Initial import

1 files changed, 641 insertions, 0 deletions

diff --git a/mm/slob.c b/mm/slob.c
new file mode 100644
index 000000000..4765f6501
--- /dev/null
+++ b/mm/slob.c
@@ -0,0 +1,641 @@
+/*
+ * SLOB Allocator: Simple List Of Blocks
+ *
+ * Matt Mackall <mpm@selenic.com> 12/30/03
+ *
+ * NUMA support by Paul Mundt, 2007.
+ *
+ * How SLOB works:
+ *
+ * The core of SLOB is a traditional K&R style heap allocator, with
+ * support for returning aligned objects. The granularity of this
+ * allocator is as little as 2 bytes, however typically most architectures
+ * will require 4 bytes on 32-bit and 8 bytes on 64-bit.
+ *
+ * The slob heap is a set of linked list of pages from alloc_pages(),
+ * and within each page, there is a singly-linked list of free blocks
+ * (slob_t). The heap is grown on demand. To reduce fragmentation,
+ * heap pages are segregated into three lists, with objects less than
+ * 256 bytes, objects less than 1024 bytes, and all other objects.
+ *
+ * Allocation from heap involves first searching for a page with
+ * sufficient free blocks (using a next-fit-like approach) followed by
+ * a first-fit scan of the page. Deallocation inserts objects back
+ * into the free list in address order, so this is effectively an
+ * address-ordered first fit.
+ *
+ * Above this is an implementation of kmalloc/kfree. Blocks returned
+ * from kmalloc are prepended with a 4-byte header with the kmalloc size.
+ * If kmalloc is asked for objects of PAGE_SIZE or larger, it calls
+ * alloc_pages() directly, allocating compound pages so the page order
+ * does not have to be separately tracked.
+ * These objects are detected in kfree() because PageSlab()
+ * is false for them.
+ *
+ * SLAB is emulated on top of SLOB by simply calling constructors and
+ * destructors for every SLAB allocation. Objects are returned with the
+ * 4-byte alignment unless the SLAB_HWCACHE_ALIGN flag is set, in which
+ * case the low-level allocator will fragment blocks to create the proper
+ * alignment. Again, objects of page-size or greater are allocated by
+ * calling alloc_pages(). As SLAB objects know their size, no separate
+ * size bookkeeping is necessary and there is essentially no allocation
+ * space overhead, and compound pages aren't needed for multi-page
+ * allocations.
+ *
+ * NUMA support in SLOB is fairly simplistic, pushing most of the real
+ * logic down to the page allocator, and simply doing the node accounting
+ * on the upper levels. In the event that a node id is explicitly
+ * provided, alloc_pages_exact_node() with the specified node id is used
+ * instead. The common case (or when the node id isn't explicitly provided)
+ * will default to the current node, as per numa_node_id().
+ *
+ * Node aware pages are still inserted in to the global freelist, and
+ * these are scanned for by matching against the node id encoded in the
+ * page flags. As a result, block allocations that can be satisfied from
+ * the freelist will only be done so on pages residing on the same node,
+ * in order to prevent random node placement.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+
+#include <linux/mm.h>
+#include <linux/swap.h> /* struct reclaim_state */
+#include <linux/cache.h>
+#include <linux/init.h>
+#include <linux/export.h>
+#include <linux/rcupdate.h>
+#include <linux/list.h>
+#include <linux/kmemleak.h>
+
+#include <trace/events/kmem.h>
+
+#include <linux/atomic.h>
+
+#include "slab.h"
+/*
+ * slob_block has a field 'units', which indicates size of block if +ve,
+ * or offset of next block if -ve (in SLOB_UNITs).
+ *
+ * Free blocks of size 1 unit simply contain the offset of the next block.
+ * Those with larger size contain their size in the first SLOB_UNIT of
+ * memory, and the offset of the next free block in the second SLOB_UNIT.
+ */
+#if PAGE_SIZE <= (32767 * 2)
+typedef s16 slobidx_t;
+#else
+typedef s32 slobidx_t;
+#endif
+
+struct slob_block {
+	slobidx_t units;
+};
+typedef struct slob_block slob_t;
+
+/*
+ * All partially free slob pages go on these lists.
