aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
-rw-r--r--fs/proc/proc_misc.c4
-rw-r--r--include/linux/slab.h35
-rw-r--r--init/Kconfig13
-rw-r--r--mm/Makefile4
-rw-r--r--mm/slob.c385
5 files changed, 440 insertions, 1 deletions
diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index 5b6b0b6038a7..63bf6c00fa0c 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -323,6 +323,7 @@ static struct file_operations proc_modules_operations = {
};
#endif
+#ifdef CONFIG_SLAB
extern struct seq_operations slabinfo_op;
extern ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
static int slabinfo_open(struct inode *inode, struct file *file)
@@ -336,6 +337,7 @@ static struct file_operations proc_slabinfo_operations = {
.llseek = seq_lseek,
.release = seq_release,
};
+#endif
static int show_stat(struct seq_file *p, void *v)
{
@@ -600,7 +602,9 @@ void __init proc_misc_init(void)
create_seq_entry("partitions", 0, &proc_partitions_operations);
create_seq_entry("stat", 0, &proc_stat_operations);
create_seq_entry("interrupts", 0, &proc_interrupts_operations);
+#ifdef CONFIG_SLAB
create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
+#endif
create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
create_seq_entry("zoneinfo",S_IRUGO, &proc_zoneinfo_file_operations);
diff --git a/include/linux/slab.h b/include/linux/slab.h
index d1ea4051b996..1fb77a9cc148 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -53,6 +53,8 @@ typedef struct kmem_cache kmem_cache_t;
#define SLAB_CTOR_ATOMIC 0x002UL /* tell constructor it can't sleep */
#define SLAB_CTOR_VERIFY 0x004UL /* tell constructor it's a verify call */
+#ifndef CONFIG_SLOB
+
/* prototypes */
extern void __init kmem_cache_init(void);
@@ -134,6 +136,39 @@ static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
extern int FASTCALL(kmem_cache_reap(int));
extern int FASTCALL(kmem_ptr_validate(kmem_cache_t *cachep, void *ptr));
+#else /* CONFIG_SLOB */
+
+/* SLOB allocator routines */
+
+void kmem_cache_init(void);
+struct kmem_cache *kmem_find_general_cachep(size_t, gfp_t gfpflags);
+struct kmem_cache *kmem_cache_create(const char *c, size_t, size_t,
+ unsigned long,
+ void (*)(void *, struct kmem_cache *, unsigned long),
+ void (*)(void *, struct kmem_cache *, unsigned long));
+int kmem_cache_destroy(struct kmem_cache *c);
+void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags);
+void kmem_cache_free(struct kmem_cache *c, void *b);
+const char *kmem_cache_name(struct kmem_cache *);
+void *kmalloc(size_t size, gfp_t flags);
+void *kzalloc(size_t size, gfp_t flags);
+void kfree(const void *m);
+unsigned int ksize(const void *m);
+unsigned int kmem_cache_size(struct kmem_cache *c);
+
+static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
+{
+ return kzalloc(n * size, flags);
+}
+
+#define kmem_cache_shrink(d) (0)
+#define kmem_cache_reap(a)
+#define kmem_ptr_validate(a, b) (0)
+#define kmem_cache_alloc_node(c, f, n) kmem_cache_alloc(c, f)
+#define kmalloc_node(s, f, n) kmalloc(s, f)
+
+#endif /* CONFIG_SLOB */
+
/* System wide caches */
extern kmem_cache_t *vm_area_cachep;
extern kmem_cache_t *names_cachep;
diff --git a/init/Kconfig b/init/Kconfig
index ba42f3793a84..0c9932f9f06b 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -380,6 +380,15 @@ config CC_ALIGN_JUMPS
no dummy operations need be executed.
Zero means use compiler's default.
+config SLAB
+ default y
+ bool "Use full SLAB allocator" if EMBEDDED
+ help
+ Disabling this replaces the advanced SLAB allocator and
+ kmalloc support with the drastically simpler SLOB allocator.
+ SLOB is more space efficient but does not scale well and is
+ more susceptible to fragmentation.
