[PATCH 7/13] BC: kernel memory (marks)

[Kirill Korotaev <dev@sw.ru>]

Mark some kmem caches with SLAB_BC and some allocations
with __GFP_BC to cause charging/limiting of appropriate
kernel resources.

Signed-off-by: Pavel Emelianov <xemul@sw.ru>
Signed-off-by: Kirill Korotaev <dev@sw.ru>

---

 arch/i386/kernel/ldt.c           |    4 ++--
 arch/i386/mm/init.c              |    4 ++--
 arch/i386/mm/pgtable.c           |    6 ++++--
 drivers/char/tty_io.c            |   10 +++++-----
 fs/file.c                        |    8 ++++----
 fs/locks.c                       |    2 +-
 fs/namespace.c                   |    3 ++-
 fs/select.c                      |    7 ++++---
 include/asm-i386/thread_info.h   |    4 ++--
 include/asm-ia64/pgalloc.h       |   24 +++++++++++++++++-------
 include/asm-x86_64/pgalloc.h     |   12 ++++++++----
 include/asm-x86_64/thread_info.h |    5 +++--
 ipc/msgutil.c                    |    4 ++--
 ipc/sem.c                        |    7 ++++---
 ipc/util.c                       |    8 ++++----
 kernel/fork.c                    |   15 ++++++++-------
 kernel/posix-timers.c            |    3 ++-
 kernel/signal.c                  |    2 +-
 kernel/user.c                    |    2 +-
 mm/rmap.c                        |    3 ++-
 mm/shmem.c                       |    3 ++-
 21 files changed, 80 insertions(+), 56 deletions(-)

--- ./arch/i386/kernel/ldt.c.bckmemch	2006-09-05 12:53:51.000000000 +0400
+++ ./arch/i386/kernel/ldt.c	2006-09-05 12:58:17.000000000 +0400
@@ -39,9 +39,9 @@ static int alloc_ldt(mm_context_t *pc, i
 	oldsize = pc->size;
 	mincount = (mincount+511)&(~511);
 	if (mincount*LDT_ENTRY_SIZE > PAGE_SIZE)
-		newldt = vmalloc(mincount*LDT_ENTRY_SIZE);
+		newldt = vmalloc_bc(mincount*LDT_ENTRY_SIZE);
 	else
-		newldt = kmalloc(mincount*LDT_ENTRY_SIZE, GFP_KERNEL);
+		newldt = kmalloc(mincount*LDT_ENTRY_SIZE, GFP_KERNEL_BC);
 
 	if (!newldt)
 		return -ENOMEM;
--- ./arch/i386/mm/init.c.bckmemch	2006-09-05 12:53:51.000000000 +0400
+++ ./arch/i386/mm/init.c	2006-09-05 12:58:17.000000000 +0400
@@ -709,7 +709,7 @@ void __init pgtable_cache_init(void)
 		pmd_cache = kmem_cache_create("pmd",
 					PTRS_PER_PMD*sizeof(pmd_t),
 					PTRS_PER_PMD*sizeof(pmd_t),
-					0,
+					SLAB_BC,
 					pmd_ctor,
 					NULL);
 		if (!pmd_cache)
@@ -718,7 +718,7 @@ void __init pgtable_cache_init(void)
 	pgd_cache = kmem_cache_create("pgd",
 				PTRS_PER_PGD*sizeof(pgd_t),
 				PTRS_PER_PGD*sizeof(pgd_t),
-				0,
+				SLAB_BC,
 				pgd_ctor,
 				PTRS_PER_PMD == 1 ? pgd_dtor : NULL);
 	if (!pgd_cache)
--- ./arch/i386/mm/pgtable.c.bckmemch	2006-09-05 12:53:51.000000000 +0400
+++ ./arch/i386/mm/pgtable.c	2006-09-05 12:58:17.000000000 +0400
@@ -186,9 +186,11 @@ struct page *pte_alloc_one(struct mm_str
 	struct page *pte;
 
