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Re: [Qemu-devel] QEMU live block-migration

From: Michael Roth
Subject: Re: [Qemu-devel] QEMU live block-migration
Date: Mon, 08 Jul 2013 10:32:04 -0500
User-agent: alot/0.3.4

Quoting Yaodong Yang (2013-07-07 09:55:06)
> Hello everyone,
>    I have a short question about the implementation of QEMU. When the qemu
>    perform the live block migration using "migrate -b tcp:...." command. Does
>    a new thread for migration created or not? I went through the code, only
>    find that this activity is triggered in the main loop (main_loop_wait(int

An outgoing non-blocking connection is triggered by
tcp_start_outgoing_migration, once the connection is completed the
tcp_wait_for_connect() callback is executed by the main loop.

>    nonblocking) function). I want to know is there a new dedicated thread
>    created for this migration task or not? If so, where in the code the new
>    thread created.

Within that callback there's a call to migrate_fd_connect(), which is where the
migration thread is created.

Incoming migration is still handled by the main loop's thread

>    Thanks!
>    Yaodong
>    --
>    Yaodong Yang
>    Computer Science and Engineering Department
>    University of Nebraska--Lincoln, 
>    Lincoln, NE, U.S.A.

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