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Re: [Qemu-devel] [PULL 42/57] Page request: Consume pages off the post-c
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [PULL 42/57] Page request: Consume pages off the post-copy queue |
Date: |
Thu, 12 Nov 2015 12:04:44 +0000 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
* Peter Maydell (address@hidden) wrote:
> On 10 November 2015 at 14:25, Juan Quintela <address@hidden> wrote:
> > From: "Dr. David Alan Gilbert" <address@hidden>
> >
> > When transmitting RAM pages, consume pages that have been queued by
> > MIG_RPCOMM_REQPAGE commands and send them ahead of normal page scanning.
> >
> > Note:
> > a) After a queued page the linear walk carries on from after the
> > unqueued page; there is a reasonable chance that the destination
> > was about to ask for other closeby pages anyway.
> >
> > b) We have to be careful of any assumptions that the page walking
> > code makes, in particular it does some short cuts on its first linear
> > walk that break as soon as we do a queued page.
> >
> > c) We have to be careful to not break up host-page size chunks, since
> > this makes it harder to place the pages on the destination.
> >
> > Signed-off-by: Dr. David Alan Gilbert <address@hidden>
> > Reviewed-by: Juan Quintela <address@hidden>
> > Signed-off-by: Juan Quintela <address@hidden>
>
> I've just discovered that this is causing 'make check' failures on
> my OSX host (unfortunately something in my setup is causing
> 'make check' failures to not always cause a build failure, so I
> didn't notice earlier):
It's only failing on OSX? Every time or only sometimes?
> manooth$ (make -C build/x86 -j8 && cd build/x86 &&
> QTEST_QEMU_BINARY=x86_64-softmmu/qemu-system-x86_64
> QTEST_QEMU_IMG=qemu-img MALLOC_PERTURB_=${MALLOC_PERTURB_:-$((RANDOM %
> 255 + 1))} tests/ahci-test)
> [...]
>
> /x86_64/ahci/flush/simple: OK
> /x86_64/ahci/flush/retry: OK
> /x86_64/ahci/flush/migrate: qemu: qemu_mutex_lock: Invalid argument
> qemu-system-x86_64:Broken pipe
> Not a migration stream
> qemu-system-x86_64: load of migration failed: Invalid argument
OK, let me see if I can find - I do add a mutex in there (src_page_req_mutex)
that I guess is the most likely culprit; it's initialised by
migrate_get_current (once
using a bool) so it should be OK.
If you can find a way to get a backtrace off that qemu_mutex_lock case
that would be great; I'd assume the later errors are the fall out from that.
Dave
>
> thanks
> -- PMM
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
- [Qemu-devel] [PULL 34/57] Postcopy: Maintain unsentmap, (continued)
- [Qemu-devel] [PULL 34/57] Postcopy: Maintain unsentmap, Juan Quintela, 2015/11/10
- [Qemu-devel] [PULL 35/57] migration_completion: Take current state, Juan Quintela, 2015/11/10
- [Qemu-devel] [PULL 37/57] postcopy: ram_enable_notify to switch on userfault, Juan Quintela, 2015/11/10
- [Qemu-devel] [PULL 39/57] Postcopy: End of iteration, Juan Quintela, 2015/11/10
- [Qemu-devel] [PULL 40/57] Page request: Add MIG_RP_MSG_REQ_PAGES reverse command, Juan Quintela, 2015/11/10
- [Qemu-devel] [PULL 41/57] Page request: Process incoming page request, Juan Quintela, 2015/11/10
- [Qemu-devel] [PULL 38/57] Postcopy: Postcopy startup in migration thread, Juan Quintela, 2015/11/10
- [Qemu-devel] [PULL 44/57] Postcopy: Use helpers to map pages during migration, Juan Quintela, 2015/11/10
- [Qemu-devel] [PULL 42/57] Page request: Consume pages off the post-copy queue, Juan Quintela, 2015/11/10
- Re: [Qemu-devel] [PULL 42/57] Page request: Consume pages off the post-copy queue, Peter Maydell, 2015/11/12
- Re: [Qemu-devel] [PULL 42/57] Page request: Consume pages off the post-copy queue,
Dr. David Alan Gilbert <=
- Re: [Qemu-devel] [PULL 42/57] Page request: Consume pages off the post-copy queue, Peter Maydell, 2015/11/12
- Re: [Qemu-devel] [PULL 42/57] Page request: Consume pages off the post-copy queue, Dr. David Alan Gilbert, 2015/11/12
- Re: [Qemu-devel] [PULL 42/57] Page request: Consume pages off the post-copy queue, Peter Maydell, 2015/11/12
- Re: [Qemu-devel] [PULL 42/57] Page request: Consume pages off the post-copy queue, Dr. David Alan Gilbert, 2015/11/12
- Re: [Qemu-devel] [PULL 42/57] Page request: Consume pages off the post-copy queue, Peter Maydell, 2015/11/12
- Re: [Qemu-devel] [PULL 42/57] Page request: Consume pages off the post-copy queue, Peter Maydell, 2015/11/12
- Re: [Qemu-devel] [PULL 42/57] Page request: Consume pages off the post-copy queue, Dr. David Alan Gilbert, 2015/11/12
- Re: [Qemu-devel] [PULL 42/57] Page request: Consume pages off the post-copy queue, Juan Quintela, 2015/11/12
- Re: [Qemu-devel] [PULL 42/57] Page request: Consume pages off the post-copy queue, Dr. David Alan Gilbert, 2015/11/12
- Re: [Qemu-devel] [PULL 42/57] Page request: Consume pages off the post-copy queue, Juan Quintela, 2015/11/12