+
endmenu # General setup
config TINY_SHMEM
@@ -391,6 +400,10 @@ config BASE_SMALL
default 0 if BASE_FULL
default 1 if !BASE_FULL
+config SLOB
+ default !SLAB
+ bool
+
menu "Loadable module support"
config MODULES
diff --git a/mm/Makefile b/mm/Makefile
index 74c85ddc9176..9aa03fa1dcc3 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -9,7 +9,7 @@ mmu-$(CONFIG_MMU) := fremap.o highmem.o madvise.o memory.o mincore.o \
obj-y := bootmem.o filemap.o mempool.o oom_kill.o fadvise.o \
page_alloc.o page-writeback.o pdflush.o \
- readahead.o slab.o swap.o truncate.o vmscan.o \
+ readahead.o swap.o truncate.o vmscan.o \
prio_tree.o util.o $(mmu-y)
obj-$(CONFIG_SWAP) += page_io.o swap_state.o swapfile.o thrash.o
@@ -18,5 +18,7 @@ obj-$(CONFIG_NUMA) += mempolicy.o
obj-$(CONFIG_SPARSEMEM) += sparse.o
obj-$(CONFIG_SHMEM) += shmem.o
obj-$(CONFIG_TINY_SHMEM) += tiny-shmem.o
+obj-$(CONFIG_SLOB) += slob.o
+obj-$(CONFIG_SLAB) += slab.o
obj-$(CONFIG_MEMORY_HOTPLUG) += memory_hotplug.o
obj-$(CONFIG_FS_XIP) += filemap_xip.o
diff --git a/mm/slob.c b/mm/slob.c
new file mode 100644
index 000000000000..1c240c4b71d9
--- /dev/null
+++ b/mm/slob.c
@@ -0,0 +1,385 @@
+/*
+ * SLOB Allocator: Simple List Of Blocks
+ *
+ * Matt Mackall <mpm@selenic.com> 12/30/03
+ *
+ * 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 8 bytes on x86, though it's perhaps possible to reduce
+ * this to 4 if it's deemed worth the effort. The slob heap is a
+ * singly-linked list of pages from __get_free_page, grown on demand
+ * and allocation from the heap is currently first-fit.
+ *
+ * Above this is an implementation of kmalloc/kfree. Blocks returned
+ * from kmalloc are 8-byte aligned and prepended with a 8-byte header.
+ * If kmalloc is asked for objects of PAGE_SIZE or larger, it calls
+ * __get_free_pages directly so that it can return page-aligned blocks
+ * and keeps a linked list of such pages and their orders. These
+ * objects are detected in kfree() by their page alignment.
+ *
+ * SLAB is emulated on top of SLOB by simply calling constructors and
+ * destructors for every SLAB allocation. Objects are returned with
+ * the 8-byte alignment unless the SLAB_MUST_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 __get_free_pages. As SLAB objects know
+ * their size, no separate size bookkeeping is necessary and there is
+ * essentially no allocation space overhead.
+ */
+
+#include <linux/config.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/cache.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/timer.h>
+
+struct slob_block {
+ int units;
+ struct slob_block *next;
+};
+typedef struct slob_block slob_t;
+
+#define SLOB_UNIT sizeof(slob_t)
+#define SLOB_UNITS(size) (((size) + SLOB_UNIT - 1)/SLOB_UNIT)
+#define SLOB_ALIGN L1_CACHE_BYTES
+
+struct bigblock {
+ int order;
+ void *pages;
+ struct bigblock *next;
+};
+typedef struct bigblock bigblock_t;
+
+static slob_t arena = { .next = &arena, .units = 1 };
+static slob_t *slobfree = &arena;
+static bigblock_t *bigblocks;
+static DEFINE_SPINLOCK(slob_lock);
+static DEFINE_SPINLOCK(block_lock);
+
+static void slob_free(void *b, int size);
+
+static void *slob_alloc(size_t size, gfp_t gfp, int align)
+{
+ slob_t *prev, *cur, *aligned = 0;
+ int delta = 0, units = SLOB_UNITS(size);
+ unsigned long flags;
+
+ spin_lock_irqsave(&slob_lock, flags);
+ prev = slobfree;
