diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/filemap.c | 86 | ||||
| -rw-r--r-- | mm/memcontrol.c | 4 | ||||
| -rw-r--r-- | mm/page_alloc.c | 44 | ||||
| -rw-r--r-- | mm/slub.c | 10 | ||||
| -rw-r--r-- | mm/swapfile.c | 3 | ||||
| -rw-r--r-- | mm/truncate.c | 40 |
6 files changed, 136 insertions, 51 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index c3811bc..79c4b2b 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -813,20 +813,19 @@ EXPORT_SYMBOL(find_or_create_page); unsigned find_get_pages(struct address_space *mapping, pgoff_t start, unsigned int nr_pages, struct page **pages) { - unsigned int i; - unsigned int ret; - unsigned int nr_found, nr_skip; + struct radix_tree_iter iter; + void **slot; + unsigned ret = 0; + + if (unlikely(!nr_pages)) + return 0; rcu_read_lock(); restart: - nr_found = radix_tree_gang_lookup_slot(&mapping->page_tree, - (void ***)pages, NULL, start, nr_pages); - ret = 0; - nr_skip = 0; - for (i = 0; i < nr_found; i++) { + radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, start) { struct page *page; repeat: - page = radix_tree_deref_slot((void **)pages[i]); + page = radix_tree_deref_slot(slot); if (unlikely(!page)) continue; @@ -837,7 +836,7 @@ repeat: * when entry at index 0 moves out of or back * to root: none yet gotten, safe to restart. */ - WARN_ON(start | i); + WARN_ON(iter.index); goto restart; } /* @@ -845,7 +844,6 @@ repeat: * here as an exceptional entry: so skip over it - * we only reach this from invalidate_mapping_pages(). */ - nr_skip++; continue; } @@ -853,21 +851,16 @@ repeat: goto repeat; /* Has the page moved? */ - if (unlikely(page != *((void **)pages[i]))) { + if (unlikely(page != *slot)) { page_cache_release(page); goto repeat; } pages[ret] = page; - ret++; + if (++ret == nr_pages) + break; } - /* - * If all entries were removed before we could secure them, - * try again, because callers stop trying once 0 is returned. - */ - if (unlikely(!ret && nr_found > nr_skip)) - goto restart; rcu_read_unlock(); return ret; } @@ -887,21 +880,22 @@ repeat: unsigned find_get_pages_contig(struct address_space *mapping, pgoff_t index, unsigned int nr_pages, struct page **pages) { - unsigned int i; - unsigned int ret; - unsigned int nr_found; + struct radix_tree_iter iter; + void **slot; + unsigned int ret = 0; + + if (unlikely(!nr_pages)) + return 0; rcu_read_lock(); restart: - nr_found = radix_tree_gang_lookup_slot(&mapping->page_tree, - (void ***)pages, NULL, index, nr_pages); - ret = 0; - for (i = 0; i < nr_found; i++) { + radix_tree_for_each_contig(slot, &mapping->page_tree, &iter, index) { struct page *page; repeat: - page = radix_tree_deref_slot((void **)pages[i]); + page = radix_tree_deref_slot(slot); + /* The hole, there no reason to continue */ if (unlikely(!page)) - continue; + break; if (radix_tree_exception(page)) { if (radix_tree_deref_retry(page)) { @@ -924,7 +918,7 @@ repeat: goto repeat; /* Has the page moved? */ - if (unlikely(page != *((void **)pages[i]))) { + if (unlikely(page != *slot)) { page_cache_release(page); goto repeat; } @@ -934,14 +928,14 @@ repeat: * otherwise we can get both false positives and false * negatives, which is just confusing to the caller. */ - if (page->mapping == NULL || page->index != index) { + if (page->mapping == NULL || page->index != iter.index) { page_cache_release(page); break; } pages[ret] = page; - ret++; - index++; + if (++ret == nr_pages) + break; } rcu_read_unlock(); return ret; @@ -962,19 +956,20 @@ EXPORT_SYMBOL(find_get_pages_contig); unsigned find_get_pages_tag(struct address_space *mapping, pgoff_t *index, int tag, unsigned int nr_pages, struct page **pages) { - unsigned int i; - unsigned int ret; - unsigned int nr_found; + struct radix_tree_iter iter; + void **slot; + unsigned ret = 0; + + if (unlikely(!nr_pages)) + return 0; rcu_read_lock(); restart: - nr_found = radix_tree_gang_lookup_tag_slot(&mapping->page_tree, - (void ***)pages, *index, nr_pages, tag); - ret = 0; - for (i = 0; i < nr_found; i++) { + radix_tree_for_each_tagged(slot, &mapping->page_tree, + &iter, *index, tag) { struct page *page; repeat: - page = radix_tree_deref_slot((void **)pages[i]); + page = radix_tree_deref_slot(slot); if (unlikely(!page)) continue; @@ -998,21 +993,16 @@ repeat: goto repeat; /* Has the page moved? */ - if (unlikely(page != *((void **)pages[i]))) { + if (unlikely(page != *slot)) { page_cache_release(page); goto repeat; } pages[ret] = page; - ret++; + if (++ret == nr_pages) + break; } - /* - * If all entries were removed before we could secure them, - * try again, because callers stop trying once 0 is returned. - */ - if (unlikely(!ret && nr_found)) - goto restart; rcu_read_unlock(); if (ret) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index b2ee6df..7d698df 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -5306,6 +5306,8 @@ static int mem_cgroup_count_precharge_pte_range(pmd_t *pmd, return 0; } + if (pmd_trans_unstable(pmd)) + return 0; pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); for (; addr != end; pte++, addr += PAGE_SIZE) if (get_mctgt_type(vma, addr, *pte, NULL)) @@ -5502,6 +5504,8 @@ static int mem_cgroup_move_charge_pte_range(pmd_t *pmd, return 0; } + if (pmd_trans_unstable(pmd)) + return 0; retry: pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); for (; addr != end; addr += PAGE_SIZE) { diff --git a/mm/page_alloc.c b/mm/page_alloc.c index caea788..a712fb9 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1161,11 +1161,47 @@ void drain_local_pages(void *arg) } /* - * Spill all the per-cpu pages from all CPUs back into the buddy allocator + * Spill all the per-cpu pages from all CPUs back into the buddy allocator. + * + * Note that this code is protected against sending an IPI to an offline + * CPU but does not guarantee sending an IPI to newly hotplugged CPUs: + * on_each_cpu_mask() blocks hotplug and won't talk to offlined CPUs but + * nothing keeps CPUs from showing up after we populated the cpumask and + * before the call to on_each_cpu_mask(). */ void drain_all_pages(void) { - on_each_cpu(drain_local_pages, NULL, 1); + int cpu; + struct per_cpu_pageset *pcp; + struct zone *zone; + + /* + * Allocate in the BSS so we wont require allocation in + * direct reclaim path for CONFIG_CPUMASK_OFFSTACK=y + */ + static cpumask_t cpus_with_pcps; + + /* + * We don't care about racing with CPU hotplug event + * as offline notification will cause the notified + * cpu to drain that CPU pcps and on_each_cpu_mask + * disables preemption as part of its processing + */ + for_each_online_cpu(cpu) { + bool has_pcps = false; + for_each_populated_zone(zone) { + pcp = per_cpu_ptr(zone->pageset, cpu); + if (pcp->pcp.count) { + has_pcps = true; + break; + } + } + if (has_pcps) + cpumask_set_cpu(cpu, &cpus_with_pcps); + else + cpumask_clear_cpu(cpu, &cpus_with_pcps); + } + on_each_cpu_mask(&cpus_with_pcps, drain_local_pages, NULL, 1); } #ifdef CONFIG_HIBERNATION @@ -2308,6 +2344,10 @@ rebalance: if ((gfp_mask & __GFP_FS) && !(gfp_mask & __GFP_NORETRY)) { if (oom_killer_disabled) goto nopage; + /* Coredumps can quickly deplete all memory reserves */ + if ((current->flags & PF_DUMPCORE) && + !(gfp_mask & __GFP_NOFAIL)) + goto nopage; page = __alloc_pages_may_oom(gfp_mask, order, zonelist, high_zoneidx, nodemask, preferred_zone, @@ -2035,9 +2035,17 @@ static void flush_cpu_slab(void *d) __flush_cpu_slab(s, smp_processor_id()); } +static bool has_cpu_slab(int cpu, void *info) +{ + struct kmem_cache *s = info; + struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu); + + return !!(c->page); +} + static void flush_all(struct kmem_cache *s) { - on_each_cpu(flush_cpu_slab, s, 1); + on_each_cpu_cond(has_cpu_slab, flush_cpu_slab, s, 1, GFP_ATOMIC); } /* diff --git a/mm/swapfile.c b/mm/swapfile.c index dae42f3..fafc26d 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -2022,6 +2022,9 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) struct page *page = NULL; struct inode *inode = NULL; + if (swap_flags & ~SWAP_FLAGS_VALID) + return -EINVAL; + if (!capable(CAP_SYS_ADMIN)) return -EPERM; diff --git a/mm/truncate.c b/mm/truncate.c index 18aded3..61a183b 100644 --- a/mm/truncate.c +++ b/mm/truncate.c @@ -626,3 +626,43 @@ int vmtruncate_range(struct inode *inode, loff_t lstart, loff_t lend) return 0; } + +/** + * truncate_pagecache_range - unmap and remove pagecache that is hole-punched + * @inode: inode + * @lstart: offset of beginning of hole + * @lend: offset of last byte of hole + * + * This function should typically be called before the filesystem + * releases resources associated with the freed range (eg. deallocates + * blocks). This way, pagecache will always stay logically coherent + * with on-disk format, and the filesystem would not have to deal with + * situations such as writepage being called for a page that has already + * had its underlying blocks deallocated. + */ +void truncate_pagecache_range(struct inode *inode, loff_t lstart, loff_t lend) +{ + struct address_space *mapping = inode->i_mapping; + loff_t unmap_start = round_up(lstart, PAGE_SIZE); + loff_t unmap_end = round_down(1 + lend, PAGE_SIZE) - 1; + /* + * This rounding is currently just for example: unmap_mapping_range + * expands its hole outwards, whereas we want it to contract the hole + * inwards. However, existing callers of truncate_pagecache_range are + * doing their own page rounding first; and truncate_inode_pages_range + * currently BUGs if lend is not pagealigned-1 (it handles partial + * page at start of hole, but not partial page at end of hole). Note + * unmap_mapping_range allows holelen 0 for all, and we allow lend -1. + */ + + /* + * Unlike in truncate_pagecache, unmap_mapping_range is called only + * once (before truncating pagecache), and without "even_cows" flag: + * hole-punching should not remove private COWed pages from the hole. + */ + if ((u64)unmap_end > (u64)unmap_start) + unmap_mapping_range(mapping, unmap_start, + 1 + unmap_end - unmap_start, 0); + truncate_inode_pages_range(mapping, lstart, lend); +} +EXPORT_SYMBOL(truncate_pagecache_range); |