 #ifdef CONFIG_HIGHPTE
-	pte = alloc_pages(GFP_KERNEL|__GFP_HIGHMEM|__GFP_REPEAT|__GFP_ZERO, 0);
+	pte = alloc_pages(GFP_KERNEL|__GFP_HIGHMEM|__GFP_REPEAT|__GFP_ZERO|
+			__GFP_BC | __GFP_BC_LIMIT, 0);
 #else
-	pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
+	pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO|
+			__GFP_BC | __GFP_BC_LIMIT, 0);
 #endif
 	return pte;
 }
--- ./drivers/char/tty_io.c.bckmemch	2006-09-05 12:53:52.000000000 +0400
+++ ./drivers/char/tty_io.c	2006-09-05 12:58:17.000000000 +0400
@@ -165,7 +165,7 @@ static void release_mem(struct tty_struc
 
 static struct tty_struct *alloc_tty_struct(void)
 {
-	return kzalloc(sizeof(struct tty_struct), GFP_KERNEL);
+	return kzalloc(sizeof(struct tty_struct), GFP_KERNEL_BC);
 }
 
 static void tty_buffer_free_all(struct tty_struct *);
@@ -1904,7 +1904,7 @@ static int init_dev(struct tty_driver *d
 
 	if (!*tp_loc) {
 		tp = (struct termios *) kmalloc(sizeof(struct termios),
-						GFP_KERNEL);
+						GFP_KERNEL_BC);
 		if (!tp)
 			goto free_mem_out;
 		*tp = driver->init_termios;
@@ -1912,7 +1912,7 @@ static int init_dev(struct tty_driver *d
 
 	if (!*ltp_loc) {
 		ltp = (struct termios *) kmalloc(sizeof(struct termios),
-						 GFP_KERNEL);
+						 GFP_KERNEL_BC);
 		if (!ltp)
 			goto free_mem_out;
 		memset(ltp, 0, sizeof(struct termios));
@@ -1937,7 +1937,7 @@ static int init_dev(struct tty_driver *d
 
 		if (!*o_tp_loc) {
 			o_tp = (struct termios *)
-				kmalloc(sizeof(struct termios), GFP_KERNEL);
+				kmalloc(sizeof(struct termios), GFP_KERNEL_BC);
 			if (!o_tp)
 				goto free_mem_out;
 			*o_tp = driver->other->init_termios;
@@ -1945,7 +1945,7 @@ static int init_dev(struct tty_driver *d
 
 		if (!*o_ltp_loc) {
 			o_ltp = (struct termios *)
-				kmalloc(sizeof(struct termios), GFP_KERNEL);
+				kmalloc(sizeof(struct termios), GFP_KERNEL_BC);
 			if (!o_ltp)
 				goto free_mem_out;
 			memset(o_ltp, 0, sizeof(struct termios));
--- ./fs/file.c.bckmemch	2006-09-05 12:53:55.000000000 +0400
+++ ./fs/file.c	2006-09-05 12:58:17.000000000 +0400
@@ -44,9 +44,9 @@ struct file ** alloc_fd_array(int num)
 	int size = num * sizeof(struct file *);
 
 	if (size <= PAGE_SIZE)
-		new_fds = (struct file **) kmalloc(size, GFP_KERNEL);
+		new_fds = (struct file **) kmalloc(size, GFP_KERNEL_BC);
 	else 
-		new_fds = (struct file **) vmalloc(size);
+		new_fds = (struct file **) vmalloc_bc(size);
 	return new_fds;
 }
 
@@ -213,9 +213,9 @@ fd_set * alloc_fdset(int num)
 	int size = num / 8;
 
 	if (size <= PAGE_SIZE)
-		new_fdset = (fd_set *) kmalloc(size, GFP_KERNEL);
+		new_fdset = (fd_set *) kmalloc(size, GFP_KERNEL_BC);
 	else
-		new_fdset = (fd_set *) vmalloc(size);
+		new_fdset = (fd_set *) vmalloc_bc(size);
 	return new_fdset;
 }
 
