diff options
| -rw-r--r-- | include/linux/mmzone.h | 3 | ||||
| -rw-r--r-- | include/linux/pageblock-flags.h | 19 | ||||
| -rw-r--r-- | mm/compaction.c | 125 | ||||
| -rw-r--r-- | mm/internal.h | 4 | ||||
| -rw-r--r-- | mm/page_alloc.c | 38 |
5 files changed, 151 insertions, 38 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 16a4cc2950a..f85ecc9cfa1 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -369,6 +369,9 @@ struct zone { */ spinlock_t lock; int all_unreclaimable; /* All pages pinned */ +#if defined CONFIG_COMPACTION || defined CONFIG_CMA + unsigned long compact_blockskip_expire; +#endif #ifdef CONFIG_MEMORY_HOTPLUG /* see spanned/present_pages for more description */ seqlock_t span_seqlock; diff --git a/include/linux/pageblock-flags.h b/include/linux/pageblock-flags.h index 19ef95d293a..eed27f4f4c3 100644 --- a/include/linux/pageblock-flags.h +++ b/include/linux/pageblock-flags.h @@ -30,6 +30,9 @@ enum pageblock_bits { PB_migrate, PB_migrate_end = PB_migrate + 3 - 1, /* 3 bits required for migrate types */ +#ifdef CONFIG_COMPACTION + PB_migrate_skip,/* If set the block is skipped by compaction */ +#endif /* CONFIG_COMPACTION */ NR_PAGEBLOCK_BITS }; @@ -65,10 +68,22 @@ unsigned long get_pageblock_flags_group(struct page *page, void set_pageblock_flags_group(struct page *page, unsigned long flags, int start_bitidx, int end_bitidx); +#ifdef CONFIG_COMPACTION +#define get_pageblock_skip(page) \ + get_pageblock_flags_group(page, PB_migrate_skip, \ + PB_migrate_skip + 1) +#define clear_pageblock_skip(page) \ + set_pageblock_flags_group(page, 0, PB_migrate_skip, \ + PB_migrate_skip + 1) +#define set_pageblock_skip(page) \ + set_pageblock_flags_group(page, 1, PB_migrate_skip, \ + PB_migrate_skip + 1) +#endif /* CONFIG_COMPACTION */ + #define get_pageblock_flags(page) \ - get_pageblock_flags_group(page, 0, NR_PAGEBLOCK_BITS-1) + get_pageblock_flags_group(page, 0, PB_migrate_end) #define set_pageblock_flags(page, flags) \ set_pageblock_flags_group(page, flags, \ - 0, NR_PAGEBLOCK_BITS-1) + 0, PB_migrate_end) #endif /* PAGEBLOCK_FLAGS_H */ diff --git a/mm/compaction.c b/mm/compaction.c index db76361a311..d9dbb97e607 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -50,6 +50,79 @@ static inline bool migrate_async_suitable(int migratetype) return is_migrate_cma(migratetype) || migratetype == MIGRATE_MOVABLE; } +#ifdef CONFIG_COMPACTION +/* Returns true if the pageblock should be scanned for pages to isolate. */ +static inline bool isolation_suitable(struct compact_control *cc, + struct page *page) +{ + if (cc->ignore_skip_hint) + return true; + + return !get_pageblock_skip(page); +} + +/* + * This function is called to clear all cached information on pageblocks that + * should be skipped for page isolation when the migrate and free page scanner + * meet. + */ +static void reset_isolation_suitable(struct zone *zone) +{ + unsigned long start_pfn = zone->zone_start_pfn; + unsigned long end_pfn = zone->zone_start_pfn + zone->spanned_pages; + unsigned long pfn; + + /* + * Do not reset more than once every five seconds. If allocations are + * failing sufficiently quickly to allow this to happen then continually + * scanning for compaction is not going to help. The choice of five + * seconds is arbitrary but will mitigate excessive scanning. + */ + if (time_before(jiffies, zone->compact_blockskip_expire)) + return; + zone->compact_blockskip_expire = jiffies + (HZ * 5); + + /* Walk the zone and mark every pageblock as suitable for isolation */ + for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) { + struct page *page; + + cond_resched(); + + if (!pfn_valid(pfn)) + continue; + + page = pfn_to_page(pfn); + if (zone != page_zone(page)) + continue; + + clear_pageblock_skip(page); + } +} + +/* + * If no pages were isolated then mark this pageblock to be skipped in the + * future. The information is later cleared by reset_isolation_suitable(). + */ +static void update_pageblock_skip(struct page *page, unsigned long nr_isolated) +{ + if (!page) + return; + + if (!nr_isolated) + set_pageblock_skip(page); +} +#else +static inline bool isolation_suitable(struct compact_control *cc, + struct page *page) +{ + return true; +} + +static void update_pageblock_skip(struct page *page, unsigned long nr_isolated) +{ +} +#endif /* CONFIG_COMPACTION */ + static inline bool should_release_lock(spinlock_t *lock) { return need_resched() || spin_is_contended(lock); @@ -181,7 +254,7 @@ static unsigned long isolate_freepages_block(struct compact_control *cc, bool strict) { int nr_scanned = 0, total_isolated = 0; - struct page *cursor; + struct page *cursor, *valid_page = NULL; unsigned long nr_strict_required = end_pfn - blockpfn; unsigned long flags; bool locked = false; @@ -196,6 +269,8 @@ static unsigned long isolate_freepages_block(struct compact_control *cc, nr_scanned++; if (!pfn_valid_within(blockpfn)) continue; + if (!valid_page) + valid_page = page; if (!PageBuddy(page)) continue; @@ -250,6 +325,10 @@ static unsigned long isolate_freepages_block(struct compact_control *cc, if (locked) spin_unlock_irqrestore(&cc->zone->lock, flags); + /* Update the pageblock-skip if the whole pageblock was scanned */ + if (blockpfn == end_pfn) + update_pageblock_skip(valid_page, total_isolated); + return total_isolated; } @@ -267,22 +346,14 @@ static unsigned long isolate_freepages_block(struct compact_control *cc, * a free page). */ unsigned long -isolate_freepages_range(unsigned long start_pfn, unsigned long end_pfn) +isolate_freepages_range(struct compact_control *cc, + unsigned long start_pfn, unsigned long end_pfn) { unsigned long isolated, pfn, block_end_pfn; - struct zone *zone = NULL; LIST_HEAD(freelist); - /* cc needed for isolate_freepages_block to acquire zone->lock */ - struct compact_control cc = { - .sync = true, - }; - - if (pfn_valid(start_pfn)) - cc.zone = zone = page_zone(pfn_to_page(start_pfn)); - for (pfn = start_pfn; pfn < end_pfn; pfn += isolated) { - if (!pfn_valid(pfn) || zone != page_zone(pfn_to_page(pfn))) + if (!pfn_valid(pfn) || cc->zone != page_zone(pfn_to_page(pfn))) break; /* @@ -292,7 +363,7 @@ isolate_freepages_range(unsigned long start_pfn, unsigned long end_pfn) block_end_pfn = ALIGN(pfn + 1, pageblock_nr_pages); block_end_pfn = min(block_end_pfn, end_pfn); - isolated = isolate_freepages_block(&cc, pfn, block_end_pfn, + isolated = isolate_freepages_block(cc, pfn, block_end_pfn, &freelist, true); /* @@ -387,6 +458,7 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc, struct lruvec *lruvec; unsigned long flags; bool locked = false; + struct page *page = NULL, *valid_page = NULL; /* * Ensure that there are not too many pages isolated from the LRU @@ -407,8 +479,6 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc, /* Time to isolate some pages for migration */ cond_resched(); for (; low_pfn < end_pfn; low_pfn++) { - struct page *page; - /* give a chance to irqs before checking need_resched() */ if (locked && !((low_pfn+1) % SWAP_CLUSTER_MAX)) { if (should_release_lock(&zone->lru_lock)) { @@ -444,6 +514,14 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc, if (page_zone(page) != zone) continue; + if (!valid_page) + valid_page = page; + + /* If isolation recently failed, do not retry */ + pageblock_nr = low_pfn >> pageblock_order; + if (!isolation_suitable(cc, page)) + goto next_pageblock; + /* Skip if free */ if (PageBuddy(page)) continue; @@ -453,7 +531,6 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc, * migration is optimistic to see if the minimum amount of work * satisfies the allocation */ - pageblock_nr = low_pfn >> pageblock_order; if (!cc->sync && last_pageblock_nr != pageblock_nr && !migrate_async_suitable(get_pageblock_migratetype(page))) { goto next_pageblock; @@ -530,6 +607,10 @@ next_pageblock: if (locked) spin_unlock_irqrestore(&zone->lru_lock, flags); + /* Update the pageblock-skip if the whole pageblock was scanned */ + if (low_pfn == end_pfn) + update_pageblock_skip(valid_page, nr_isolated); + trace_mm_compaction_isolate_migratepages(nr_scanned, nr_isolated); return low_pfn; @@ -593,6 +674,10 @@ static void isolate_freepages(struct zone *zone, if (!suitable_migration_target(page)) continue; + /* If isolation recently failed, do not retry */ + if (!isolation_suitable(cc, page)) + continue; + /* Found a block suitable for isolating free pages from */ isolated = 0; end_pfn = min(pfn + pageblock_nr_pages, zone_end_pfn); @@ -709,8 +794,10 @@ static int compact_finished(struct zone *zone, return COMPACT_PARTIAL; /* Compaction run completes if the migrate and free scanner meet */ - if (cc->free_pfn <= cc->migrate_pfn) + if (cc->free_pfn <= cc->migrate_pfn) { + reset_isolation_suitable(cc->zone); return COMPACT_COMPLETE; + } /* * order == -1 is expected when compacting via @@ -818,6 +905,10 @@ static int compact_zone(struct zone *zone, struct compact_control *cc) cc->free_pfn = cc->migrate_pfn + zone->spanned_pages; cc->free_pfn &= ~(pageblock_nr_pages-1); + /* Clear pageblock skip if there are numerous alloc failures */ + if (zone->compact_defer_shift == COMPACT_MAX_DEFER_SHIFT) + reset_isolation_suitable(zone); + migrate_prep_local(); while ((ret = compact_finished(zone, cc)) == COMPACT_CONTINUE) { diff --git a/mm/internal.h b/mm/internal.h index 6f6bb9ab938..7ba56ac360b 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -120,6 +120,7 @@ struct compact_control { unsigned long free_pfn; /* isolate_freepages search base */ unsigned long migrate_pfn; /* isolate_migratepages search base */ bool sync; /* Synchronous migration */ + bool ignore_skip_hint; /* Scan blocks even if marked skip */ int order; /* order a direct compactor needs */ int migratetype; /* MOVABLE, RECLAIMABLE etc */ @@ -129,7 +130,8 @@ struct compact_control { }; unsigned long -isolate_freepages_range(unsigned long start_pfn, unsigned long end_pfn); +isolate_freepages_range(struct compact_control *cc, + unsigned long start_pfn, unsigned long end_pfn); unsigned long isolate_migratepages_range(struct zone *zone, struct compact_control *cc, unsigned long low_pfn, unsigned long end_pfn); diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 628968c1ccf..44c56049edf 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5679,7 +5679,8 @@ __alloc_contig_migrate_alloc(struct page *page, unsigned long private, } /* [start, end) must belong to a single zone. */ -static int __alloc_contig_migrate_range(unsigned long start, unsigned long end) +static int __alloc_contig_migrate_range(struct compact_control *cc, + unsigned long start, unsigned long end) { /* This function is based on compact_zone() from compaction.c. */ @@ -5687,25 +5688,17 @@ static int __alloc_contig_migrate_range(unsigned long start, unsigned long end) unsigned int tries = 0; int ret = 0; - struct compact_control cc = { - .nr_migratepages = 0, - .order = -1, - .zone = page_zone(pfn_to_page(start)), - .sync = true, - }; - INIT_LIST_HEAD(&cc.migratepages); - migrate_prep_local(); - while (pfn < end || !list_empty(&cc.migratepages)) { + while (pfn < end || !list_empty(&cc->migratepages)) { if (fatal_signal_pending(current)) { ret = -EINTR; break; } - if (list_empty(&cc.migratepages)) { - cc.nr_migratepages = 0; - pfn = isolate_migratepages_range(cc.zone, &cc, + if (list_empty(&cc->migratepages)) { + cc->nr_migratepages = 0; + pfn = isolate_migratepages_range(cc->zone, cc, pfn, end); if (!pfn) { ret = -EINTR; @@ -5717,14 +5710,14 @@ static int __alloc_contig_migrate_range(unsigned long start, unsigned long end) break; } - reclaim_clean_pages_from_list(cc.zone, &cc.migratepages); + reclaim_clean_pages_from_list(cc->zone, &cc->migratepages); - ret = migrate_pages(&cc.migratepages, + ret = migrate_pages(&cc->migratepages, __alloc_contig_migrate_alloc, 0, false, MIGRATE_SYNC); } - putback_lru_pages(&cc.migratepages); + putback_lru_pages(&cc->migratepages); return ret > 0 ? 0 : ret; } @@ -5803,6 +5796,15 @@ int alloc_contig_range(unsigned long start, unsigned long end, unsigned long outer_start, outer_end; int ret = 0, order; + struct compact_control cc = { + .nr_migratepages = 0, + .order = -1, + .zone = page_zone(pfn_to_page(start)), + .sync = true, + .ignore_skip_hint = true, + }; + INIT_LIST_HEAD(&cc.migratepages); + /* * What we do here is we mark all pageblocks in range as * MIGRATE_ISOLATE. Because pageblock and max order pages may @@ -5832,7 +5834,7 @@ int alloc_contig_range(unsigned long start, unsigned long end, if (ret) goto done; - ret = __alloc_contig_migrate_range(start, end); + ret = __alloc_contig_migrate_range(&cc, start, end); if (ret) goto done; @@ -5881,7 +5883,7 @@ int alloc_contig_range(unsigned long start, unsigned long end, __reclaim_pages(zone, GFP_HIGHUSER_MOVABLE, end-start); /* Grab isolated pages from freelists. */ - outer_end = isolate_freepages_range(outer_start, end); + outer_end = isolate_freepages_range(&cc, outer_start, end); if (!outer_end) { ret = -EBUSY; goto done; |