+ */
+#define SLOB_BREAK1 256
+#define SLOB_BREAK2 1024
+static LIST_HEAD(free_slob_small);
+static LIST_HEAD(free_slob_medium);
+static LIST_HEAD(free_slob_large);
+
+/*
+ * slob_page_free: true for pages on free_slob_pages list.
+ */
+static inline int slob_page_free(struct page *sp)
+{
+	return PageSlobFree(sp);
+}
+
+static void set_slob_page_free(struct page *sp, struct list_head *list)
+{
+	list_add(&sp->lru, list);
+	__SetPageSlobFree(sp);
+}
+
+static inline void clear_slob_page_free(struct page *sp)
+{
+	list_del(&sp->lru);
+	__ClearPageSlobFree(sp);
+}
+
+#define SLOB_UNIT sizeof(slob_t)
+#define SLOB_UNITS(size) DIV_ROUND_UP(size, SLOB_UNIT)
+
+/*
+ * struct slob_rcu is inserted at the tail of allocated slob blocks, which
+ * were created with a SLAB_DESTROY_BY_RCU slab. slob_rcu is used to free
+ * the block using call_rcu.
+ */
+struct slob_rcu {
+	struct rcu_head head;
+	int size;
+};
+
+/*
+ * slob_lock protects all slob allocator structures.
+ */
+static DEFINE_SPINLOCK(slob_lock);
+
+/*
+ * Encode the given size and next info into a free slob block s.
+ */
+static void set_slob(slob_t *s, slobidx_t size, slob_t *next)
+{
+	slob_t *base = (slob_t *)((unsigned long)s & PAGE_MASK);
+	slobidx_t offset = next - base;
+
+	if (size > 1) {
+		s[0].units = size;
+		s[1].units = offset;
+	} else
+		s[0].units = -offset;
+}
+
+/*
+ * Return the size of a slob block.
+ */
+static slobidx_t slob_units(slob_t *s)
+{
+	if (s->units > 0)
+		return s->units;
+	return 1;
+}
+
+/*
+ * Return the next free slob block pointer after this one.
+ */
+static slob_t *slob_next(slob_t *s)
+{
+	slob_t *base = (slob_t *)((unsigned long)s & PAGE_MASK);
+	slobidx_t next;
+
+	if (s[0].units < 0)
+		next = -s[0].units;
+	else
+		next = s[1].units;
+	return base+next;
+}
+
+/*
+ * Returns true if s is the last free block in its page.
+ */
+static int slob_last(slob_t *s)
+{
+	return !((unsigned long)slob_next(s) & ~PAGE_MASK);
+}
+
+static void *slob_new_pages(gfp_t gfp, int order, int node)
+{
+	void *page;
+
+#ifdef CONFIG_NUMA
+	if (node != NUMA_NO_NODE)
+		page = alloc_pages_exact_node(node, gfp, order);
+	else
+#endif
+		page = alloc_pages(gfp, order);
+
+	if (!page)
+		return NULL;
+
+	return page_address(page);
+}
+
+static void slob_free_pages(void *b, int order)
+{
+	if (current->reclaim_state)
+		current->reclaim_state->reclaimed_slab += 1 << order;
+	free_pages((unsigned long)b, order);
+}
+
+/*
+ * Allocate a slob block within a given slob_page sp.
+ */
+static void *slob_page_alloc(struct page *sp, size_t size, int align)
+{
+	slob_t *prev, *cur, *aligned = NULL;
+	int delta = 0, units = SLOB_UNITS(size);
+
+	for (prev = NULL, cur = sp->freelist; ; prev = cur, cur = slob_next(cur)) {
+		slobidx_t avail = slob_units(cur);
+
+		if (align) {
+			aligned = (slob_t *)ALIGN((unsigned long)cur, align);
+			delta = aligned - cur;
+		}
+		if (avail >= units + delta) { /* room enough? */
+			slob_t *next;
+
+			if (delta) { /* need to fragment head to align? */
+				next = slob_next(cur);
+				set_slob(aligned, avail - delta, next);
+				set_slob(cur, delta, aligned);
+				prev = cur;
+				cur = aligned;
+				avail = slob_units(cur);
+			}
+
+			next = slob_next(cur);
+			if (avail == units) { /* exact fit? unlink. */
+				if (prev)
+					set_slob(prev, slob_units(prev), next);
+				else
+					sp->freelist = next;
+			} else { /* fragment */
+				if (prev)
+					set_slob(prev, slob_units(prev), cur + units);
+				else
+					sp->freelist = cur + units;
+				set_slob(cur + units, avail - units, next);
+			}
+
+			sp->units -= units;
+			if (!sp->units)
+				clear_slob_page_free(sp);
+			return cur;
+		}
+		if (slob_last(cur))
+			return NULL;
+	}
+}
+
+/*
+ * slob_alloc: entry point into the slob allocator.
