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author | 2014-10-09 15:28:17 -0700 | |
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committer | 2014-10-09 22:25:57 -0400 | |
commit | 5705465174686d007473e017b76c4b64b44aa690 (patch) | |
tree | 09d197b925802f7b2b7d96129046eb0d15da60dc | |
parent | mm/page-writeback.c: use min3/max3 macros to avoid shadow warnings (diff) | |
download | linux-5705465174686d007473e017b76c4b64b44aa690.tar.gz linux-5705465174686d007473e017b76c4b64b44aa690.tar.bz2 linux-5705465174686d007473e017b76c4b64b44aa690.zip |
mm: clean up zone flags
Page reclaim tests zone_is_reclaim_dirty(), but the site that actually
sets this state does zone_set_flag(zone, ZONE_TAIL_LRU_DIRTY), sending the
reader through layers indirection just to track down a simple bit.
Remove all zone flag wrappers and just use bitops against zone->flags
directly. It's just as readable and the lines are barely any longer.
Also rename ZONE_TAIL_LRU_DIRTY to ZONE_DIRTY to match ZONE_WRITEBACK, and
remove the zone_flags_t typedef.
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r-- | include/linux/mmzone.h | 51 | ||||
-rw-r--r-- | mm/backing-dev.c | 2 | ||||
-rw-r--r-- | mm/oom_kill.c | 6 | ||||
-rw-r--r-- | mm/page_alloc.c | 8 | ||||
-rw-r--r-- | mm/vmscan.c | 28 |
5 files changed, 25 insertions, 70 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 318df7051850..48bf12ef6620 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -521,13 +521,13 @@ struct zone { atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; } ____cacheline_internodealigned_in_smp; -typedef enum { +enum zone_flags { ZONE_RECLAIM_LOCKED, /* prevents concurrent reclaim */ ZONE_OOM_LOCKED, /* zone is in OOM killer zonelist */ ZONE_CONGESTED, /* zone has many dirty pages backed by * a congested BDI */ - ZONE_TAIL_LRU_DIRTY, /* reclaim scanning has recently found + ZONE_DIRTY, /* reclaim scanning has recently found * many dirty file pages at the tail * of the LRU. */ @@ -535,52 +535,7 @@ typedef enum { * many pages under writeback */ ZONE_FAIR_DEPLETED, /* fair zone policy batch depleted */ -} zone_flags_t; - -static inline void zone_set_flag(struct zone *zone, zone_flags_t flag) -{ - set_bit(flag, &zone->flags); -} - -static inline int zone_test_and_set_flag(struct zone *zone, zone_flags_t flag) -{ - return test_and_set_bit(flag, &zone->flags); -} - -static inline void zone_clear_flag(struct zone *zone, zone_flags_t flag) -{ - clear_bit(flag, &zone->flags); -} - -static inline int zone_is_reclaim_congested(const struct zone *zone) -{ - return test_bit(ZONE_CONGESTED, &zone->flags); -} - -static inline int zone_is_reclaim_dirty(const struct zone *zone) -{ - return test_bit(ZONE_TAIL_LRU_DIRTY, &zone->flags); -} - -static inline int zone_is_reclaim_writeback(const struct zone *zone) -{ - return test_bit(ZONE_WRITEBACK, &zone->flags); -} - -static inline int zone_is_reclaim_locked(const struct zone *zone) -{ - return test_bit(ZONE_RECLAIM_LOCKED, &zone->flags); -} - -static inline int zone_is_fair_depleted(const struct zone *zone) -{ - return test_bit(ZONE_FAIR_DEPLETED, &zone->flags); -} - -static inline int zone_is_oom_locked(const struct zone *zone) -{ - return test_bit(ZONE_OOM_LOCKED, &zone->flags); -} +}; static inline unsigned long zone_end_pfn(const struct zone *zone) { diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 1706cbbdf5f0..b27714f1b40f 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -631,7 +631,7 @@ long wait_iff_congested(struct zone *zone, int sync, long timeout) * of sleeping on the congestion queue */ if (atomic_read(&nr_bdi_congested[sync]) == 0 || - !zone_is_reclaim_congested(zone)) { + !test_bit(ZONE_CONGESTED, &zone->flags)) { cond_resched(); /* In case we scheduled, work out time remaining */ diff --git a/mm/oom_kill.c b/mm/oom_kill.c index 1e11df8fa7ec..bbf405a3a18f 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -565,7 +565,7 @@ bool oom_zonelist_trylock(struct zonelist *zonelist, gfp_t gfp_mask) spin_lock(&zone_scan_lock); for_each_zone_zonelist(zone, z, zonelist, gfp_zone(gfp_mask)) - if (zone_is_oom_locked(zone)) { + if (test_bit(ZONE_OOM_LOCKED, &zone->flags)) { ret = false; goto out; } @@ -575,7 +575,7 @@ bool oom_zonelist_trylock(struct zonelist *zonelist, gfp_t gfp_mask) * call to oom_zonelist_trylock() doesn't succeed when it shouldn't. */ for_each_zone_zonelist(zone, z, zonelist, gfp_zone(gfp_mask)) - zone_set_flag(zone, ZONE_OOM_LOCKED); + set_bit(ZONE_OOM_LOCKED, &zone->flags); out: spin_unlock(&zone_scan_lock); @@ -594,7 +594,7 @@ void oom_zonelist_unlock(struct zonelist *zonelist, gfp_t