Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752627Ab0DOKXM (ORCPT ); Thu, 15 Apr 2010 06:23:12 -0400 Received: from fgwmail5.fujitsu.co.jp ([192.51.44.35]:35229 "EHLO fgwmail5.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752356Ab0DOKXI (ORCPT ); Thu, 15 Apr 2010 06:23:08 -0400 X-SecurityPolicyCheck-FJ: OK by FujitsuOutboundMailChecker v1.3.1 From: KOSAKI Motohiro To: KOSAKI Motohiro Subject: [PATCH 1/4] vmscan: simplify shrink_inactive_list() Cc: kosaki.motohiro@jp.fujitsu.com, Dave Chinner , Mel Gorman , Chris Mason , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org In-Reply-To: <20100415185310.D1A1.A69D9226@jp.fujitsu.com> References: <20100415085420.GT2493@dastard> <20100415185310.D1A1.A69D9226@jp.fujitsu.com> Message-Id: <20100415192140.D1A4.A69D9226@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: Becky! ver. 2.50.07 [ja] Date: Thu, 15 Apr 2010 19:23:04 +0900 (JST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 8504 Lines: 256 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 Signed-off-by: KOSAKI Motohiro --- mm/vmscan.c | 190 ++++++++++++++++++++++++++++------------------------------- 1 files changed, 89 insertions(+), 101 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index eab6028..4de4029 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1137,16 +1137,22 @@ static int too_many_isolated(struct zone *zone, int file, * shrink_inactive_list() is a helper for shrink_zone(). It returns the number * of reclaimed pages */ -static unsigned long shrink_inactive_list(unsigned long max_scan, +static unsigned long shrink_inactive_list(unsigned long nr_to_scan, struct zone *zone, struct scan_control *sc, int file) { LIST_HEAD(page_list); struct pagevec pvec; - unsigned long nr_scanned = 0; + unsigned long nr_scanned; unsigned long nr_reclaimed = 0; struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(zone, sc); int lumpy_reclaim = 0; + struct page *page; + unsigned long nr_taken; + unsigned long nr_active; + unsigned int count[NR_LRU_LISTS] = { 0, }; + unsigned long nr_anon; + unsigned long nr_file; while (unlikely(too_many_isolated(zone, file, sc))) { congestion_wait(BLK_RW_ASYNC, HZ/10); @@ -1172,119 +1178,101 @@ static unsigned long shrink_inactive_list(unsigned long max_scan, lru_add_drain(); spin_lock_irq(&zone->lru_lock); - do { - struct page *page; - unsigned long nr_taken; - unsigned long nr_scan; - unsigned long nr_freed; - unsigned long nr_active; - unsigned int count[NR_LRU_LISTS] = { 0, }; - int mode = lumpy_reclaim ? ISOLATE_BOTH : ISOLATE_INACTIVE; - unsigned long nr_anon; - unsigned long nr_file; - - nr_taken = sc->isolate_pages(SWAP_CLUSTER_MAX, - &page_list, &nr_scan, sc->order, mode, - zone, sc->mem_cgroup, 0, file); + nr_taken = sc->isolate_pages(nr_to_scan, + &page_list, &nr_scanned, sc->order, + lumpy_reclaim ? ISOLATE_BOTH : ISOLATE_INACTIVE, + zone, sc->mem_cgroup, 0, file); - if (scanning_global_lru(sc)) { - zone->pages_scanned += nr_scan; - if (current_is_kswapd()) - __count_zone_vm_events(PGSCAN_KSWAPD, zone, - nr_scan); - else - __count_zone_vm_events(PGSCAN_DIRECT, zone, - nr_scan); - } + if (scanning_global_lru(sc)) { + zone->pages_scanned += nr_scanned; + if (current_is_kswapd()) + __count_zone_vm_events(PGSCAN_KSWAPD, zone, nr_scanned); + else + __count_zone_vm_events(PGSCAN_DIRECT, zone, nr_scanned); + } - if (nr_taken == 0) - goto done; + if (nr_taken == 0) + goto done; - nr_active = clear_active_flags(&page_list, count); - __count_vm_events(PGDEACTIVATE, nr_active); + nr_active = clear_active_flags(&page_list, count); + __count_vm_events(PGDEACTIVATE, nr_active); - __mod_zone_page_state(zone, NR_ACTIVE_FILE, - -count[LRU_ACTIVE_FILE]); - __mod_zone_page_state(zone, NR_INACTIVE_FILE, - -count[LRU_INACTIVE_FILE]); - __mod_zone_page_state(zone, NR_ACTIVE_ANON, - -count[LRU_ACTIVE_ANON]); - __mod_zone_page_state(zone, NR_INACTIVE_ANON, - -count[LRU_INACTIVE_ANON]); + __mod_zone_page_state(zone, NR_ACTIVE_FILE, + -count[LRU_ACTIVE_FILE]); + __mod_zone_page_state(zone, NR_INACTIVE_FILE, + -count[LRU_INACTIVE_FILE]); + __mod_zone_page_state(zone, NR_ACTIVE_ANON, + -count[LRU_ACTIVE_ANON]); + __mod_zone_page_state(zone, NR_INACTIVE_ANON, + -count[LRU_INACTIVE_ANON]); - nr_anon = count[LRU_ACTIVE_ANON] + count[LRU_INACTIVE_ANON]; - nr_file = count[LRU_ACTIVE_FILE] + count[LRU_INACTIVE_FILE]; - __mod_zone_page_state(zone, NR_ISOLATED_ANON, nr_anon); - __mod_zone_page_state(zone, NR_ISOLATED_FILE, nr_file); + nr_anon = count[LRU_ACTIVE_ANON] + count[LRU_INACTIVE_ANON]; + nr_file = count[LRU_ACTIVE_FILE] + count[LRU_INACTIVE_FILE]; + __mod_zone_page_state(zone, NR_ISOLATED_ANON, nr_anon); + __mod_zone_page_state(zone, NR_ISOLATED_FILE, nr_file); - reclaim_stat->recent_scanned[0] += nr_anon; - reclaim_stat->recent_scanned[1] += nr_file; + reclaim_stat->recent_scanned[0] += nr_anon; + reclaim_stat->recent_scanned[1] += nr_file; - spin_unlock_irq(&zone->lru_lock); + spin_unlock_irq(&zone->lru_lock); - nr_scanned += nr_scan; - nr_freed = shrink_page_list(&page_list, sc, PAGEOUT_IO_ASYNC); + nr_reclaimed = shrink_page_list(&page_list, sc, PAGEOUT_IO_ASYNC); + + /* + * If we are direct reclaiming for contiguous pages and we do + * not reclaim everything in the list, try again and wait + * for IO to complete. This will stall high-order allocations + * but that should be acceptable to the caller + */ + if (nr_reclaimed < nr_taken && !current_is_kswapd() && lumpy_reclaim) { + congestion_wait(BLK_RW_ASYNC, HZ/10); /* - * If we are direct reclaiming for contiguous pages and we do - * not reclaim everything in the list, try again and wait - * for IO to complete. This will stall high-order allocations - * but that should be acceptable to the caller + * The attempt at page out may have made some + * of the pages active, mark them inactive again. */ - if (nr_freed < nr_taken && !current_is_kswapd() && - lumpy_reclaim) { - congestion_wait(BLK_RW_ASYNC, HZ/10); - - /* - * The attempt at page out may have made some - * of the pages active, mark them inactive again. - */ - nr_active = clear_active_flags(&page_list, count); - count_vm_events(PGDEACTIVATE, nr_active); - - nr_freed += shrink_page_list(&page_list, sc, - PAGEOUT_IO_SYNC); - } + nr_active = clear_active_flags(&page_list, count); + count_vm_events(PGDEACTIVATE, nr_active); - nr_reclaimed += nr_freed; + nr_reclaimed += shrink_page_list(&page_list, sc, + PAGEOUT_IO_SYNC); + } - local_irq_disable(); - if (current_is_kswapd()) - __count_vm_events(KSWAPD_STEAL, nr_freed); - __count_zone_vm_events(PGSTEAL, zone, nr_freed); + local_irq_disable(); + if (current_is_kswapd()) + __count_vm_events(KSWAPD_STEAL, nr_reclaimed); + __count_zone_vm_events(PGSTEAL, zone, nr_reclaimed); - spin_lock(&zone->lru_lock); - /* - * Put back any unfreeable pages. - */ - while (!list_empty(&page_list)) { - int lru; - page = lru_to_page(&page_list); - VM_BUG_ON(PageLRU(page)); - list_del(&page->lru); - if (unlikely(!page_evictable(page, NULL))) { - spin_unlock_irq(&zone->lru_lock); - putback_lru_page(page); - spin_lock_irq(&zone->lru_lock); - continue; - } - SetPageLRU(page); - lru = page_lru(page); - add_page_to_lru_list(zone, page, lru); - if (is_active_lru(lru)) { - int file = is_file_lru(lru); - reclaim_stat->recent_rotated[file]++; - } - if (!pagevec_add(&pvec, page)) { - spin_unlock_irq(&zone->lru_lock); - __pagevec_release(&pvec); - spin_lock_irq(&zone->lru_lock); - } + spin_lock(&zone->lru_lock); + /* + * Put back any unfreeable pages. + */ + while (!list_empty(&page_list)) { + int lru; + page = lru_to_page(&page_list); + VM_BUG_ON(PageLRU(page)); + list_del(&page->lru); + if (unlikely(!page_evictable(page, NULL))) { + spin_unlock_irq(&zone->lru_lock); + putback_lru_page(page); + spin_lock_irq(&zone->lru_lock); + continue; } - __mod_zone_page_state(zone, NR_ISOLATED_ANON, -nr_anon); - __mod_zone_page_state(zone, NR_ISOLATED_FILE, -nr_file); - - } while (nr_scanned < max_scan); + SetPageLRU(page); + lru = page_lru(page); + add_page_to_lru_list(zone, page, lru); + if (is_active_lru(lru)) { + int file = is_file_lru(lru); + reclaim_stat->recent_rotated[file]++; + } + if (!pagevec_add(&pvec, page)) { + spin_unlock_irq(&zone->lru_lock); + __pagevec_release(&pvec); + spin_lock_irq(&zone->lru_lock); + } + } + __mod_zone_page_state(zone, NR_ISOLATED_ANON, -nr_anon); + __mod_zone_page_state(zone, NR_ISOLATED_FILE, -nr_file); done: spin_unlock_irq(&zone->lru_lock); -- 1.6.5.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/