+ */
+static void *slob_alloc(size_t size, gfp_t gfp, int align, int node)
+{
+	struct page *sp;
+	struct list_head *prev;
+	struct list_head *slob_list;
+	slob_t *b = NULL;
+	unsigned long flags;
+
+	if (size < SLOB_BREAK1)
+		slob_list = &free_slob_small;
+	else if (size < SLOB_BREAK2)
+		slob_list = &free_slob_medium;
+	else
+		slob_list = &free_slob_large;
+
+	spin_lock_irqsave(&slob_lock, flags);
+	/* Iterate through each partially free page, try to find room */
+	list_for_each_entry(sp, slob_list, lru) {
+#ifdef CONFIG_NUMA
+		/*
+		 * If there's a node specification, search for a partial
+		 * page with a matching node id in the freelist.
+		 */
+		if (node != NUMA_NO_NODE && page_to_nid(sp) != node)
+			continue;
+#endif
+		/* Enough room on this page? */
+		if (sp->units < SLOB_UNITS(size))
+			continue;
+
+		/* Attempt to alloc */
+		prev = sp->lru.prev;
+		b = slob_page_alloc(sp, size, align);
+		if (!b)
+			continue;
+
+		/* Improve fragment distribution and reduce our average
+		 * search time by starting our next search here. (see
+		 * Knuth vol 1, sec 2.5, pg 449) */
+		if (prev != slob_list->prev &&
+				slob_list->next != prev->next)
+			list_move_tail(slob_list, prev->next);
+		break;
+	}
+	spin_unlock_irqrestore(&slob_lock, flags);
+
+	/* Not enough space: must allocate a new page */
+	if (!b) {
+		b = slob_new_pages(gfp & ~__GFP_ZERO, 0, node);
+		if (!b)
+			return NULL;
+		sp = virt_to_page(b);
+		__SetPageSlab(sp);
+
+		spin_lock_irqsave(&slob_lock, flags);
+		sp->units = SLOB_UNITS(PAGE_SIZE);
+		sp->freelist = b;
+		INIT_LIST_HEAD(&sp->lru);
+		set_slob(b, SLOB_UNITS(PAGE_SIZE), b + SLOB_UNITS(PAGE_SIZE));
+		set_slob_page_free(sp, slob_list);
+		b = slob_page_alloc(sp, size, align);
+		BUG_ON(!b);
+		spin_unlock_irqrestore(&slob_lock, flags);
+	}
+	if (unlikely((gfp & __GFP_ZERO) && b))
+		memset(b, 0, size);
+	return b;
+}
+
+/*
+ * slob_free: entry point into the slob allocator.
+ */
+static void slob_free(void *block, int size)
+{
+	struct page *sp;
+	slob_t *prev, *next, *b = (slob_t *)block;
+	slobidx_t units;
+	unsigned long flags;
+	struct list_head *slob_list;
+
+	if (unlikely(ZERO_OR_NULL_PTR(block)))
+		return;
+	BUG_ON(!size);
+
+	sp = virt_to_page(block);
+	units = SLOB_UNITS(size);
+
+	spin_lock_irqsave(&slob_lock, flags);
+
+	if (sp->units + units == SLOB_UNITS(PAGE_SIZE)) {
+		/* Go directly to page allocator. Do not pass slob allocator */
+		if (slob_page_free(sp))
+			clear_slob_page_free(sp);
+		spin_unlock_irqrestore(&slob_lock, flags);
+		__ClearPageSlab(sp);
+		page_mapcount_reset(sp);
+		slob_free_pages(b, 0);
+		return;
+	}
+
+	if (!slob_page_free(sp)) {
+		/* This slob page is about to become partially free. Easy! */
+		sp->units = units;
+		sp->freelist = b;
+		set_slob(b, units,
+			(void *)((unsigned long)(b +
+					SLOB_UNITS(PAGE_SIZE)) & PAGE_MASK));
+		if (size < SLOB_BREAK1)
+			slob_list = &free_slob_small;
+		else if (size < SLOB_BREAK2)
+			slob_list = &free_slob_medium;
+		else
+			slob_list = &free_slob_large;
+		set_slob_page_free(sp, slob_list);
+		goto out;
+	}
+
+	/*
+	 * Otherwise the page is already partially free, so find reinsertion
+	 * point.
