Do not top post please
On Wed 04-09-19 07:27:25, sunqiuyang wrote:
> isolate_migratepages_block() from another thread may try to isolate the page again:
>
> for (; low_pfn < end_pfn; low_pfn++) {
> /* ... */
> page = pfn_to_page(low_pfn);
> /* ... */
> if (!PageLRU(page)) {
> if (unlikely(__PageMovable(page)) && !PageIsolated(page)) {
> /* ... */
> if (!isolate_movable_page(page, isolate_mode))
> goto isolate_success;
> /*... */
> isolate_success:
> list_add(&page->lru, &cc->migratepages);
>
> And this page will be added to another list.
> Or, do you see any reason that the page cannot go through this path?
The page shouldn't be __PageMovable after the migration is done. All the
state should have been transfered to the new page IIUC.
--
Michal Hocko
SUSE Labs
