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From: Jianjun Duan <duanj@linux.vnet.ibm.com>
To: Halil Pasic <pasic@linux.vnet.ibm.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	"Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: veroniabahaa@gmail.com, peter.maydell@linaro.org,
	quintela@redhat.com, mst@redhat.com,
	mark.cave-ayland@ilande.co.uk, mdroth@linux.vnet.ibm.com,
	qemu-devel@nongnu.org, blauwirbel@gmail.com, dmitry@daynix.com,
	qemu-ppc@nongnu.org, kraxel@redhat.com,
	david@gibson.dropbear.id.au, amit.shah@redhat.com,
	kwolf@redhat.com, mreitz@redhat.com, leon.alrae@imgtec.com,
	aurelien@aurel32.net, rth@twiddle.net
Subject: Re: [Qemu-devel] [Qemu-ppc] [QEMU PATCH v5 4/6] migration: migrate QTAILQ
Date: Mon, 10 Oct 2016 14:40:03 -0700	[thread overview]
Message-ID: <b11007f1-b4be-5d12-f551-219f6d664390@linux.vnet.ibm.com> (raw)
In-Reply-To: <02caeaca-5a35-4efa-39be-772d1a314d74@linux.vnet.ibm.com>



On 10/08/2016 12:28 PM, Halil Pasic wrote:
> 
> 
> On 10/08/2016 01:37 PM, Paolo Bonzini wrote:
>>> Even though most put/get have no issues now, when somebody writes a new
>>>> put, he or she could run into issues if only checking the type
>>>> signature. It makes the code more readable.
> 
>> No, it doesn't because one is left wondering what is VMS_LINKED about.
> 
> I agree with Paolo. IMHO VMS_LINKED is conceptually difficult in  a sense
> that it's quite different that what we have currently. I have the feeling,
> conceptually, we are trying to fit in something like data structures with a
> type parameter (the element type) here. AFAIU what vmstate currently can is
> directed acyclic graphs of certain stuff (and also completely custom
> handling based on custom put/get).
> 
You are right. What we have in vmstate now cannot handle a recursive or
cyclic structure in a generic way. VMS_LINKED is intended to indicate a
recursive structure, with the newly added parameters of put/get
providing information about the element type in the recursive structure.

Thanks,
Jianjun
>> What is the relation between linked datastructures and passing some
>> arguments as NULL/noon-NULL?
> 
> IFAIU we need those for the datastructure because it's linked and has
> a type parameter (element type). The two last arguments are for
> the element type. These were added by the previous patch because
> the old VMStateInfo did not need these. So we drastically changed
> the scope of VMStateInfo with the previous patch and I'm not
> sure I like this.
> 
> I will have to stare at this a bit longer to bring something more
> constructive than these (largely feeling-based) remarks.
> 
> Cheers,
> Halil
> 

  parent reply	other threads:[~2016-10-10 21:40 UTC|newest]

