vmscan: simplify shrink_inactive_list()
Now, max_scan of shrink_inactive_list() is always passed less than SWAP_CLUSTER_MAX. then, we can remove scanning pages loop in it. This patch also help stack diet. detail - remove "while (nr_scanned < max_scan)" loop - remove nr_freed (now, we use nr_reclaimed directly) - remove nr_scan (now, we use nr_scanned directly) - rename max_scan to nr_to_scan - pass nr_to_scan into isolate_pages() directly instead using SWAP_CLUSTER_MAX [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Rik van Riel <riel@redhat.com> Cc: Dave Chinner <david@fromorbit.com> Cc: Chris Mason <chris.mason@oracle.com> Cc: Nick Piggin <npiggin@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Christoph Hellwig <hch@infradead.org> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Michael Rubin <mrubin@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KOSAKI Motohiro
Linus Torvalds
Родитель
25edde0332
Коммит
e247dbce5c
232
mm/vmscan.c
232
mm/vmscan.c
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@ -1136,15 +1136,21 @@ static int too_many_isolated(struct zone *zone, int file,
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* shrink_inactive_list() is a helper for shrink_zone(). It returns the number
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* of reclaimed pages
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*/
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static unsigned long shrink_inactive_list(unsigned long max_scan,
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static unsigned long shrink_inactive_list(unsigned long nr_to_scan,
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struct zone *zone, struct scan_control *sc,
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int priority, int file)
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{
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LIST_HEAD(page_list);
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struct pagevec pvec;
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unsigned long nr_scanned = 0;
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unsigned long nr_scanned;
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unsigned long nr_reclaimed = 0;
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struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(zone, sc);
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struct page *page;
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unsigned long nr_taken;
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unsigned long nr_active;
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unsigned int count[NR_LRU_LISTS] = { 0, };
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unsigned long nr_anon;
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unsigned long nr_file;
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while (unlikely(too_many_isolated(zone, file, sc))) {
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congestion_wait(BLK_RW_ASYNC, HZ/10);
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@ -1159,129 +1165,115 @@ static unsigned long shrink_inactive_list(unsigned long max_scan,
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lru_add_drain();
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spin_lock_irq(&zone->lru_lock);
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do {
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struct page *page;
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unsigned long nr_taken;
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unsigned long nr_scan;
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unsigned long nr_freed;
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unsigned long nr_active;
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unsigned int count[NR_LRU_LISTS] = { 0, };
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int mode = sc->lumpy_reclaim_mode ? ISOLATE_BOTH : ISOLATE_INACTIVE;
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unsigned long nr_anon;
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unsigned long nr_file;
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if (scanning_global_lru(sc)) {
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nr_taken = isolate_pages_global(SWAP_CLUSTER_MAX,
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&page_list, &nr_scan,
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sc->order, mode,
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zone, 0, file);
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zone->pages_scanned += nr_scan;
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if (current_is_kswapd())
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__count_zone_vm_events(PGSCAN_KSWAPD, zone,
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nr_scan);
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else
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__count_zone_vm_events(PGSCAN_DIRECT, zone,
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nr_scan);
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} else {
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nr_taken = mem_cgroup_isolate_pages(SWAP_CLUSTER_MAX,
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&page_list, &nr_scan,
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sc->order, mode,
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zone, sc->mem_cgroup,
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0, file);
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/*
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* mem_cgroup_isolate_pages() keeps track of
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* scanned pages on its own.
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*/
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}
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if (nr_taken == 0)
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goto done;
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nr_active = clear_active_flags(&page_list, count);
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__count_vm_events(PGDEACTIVATE, nr_active);
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__mod_zone_page_state(zone, NR_ACTIVE_FILE,
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-count[LRU_ACTIVE_FILE]);
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__mod_zone_page_state(zone, NR_INACTIVE_FILE,
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-count[LRU_INACTIVE_FILE]);
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__mod_zone_page_state(zone, NR_ACTIVE_ANON,
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-count[LRU_ACTIVE_ANON]);
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__mod_zone_page_state(zone, NR_INACTIVE_ANON,
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-count[LRU_INACTIVE_ANON]);
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nr_anon = count[LRU_ACTIVE_ANON] + count[LRU_INACTIVE_ANON];
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nr_file = count[LRU_ACTIVE_FILE] + count[LRU_INACTIVE_FILE];
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__mod_zone_page_state(zone, NR_ISOLATED_ANON, nr_anon);
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__mod_zone_page_state(zone, NR_ISOLATED_FILE, nr_file);
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reclaim_stat->recent_scanned[0] += nr_anon;
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reclaim_stat->recent_scanned[1] += nr_file;
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spin_unlock_irq(&zone->lru_lock);
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nr_scanned += nr_scan;
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nr_freed = shrink_page_list(&page_list, sc, PAGEOUT_IO_ASYNC);
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/*
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* If we are direct reclaiming for contiguous pages and we do
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* not reclaim everything in the list, try again and wait
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* for IO to complete. This will stall high-order allocations
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* but that should be acceptable to the caller
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*/
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if (nr_freed < nr_taken && !current_is_kswapd() &&
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sc->lumpy_reclaim_mode) {
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congestion_wait(BLK_RW_ASYNC, HZ/10);
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/*
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* The attempt at page out may have made some
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* of the pages active, mark them inactive again.
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*/
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nr_active = clear_active_flags(&page_list, count);
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count_vm_events(PGDEACTIVATE, nr_active);
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nr_freed += shrink_page_list(&page_list, sc,
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PAGEOUT_IO_SYNC);
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}
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nr_reclaimed += nr_freed;
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local_irq_disable();
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if (scanning_global_lru(sc)) {
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nr_taken = isolate_pages_global(nr_to_scan,
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&page_list, &nr_scanned, sc->order,
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sc->lumpy_reclaim_mode ?
