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#author("2025-09-11T20:07:53+09:00","default:guest","guest") #author("2025-09-11T20:08:43+09:00","default:guest","guest") *参照元 [#j5150125] #backlinks *説明 [#e531e8c6] -パス: [[linux-5.15/mm/vmscan.c]] -FIXME: これは何？ --説明 **引数 [#bf840f83] --unsigned long nr_to_scan -- -struct lruvec *lruvec -- --[[linux-5.15/lruvec]] -struct scan_control *sc -- --[[linux-5.15/scan_control]] -enum lru_list lru -- --[[linux-5.15/lru_list]] **返り値 [#zfccce4b] - -- -unsigned long --回収したページ数。 **参考 [#b08f9718] *実装 [#neeac27a] /* * shrink_inactive_list() is a helper for shrink_node(). It returns the number * of reclaimed pages */ static unsigned long shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec, struct scan_control *sc, enum lru_list lru) { LIST_HEAD(page_list); unsigned long nr_scanned; unsigned int nr_reclaimed = 0; unsigned long nr_taken; struct reclaim_stat stat; bool file = is_file_lru(lru); enum vm_event_item item; struct pglist_data *pgdat = lruvec_pgdat(lruvec); bool stalled = false; - --[[linux-5.15/LIST_HEAD()]] --[[linux-5.15/reclaim_stat]] --[[linux-5.15/is_file_lru()]] --[[linux-5.15/vm_event_item]] --[[linux-5.15/pglist_data]] --[[linux-5.15/lruvec_pgdat()]] while (unlikely(too_many_isolated(pgdat, file, sc))) { if (stalled) return 0; /* wait a bit for the reclaimer. */ msleep(100); stalled = true; /* We are about to die and free our memory. Return now. */ if (fatal_signal_pending(current)) return SWAP_CLUSTER_MAX; } - --[[linux-5.15/unlikely()]] --[[linux-5.15/too_many_isolated()]] --[[linux-5.15/msleep()]] --[[linux-5.15/fatal_signal_pending()]] lru_add_drain(); - --[[linux-5.15/lru_add_drain()]] spin_lock_irq(&lruvec->lru_lock); nr_taken = isolate_lru_pages(nr_to_scan, lruvec, &page_list, &nr_scanned, sc, lru); - --[[linux-5.15/spin_lock_irq()]] --[[linux-5.15/isolate_lru_pages()]] __mod_node_page_state(pgdat, NR_ISOLATED_ANON + file, nr_taken); item = current_is_kswapd() ? PGSCAN_KSWAPD : PGSCAN_DIRECT; if (!cgroup_reclaim(sc)) __count_vm_events(item, nr_scanned); __count_memcg_events(lruvec_memcg(lruvec), item, nr_scanned); __count_vm_events(PGSCAN_ANON + file, nr_scanned); spin_unlock_irq(&lruvec->lru_lock); - --[[linux-5.15/__mod_node_page_state()]] --[[linux-5.15/current_is_kswapd()]] --[[linux-5.15/cgroup_reclaim()]] --[[linux-5.15/lruvec_memcg()]] --[[linux-5.15/__count_vm_events()]] --[[linux-5.15/__count_memcg_events()]] --[[linux-5.15/spin_unlock_irq()]] if (nr_taken == 0) return 0; nr_reclaimed = shrink_page_list(&page_list, pgdat, sc, &stat, false); - --[[linux-5.15/shrink_page_list()]] spin_lock_irq(&lruvec->lru_lock); move_pages_to_lru(lruvec, &page_list); - --[[linux-5.15/spin_lock_irq()]] --[[linux-5.15/move_pages_to_lru()]] __mod_node_page_state(pgdat, NR_ISOLATED_ANON + file, -nr_taken); item = current_is_kswapd() ? PGSTEAL_KSWAPD : PGSTEAL_DIRECT; if (!cgroup_reclaim(sc)) __count_vm_events(item, nr_reclaimed); __count_memcg_events(lruvec_memcg(lruvec), item, nr_reclaimed); __count_vm_events(PGSTEAL_ANON + file, nr_reclaimed); spin_unlock_irq(&lruvec->lru_lock); - --[[linux-5.15/__mod_node_page_state()]] --[[linux-5.15/current_is_kswapd()]] --[[linux-5.15/cgroup_reclaim()]] --[[linux-5.15/__count_vm_events()]] --[[linux-5.15/__count_memcg_events()]] --[[linux-5.15/lruvec_memcg()]] --[[linux-5.15/spin_unlock_irq()]] lru_note_cost(lruvec, file, stat.nr_pageout); mem_cgroup_uncharge_list(&page_list); free_unref_page_list(&page_list); - --[[linux-5.15/lru_note_cost()]] --[[linux-5.15/mem_cgroup_uncharge_list()]] --[[linux-5.15/free_unref_page_list()]] /* * If dirty pages are scanned that are not queued for IO, it * implies that flushers are not doing their job. This can * happen when memory pressure pushes dirty pages to the end of * the LRU before the dirty limits are breached and the dirty * data has expired. It can also happen when the proportion of * dirty pages grows not through writes but through memory * pressure reclaiming all the clean cache. And in some cases, * the flushers simply cannot keep up with the allocation * rate. Nudge the flusher threads in case they are asleep. */ if (stat.nr_unqueued_dirty == nr_taken) wakeup_flusher_threads(WB_REASON_VMSCAN); - --[[linux-5.15/wakeup_flusher_threads()]] sc->nr.dirty += stat.nr_dirty; sc->nr.congested += stat.nr_congested; sc->nr.unqueued_dirty += stat.nr_unqueued_dirty; sc->nr.writeback += stat.nr_writeback; sc->nr.immediate += stat.nr_immediate; sc->nr.taken += nr_taken; if (file) sc->nr.file_taken += nr_taken; trace_mm_vmscan_lru_shrink_inactive(pgdat->node_id, nr_scanned, nr_reclaimed, &stat, sc->priority, file); return nr_reclaimed; } - --[[linux-5.15/trace_mm_vmscan_lru_shrink_inactive()]] *コメント [#ya3f37e6]