+	 */
+	sp->units += units;
+
+	if (b < (slob_t *)sp->freelist) {
+		if (b + units == sp->freelist) {
+			units += slob_units(sp->freelist);
+			sp->freelist = slob_next(sp->freelist);
+		}
+		set_slob(b, units, sp->freelist);
+		sp->freelist = b;
+	} else {
+		prev = sp->freelist;
+		next = slob_next(prev);
+		while (b > next) {
+			prev = next;
+			next = slob_next(prev);
+		}
+
+		if (!slob_last(prev) && b + units == next) {
+			units += slob_units(next);
+			set_slob(b, units, slob_next(next));
+		} else
+			set_slob(b, units, next);
+
+		if (prev + slob_units(prev) == b) {
+			units = slob_units(b) + slob_units(prev);
+			set_slob(prev, units, slob_next(b));
+		} else
+			set_slob(prev, slob_units(prev), b);
+	}
+out:
+	spin_unlock_irqrestore(&slob_lock, flags);
+}
+
+/*
+ * End of slob allocator proper. Begin kmem_cache_alloc and kmalloc frontend.
+ */
+
+static __always_inline void *
+__do_kmalloc_node(size_t size, gfp_t gfp, int node, unsigned long caller)
+{
+	unsigned int *m;
+	int align = max_t(size_t, ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN);
+	void *ret;
+
+	gfp &= gfp_allowed_mask;
+
+	lockdep_trace_alloc(gfp);
+
+	if (size < PAGE_SIZE - align) {
+		if (!size)
+			return ZERO_SIZE_PTR;
+
+		m = slob_alloc(size + align, gfp, align, node);
+
+		if (!m)
+			return NULL;
+		*m = size;
+		ret = (void *)m + align;
+
+		trace_kmalloc_node(caller, ret,
+				   size, size + align, gfp, node);
+	} else {
+		unsigned int order = get_order(size);
+
+		if (likely(order))
+			gfp |= __GFP_COMP;
+		ret = slob_new_pages(gfp, order, node);
+
+		trace_kmalloc_node(caller, ret,
+				   size, PAGE_SIZE << order, gfp, node);
+	}
+
+	kmemleak_alloc(ret, size, 1, gfp);
+	return ret;
+}
+
+void *__kmalloc(size_t size, gfp_t gfp)
+{
+	return __do_kmalloc_node(size, gfp, NUMA_NO_NODE, _RET_IP_);
+}
+EXPORT_SYMBOL(__kmalloc);
+
+void *__kmalloc_track_caller(size_t size, gfp_t gfp, unsigned long caller)
+{
+	return __do_kmalloc_node(size, gfp, NUMA_NO_NODE, caller);
+}
+
+#ifdef CONFIG_NUMA
+void *__kmalloc_node_track_caller(size_t size, gfp_t gfp,
+					int node, unsigned long caller)
+{
+	return __do_kmalloc_node(size, gfp, node, caller);
+}
+#endif
+
+void kfree(const void *block)
+{
+	struct page *sp;
+
+	trace_kfree(_RET_IP_, block);
+
+	if (unlikely(ZERO_OR_NULL_PTR(block)))
+		return;
+	kmemleak_free(block);
+
+	sp = virt_to_page(block);
+	if (PageSlab(sp)) {
+		int align = max_t(size_t, ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN);
+		unsigned int *m = (unsigned int *)(block - align);
+		slob_free(m, *m + align);
+	} else
+		__free_pages(sp, compound_order(sp));
+}
+EXPORT_SYMBOL(kfree);
+
+/* can't use ksize for kmem_cache_alloc memory, only kmalloc */
+size_t ksize(const void *block)
+{
+	struct page *sp;
+	int align;
+	unsigned int *m;
+
+	BUG_ON(!block);
+	if (unlikely(block == ZERO_SIZE_PTR))
+		return 0;
+
+	sp = virt_to_page(block);
+	if (unlikely(!PageSlab(sp)))
+		return PAGE_SIZE << compound_order(sp);
