On Sat, Aug 30, 2014 at 1:38 AM, Andrew Morton
<akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> On Wed, 20 Aug 2014 19:05:09 +0400 Konstantin Khlebnikov <k.khlebnikov@xxxxxxxxxxx> wrote:
>
>> * move special branch for balloon migraion into migrate_pages
>> * remove special mapping for balloon and its flag AS_BALLOON_MAP
>> * embed struct balloon_dev_info into struct virtio_balloon
>> * cleanup balloon_page_dequeue, kill balloon_page_free
>
> Another testing failure. Guys, allnoconfig is really fast.
Heh, mea culpa too. I've missed messages about including my patches except one
with stress-test, probably they are stuck somewhere in my corporate email.
So I thought you've picked only one patch.
Rafael had several suggestions so I postponed them till v2 patchset
which never been sent.
>
>> --- a/include/linux/balloon_compaction.h
>> +++ b/include/linux/balloon_compaction.h
>> @@ -54,58 +54,27 @@
>> * balloon driver as a page book-keeper for its registered balloon devices.
>> */
>> struct balloon_dev_info {
>> - void *balloon_device; /* balloon device descriptor */
>> - struct address_space *mapping; /* balloon special page->mapping */
>> unsigned long isolated_pages; /* # of isolated pages for migration */
>> spinlock_t pages_lock; /* Protection to pages list */
>> struct list_head pages; /* Pages enqueued & handled to Host */
>> + int (* migrate_page)(struct balloon_dev_info *, struct page *newpage,
>> + struct page *page, enum migrate_mode mode);
>> };
>
> If CONFIG_MIGRATION=n this gets turned into "NULL" and chaos ensues. I
> think I'll just nuke that #define:
Hmm, i think it's better to rename migrate_page() into something less generic.
for example generic_migrate_page() or generic_migratepage().
>
> --- a/include/linux/migrate.h~include-linux-migrateh-remove-migratepage-define
> +++ a/include/linux/migrate.h
> @@ -82,9 +82,6 @@ static inline int migrate_huge_page_move
> return -ENOSYS;
> }
>
> -/* Possible settings for the migrate_page() method in address_operations */
> -#define migrate_page NULL
> -
> #endif /* CONFIG_MIGRATION */
>
> #ifdef CONFIG_NUMA_BALANCING
> --- a/mm/swap_state.c~include-linux-migrateh-remove-migratepage-define
> +++ a/mm/swap_state.c
> @@ -28,7 +28,9 @@
> static const struct address_space_operations swap_aops = {
> .writepage = swap_writepage,
> .set_page_dirty = swap_set_page_dirty,
> +#ifdef CONFIG_MIGRATION
> .migratepage = migrate_page,
> +#endif
> };
>
> static struct backing_dev_info swap_backing_dev_info = {
> --- a/mm/shmem.c~include-linux-migrateh-remove-migratepage-define
> +++ a/mm/shmem.c
> @@ -3075,7 +3075,9 @@ static const struct address_space_operat
> .write_begin = shmem_write_begin,
> .write_end = shmem_write_end,
> #endif
> +#ifdef CONFIG_MIGRATION
> .migratepage = migrate_page,
> +#endif
> .error_remove_page = generic_error_remove_page,
> };
>
>
> Our mixture of "migratepage" and "migrate_page" is maddening.
>
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