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ISOLATE_BOTH : ISOLATE_INACTIVE,
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zone, 0, file);
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zone->pages_scanned += nr_scanned;
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if (current_is_kswapd())
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__count_vm_events(KSWAPD_STEAL, nr_freed);
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__count_zone_vm_events(PGSTEAL, zone, nr_freed);
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spin_lock(&zone->lru_lock);
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__count_zone_vm_events(PGSCAN_KSWAPD, zone,
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nr_scanned);
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else
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__count_zone_vm_events(PGSCAN_DIRECT, zone,
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nr_scanned);
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} else {
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nr_taken = mem_cgroup_isolate_pages(nr_to_scan,
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&page_list, &nr_scanned, sc->order,
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sc->lumpy_reclaim_mode ?
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ISOLATE_BOTH : ISOLATE_INACTIVE,
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zone, sc->mem_cgroup,
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0, file);
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/*
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* Put back any unfreeable pages.
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* mem_cgroup_isolate_pages() keeps track of
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* scanned pages on its own.
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*/
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while (!list_empty(&page_list)) {
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int lru;
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page = lru_to_page(&page_list);
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VM_BUG_ON(PageLRU(page));
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list_del(&page->lru);
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if (unlikely(!page_evictable(page, NULL))) {
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spin_unlock_irq(&zone->lru_lock);
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putback_lru_page(page);
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spin_lock_irq(&zone->lru_lock);
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continue;
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}
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SetPageLRU(page);
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lru = page_lru(page);
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add_page_to_lru_list(zone, page, lru);
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if (is_active_lru(lru)) {
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int file = is_file_lru(lru);
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reclaim_stat->recent_rotated[file]++;
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}
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if (!pagevec_add(&pvec, page)) {
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spin_unlock_irq(&zone->lru_lock);
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__pagevec_release(&pvec);
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spin_lock_irq(&zone->lru_lock);
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}
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}
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__mod_zone_page_state(zone, NR_ISOLATED_ANON, -nr_anon);
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__mod_zone_page_state(zone, NR_ISOLATED_FILE, -nr_file);
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}
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} while (nr_scanned < max_scan);
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if (nr_taken == 0)
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goto done;
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nr_active = clear_active_flags(&page_list, count);
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__count_vm_events(PGDEACTIVATE, nr_active);
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__mod_zone_page_state(zone, NR_ACTIVE_FILE,
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-count[LRU_ACTIVE_FILE]);
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__mod_zone_page_state(zone, NR_INACTIVE_FILE,
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-count[LRU_INACTIVE_FILE]);
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__mod_zone_page_state(zone, NR_ACTIVE_ANON,
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-count[LRU_ACTIVE_ANON]);
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__mod_zone_page_state(zone, NR_INACTIVE_ANON,
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-count[LRU_INACTIVE_ANON]);
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nr_anon = count[LRU_ACTIVE_ANON] + count[LRU_INACTIVE_ANON];
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nr_file = count[LRU_ACTIVE_FILE] + count[LRU_INACTIVE_FILE];
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__mod_zone_page_state(zone, NR_ISOLATED_ANON, nr_anon);
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__mod_zone_page_state(zone, NR_ISOLATED_FILE, nr_file);
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reclaim_stat->recent_scanned[0] += nr_anon;
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reclaim_stat->recent_scanned[1] += nr_file;
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spin_unlock_irq(&zone->lru_lock);
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nr_reclaimed = shrink_page_list(&page_list, sc, PAGEOUT_IO_ASYNC);
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/*
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* If we are direct reclaiming for contiguous pages and we do
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* not reclaim everything in the list, try again and wait
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* for IO to complete. This will stall high-order allocations
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* but that should be acceptable to the caller
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*/
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if (nr_reclaimed < nr_taken && !current_is_kswapd() &&
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sc->lumpy_reclaim_mode) {
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congestion_wait(BLK_RW_ASYNC, HZ/10);
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/*
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* The attempt at page out may have made some
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* of the pages active, mark them inactive again.
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*/
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nr_active = clear_active_flags(&page_list, count);
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count_vm_events(PGDEACTIVATE, nr_active);
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nr_reclaimed += shrink_page_list(&page_list, sc, PAGEOUT_IO_SYNC);
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}
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local_irq_disable();
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if (current_is_kswapd())
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__count_vm_events(KSWAPD_STEAL, nr_reclaimed);
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__count_zone_vm_events(PGSTEAL, zone, nr_reclaimed);
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spin_lock(&zone->lru_lock);
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/*
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* Put back any unfreeable pages.
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*/
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while (!list_empty(&page_list)) {
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int lru;
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page = lru_to_page(&page_list);
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VM_BUG_ON(PageLRU(page));
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list_del(&page->lru);
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if (unlikely(!page_evictable(page, NULL))) {
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spin_unlock_irq(&zone->lru_lock);
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putback_lru_page(page);
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spin_lock_irq(&zone->lru_lock);
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continue;
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}
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SetPageLRU(page);
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lru = page_lru(page);
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add_page_to_lru_list(zone, page, lru);
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if (is_active_lru(lru)) {
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int file = is_file_lru(lru);
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reclaim_stat->recent_rotated[file]++;
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}
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if (!pagevec_add(&pvec, page)) {
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spin_unlock_irq(&zone->lru_lock);
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__pagevec_release(&pvec);
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spin_lock_irq(&zone->lru_lock);
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}
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}
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__mod_zone_page_state(zone, NR_ISOLATED_ANON, -nr_anon);
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__mod_zone_page_state(zone, NR_ISOLATED_FILE, -nr_file);
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done:
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spin_unlock_irq(&zone->lru_lock);
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