--- ./fs/locks.c.bckmemch	2006-09-05 12:53:55.000000000 +0400
+++ ./fs/locks.c	2006-09-05 12:58:17.000000000 +0400
@@ -2228,7 +2228,7 @@ EXPORT_SYMBOL(lock_may_write);
 static int __init filelock_init(void)
 {
 	filelock_cache = kmem_cache_create("file_lock_cache",
-			sizeof(struct file_lock), 0, SLAB_PANIC,
+			sizeof(struct file_lock), 0, SLAB_PANIC | SLAB_BC,
 			init_once, NULL);
 	return 0;
 }
--- ./fs/namespace.c.bckmemch	2006-09-05 12:53:55.000000000 +0400
+++ ./fs/namespace.c	2006-09-05 12:58:17.000000000 +0400
@@ -1812,7 +1812,8 @@ void __init mnt_init(unsigned long mempa
 	init_rwsem(&namespace_sem);
 
 	mnt_cache = kmem_cache_create("mnt_cache", sizeof(struct vfsmount),
-			0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL, NULL);
+			0, SLAB_HWCACHE_ALIGN | SLAB_BC | SLAB_PANIC,
+			NULL, NULL);
 
 	mount_hashtable = (struct list_head *)__get_free_page(GFP_ATOMIC);
 
--- ./fs/select.c.bckmemch	2006-09-05 12:53:55.000000000 +0400
+++ ./fs/select.c	2006-09-05 12:58:17.000000000 +0400
@@ -103,7 +103,8 @@ static struct poll_table_entry *poll_get
 	if (!table || POLL_TABLE_FULL(table)) {
 		struct poll_table_page *new_table;
 
-		new_table = (struct poll_table_page *) __get_free_page(GFP_KERNEL);
+		new_table = (struct poll_table_page *)
+			__get_free_page(GFP_KERNEL_BC);
 		if (!new_table) {
 			p->error = -ENOMEM;
 			__set_current_state(TASK_RUNNING);
@@ -339,7 +340,7 @@ static int core_sys_select(int n, fd_set
 	if (size > sizeof(stack_fds) / 6) {
 		/* Not enough space in on-stack array; must use kmalloc */
 		ret = -ENOMEM;
-		bits = kmalloc(6 * size, GFP_KERNEL);
+		bits = kmalloc(6 * size, GFP_KERNEL_BC);
 		if (!bits)
 			goto out_nofds;
 	}
@@ -693,7 +694,7 @@ int do_sys_poll(struct pollfd __user *uf
 		if (!stack_pp)
 			stack_pp = pp = (struct poll_list *)stack_pps;
 		else {
-			pp = kmalloc(size, GFP_KERNEL);
+			pp = kmalloc(size, GFP_KERNEL_BC);
 			if (!pp)
 				goto out_fds;
 		}
--- ./include/asm-i386/thread_info.h.bckmemch	2006-07-10 12:39:19.000000000 +0400
+++ ./include/asm-i386/thread_info.h	2006-09-05 12:58:17.000000000 +0400
@@ -99,13 +99,13 @@ static inline struct thread_info *curren
 	({							\
 		struct thread_info *ret;			\
 								\
-		ret = kmalloc(THREAD_SIZE, GFP_KERNEL);		\
+		ret = kmalloc(THREAD_SIZE, GFP_KERNEL_BC);	\
 		if (ret)					\
 			memset(ret, 0, THREAD_SIZE);		\
 		ret;						\
 	})
 #else
-#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
+#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL_BC)
 #endif
 
 #define free_thread_info(info)	kfree(info)
--- ./include/asm-ia64/pgalloc.h.bckmemch	2006-07-10 12:39:19.000000000 +0400
+++ ./include/asm-ia64/pgalloc.h	2006-09-05 12:58:17.000000000 +0400
@@ -19,6 +19,8 @@
 #include <linux/page-flags.h>
 #include <linux/threads.h>
 
+#include <bc/kmem.h>
+
 #include <asm/mmu_context.h>
 
 DECLARE_PER_CPU(unsigned long *, __pgtable_quicklist);
@@ -37,7 +39,7 @@ static inline long pgtable_quicklist_tot
 	return ql_size;
 }
 
-static inline void *pgtable_quicklist_alloc(void)
+static inline void *pgtable_quicklist_alloc(int charge)
 {
 	unsigned long *ret = NULL;
 
