diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/Kconfig | 1 | ||||
| -rw-r--r-- | mm/filemap.c | 18 | ||||
| -rw-r--r-- | mm/memory_hotplug.c | 126 | ||||
| -rw-r--r-- | mm/page-writeback.c | 4 | ||||
| -rw-r--r-- | mm/page_alloc.c | 8 | ||||
| -rw-r--r-- | mm/slab.c | 21 | ||||
| -rw-r--r-- | mm/sparse.c | 2 | ||||
| -rw-r--r-- | mm/vmscan.c | 39 |
8 files changed, 175 insertions, 44 deletions
diff --git a/mm/Kconfig b/mm/Kconfig index 66e65ab3942..e76c023eb0b 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -116,6 +116,7 @@ config SPARSEMEM_EXTREME config MEMORY_HOTPLUG bool "Allow for memory hot-add" depends on SPARSEMEM && HOTPLUG && !SOFTWARE_SUSPEND + depends on (IA64 || X86 || PPC64) comment "Memory hotplug is currently incompatible with Software Suspend" depends on SPARSEMEM && HOTPLUG && SOFTWARE_SUSPEND diff --git a/mm/filemap.c b/mm/filemap.c index 9c7334bafda..d504d6e9888 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2095,14 +2095,21 @@ generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov, do { unsigned long index; unsigned long offset; - unsigned long maxlen; size_t copied; offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */ index = pos >> PAGE_CACHE_SHIFT; bytes = PAGE_CACHE_SIZE - offset; - if (bytes > count) - bytes = count; + + /* Limit the size of the copy to the caller's write size */ + bytes = min(bytes, count); + + /* + * Limit the size of the copy to that of the current segment, + * because fault_in_pages_readable() doesn't know how to walk + * segments. + */ + bytes = min(bytes, cur_iov->iov_len - iov_base); /* * Bring in the user page that we will copy from _first_. @@ -2110,10 +2117,7 @@ generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov, * same page as we're writing to, without it being marked * up-to-date. */ - maxlen = cur_iov->iov_len - iov_base; - if (maxlen > bytes) - maxlen = bytes; - fault_in_pages_readable(buf, maxlen); + fault_in_pages_readable(buf, bytes); page = __grab_cache_page(mapping,index,&cached_page,&lru_pvec); if (!page) { diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 841a077d5ae..ea4038838b0 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -21,6 +21,7 @@ #include <linux/memory_hotplug.h> #include <linux/highmem.h> #include <linux/vmalloc.h> +#include <linux/ioport.h> #include <asm/tlbflush.h> @@ -126,6 +127,9 @@ int online_pages(unsigned long pfn, unsigned long nr_pages) unsigned long i; unsigned long flags; unsigned long onlined_pages = 0; + struct resource res; + u64 section_end; + unsigned long start_pfn; struct zone *zone; int need_zonelists_rebuild = 0; @@ -148,10 +152,27 @@ int online_pages(unsigned long pfn, unsigned long nr_pages) if (!populated_zone(zone)) need_zonelists_rebuild = 1; - for (i = 0; i < nr_pages; i++) { - struct page *page = pfn_to_page(pfn + i); - online_page(page); - onlined_pages++; + res.start = (u64)pfn << PAGE_SHIFT; + res.end = res.start + ((u64)nr_pages << PAGE_SHIFT) - 1; + res.flags = IORESOURCE_MEM; /* we just need system ram */ + section_end = res.end; + + while (find_next_system_ram(&res) >= 0) { + start_pfn = (unsigned long)(res.start >> PAGE_SHIFT); + nr_pages = (unsigned long) + ((res.end + 1 - res.start) >> PAGE_SHIFT); + + if (PageReserved(pfn_to_page(start_pfn))) { + /* this region's page is not onlined now */ + for (i = 0; i < nr_pages; i++) { + struct page *page = pfn_to_page(start_pfn + i); + online_page(page); + onlined_pages++; + } + } + + res.start = res.end + 1; + res.end = section_end; } zone->present_pages += onlined_pages; zone->zone_pgdat->node_present_pages += onlined_pages; @@ -163,3 +184,100 @@ int online_pages(unsigned long pfn, unsigned long nr_pages) vm_total_pages = nr_free_pagecache_pages(); return 0; } + +static pg_data_t *hotadd_new_pgdat(int nid, u64 start) +{ + struct pglist_data *pgdat; + unsigned long zones_size[MAX_NR_ZONES] = {0}; + unsigned long zholes_size[MAX_NR_ZONES] = {0}; + unsigned long start_pfn = start >> PAGE_SHIFT; + + pgdat = arch_alloc_nodedata(nid); + if (!pgdat) + return NULL; + + arch_refresh_nodedata(nid, pgdat); + + /* we can use NODE_DATA(nid) from here */ + + /* init node's zones as empty zones, we don't have any present pages.