The patch titled ksm: memory hotremove migration only has been removed from the -mm tree. Its filename was ksm-memory-hotremove-migration-only.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/ ------------------------------------------------------ Subject: ksm: memory hotremove migration only From: Hugh Dickins <hugh.dickins@xxxxxxxxxxxxx> The previous patch enables page migration of ksm pages, but that soon gets into trouble: not surprising, since we're using the ksm page lock to lock operations on its stable_node, but page migration switches the page whose lock is to be used for that. Another layer of locking would fix it, but do we need that yet? Do we actually need page migration of ksm pages? Yes, memory hotremove needs to offline sections of memory: and since we stopped allocating ksm pages with GFP_HIGHUSER, they will tend to be GFP_HIGHUSER_MOVABLE candidates for migration. But KSM is currently unconscious of NUMA issues, happily merging pages from different NUMA nodes: at present the rule must be, not to use MADV_MERGEABLE where you care about NUMA. So no, NUMA page migration of ksm pages does not make sense yet. So, to complete support for ksm swapping we need to make hotremove safe. ksm_memory_callback() take ksm_thread_mutex when MEM_GOING_OFFLINE and release it when MEM_OFFLINE or MEM_CANCEL_OFFLINE. But if mapped pages are freed before migration reaches them, stable_nodes may be left still pointing to struct pages which have been removed from the system: the stable_node needs to identify a page by pfn rather than page pointer, then it can safely prune them when MEM_OFFLINE. And make NUMA migration skip PageKsm pages where it skips PageReserved. But it's only when we reach unmap_and_move() that the page lock is taken and we can be sure that raised pagecount has prevented a PageAnon from being upgraded: so add offlining arg to migrate_pages(), to migrate ksm page when offlining (has sufficient locking) but reject it otherwise. Signed-off-by: Hugh Dickins <hugh.dickins@xxxxxxxxxxxxx> Cc: Izik Eidus <ieidus@xxxxxxxxxx> Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx> Cc: Chris Wright <chrisw@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/migrate.h | 8 +-- mm/ksm.c | 84 ++++++++++++++++++++++++++++++++------ mm/memory_hotplug.c | 2 mm/mempolicy.c | 19 +++----- mm/migrate.c | 27 +++++++++--- 5 files changed, 103 insertions(+), 37 deletions(-) diff -puN include/linux/migrate.h~ksm-memory-hotremove-migration-only include/linux/migrate.h --- a/include/linux/migrate.h~ksm-memory-hotremove-migration-only +++ a/include/linux/migrate.h @@ -12,7 +12,8 @@ typedef struct page *new_page_t(struct p extern int putback_lru_pages(struct list_head *l); extern int migrate_page(struct address_space *, struct page *, struct page *); -extern int migrate_pages(struct list_head *l, new_page_t x, unsigned long); +extern int migrate_pages(struct list_head *l, new_page_t x, + unsigned long private, int offlining); extern int fail_migrate_page(struct address_space *, struct page *, struct page *); @@ -26,10 +27,7 @@ extern int migrate_vmas(struct mm_struct static inline int putback_lru_pages(struct list_head *l) { return 0; } static inline int migrate_pages(struct list_head *l, new_page_t x, - unsigned long private) { return -ENOSYS; } - -static inline int migrate_pages_to(struct list_head *pagelist, - struct vm_area_struct *vma, int dest) { return 0; } + unsigned long private, int offlining) { return -ENOSYS; } static inline int migrate_prep(void) { return -ENOSYS; } diff -puN mm/ksm.c~ksm-memory-hotremove-migration-only mm/ksm.c --- a/mm/ksm.c~ksm-memory-hotremove-migration-only +++ a/mm/ksm.c @@ -29,6 +29,7 @@ #include <linux/wait.h> #include <linux/slab.h> #include <linux/rbtree.h> +#include <linux/memory.h> #include <linux/mmu_notifier.h> #include <linux/swap.h> #include <linux/ksm.h> @@ -108,14 +109,14 @@ struct ksm_scan { /** * struct stable_node - node of the stable rbtree - * @page: pointer to struct page of the ksm page * @node: rb node of this ksm page in the stable tree * @hlist: hlist head of rmap_items using this ksm page + * @kpfn: page frame number of this ksm page */ struct stable_node { - struct page *page; struct rb_node node; struct hlist_head hlist; + unsigned long kpfn; }; /** @@ -515,7 +516,7 @@ static struct page *get_ksm_page(struct struct page *page; void *expected_mapping; - page = stable_node->page; + page = pfn_to_page(stable_node->kpfn); expected_mapping = (void *)stable_node + (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM); rcu_read_lock(); @@ -973,7 +974,7 @@ static struct page *try_to_merge_two_pag * This function returns the stable tree node of identical content if found, * NULL otherwise. */ -static struct stable_node *stable_tree_search(struct page *page) +static struct page *stable_tree_search(struct page *page) { struct rb_node *node = root_stable_tree.rb_node; struct stable_node *stable_node; @@ -981,7 +982,7 @@ static struct stable_node *stable_tree_s stable_node = page_stable_node(page); if (stable_node) { /* ksm page forked */ get_page(page); - return stable_node; + return page; } while (node) { @@ -1003,7 +1004,7 @@ static struct stable_node *stable_tree_s put_page(tree_page); node = node->rb_right; } else - return stable_node; + return tree_page; } return NULL; @@ -1059,7 +1060,7 @@ static struct stable_node *stable_tree_i INIT_HLIST_HEAD(&stable_node->hlist); - stable_node->page = kpage; + stable_node->kpfn = page_to_pfn(kpage); set_page_stable_node(kpage, stable_node); return stable_node; @@ -1170,9 +1171,8 @@ static void cmp_and_merge_page(struct pa remove_rmap_item_from_tree(rmap_item); /* We first start with searching the page inside the stable tree */ - stable_node = stable_tree_search(page); - if (stable_node) { - kpage = stable_node->page; + kpage = stable_tree_search(page); + if (kpage) { err = try_to_merge_with_ksm_page(rmap_item, page, kpage); if (!err) { /* @@ -1180,7 +1180,7 @@ static void cmp_and_merge_page(struct pa * add its rmap_item to the stable tree. */ lock_page(kpage); - stable_tree_append(rmap_item, stable_node); + stable_tree_append(rmap_item, page_stable_node(kpage)); unlock_page(kpage); } put_page(kpage); @@ -1715,12 +1715,63 @@ void ksm_migrate_page(struct page *newpa stable_node = page_stable_node(newpage); if (stable_node) { - VM_BUG_ON(stable_node->page != oldpage); - stable_node->page = newpage; + VM_BUG_ON(stable_node->kpfn != page_to_pfn(oldpage)); + stable_node->kpfn = page_to_pfn(newpage); } } #endif /* CONFIG_MIGRATION */ +#ifdef CONFIG_MEMORY_HOTREMOVE +static struct stable_node *ksm_check_stable_tree(unsigned long start_pfn, + unsigned long end_pfn) +{ + struct rb_node *node; + + for (node = rb_first(&root_stable_tree); node; node = rb_next(node)) { + struct stable_node *stable_node; + + stable_node = rb_entry(node, struct stable_node, node); + if (stable_node->kpfn >= start_pfn && + stable_node->kpfn < end_pfn) + return stable_node; + } + return NULL; +} + +static int ksm_memory_callback(struct notifier_block *self, + unsigned long action, void *arg) +{ + struct memory_notify *mn = arg; + struct stable_node *stable_node; + + switch (action) { + case MEM_GOING_OFFLINE: + /* + * Keep it very simple for now: just lock out ksmd and + * MADV_UNMERGEABLE while any memory is going offline. + */ + mutex_lock(&ksm_thread_mutex); + break; + + case MEM_OFFLINE: + /* + * Most of the work is done by page migration; but there might + * be a few stable_nodes left over, still pointing to struct + * pages which have been offlined: prune those from the tree. + */ + while ((stable_node = ksm_check_stable_tree(mn->start_pfn, + mn->start_pfn + mn->nr_pages)) != NULL) + remove_node_from_stable_tree(stable_node); + /* fallthrough */ + + case MEM_CANCEL_OFFLINE: + mutex_unlock(&ksm_thread_mutex); + break; + } + return NOTIFY_OK; +} +#endif /* CONFIG_MEMORY_HOTREMOVE */ + #ifdef CONFIG_SYSFS /* * This all compiles without CONFIG_SYSFS, but is a waste of space. @@ -1946,6 +1997,13 @@ static int __init ksm_init(void) #endif /* CONFIG_SYSFS */ +#ifdef CONFIG_MEMORY_HOTREMOVE + /* + * Choose a high priority since the callback takes ksm_thread_mutex: + * later callbacks could only be taking locks which nest within that. + */ + hotplug_memory_notifier(ksm_memory_callback, 100); +#endif return 0; out_free2: diff -puN mm/memory_hotplug.c~ksm-memory-hotremove-migration-only mm/memory_hotplug.c --- a/mm/memory_hotplug.c~ksm-memory-hotremove-migration-only +++ a/mm/memory_hotplug.c @@ -698,7 +698,7 @@ do_migrate_range(unsigned long start_pfn if (list_empty(&source)) goto out; /* this function returns # of failed pages */ - ret = migrate_pages(&source, hotremove_migrate_alloc, 0); + ret = migrate_pages(&source, hotremove_migrate_alloc, 0, 1); out: return ret; diff -puN