gfp_mask) spin_lock(&zone_scan_lock); for_each_zone_zonelist(zone, z, zonelist, gfp_zone(gfp_mask)) - zone_clear_flag(zone, ZONE_OOM_LOCKED); + clear_bit(ZONE_OOM_LOCKED, &zone->flags); spin_unlock(&zone_scan_lock); } diff --git a/mm/page_alloc.c b/mm/page_alloc.c index ae2f8474273c..f3769f0fce3c 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1614,8 +1614,8 @@ again: __mod_zone_page_state(zone, NR_ALLOC_BATCH, -(1 << order)); if (atomic_long_read(&zone->vm_stat[NR_ALLOC_BATCH]) <= 0 && - !zone_is_fair_depleted(zone)) - zone_set_flag(zone, ZONE_FAIR_DEPLETED); + !test_bit(ZONE_FAIR_DEPLETED, &zone->flags)) + set_bit(ZONE_FAIR_DEPLETED, &zone->flags); __count_zone_vm_events(PGALLOC, zone, 1 << order); zone_statistics(preferred_zone, zone, gfp_flags); @@ -1935,7 +1935,7 @@ static void reset_alloc_batches(struct zone *preferred_zone) mod_zone_page_state(zone, NR_ALLOC_BATCH, high_wmark_pages(zone) - low_wmark_pages(zone) - atomic_long_read(&zone->vm_stat[NR_ALLOC_BATCH])); - zone_clear_flag(zone, ZONE_FAIR_DEPLETED); + clear_bit(ZONE_FAIR_DEPLETED, &zone->flags); } while (zone++ != preferred_zone); } @@ -1986,7 +1986,7 @@ zonelist_scan: if (alloc_flags & ALLOC_FAIR) { if (!zone_local(preferred_zone, zone)) break; - if (zone_is_fair_depleted(zone)) { + if (test_bit(ZONE_FAIR_DEPLETED, &zone->flags)) { nr_fair_skipped++; continue; } diff --git a/mm/vmscan.c b/mm/vmscan.c index af72fe8e8d74..06123f20a326 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -920,7 +920,7 @@ static unsigned long shrink_page_list(struct list_head *page_list, /* Case 1 above */ if (current_is_kswapd() && PageReclaim(page) && - zone_is_reclaim_writeback(zone)) { + test_bit(ZONE_WRITEBACK, &zone->flags)) { nr_immediate++; goto keep_locked; @@ -1002,7 +1002,7 @@ static unsigned long shrink_page_list(struct list_head *page_list, */ if (page_is_file_cache(page) && (!current_is_kswapd() || - !zone_is_reclaim_dirty(zone))) { + !test_bit(ZONE_DIRTY, &zone->flags))) { /* * Immediately reclaim when written back. * Similar in principal to deactivate_page() @@ -1563,7 +1563,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec, * are encountered in the nr_immediate check below. */ if (nr_writeback && nr_writeback == nr_taken) - zone_set_flag(zone, ZONE_WRITEBACK); + set_bit(ZONE_WRITEBACK, &zone->flags); /* * memcg will stall in page writeback so only consider forcibly @@ -1575,16 +1575,16 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec, * backed by a congested BDI and wait_iff_congested will stall. */ if (nr_dirty && nr_dirty == nr_congested) - zone_set_flag(zone, ZONE_CONGESTED); + set_bit(ZONE_CONGESTED, &zone->flags); /* * If dirty pages are scanned that are not queued for IO, it * implies that flushers are not keeping up. In this case, flag - * the zone ZONE_TAIL_LRU_DIRTY and kswapd will start writing - * pages from reclaim context. + * the zone ZONE_DIRTY and kswapd will start writing pages from + * reclaim context. */ if (nr_unqueued_dirty == nr_taken) - zone_set_flag(zone, ZONE_TAIL_LRU_DIRTY); + set_bit(ZONE_DIRTY, &zone->flags); /* * If kswapd scans pages marked marked for immediate @@ -2984,7 +2984,7 @@ static bool kswapd_shrink_zone(struct zone *zone, /* Account for the number of pages attempted to reclaim */ *nr_attempted += sc->nr_to_reclaim; - zone_clear_flag(zone, ZONE_WRITEBACK); + clear_bit(ZONE_WRITEBACK, &zone->flags); /* * If a zone reaches its high watermark, consider it to be no longer @@ -2994,8 +2994,8 @@ static bool kswapd_shrink_zone(struct zone *zone, */ if (zone_reclaimable(zone) && zone_balanced(zone, testorder, 0, classzone_idx)) { - zone_clear_flag(zone, ZONE_CONGESTED); - zone_clear_flag(zone, ZONE_TAIL_LRU_DIRTY); + clear_bit(ZONE_CONGESTED, &zone->flags); + clear_bit(ZONE_DIRTY, &zone->flags); } return sc->nr_scanned >= sc->nr_to_reclaim; @@ -3086,8 +3086,8 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order, * If balanced, clear the dirty and congested * flags */ - zone_clear_flag(zone, ZONE_CONGESTED); - zone_clear_flag(zone, ZONE_TAIL_LRU_DIRTY); + clear_bit(ZONE_CONGESTED, &zone->flags); + clear_bit(ZONE_DIRTY, &zone->flags); } } @@ -3714,11 +3714,11 @@ int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order) if (node_state(node_id, N_CPU) && node_id != numa_node_id()) return ZONE_RECLAIM_NOSCAN; - if (zone_test_and_set_flag(zone, ZONE_RECLAIM_LOCKED)) + if (test_and_set_bit(ZONE_RECLAIM_LOCKED, &zone->flags)) return ZONE_RECLAIM_NOSCAN; ret = __zone_reclaim(zone, gfp_mask, order); - zone_clear_flag(zone, ZONE_RECLAIM_LOCKED); + clear_bit(ZONE_RECLAIM_LOCKED, &zone->flags); if (!ret) count_vm_event(PGSCAN_ZONE_RECLAIM_FAILED); |