Re: [Xen-devel] [PATCH 0/4] fix freemem loop

[Mike Latimer <mlatimer@xxxxxxxx>]

On Tuesday, March 03, 2015 11:08:38 AM Stefano Stabellini wrote:
> Hi all,
> 
> this patch series fixes the freemem loop on machines with very large
> amount of memory, where the current wait time is not enough.
> 
> In order to be able to handle arbitrarly large amount of ram, we
> implement in libxl_wait_for_memory_target a policy of waiting until dom0
> is making progress.  The patch series also reverts "libxl: Wait for
> ballooning if free memory is increasing", that is not actually
> implemented correctly.
>
> Stefano Stabellini (4):
>       Revert "libxl: Wait for ballooning if free memory is increasing"
>       libxl_wait_for_memory_target: wait as long as dom0 is making progress
>       freemem: remove call to libxl_wait_for_free_memory
>       libxl_wait_for_memory_target: wait for 2 sec at a time
> 
>  tools/libxl/libxl.c      |   31 +++++++++++++++++++++++--------
>  tools/libxl/xl_cmdimpl.c |   29 ++++++-----------------------
>  2 files changed, 29 insertions(+), 31 deletions(-)

I just tested this whole series and it works well in my environment (64G - 
512G guests). dom0 now balloons down just the required amount. Also, domU 
startup works the first time, as it correctly waits until memory is freed. 
(Using dom0_mem is still a preferred option, as the ballooning delay can be 
significant.)

Thanks for all the help and patience as we've worked through this. Ack to the 
whole series:

Acked-by: Mike Latimer <mlatimer@xxxxxxxx>

-Mike

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