+ for (cur = prev->next; ; prev = cur, cur = cur->next) {
+ if (align) {
+ aligned = (slob_t *)ALIGN((unsigned long)cur, align);
+ delta = aligned - cur;
+ }
+ if (cur->units >= units + delta) { /* room enough? */
+ if (delta) { /* need to fragment head to align? */
+ aligned->units = cur->units - delta;
+ aligned->next = cur->next;
+ cur->next = aligned;
+ cur->units = delta;
+ prev = cur;
+ cur = aligned;
+ }
+
+ if (cur->units == units) /* exact fit? */
+ prev->next = cur->next; /* unlink */
+ else { /* fragment */
+ prev->next = cur + units;
+ prev->next->units = cur->units - units;
+ prev->next->next = cur->next;
+ cur->units = units;
+ }
+
+ slobfree = prev;
+ spin_unlock_irqrestore(&slob_lock, flags);
+ return cur;
+ }
+ if (cur == slobfree) {
+ spin_unlock_irqrestore(&slob_lock, flags);
+
+ if (size == PAGE_SIZE) /* trying to shrink arena? */
+ return 0;
+
+ cur = (slob_t *)__get_free_page(gfp);
+ if (!cur)
+ return 0;
+
+ slob_free(cur, PAGE_SIZE);
+ spin_lock_irqsave(&slob_lock, flags);
+ cur = slobfree;
+ }
+ }
+}
+
+static void slob_free(void *block, int size)
+{
+ slob_t *cur, *b = (slob_t *)block;
+ unsigned long flags;
+
+ if (!block)
+ return;
+
+ if (size)
+ b->units = SLOB_UNITS(size);
+
+ /* Find reinsertion point */
+ spin_lock_irqsave(&slob_lock, flags);
+ for (cur = slobfree; !(b > cur && b < cur->next); cur = cur->next)
+ if (cur >= cur->next && (b > cur || b < cur->next))
+ break;
+
+ if (b + b->units == cur->next) {
+ b->units += cur->next->units;
+ b->next = cur->next->next;
+ } else
+ b->next = cur->next;
+
+ if (cur + cur->units == b) {
+ cur->units += b->units;
+ cur->next = b->next;
+ } else
+ cur->next = b;
+
+ slobfree = cur;
+
+ spin_unlock_irqrestore(&slob_lock, flags);
+}
+
+static int FASTCALL(find_order(int size));
+static int fastcall find_order(int size)
+{
+ int order = 0;
+ for ( ; size > 4096 ; size >>=1)
+ order++;
+ return order;
+}
+
+void *kmalloc(size_t size, gfp_t gfp)
+{
+ slob_t *m;
+ bigblock_t *bb;
+ unsigned long flags;
+
+ if (size < PAGE_SIZE - SLOB_UNIT) {
+ m = slob_alloc(size + SLOB_UNIT, gfp, 0);
+ return m ? (void *)(m + 1) : 0;
+ }
+
+ bb = slob_alloc(sizeof(bigblock_t), gfp, 0);
+ if (!bb)
+ return 0;
+
+ bb->order = find_order(size);
+ bb->pages = (void *)__get_free_pages(gfp, bb->order);
+
+ if (bb->pages) {
+ spin_lock_irqsave(&block_lock, flags);
+ bb->next = bigblocks;
+ bigblocks = bb;
+ spin_unlock_irqrestore(&block_lock, flags);
+ return bb->pages;
+ }
+
+ slob_free(bb, sizeof(bigblock_t));
+ return 0;
+}
+
+EXPORT_SYMBOL(kmalloc);
+
+void kfree(const void *block)
+{
+ bigblock_t *bb, **last = &bigblocks;
+ unsigned long flags;
+
+ if (!block)
+ return;
+
+ if (!((unsigned long)block & (PAGE_SIZE-1))) {
+ /* might be on the big block list */
+ spin_lock_irqsave(&block_lock, flags);
+ for (bb = bigblocks; bb; last = &bb->next, bb = bb->next) {
+ if (bb->pages == block) {
+ *last = bb->next;
+ spin_unlock_irqrestore(&block_lock, flags);
+ free_pages((unsigned long)block, bb->order);
+ slob_free(bb, sizeof(bigblock_t));
+ return;
+ }
+ }
+ spin_unlock_irqrestore(&block_lock, flags);
+ }
+
+ slob_free((slob_t *)block - 1, 0);
+ return;
+}
+
+EXPORT_SYMBOL(kfree);
+
+unsigned int ksize(const void *block)
+{
+ bigblock_t *bb;
+ unsigned long flags;
+
+ if (!block)
+ return 0;
+
+ if (!((unsigned long)block & (PAGE_SIZE-1))) {
