On Sat 16-03-13 14:42:04, K. Y. Srinivasan wrote:
> The split_page() function will be very useful for balloon drivers. On Hyper-V,
> it will be very efficient to use 2M allocations in the guest as this (a) makes
> the ballooning protocol with the host that much more efficient and (b) moving
> memory in 2M chunks minimizes fragmentation in the host. Export the split_page()
> function to let the guest allocations be in 2M chunks while the host is free to
> return this memory at arbitrary granularity.
>
> Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
I do not have any objections to exporting the symbol (at least we
prevent drivers code from inventing their own split_page) but the
Hyper-V specific description should go into Hyper-V patch IMO.
So for the export with a short note that the symbol will be used by
Hyper-V
Acked-by: Michal Hocko <mhocko@xxxxxxx>
> ---
> mm/page_alloc.c | 1 +
> 1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 6cacfee..7e0ead6 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -1404,6 +1404,7 @@ void split_page(struct page *page, unsigned int order)
> for (i = 1; i < (1 << order); i++)
> set_page_refcounted(page + i);
> }
> +EXPORT_SYMBOL_GPL(split_page);
>
> static int __isolate_free_page(struct page *page, unsigned int order)
> {
> --
> 1.7.4.1
>
> --
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--
Michal Hocko
SUSE Labs
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