Re: [Qemu-devel] [PATCH] migration: ensure htab_save_first completes after timeout

[David Gibson]

On Wed, Feb 10, 2016 at 10:20:40AM -0800, Jianjun Duan wrote:
> htab_save_first_pass could return without finishing its work due to
> timeout. The patch checks if another invocation of it is necessary and
> will call it in htab_save_complete if necessary.
> 
> Signed-off-by: Jianjun Duan <address@hidden>

Looks good, applied to ppc-for-2.6 (with a small fix to remove the
overly long line).

> ---
>  hw/ppc/spapr.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index 6bfb908..f6b6749 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -1317,6 +1317,7 @@ static int htab_save_setup(QEMUFile *f, void *opaque)
>  static void htab_save_first_pass(QEMUFile *f, sPAPRMachineState *spapr,
>                                   int64_t max_ns)
>  {
> +    bool has_timeout = max_ns != -1;
>      int htabslots = HTAB_SIZE(spapr) / HASH_PTE_SIZE_64;
>      int index = spapr->htab_save_index;
>      int64_t starttime = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
> @@ -1350,7 +1351,7 @@ static void htab_save_first_pass(QEMUFile *f, 
> sPAPRMachineState *spapr,
>              qemu_put_buffer(f, HPTE(spapr->htab, chunkstart),
>                              HASH_PTE_SIZE_64 * n_valid);
>  
> -            if ((qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - starttime) > 
> max_ns) {
> +            if (has_timeout && (qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - 
> starttime) > max_ns) {
>                  break;
>              }
>          }
> @@ -1503,6 +1504,9 @@ static int htab_save_complete(QEMUFile *f, void *opaque)
>          close(spapr->htab_fd);
>          spapr->htab_fd = -1;
>      } else {
> +        if (spapr->htab_first_pass) {
> +            htab_save_first_pass(f, spapr, -1);
> +        }
>          htab_save_later_pass(f, spapr, -1);
>      }
>  

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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