+
+	align = max_t(size_t, ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN);
+	m = (unsigned int *)(block - align);
+	return SLOB_UNITS(*m) * SLOB_UNIT;
+}
+EXPORT_SYMBOL(ksize);
+
+int __kmem_cache_create(struct kmem_cache *c, unsigned long flags)
+{
+	if (flags & SLAB_DESTROY_BY_RCU) {
+		/* leave room for rcu footer at the end of object */
+		c->size += sizeof(struct slob_rcu);
+	}
+	c->flags = flags;
+	return 0;
+}
+
+static void *slob_alloc_node(struct kmem_cache *c, gfp_t flags, int node)
+{
+	void *b;
+
+	flags &= gfp_allowed_mask;
+
+	lockdep_trace_alloc(flags);
+
+	if (c->size < PAGE_SIZE) {
+		b = slob_alloc(c->size, flags, c->align, node);
+		trace_kmem_cache_alloc_node(_RET_IP_, b, c->object_size,
+					    SLOB_UNITS(c->size) * SLOB_UNIT,
+					    flags, node);
+	} else {
+		b = slob_new_pages(flags, get_order(c->size), node);
+		trace_kmem_cache_alloc_node(_RET_IP_, b, c->object_size,
+					    PAGE_SIZE << get_order(c->size),
+					    flags, node);
+	}
+
+	if (b && c->ctor)
+		c->ctor(b);
+
+	kmemleak_alloc_recursive(b, c->size, 1, c->flags, flags);
+	return b;
+}
+
+void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags)
+{
+	return slob_alloc_node(cachep, flags, NUMA_NO_NODE);
+}
+EXPORT_SYMBOL(kmem_cache_alloc);
+
+#ifdef CONFIG_NUMA
+void *__kmalloc_node(size_t size, gfp_t gfp, int node)
+{
+	return __do_kmalloc_node(size, gfp, node, _RET_IP_);
+}
+EXPORT_SYMBOL(__kmalloc_node);
+
+void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t gfp, int node)
+{
+	return slob_alloc_node(cachep, gfp, node);
+}
+EXPORT_SYMBOL(kmem_cache_alloc_node);
+#endif
+
+static void __kmem_cache_free(void *b, int size)
+{
+	if (size < PAGE_SIZE)
+		slob_free(b, size);
+	else
+		slob_free_pages(b, get_order(size));
+}
+
+static void kmem_rcu_free(struct rcu_head *head)
+{
+	struct slob_rcu *slob_rcu = (struct slob_rcu *)head;
+	void *b = (void *)slob_rcu - (slob_rcu->size - sizeof(struct slob_rcu));
+
+	__kmem_cache_free(b, slob_rcu->size);
+}
+
+void kmem_cache_free(struct kmem_cache *c, void *b)
+{
+	kmemleak_free_recursive(b, c->flags);
+	if (unlikely(c->flags & SLAB_DESTROY_BY_RCU)) {
+		struct slob_rcu *slob_rcu;
+		slob_rcu = b + (c->size - sizeof(struct slob_rcu));
+		slob_rcu->size = c->size;
+		call_rcu(&slob_rcu->head, kmem_rcu_free);
+	} else {
+		__kmem_cache_free(b, c->size);
+	}
+
+	trace_kmem_cache_free(_RET_IP_, b);
+}
+EXPORT_SYMBOL(kmem_cache_free);
+
+int __kmem_cache_shutdown(struct kmem_cache *c)
+{
+	/* No way to check for remaining objects */
+	return 0;
+}
+
+int __kmem_cache_shrink(struct kmem_cache *d, bool deactivate)
+{
+	return 0;
+}
+
+struct kmem_cache kmem_cache_boot = {
+	.name = "kmem_cache",
+	.size = sizeof(struct kmem_cache),
+	.flags = SLAB_PANIC,
+	.align = ARCH_KMALLOC_MINALIGN,
+};
+
+void __init kmem_cache_init(void)
+{
+	kmem_cache = &kmem_cache_boot;
+	slab_state = UP;
+}
+
+void __init kmem_cache_init_late(void)
+{
+	slab_state = FULL;
+}