*/ + free_area_init_node(nid, pgdat, zones_size, start_pfn, zholes_size); + + return pgdat; +} + +static void rollback_node_hotadd(int nid, pg_data_t *pgdat) +{ + arch_refresh_nodedata(nid, NULL); + arch_free_nodedata(pgdat); + return; +} + +/* add this memory to iomem resource */ +static void register_memory_resource(u64 start, u64 size) +{ + struct resource *res; + + res = kzalloc(sizeof(struct resource), GFP_KERNEL); + BUG_ON(!res); + + res->name = "System RAM"; + res->start = start; + res->end = start + size - 1; + res->flags = IORESOURCE_MEM; + if (request_resource(&iomem_resource, res) < 0) { + printk("System RAM resource %llx - %llx cannot be added\n", + (unsigned long long)res->start, (unsigned long long)res->end); + kfree(res); + } +} + + + +int add_memory(int nid, u64 start, u64 size) +{ + pg_data_t *pgdat = NULL; + int new_pgdat = 0; + int ret; + + if (!node_online(nid)) { + pgdat = hotadd_new_pgdat(nid, start); + if (!pgdat) + return -ENOMEM; + new_pgdat = 1; + ret = kswapd_run(nid); + if (ret) + goto error; + } + + /* call arch's memory hotadd */ + ret = arch_add_memory(nid, start, size); + + if (ret < 0) + goto error; + + /* we online node here. we can't roll back from here. */ + node_set_online(nid); + + if (new_pgdat) { + ret = register_one_node(nid); + /* + * If sysfs file of new node can't create, cpu on the node + * can't be hot-added. There is no rollback way now. + * So, check by BUG_ON() to catch it reluctantly.. + */ + BUG_ON(ret); + } + + /* register this memory as resource */ + register_memory_resource(start, size); + + return ret; +error: + /* rollback pgdat allocation and others */ + if (new_pgdat) + rollback_node_hotadd(nid, pgdat); + + return ret; +} +EXPORT_SYMBOL_GPL(add_memory); diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 8ccf6f1b147..4ec7026c7ba 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -516,14 +516,14 @@ static void set_ratelimit(void) ratelimit_pages = (4096 * 1024) / PAGE_CACHE_SIZE; } -static int +static int __cpuinit ratelimit_handler(struct notifier_block *self, unsigned long u, void *v) { set_ratelimit(); return 0; } -static struct notifier_block ratelimit_nb = { +static struct notifier_block __cpuinitdata ratelimit_nb = { .notifier_call = ratelimit_handler, .next = NULL, }; diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 9f86191bb63..084a2de7e52 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -446,8 +446,8 @@ static void __free_pages_ok(struct page *page, unsigned int order) arch_free_page(page, order); if (!PageHighMem(page)) - mutex_debug_check_no_locks_freed(page_address(page), - PAGE_SIZE<<order); + debug_check_no_locks_freed(page_address(page), + PAGE_SIZE<<order); for (i = 0 ; i < (1 << order) ; ++i) reserved += free_pages_check(page + i); @@ -2009,7 +2009,7 @@ static inline void free_zone_pagesets(int cpu) } } -static int pageset_cpuup_callback(struct notifier_block *nfb, +static int __cpuinit pageset_cpuup_callback(struct notifier_block *nfb, unsigned long action, void *hcpu) { @@ -2031,7 +2031,7 @@ static int pageset_cpuup_callback(struct notifier_block *nfb, return ret; } -static struct notifier_block pageset_notifier = +static struct notifier_block __cpuinitdata pageset_notifier = { &pageset_cpuup_callback, NULL, 0 }; void __init setup_per_cpu_pageset(void) diff --git a/mm/slab.c b/mm/slab.c index 98ac20bc0de..233e39d14ca 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -89,6 +89,7 @@ #include <linux/config.h> #include <linux/slab.h> #include <linux/mm.h> +#include <linux/poison.h> #include <linux/swap.h> #include <linux/cache.h> #include <linux/interrupt.h> @@ -106,6 +107,7 @@ #include <linux/nodemask.h> #include <linux/mempolicy.h> #include <linux/mutex.h> +#include <linux/rtmutex.h> #include <asm/uaccess.h> #include <asm/cacheflush.h> @@ -492,17 +494,6 @@ struct kmem_cache { #endif #if DEBUG -/* - * Magic nums for obj red zoning. - * Placed in the first word before and the first word after an obj. - */ -#define RED_INACTIVE 0x5A2CF071UL /* when obj is inactive */ -#define RED_ACTIVE 0x170FC2A5UL /* when obj is active */ - -/* ...and for poisoning */ -#define POISON_INUSE 0x5a /* for use-uninitialised poisoning */ -#define POISON_FREE 0x6b /* for use-after-free poisoning */ -#define POISON_END 0xa5 /* end-byte of poisoning */ /* * memory layout of objects: @@ -1083,7 +1074,7 @@ static inline int cache_free_alien(struct kmem_cache *cachep, void *objp) #endif -static int cpuup_callback(struct notifier_block *nfb, +static int __devinit cpuup_callback(struct notifier_block *nfb, unsigned long action, void *hcpu) { long cpu = (long)hcpu; @@ -1265,7 +1256,9 @@ bad: return NOTIFY_BAD; } -static struct notifier_block cpucache_notifier = { &cpuup_callback, NULL, 0 }; +static struct notifier_block __cpuinitdata cpucache_notifier = { + &cpuup_callback, NULL, 0 +}; /* * swap the static kmem_list3 with kmalloced memory @@ -3405,7 +3398,7 @@ void kfree(const void *objp) local_irq_save(flags); kfree_debugcheck(objp); c = virt_to_cache(objp); - mutex_debug_check_no_locks_freed(objp, obj_size(c)); + debug_check_no_locks_freed(objp, obj_size(c)); __cache_free(c, (void *)objp); local_irq_restore(flags); } diff --git a/mm/sparse.c b/mm/sparse.c index e0a3fe48aa3..c7a2b3a0e46 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -45,7 +45,7 @@ static struct mem_section *sparse_index_alloc(int nid) static int sparse_index_init(unsigned long section_nr, int nid) { - static spinlock_t index_init_lock = SPIN_LOCK_UNLOCKED; + static DEFINE_SPINLOCK(index_init_lock); unsigned long root = SECTION_NR_TO_ROOT(section_nr); struct mem_section *section; int ret = 0; diff --git a/mm/vmscan.c b/mm/vmscan.c index 72babac71de..eeacb0d695c 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -34,6 +34,7 @@ #include <linux/notifier.h> #include <linux/rwsem.h> #include <linux/delay.h> +#include <linux/kthread.h> #include <asm/tlbflush.h> #include <asm/div64.h> @@ -1223,7 +1224,6 @@ static int kswapd(void *p) }; cpumask_t cpumask; - daemonize("kswapd%d", pgdat->node_id); cpumask = node_to_cpumask(pgdat->node_id); if (!cpus_empty(cpumask)) set_cpus_allowed(tsk, cpumask); @@ -1450,7 +1450,7 @@ out: not required for correctness. So if the last cpu in a node goes away, we get changed to run anywhere: as the first one comes back, restore their cpu bindings. */ -static int cpu_callback(struct notifier_block *nfb, +static int __devinit cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu) { pg_data_t *pgdat; @@ -1468,20 +1468,35 @@ static int cpu_callback(struct notifier_block *nfb, } #endif /* CONFIG_HOTPLUG_CPU */ +/* + * This kswapd start function will be called by init and node-hot-add. + * On node-hot-add, kswapd will moved to proper cpus if cpus are hot-added. + */ +int kswapd_run(int nid) +{ + pg_data_t *pgdat = NODE_DATA(nid); + int ret = 0; + + if (pgdat->kswapd) + return 0; + + pgdat->kswapd = kthread_run(kswapd, pgdat, "kswapd%d", nid); + if (IS_ERR(pgdat->kswapd)) { + /* failure at boot is fatal */ + BUG_ON(system_state == SYSTEM_BOOTING); + printk("Failed to start kswapd on node %d\n",nid); + ret = -1; + } + return ret; +} + static int __init kswapd_init(void) { - pg_data_t *pgdat; + int nid; swap_setup(); - for_each_online_pgdat(pgdat) { - pid_t pid; - - pid = kernel_thread(kswapd, pgdat, CLONE_KERNEL); - BUG_ON(pid < 0); - read_lock(&tasklist_lock); - pgdat->kswapd = find_task_by_pid(pid); - read_unlock(&tasklist_lock); - } + for_each_online_node(nid) + kswapd_run(nid); hotcpu_notifier(cpu_callback, 0); return 0; } |