@@ -45,13 +47,20 @@ static inline void *pgtable_quicklist_al
 
 	ret = pgtable_quicklist;
 	if (likely(ret != NULL)) {
+		if (charge && bc_page_charge(virt_to_page(ret),
+					0, __GFP_BC_LIMIT)) {
+			ret = NULL;
+			goto out;
+		}
 		pgtable_quicklist = (unsigned long *)(*ret);
 		ret[0] = 0;
 		--pgtable_quicklist_size;
+out:
 		preempt_enable();
 	} else {
 		preempt_enable();
-		ret = (unsigned long *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
+		ret = (unsigned long *)__get_free_page(GFP_KERNEL |
+				__GFP_ZERO | __GFP_BC | __GFP_BC_LIMIT);
 	}
 
 	return ret;
@@ -69,6 +78,7 @@ static inline void pgtable_quicklist_fre
 #endif
 
 	preempt_disable();
+	bc_page_uncharge(virt_to_page(pgtable_entry), 0);
 	*(unsigned long *)pgtable_entry = (unsigned long)pgtable_quicklist;
 	pgtable_quicklist = (unsigned long *)pgtable_entry;
 	++pgtable_quicklist_size;
@@ -77,7 +87,7 @@ static inline void pgtable_quicklist_fre
 
 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
 {
-	return pgtable_quicklist_alloc();
+	return pgtable_quicklist_alloc(1);
 }
 
 static inline void pgd_free(pgd_t * pgd)
@@ -94,7 +104,7 @@ pgd_populate(struct mm_struct *mm, pgd_t
 
 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
 {
-	return pgtable_quicklist_alloc();
+	return pgtable_quicklist_alloc(1);
 }
 
 static inline void pud_free(pud_t * pud)
@@ -112,7 +122,7 @@ pud_populate(struct mm_struct *mm, pud_t
 
 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
 {
-	return pgtable_quicklist_alloc();
+	return pgtable_quicklist_alloc(1);
 }
 
 static inline void pmd_free(pmd_t * pmd)
@@ -137,13 +147,13 @@ pmd_populate_kernel(struct mm_struct *mm
 static inline struct page *pte_alloc_one(struct mm_struct *mm,
 					 unsigned long addr)
 {
-	return virt_to_page(pgtable_quicklist_alloc());
+	return virt_to_page(pgtable_quicklist_alloc(1));
 }
 
 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 					  unsigned long addr)
 {
-	return pgtable_quicklist_alloc();
+	return pgtable_quicklist_alloc(0);
 }
 
 static inline void pte_free(struct page *pte)
--- ./include/asm-x86_64/pgalloc.h.bckmemch	2006-04-21 11:59:36.000000000 +0400
+++ ./include/asm-x86_64/pgalloc.h	2006-09-05 12:58:17.000000000 +0400
@@ -31,12 +31,14 @@ static inline void pmd_free(pmd_t *pmd)
 
 static inline pmd_t *pmd_alloc_one (struct mm_struct *mm, unsigned long addr)
 {
-	return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
+	return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT|
+			__GFP_BC | __GFP_BC_LIMIT);
 }
 
 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
 {
-	return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
+	return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT|
+			__GFP_BC | __GFP_BC_LIMIT);
 }
 
 static inline void pud_free (pud_t *pud)
@@ -74,7 +76,8 @@ static inline void pgd_list_del(pgd_t *p
 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
 {
 	unsigned boundary;
-	pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
+	pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|
+			__GFP_BC | __GFP_BC_LIMIT);
 	if (!pgd)
 		return NULL;
 	pgd_list_add(pgd);
@@ -105,7 +108,8 @@ static inline pte_t *pte_alloc_one_kerne
 
 static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
 {
-	void *p = (void *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
+	void *p = (void *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT|
+			__GFP_BC | __GFP_BC_LIMIT);
 	if (!p)
 		return NULL;
 	return virt_to_page(p);
--- ./include/asm-x86_64/thread_info.h.bckmemch	2006-09-05 12:53:55.000000000 +0400
+++ ./include/asm-x86_64/thread_info.h	2006-09-05 12:58:17.000000000 +0400
@@ -78,14 +78,15 @@ static inline struct thread_info *stack_
     ({								\
 	struct thread_info *ret;				\
 								\
-	ret = ((struct thread_info *) __get_free_pages(GFP_KERNEL,THREAD_ORDER)); \
+	ret = ((struct thread_info *) __get_free_pages(GFP_KERNEL_BC,	\
+				THREAD_ORDER)); 		\
 	if (ret)						\
 		memset(ret, 0, THREAD_SIZE);			\
 	ret;							\
     })
 #else
 #define alloc_thread_info(tsk) \
-	((struct thread_info *) __get_free_pages(GFP_KERNEL,THREAD_ORDER))
+	((struct thread_info *) __get_free_pages(GFP_KERNEL_BC,THREAD_ORDER))
 #endif
 
