![[PukiWiki]](image/pukiwiki.png "[PukiWiki]")
*参照元 [#y742ecb8] #backlinks *説明 [#xd2bef15] -パス: 複数あり --CONFIG_MIGRATION 有効: [[linux-4.4.1/mm/migrate.c]] --CONFIG_MIGRATION 無効: [[linux-4.4.1/include/linux/migrate.h]] -FIXME: これは何？ --説明 **引数 [#x5817715] -struct list_head *from -- --[[linux-4.4.1/list_head]] -new_page_t get_new_page -- --[[linux-4.4.1/new_page_t]] -free_page_t put_new_page -- --[[linux-4.4.1/free_page_t]] -unsigned long private -- -enum migrate_mode mode -- --[[linux-4.4.1/migrate_mode]] -int reason -- **返り値 [#bf916d09] -int -- **参考 [#debe2ccf] *実装 [#v4efa0c3] **CONFIG_MIGRATION 有効: linux-4.4.1/mm/migrate.c [#u5d111fb] /* * migrate_pages - migrate the pages specified in a list, to the free pages * supplied as the target for the page migration * * @from: The list of pages to be migrated. * @get_new_page: The function used to allocate free pages to be used * as the target of the page migration. * @put_new_page: The function used to free target pages if migration * fails, or NULL if no special handling is necessary. * @private: Private data to be passed on to get_new_page() * @mode: The migration mode that specifies the constraints for * page migration, if any. * @reason: The reason for page migration. * * The function returns after 10 attempts or if no pages are movable any more * because the list has become empty or no retryable pages exist any more. * The caller should call putback_movable_pages() to return pages to the LRU * or free list only if ret != 0. * * Returns the number of pages that were not migrated, or an error code. */ int migrate_pages(struct list_head *from, new_page_t get_new_page, free_page_t put_new_page, unsigned long private, enum migrate_mode mode, int reason) { int retry = 1; int nr_failed = 0; int nr_succeeded = 0; int pass = 0; struct page *page; struct page *page2; int swapwrite = current->flags & PF_SWAPWRITE; int rc; - --[[linux-4.4.1/page]] if (!swapwrite) current->flags |= PF_SWAPWRITE; for(pass = 0; pass < 10 && retry; pass++) { retry = 0; list_for_each_entry_safe(page, page2, from, lru) { cond_resched(); - --[[linux-4.4.1/list_for_each_entry_safe()]] --[[linux-4.4.1/cond_resched()]] if (PageHuge(page)) rc = unmap_and_move_huge_page(get_new_page, put_new_page, private, page, pass > 2, mode); else rc = unmap_and_move(get_new_page, put_new_page, private, page, pass > 2, mode, reason); - --[[linux-4.4.1/PageHuge()]] --[[linux-4.4.1/unmap_and_move_huge_page()]] --[[linux-4.4.1/unmap_and_move()]] switch(rc) { case -ENOMEM: goto out; case -EAGAIN: retry++; break; case MIGRATEPAGE_SUCCESS: nr_succeeded++; break; default: /* * Permanent failure (-EBUSY, -ENOSYS, etc.): * unlike -EAGAIN case, the failed page is * removed from migration page list and not * retried in the next outer loop. */ nr_failed++; break; } } } nr_failed += retry; rc = nr_failed; out: if (nr_succeeded) count_vm_events(PGMIGRATE_SUCCESS, nr_succeeded); if (nr_failed) count_vm_events(PGMIGRATE_FAIL, nr_failed); trace_mm_migrate_pages(nr_succeeded, nr_failed, mode, reason); - --[[linux-4.4.1/count_vm_events()]] --[[linux-4.4.1/trace_mm_migrate_pages()]] if (!swapwrite) current->flags &= ~PF_SWAPWRITE; return rc; } **CONFIG_MIGRATION 無効: linux-4.4.1/include/linux/migrate.h [#b663a253] static inline int migrate_pages(struct list_head *l, new_page_t new, free_page_t free, unsigned long private, enum migrate_mode mode, int reason) { return -ENOSYS; } *コメント [#ecd31e00]