Thread overview: 66+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-10-03 18:24 [Qemu-devel] [QEMU PATCH v5 0/6] migration: ensure hotplug and migration work together Jianjun Duan
2016-10-03 18:24 ` [Qemu-devel] [QEMU PATCH v5 1/6] migration: alternative way to set instance_id in SaveStateEntry Jianjun Duan
2016-10-05 10:12   ` Dr. David Alan Gilbert
2016-10-05 16:44     ` Jianjun Duan
2016-10-07  2:54       ` David Gibson
2016-10-07  8:07         ` Dr. David Alan Gilbert
2016-10-10  5:31           ` David Gibson
2016-10-11 16:17             ` Michael Roth
2016-10-11 23:37               ` David Gibson
2016-11-15 23:45         ` Michael Roth
2016-10-05 16:46     ` [Qemu-devel] [Qemu-ppc] " Jianjun Duan
2016-10-03 18:24 ` [Qemu-devel] [QEMU PATCH v5 2/6] migration: spapr_drc: defined VMStateDescription struct Jianjun Duan
2016-10-05 11:38   ` Dr. David Alan Gilbert
2016-10-07  3:17     ` David Gibson
2016-10-07  3:12   ` David Gibson
2016-10-07 17:17     ` Jianjun Duan
2016-10-10  5:09       ` David Gibson
2016-10-10 16:48         ` [Qemu-devel] [Qemu-ppc] " Jianjun Duan
2016-10-03 18:24 ` [Qemu-devel] [QEMU PATCH v5 3/6] migration: extend VMStateInfo Jianjun Duan
2016-10-07 12:08   ` Dr. David Alan Gilbert
2016-10-07 16:35     ` [Qemu-devel] [Qemu-ppc] " Jianjun Duan
2016-10-07 18:42       ` Dr. David Alan Gilbert
2016-10-10  5:02         ` David Gibson
2016-10-12 11:59   ` [Qemu-devel] " Halil Pasic
2016-10-12 12:07     ` Paolo Bonzini
2016-10-12 12:30       ` Halil Pasic
2016-10-12 14:59         ` Dr. David Alan Gilbert
2016-10-13 10:33           ` Halil Pasic
2016-10-13 11:12             ` Dr. David Alan Gilbert
2016-10-12 17:27       ` [Qemu-devel] [Qemu-ppc] " Jianjun Duan
2016-10-13  8:22         ` Paolo Bonzini
2016-10-13 10:48           ` Halil Pasic
2016-10-13 11:20             ` Paolo Bonzini
2016-10-13 16:23             ` Jianjun Duan
2016-10-13 16:32               ` Halil Pasic
2016-10-13 16:35                 ` Jianjun Duan
2016-10-03 18:24 ` [Qemu-devel] [QEMU PATCH v5 4/6] migration: migrate QTAILQ Jianjun Duan
2016-10-05 16:56   ` Dr. David Alan Gilbert
2016-10-05 17:19     ` Jianjun Duan
2016-10-06 19:01       ` Dr. David Alan Gilbert
2016-10-06 19:49         ` Jianjun Duan
2016-10-07  3:25         ` David Gibson
2016-10-07 14:31         ` Paolo Bonzini
2016-10-07 14:34           ` Dr. David Alan Gilbert
2016-10-07 16:31             ` [Qemu-devel] [Qemu-ppc] " Jianjun Duan
2016-10-07 16:32               ` Paolo Bonzini
2016-10-07 17:25                 ` Jianjun Duan
2016-10-07 17:34                   ` Dr. David Alan Gilbert
2016-10-07 17:43                     ` Jianjun Duan
2016-10-08 11:37                       ` Paolo Bonzini
2016-10-08 19:28                         ` Halil Pasic
2016-10-10 21:29                           ` Jianjun Duan
2016-10-11  7:33                             ` Paolo Bonzini
2016-10-10 21:40                           ` Jianjun Duan [this message]
2016-10-06 11:05     ` [Qemu-devel] " Paolo Bonzini
2016-10-06 11:56       ` Dr. David Alan Gilbert
2016-10-06 12:23         ` Paolo Bonzini
2016-10-06 15:21           ` Dr. David Alan Gilbert
2016-10-03 18:24 ` [Qemu-devel] [QEMU PATCH v5 5/6] migration: spapr: migrate ccs_list in spapr state Jianjun Duan
2016-10-07  3:36   ` David Gibson
2016-10-07 14:52     ` Michael Roth
2016-10-10  5:05       ` David Gibson
2016-10-03 18:24 ` [Qemu-devel] [QEMU PATCH v5 6/6] migration: spapr: migrate pending_events of " Jianjun Duan
2016-10-03 18:35 ` [Qemu-devel] [QEMU PATCH v5 0/6] migration: ensure hotplug and migration work together no-reply
2016-10-03 19:00 ` no-reply
2016-10-03 19:11 ` Jianjun Duan

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