linux-4.4.1/__alloc_contig_migrate_range() の履歴(No.1)

• 履歴一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• linux-4.4.1/__alloc_contig_migrate_range() へ行く。
  • 1 (2017-09-15 (金) 19:37:59)

参照元†

• linux-4.4.1/alloc_contig_range()

説明†

• パス: linux-4.4.1/mm/page_alloc.c

• FIXME: これは何？
  • 説明

引数†

• struct compact_control *cc
  • linux-4.4.1/compact_control
• unsigned long start
• unsigned long end

返り値†

• int

参考†

実装†

/* [start, end) must belong to a single zone. */
static int __alloc_contig_migrate_range(struct compact_control *cc,
                                        unsigned long start, unsigned long end)
{               
        /* This function is based on compact_zone() from compaction.c. */
        unsigned long nr_reclaimed;
        unsigned long pfn = start;
        unsigned int tries = 0;
        int ret = 0;    

        migrate_prep();

• • linux-4.4.1/migrate_prep()

        while (pfn < end || !list_empty(&cc->migratepages)) {
                if (fatal_signal_pending(current)) {
                        ret = -EINTR;
                        break;
                }

• • linux-4.4.1/list_empty()
  • linux-4.4.1/fatal_signal_pending()

                if (list_empty(&cc->migratepages)) {
                        cc->nr_migratepages = 0;
                        pfn = isolate_migratepages_range(cc, pfn, end);
                        if (!pfn) {
                                ret = -EINTR;
                                break;
                        }
                        tries = 0;
                } else if (++tries == 5) {
                        ret = ret < 0 ? ret : -EBUSY;
                        break;
                }

• • linux-4.4.1/isolate_migratepages_range()

                nr_reclaimed = reclaim_clean_pages_from_list(cc->zone,
                                                        &cc->migratepages);
                cc->nr_migratepages -= nr_reclaimed;

• • linux-4.4.1/reclaim_clean_pages_from_list()

                ret = migrate_pages(&cc->migratepages, alloc_migrate_target,
                                    NULL, 0, cc->mode, MR_CMA);

• • linux-4.4.1/migrate_pages()

        }
        if (ret < 0) {
                putback_movable_pages(&cc->migratepages);

• • linux-4.4.1/putback_movable_pages()

                return ret;
        }
        return 0;
}

コメント†