The patch titled Subject: vmscan: handle isolated pages with lru lock released has been removed from the -mm tree. Its filename was mm-vmscan-handle-isolated-pages-with-lru-lock-released.patch This patch was dropped because it was merged into mainline or a subsystem tree The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ From: Hillf Danton <dhillf@xxxxxxxxx> Subject: vmscan: handle isolated pages with lru lock released When shrinking inactive lru list, isolated pages are queued on locally private list, so the lock-hold time could be reduced if pages are counted without lock protection. To achieve that, firstly updating reclaim stat is delayed until the putback stage, after reacquiring the lru lock. Secondly, operations related to vm and zone stats are now proteced with preemption disabled as they are per-cpu operations. Signed-off-by: Hillf Danton <dhillf@xxxxxxxxx> Acked-by: Hugh Dickins <hughd@xxxxxxxxxx> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/vmscan.c | 21 ++++++++++----------- 1 file changed, 10 insertions(+), 11 deletions(-) diff -puN mm/vmscan.c~mm-vmscan-handle-isolated-pages-with-lru-lock-released mm/vmscan.c --- a/mm/vmscan.c~mm-vmscan-handle-isolated-pages-with-lru-lock-released +++ a/mm/vmscan.c @@ -1413,7 +1413,6 @@ update_isolated_counts(struct mem_cgroup unsigned long *nr_anon, unsigned long *nr_file) { - struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz); struct zone *zone = mz->zone; unsigned int count[NR_LRU_LISTS] = { 0, }; unsigned long nr_active = 0; @@ -1434,6 +1433,7 @@ update_isolated_counts(struct mem_cgroup count[lru] += numpages; } + preempt_disable(); __count_vm_events(PGDEACTIVATE, nr_active); __mod_zone_page_state(zone, NR_ACTIVE_FILE, @@ -1448,8 +1448,9 @@ update_isolated_counts(struct mem_cgroup *nr_anon = count[LRU_ACTIVE_ANON] + count[LRU_INACTIVE_ANON]; *nr_file = count[LRU_ACTIVE_FILE] + count[LRU_INACTIVE_FILE]; - reclaim_stat->recent_scanned[0] += *nr_anon; - reclaim_stat->recent_scanned[1] += *nr_file; + __mod_zone_page_state(zone, NR_ISOLATED_ANON, *nr_anon); + __mod_zone_page_state(zone, NR_ISOLATED_FILE, *nr_file); + preempt_enable(); } /* @@ -1511,6 +1512,7 @@ shrink_inactive_list(unsigned long nr_to unsigned long nr_writeback = 0; isolate_mode_t isolate_mode = ISOLATE_INACTIVE; struct zone *zone = mz->zone; + struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz); while (unlikely(too_many_isolated(zone, file, sc))) { congestion_wait(BLK_RW_ASYNC, HZ/10); @@ -1544,19 +1546,13 @@ shrink_inactive_list(unsigned long nr_to __count_zone_vm_events(PGSCAN_DIRECT, zone, nr_scanned); } + spin_unlock_irq(&zone->lru_lock); - if (nr_taken == 0) { - spin_unlock_irq(&zone->lru_lock); + if (nr_taken == 0) return 0; - } update_isolated_counts(mz, &page_list, &nr_anon, &nr_file); - __mod_zone_page_state(zone, NR_ISOLATED_ANON, nr_anon); - __mod_zone_page_state(zone, NR_ISOLATED_FILE, nr_file); - - spin_unlock_irq(&zone->lru_lock); - nr_reclaimed = shrink_page_list(&page_list, mz, sc, priority, &nr_dirty, &nr_writeback); @@ -1569,6 +1565,9 @@ shrink_inactive_list(unsigned long nr_to spin_lock_irq(&zone->lru_lock); + reclaim_stat->recent_scanned[0] += nr_anon; + reclaim_stat->recent_scanned[1] += nr_file; + if (current_is_kswapd()) __count_vm_events(KSWAPD_STEAL, nr_reclaimed); __count_zone_vm_events(PGSTEAL, zone, nr_reclaimed); _ Patches currently in -mm which might be from dhillf@xxxxxxxxx are origin.patch mm-hugetlb-cleanup-duplicated-code-in-unmapping-vm-range.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html