 #define free_thread_info(ti) free_pages((unsigned long) (ti), THREAD_ORDER)
--- ./ipc/msgutil.c.bckmemch	2006-04-21 11:59:36.000000000 +0400
+++ ./ipc/msgutil.c	2006-09-05 12:58:17.000000000 +0400
@@ -36,7 +36,7 @@ struct msg_msg *load_msg(const void __us
 	if (alen > DATALEN_MSG)
 		alen = DATALEN_MSG;
 
-	msg = (struct msg_msg *)kmalloc(sizeof(*msg) + alen, GFP_KERNEL);
+	msg = (struct msg_msg *)kmalloc(sizeof(*msg) + alen, GFP_KERNEL_BC);
 	if (msg == NULL)
 		return ERR_PTR(-ENOMEM);
 
@@ -57,7 +57,7 @@ struct msg_msg *load_msg(const void __us
 		if (alen > DATALEN_SEG)
 			alen = DATALEN_SEG;
 		seg = (struct msg_msgseg *)kmalloc(sizeof(*seg) + alen,
-						 GFP_KERNEL);
+						 GFP_KERNEL_BC);
 		if (seg == NULL) {
 			err = -ENOMEM;
 			goto out_err;
--- ./ipc/sem.c.bckmemch	2006-09-05 12:53:59.000000000 +0400
+++ ./ipc/sem.c	2006-09-05 12:58:17.000000000 +0400
@@ -1006,7 +1006,7 @@ static inline int get_undo_list(struct s
 
 	undo_list = current->sysvsem.undo_list;
 	if (!undo_list) {
-		undo_list = kzalloc(sizeof(*undo_list), GFP_KERNEL);
+		undo_list = kzalloc(sizeof(*undo_list), GFP_KERNEL_BC);
 		if (undo_list == NULL)
 			return -ENOMEM;
 		spin_lock_init(&undo_list->lock);
@@ -1069,7 +1069,8 @@ static struct sem_undo *find_undo(struct
 	ipc_rcu_getref(sma);
 	sem_unlock(sma);
 
-	new = (struct sem_undo *) kmalloc(sizeof(struct sem_undo) + sizeof(short)*nsems, GFP_KERNEL);
+	new = (struct sem_undo *) kmalloc(sizeof(struct sem_undo) +
+			sizeof(short)*nsems, GFP_KERNEL_BC);
 	if (!new) {
 		ipc_lock_by_ptr(&sma->sem_perm);
 		ipc_rcu_putref(sma);
@@ -1130,7 +1131,7 @@ asmlinkage long sys_semtimedop(int semid
 	if (nsops > ns->sc_semopm)
 		return -E2BIG;
 	if(nsops > SEMOPM_FAST) {
-		sops = kmalloc(sizeof(*sops)*nsops,GFP_KERNEL);
+		sops = kmalloc(sizeof(*sops)*nsops,GFP_KERNEL_BC);
 		if(sops==NULL)
 			return -ENOMEM;
 	}
--- ./ipc/util.c.bckmemch	2006-09-05 12:53:59.000000000 +0400
+++ ./ipc/util.c	2006-09-05 12:58:17.000000000 +0400
@@ -406,9 +406,9 @@ void* ipc_alloc(int size)
 {
 	void* out;
 	if(size > PAGE_SIZE)
-		out = vmalloc(size);
+		out = vmalloc_bc(size);
 	else
-		out = kmalloc(size, GFP_KERNEL);
+		out = kmalloc(size, GFP_KERNEL_BC);
 	return out;
 }
 
