diff options
| -rw-r--r-- | mm/vmscan.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index ce2ee8331414..92e56cadceae 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1153,13 +1153,18 @@ static unsigned long shrink_page_list(struct list_head *page_list, if (PageDirty(page)) { /* - * Only kswapd can writeback filesystem pages to - * avoid risk of stack overflow but only writeback - * if many dirty pages have been encountered. + * Only kswapd can writeback filesystem pages + * to avoid risk of stack overflow. But avoid + * injecting inefficient single-page IO into + * flusher writeback as much as possible: only + * write pages when we've encountered many + * dirty pages, and when we've already scanned + * the rest of the LRU for clean pages and see + * the same dirty pages again (PageReclaim). */ if (page_is_file_cache(page) && - (!current_is_kswapd() || - !test_bit(PGDAT_DIRTY, &pgdat->flags))) { + (!current_is_kswapd() || !PageReclaim(page) || + !test_bit(PGDAT_DIRTY, &pgdat->flags))) { /* * Immediately reclaim when written back. * Similar in principal to deactivate_page() |