+ spin_lock_irqsave(&block_lock, flags);
+ for (bb = bigblocks; bb; bb = bb->next)
+ if (bb->pages == block) {
+ spin_unlock_irqrestore(&slob_lock, flags);
+ return PAGE_SIZE << bb->order;
+ }
+ spin_unlock_irqrestore(&block_lock, flags);
+ }
+
+ return ((slob_t *)block - 1)->units * SLOB_UNIT;
+}
+
+struct kmem_cache {
+ unsigned int size, align;
+ const char *name;
+ void (*ctor)(void *, struct kmem_cache *, unsigned long);
+ void (*dtor)(void *, struct kmem_cache *, unsigned long);
+};
+
+struct kmem_cache *kmem_cache_create(const char *name, size_t size,
+ size_t align, unsigned long flags,
+ void (*ctor)(void*, struct kmem_cache *, unsigned long),
+ void (*dtor)(void*, struct kmem_cache *, unsigned long))
+{
+ struct kmem_cache *c;
+
+ c = slob_alloc(sizeof(struct kmem_cache), flags, 0);
+
+ if (c) {
+ c->name = name;
+ c->size = size;
+ c->ctor = ctor;
+ c->dtor = dtor;
+ /* ignore alignment unless it's forced */
+ c->align = (flags & SLAB_MUST_HWCACHE_ALIGN) ? SLOB_ALIGN : 0;
+ if (c->align < align)
+ c->align = align;
+ }
+
+ return c;
+}
+EXPORT_SYMBOL(kmem_cache_create);
+
+int kmem_cache_destroy(struct kmem_cache *c)
+{
+ slob_free(c, sizeof(struct kmem_cache));
+ return 0;
+}
+EXPORT_SYMBOL(kmem_cache_destroy);
+
+void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags)
+{
+ void *b;
+
+ if (c->size < PAGE_SIZE)
+ b = slob_alloc(c->size, flags, c->align);
+ else
+ b = (void *)__get_free_pages(flags, find_order(c->size));
+
+ if (c->ctor)
+ c->ctor(b, c, SLAB_CTOR_CONSTRUCTOR);
+
+ return b;
+}
+EXPORT_SYMBOL(kmem_cache_alloc);
+
+void kmem_cache_free(struct kmem_cache *c, void *b)
+{
+ if (c->dtor)
+ c->dtor(b, c, 0);
+
+ if (c->size < PAGE_SIZE)
+ slob_free(b, c->size);
+ else
+ free_pages((unsigned long)b, find_order(c->size));
+}
+EXPORT_SYMBOL(kmem_cache_free);
+
+unsigned int kmem_cache_size(struct kmem_cache *c)
+{
+ return c->size;
+}
+EXPORT_SYMBOL(kmem_cache_size);
+
+const char *kmem_cache_name(struct kmem_cache *c)
+{
+ return c->name;
+}
+EXPORT_SYMBOL(kmem_cache_name);
+
+static struct timer_list slob_timer = TIMER_INITIALIZER(
+ (void (*)(unsigned long))kmem_cache_init, 0, 0);
+
+void kmem_cache_init(void)
+{
+ void *p = slob_alloc(PAGE_SIZE, 0, PAGE_SIZE-1);
+
+ if (p)
+ free_page((unsigned long)p);
+
+ mod_timer(&slob_timer, jiffies + HZ);
+}
+
+atomic_t slab_reclaim_pages = ATOMIC_INIT(0);
+EXPORT_SYMBOL(slab_reclaim_pages);
+
+#ifdef CONFIG_SMP
+
+void *__alloc_percpu(size_t size, size_t align)
+{
+ int i;
+ struct percpu_data *pdata = kmalloc(sizeof (*pdata), GFP_KERNEL);
+
+ if (!pdata)
+ return NULL;
+
+ for (i = 0; i < NR_CPUS; i++) {
+ if (!cpu_possible(i))
+ continue;
+ pdata->ptrs[i] = kmalloc(size, GFP_KERNEL);
+ if (!pdata->ptrs[i])
+ goto unwind_oom;
+ memset(pdata->ptrs[i], 0, size);
+ }
+
+ /* Catch derefs w/o wrappers */
+ return (void *) (~(unsigned long) pdata);
+
+unwind_oom:
+ while (--i >= 0) {
+ if (!cpu_possible(i))
+ continue;
+ kfree(pdata->ptrs[i]);
+ }
+ kfree(pdata);
+ return NULL;
+}
+EXPORT_SYMBOL(__alloc_percpu);
+
+void
+free_percpu(const void *objp)
+{
+ int i;
+ struct percpu_data *p = (struct percpu_data *) (~(unsigned long) objp);
+
+ for (i = 0; i < NR_CPUS; i++) {
+ if (!cpu_possible(i))
+ continue;
+ kfree(p->ptrs[i]);
+ }
+ kfree(p);
+}
+EXPORT_SYMBOL(free_percpu);
+
+#endif

Privacy Policy