &n= bsp;           &nbs= p;            =        |
> >         c= lose(socket)          &n= bsp;           &nbs= p;         V
> >         c= lose(shmem)          &nb= sp;            = ;       mmap(shmem file)
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     V      &n= bsp;           &nbs= p;            =        V
> >         m= map(umem device) for guest RAM    =        close(shmem file)
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         c= lose(umem device)        &nbs= p;            =       |
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     V      &n= bsp;           &nbs= p;            =        |
> >         w= ait for ready from daemon <----pipe-----send&n= bsp;ready message
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =   Here the daemon takes over 
> >         s= end ok------------pipe---------------> the owner of=  the socket    
> >         &= nbsp;     |      &n= bsp;  to the source      = ;        
> >         &= nbsp;     V      &n= bsp;           &nbs= p;            =        |
> >         e= ntering post copy stage      =             &n= bsp;  |
> >         s= tart guest execution       &n= bsp;           &nbs= p;    |
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     V      &n= bsp;           &nbs= p;            =        V
> >         a= ccess guest RAM        &= nbsp;           &nb= sp;     UMEM_GET_PAGE_REQUEST
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     V      &n= bsp;           &nbs= p;            =        V
> >         p= age fault ------------------------------>page offset&nbs= p;is returned
> >         b= lock           &nbs= p;            =             &n= bsp;   |
> >         &= nbsp;           &nb= sp;            = ;            &= nbsp;       V
> >         &= nbsp;           &nb= sp;            = ;            &= nbsp;    pull page from the source=
> >         &= nbsp;           &nb= sp;            = ;            &= nbsp;    write the page contents
> >         &= nbsp;           &nb= sp;            = ;            &= nbsp;    to the shmem.
> >         &= nbsp;           &nb= sp;            = ;            &= nbsp;       |
> >         &= nbsp;           &nb= sp;            = ;            &= nbsp;       V
> >         u= nblock     <-----------------------------UMEM_= MARK_PAGE_CACHED
> >         t= he fault handler returns the page
> >         p= age fault is resolved
> >         &= nbsp;     |
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =     pages can be sent
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =     backgroundly
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        V
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =     UMEM_MARK_PAGE_CACHED
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     V      &n= bsp;           &nbs= p;            =        V
> >         T= he specified pages<-----pipe------------request to = touch pages
> >         a= re made present by       = ;            &= nbsp;      |
> >         t= ouching guest RAM.       &nbs= p;            =       |
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     V      &n= bsp;           &nbs= p;            =        V
> >         &= nbsp;    reply-------------pipe-------------> = release the cached page
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =     madvise(MADV_REMOVE)
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     V      &n= bsp;           &nbs= p;            =        V
> >  
> >         &= nbsp;        all the pag= es are pulled from the source
> >  
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     V      &n= bsp;           &nbs= p;            =        V
> >         t= he vma becomes anonymous<----------------UMEM_MAKE_VMA_A= NONYMOUS
> >        (note:&= nbsp;I'm not sure if this can be implem= ented or not)
> >         &= nbsp;     |      &n= bsp;           &nbs= p;            =        |
> >         &= nbsp;     V      &n= bsp;           &nbs= p;            =        V
> >         m= igration completes        &nb= sp;            = ;   exit()
> >  
> >  
> >  
> > Isaku Yamahata (21):
> >   arch_init: export sort_ram_= list() and ram_save_block()
> >   arch_init: export RAM_SAVE_= xxx flags for postcopy
> >   arch_init/ram_save: introduce&nb= sp;constant for ram save version =3D 4
> >   arch_init: refactor host_fr= om_stream_offset()
> >   arch_init/ram_save_live: factor&= nbsp;out RAM_SAVE_FLAG_MEM_SIZE case
> >   arch_init: refactor ram_sav= e_block()
> >   arch_init/ram_save_live: factor&= nbsp;out ram_save_limit
> >   arch_init/ram_load: refactor&nbs= p;ram_load
> >   exec.c: factor out qem= u_get_ram_ptr()
> >   exec.c: export last_ram_off= set()
> >   savevm: export qemu_peek_bu= ffer, qemu_peek_byte, qemu_file_skip
> >   savevm: qemu_pending_size() = ;to return pending buffered size
> >   savevm, buffered_file: intr= oduce method to drain buffer of buffered
> >     file
> >   migration: export migrate_f= d_completed() and migrate_fd_cleanup()
> >   migration: factor out = parameters into MigrationParams
> >   umem.h: import Linux u= mem.h
> >   update-linux-headers.sh: teach&n= bsp;umem.h to update-linux-headers.sh
> >   configure: add CONFIG_POSTC= OPY option
> >   postcopy: introduce -postco= py and -postcopy-flags option
> >   postcopy outgoing: add = ;-p and -n option to migrate command
> >   postcopy: implement postcop= y livemigration
> >  
> >  Makefile.target    &nbs= p;            = |    4 +
> >  arch_init.c     &n= bsp;           &nbs= p;   |  260 ++++---
> >  arch_init.h     &n= bsp;           &nbs= p;   |   20 +
> >  block-migration.c    &n= bsp;          | &nb= sp;  8 +-
> >  buffered_file.c    &nbs= p;            = |   20 +-
> >  buffered_file.h    &nbs= p;            = |    1 +
> >  configure     &nbs= p;            =      |   12 +
> >  cpu-all.h     &nbs= p;            =      |    9 +
> >  exec-obsolete.h    &nbs= p;            = |    1 +
> >  exec.c      &= nbsp;           &nb= sp;       |   75 +-=
> >  hmp-commands.hx    &nbs= p;            = |   12 +-
> >  hw/hw.h      =             &n= bsp;      |    7 +-=
> >  linux-headers/linux/umem.h   = ;   |   83 ++
> >  migration-exec.c    &nb= sp;           |&nbs= p;   8 +
> >  migration-fd.c     = ;            &= nbsp;|   30 +
> >  migration-postcopy-stub.c   =     |   77 ++
> >  migration-postcopy.c    = ;        |
>  1891 +++++++++++++++++++++++++++++++++++++++
> >  migration-tcp.c    &nbs= p;            = |   37 +-
> >  migration-unix.c    &nb= sp;           |&nbs= p;  32 +-
> >  migration.c     &n= bsp;           &nbs= p;   |   53 +-
> >  migration.h     &n= bsp;           &nbs= p;   |   49 +-
> >  qemu-common.h     =             &n= bsp; |    2 +
> >  qemu-options.hx    &nbs= p;            = |   25 +
> >  qmp-commands.hx    &nbs= p;            = |   10 +-
> >  savevm.c      = ;            &= nbsp;     |   31 +-
> >  scripts/update-linux-headers.sh | = ;   2 +-
> >  sysemu.h      = ;            &= nbsp;     |    4 +-
> >  umem.c      &= nbsp;           &nb= sp;       |  379 +++++++= +
> >  umem.h      &= nbsp;           &nb= sp;       |  105 +++
> >  vl.c      &nb= sp;            = ;         |   = 20 +-
> >  30 files changed, 3086 = insertions(+), 181 deletions(-)
> >  create mode 100644 linux-hea= ders/linux/umem.h
> >  create mode 100644 migration= -postcopy-stub.c
> >  create mode 100644 migration= -postcopy.c
> >  create mode 100644 umem.c
> >  create mode 100644 umem.h
> >  
> >  
> >  
>  
> -- 
> yamahata
>  
>  
 
-- 
yamahata
 
 
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