Re: [PATCH v5 04/14] libxc/migration: Pass checkpoint information into the save algorithm.

From: Ian Campbell <ian.campbell@citrix.com>
To: Yang Hongyang <yanghy@cn.fujitsu.com>
Cc: wei.liu2@citrix.com, eddie.dong@intel.com, wency@cn.fujitsu.com,
	andrew.cooper3@citrix.com, yunhong.jiang@intel.com,
	ian.jackson@eu.citrix.com, xen-devel@lists.xen.org,
	rshriram@cs.ubc.ca
Subject: Re: [PATCH v5 04/14] libxc/migration: Pass checkpoint information into the save algorithm.
Date: Wed, 13 May 2015 16:49:29 +0100	[thread overview]
Message-ID: <1431532169.8263.343.camel@citrix.com> (raw)
In-Reply-To: <1431482044-21286-5-git-send-email-yanghy@cn.fujitsu.com>

On Wed, 2015-05-13 at 09:53 +0800, Yang Hongyang wrote:
> From: Andrew Cooper <andrew.cooper3@citrix.com>

OOI how was this signalled to the old code?

> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
> CC: Ian Campbell <Ian.Campbell@citrix.com>
> CC: Ian Jackson <Ian.Jackson@eu.citrix.com>
> CC: Wei Liu <wei.liu2@citrix.com>
> CC: Yang Hongyang <yanghy@cn.fujitsu.com>
> ---
>  tools/libxc/include/xenguest.h | 1 +
>  tools/libxc/xc_sr_common.h     | 3 +++
>  tools/libxc/xc_sr_save.c       | 3 +++
>  tools/libxl/libxl_dom.c        | 1 +
>  4 files changed, 8 insertions(+)
> 
> diff --git a/tools/libxc/include/xenguest.h b/tools/libxc/include/xenguest.h
> index 8e39075..7581263 100644
> --- a/tools/libxc/include/xenguest.h
> +++ b/tools/libxc/include/xenguest.h
> @@ -30,6 +30,7 @@
>  #define XCFLAGS_HVM       (1 << 2)
>  #define XCFLAGS_STDVGA    (1 << 3)
>  #define XCFLAGS_CHECKPOINT_COMPRESS    (1 << 4)
> +#define XCFLAGS_CHECKPOINTED    (1 << 5)
>  
>  #define X86_64_B_SIZE   64 
>  #define X86_32_B_SIZE   32
> diff --git a/tools/libxc/xc_sr_common.h b/tools/libxc/xc_sr_common.h
> index c4fe92c..c0f90d4 100644
> --- a/tools/libxc/xc_sr_common.h
> +++ b/tools/libxc/xc_sr_common.h
> @@ -174,6 +174,9 @@ struct xc_sr_context
>              /* Live migrate vs non live suspend. */
>              bool live;
>  
> +            /* Plain VM, or checkpoints over time. */
> +            bool checkpointed;
> +
>              /* Further debugging information in the stream. */
>              bool debug;
>  
> diff --git a/tools/libxc/xc_sr_save.c b/tools/libxc/xc_sr_save.c
> index 66fcd3e..caa727d 100644
> --- a/tools/libxc/xc_sr_save.c
> +++ b/tools/libxc/xc_sr_save.c
> @@ -732,6 +732,7 @@ int xc_domain_save2(xc_interface *xch, int io_fd, uint32_t dom,
>      ctx.save.callbacks = callbacks;
>      ctx.save.live  = !!(flags & XCFLAGS_LIVE);
>      ctx.save.debug = !!(flags & XCFLAGS_DEBUG);
> +    ctx.save.checkpointed = !!(flags & XCFLAGS_CHECKPOINTED);
>  
>      /*
>       * TODO: Find some time to better tweak the live migration algorithm.
> @@ -745,6 +746,8 @@ int xc_domain_save2(xc_interface *xch, int io_fd, uint32_t dom,
>      /* Sanity checks for callbacks. */
>      if ( hvm )
>          assert(callbacks->switch_qemu_logdirty);
> +    if ( ctx.save.checkpointed )
> +        assert(callbacks->checkpoint && callbacks->postcopy);
>  
>      IPRINTF("In experimental %s", __func__);
>      DPRINTF("fd %d, dom %u, max_iters %u, max_factor %u, flags %u, hvm %d",
> diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
> index f408646..a0c9850 100644
> --- a/tools/libxl/libxl_dom.c
> +++ b/tools/libxl/libxl_dom.c
> @@ -2003,6 +2003,7 @@ void libxl__domain_suspend(libxl__egc *egc, libxl__domain_suspend_state *dss)
>  
>      if (r_info != NULL) {
>          dss->interval = r_info->interval;
> +        dss->xcflags |= XCFLAGS_CHECKPOINTED;
>          if (libxl_defbool_val(r_info->compression))
>              dss->xcflags |= XCFLAGS_CHECKPOINT_COMPRESS;
>      }