mm/mempolicy.c~ksm-memory-hotremove-migration-only mm/mempolicy.c --- a/mm/mempolicy.c~ksm-memory-hotremove-migration-only +++ a/mm/mempolicy.c @@ -85,6 +85,7 @@ #include <linux/seq_file.h> #include <linux/proc_fs.h> #include <linux/migrate.h> +#include <linux/ksm.h> #include <linux/rmap.h> #include <linux/security.h> #include <linux/syscalls.h> @@ -413,17 +414,11 @@ static int check_pte_range(struct vm_are if (!page) continue; /* - * The check for PageReserved here is important to avoid - * handling zero pages and other pages that may have been - * marked special by the system. - * - * If the PageReserved would not be checked here then f.e. - * the location of the zero page could have an influence - * on MPOL_MF_STRICT, zero pages would be counted for - * the per node stats, and there would be useless attempts - * to put zero pages on the migration list. + * vm_normal_page() filters out zero pages, but there might + * still be PageReserved pages to skip, perhaps in a VDSO. + * And we cannot move PageKsm pages sensibly or safely yet. */ - if (PageReserved(page)) + if (PageReserved(page) || PageKsm(page)) continue; nid = page_to_nid(page); if (node_isset(nid, *nodes) == !!(flags & MPOL_MF_INVERT)) @@ -839,7 +834,7 @@ static int migrate_to_node(struct mm_str flags | MPOL_MF_DISCONTIG_OK, &pagelist); if (!list_empty(&pagelist)) - err = migrate_pages(&pagelist, new_node_page, dest); + err = migrate_pages(&pagelist, new_node_page, dest, 0); return err; } @@ -1056,7 +1051,7 @@ static long do_mbind(unsigned long start if (!list_empty(&pagelist)) nr_failed = migrate_pages(&pagelist, new_vma_page, - (unsigned long)vma); + (unsigned long)vma, 0); if (!err && nr_failed && (flags & MPOL_MF_STRICT)) err = -EIO; diff -puN mm/migrate.c~ksm-memory-hotremove-migration-only mm/migrate.c --- a/mm/migrate.c~ksm-memory-hotremove-migration-only +++ a/mm/migrate.c @@ -543,7 +543,7 @@ static int move_to_new_page(struct page * to the newly allocated page in newpage. */ static int unmap_and_move(new_page_t get_new_page, unsigned long private, - struct page *page, int force) + struct page *page, int force, int offlining) { int rc = 0; int *result = NULL; @@ -569,6 +569,20 @@ static int unmap_and_move(new_page_t get lock_page(page); } + /* + * Only memory hotplug's offline_pages() caller has locked out KSM, + * and can safely migrate a KSM page. The other cases have skipped + * PageKsm along with PageReserved - but it is only now when we have + * the page lock that we can be certain it will not go KSM beneath us + * (KSM will not upgrade a page from PageAnon to PageKsm when it sees + * its pagecount raised, but only here do we take the page lock which + * serializes that). + */ + if (PageKsm(page) && !offlining) { + rc = -EBUSY; + goto unlock; + } + /* charge against new page */ charge = mem_cgroup_prepare_migration(page, &mem); if (charge == -ENOMEM) { @@ -685,7 +699,7 @@ move_newpage: * Return: Number of pages not migrated or error code. */ int migrate_pages(struct list_head *from, - new_page_t get_new_page, unsigned long private) + new_page_t get_new_page, unsigned long private, int offlining) { int retry = 1; int nr_failed = 0; @@ -705,7 +719,7 @@ int migrate_pages(struct list_head *from cond_resched(); rc = unmap_and_move(get_new_page, private, - page, pass > 2); + page, pass > 2, offlining); switch(rc) { case -ENOMEM: @@ -801,7 +815,8 @@ static int do_move_page_to_node_array(st if (!page) goto set_status; - if (PageReserved(page)) /* Check for zero page */ + /* Use PageReserved to check for zero page */ + if (PageReserved(page) || PageKsm(page)) goto put_and_set; pp->page = page; @@ -838,7 +853,7 @@ set_status: err = 0; if (!list_empty(&pagelist)) err = migrate_pages(&pagelist, new_page_node, - (unsigned long)pm); + (unsigned long)pm, 0); up_read(&mm->mmap_sem); return err; @@ -959,7 +974,7 @@ static void do_pages_stat_array(struct m err = -ENOENT; /* Use PageReserved to check for zero page */ - if (!page || PageReserved(page)) + if (!page || PageReserved(page) || PageKsm(page)) goto set_status; err = page_to_nid(page); _ Patches currently in -mm which might be from hugh.dickins@xxxxxxxxxxxxx are origin.patch linux-next.patch vfs-fsstack-handle-32-bit-smp-preempt-large-files-in-fsstack_copy_inode_size.patch ksm-memory-hotremove-migration-only-fix.patch elf-kill-use_elf_core_dump.patch prio_tree-debugging-patch.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