@@ -491,14 +491,14 @@ void* ipc_rcu_alloc(int size)
 	 * workqueue if necessary (for vmalloc). 
 	 */
 	if (rcu_use_vmalloc(size)) {
-		out = vmalloc(HDRLEN_VMALLOC + size);
+		out = vmalloc_bc(HDRLEN_VMALLOC + size);
 		if (out) {
 			out += HDRLEN_VMALLOC;
 			container_of(out, struct ipc_rcu_hdr, data)->is_vmalloc = 1;
 			container_of(out, struct ipc_rcu_hdr, data)->refcount = 1;
 		}
 	} else {
-		out = kmalloc(HDRLEN_KMALLOC + size, GFP_KERNEL);
+		out = kmalloc(HDRLEN_KMALLOC + size, GFP_KERNEL_BC);
 		if (out) {
 			out += HDRLEN_KMALLOC;
 			container_of(out, struct ipc_rcu_hdr, data)->is_vmalloc = 0;
--- ./kernel/fork.c.bckmemch	2006-09-05 12:54:21.000000000 +0400
+++ ./kernel/fork.c	2006-09-05 12:58:17.000000000 +0400
@@ -137,7 +137,7 @@ void __init fork_init(unsigned long memp
 	/* create a slab on which task_structs can be allocated */
 	task_struct_cachep =
 		kmem_cache_create("task_struct", sizeof(struct task_struct),
-			ARCH_MIN_TASKALIGN, SLAB_PANIC, NULL, NULL);
+			ARCH_MIN_TASKALIGN, SLAB_PANIC | SLAB_BC, NULL, NULL);
 #endif
 
 	/*
@@ -1424,23 +1424,24 @@ void __init proc_caches_init(void)
 {
 	sighand_cachep = kmem_cache_create("sighand_cache",
 			sizeof(struct sighand_struct), 0,
-			SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_DESTROY_BY_RCU,
+			SLAB_HWCACHE_ALIGN | SLAB_PANIC | \
+				SLAB_DESTROY_BY_RCU | SLAB_BC,
 			sighand_ctor, NULL);
 	signal_cachep = kmem_cache_create("signal_cache",
 			sizeof(struct signal_struct), 0,
-			SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
+			SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_BC, NULL, NULL);
 	files_cachep = kmem_cache_create("files_cache", 
 			sizeof(struct files_struct), 0,
-			SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
+			SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_BC, NULL, NULL);
 	fs_cachep = kmem_cache_create("fs_cache", 
 			sizeof(struct fs_struct), 0,
-			SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
+			SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_BC, NULL, NULL);
 	vm_area_cachep = kmem_cache_create("vm_area_struct",
 			sizeof(struct vm_area_struct), 0,
-			SLAB_PANIC, NULL, NULL);
+			SLAB_PANIC|SLAB_BC, NULL, NULL);
 	mm_cachep = kmem_cache_create("mm_struct",
 			sizeof(struct mm_struct), ARCH_MIN_MMSTRUCT_ALIGN,
-			SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
+			SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_BC, NULL, NULL);
 }
 
 
--- ./kernel/posix-timers.c.bckmemch	2006-09-05 12:53:59.000000000 +0400
+++ ./kernel/posix-timers.c	2006-09-05 12:58:17.000000000 +0400
@@ -242,7 +242,8 @@ static __init int init_posix_timers(void
 	register_posix_clock(CLOCK_MONOTONIC, &clock_monotonic);
 
 	posix_timers_cache = kmem_cache_create("posix_timers_cache",
-					sizeof (struct k_itimer), 0, 0, NULL, NULL);
+					sizeof (struct k_itimer), 0, SLAB_BC,
+					NULL, NULL);
 	idr_init(&posix_timers_id);
 	return 0;
 }
--- ./kernel/signal.c.bckmemch	2006-09-05 12:53:59.000000000 +0400
+++ ./kernel/signal.c	2006-09-05 12:58:17.000000000 +0400
@@ -2748,5 +2748,5 @@ void __init signals_init(void)
 		kmem_cache_create("sigqueue",
 				  sizeof(struct sigqueue),
 				  __alignof__(struct sigqueue),
-				  SLAB_PANIC, NULL, NULL);
+				  SLAB_PANIC | SLAB_BC, NULL, NULL);
 }
--- ./kernel/user.c.bckmemch	2006-09-05 12:54:09.000000000 +0400
+++ ./kernel/user.c	2006-09-05 12:58:17.000000000 +0400
@@ -194,7 +194,7 @@ static int __init uid_cache_init(void)
 	int n;
 
 	uid_cachep = kmem_cache_create("uid_cache", sizeof(struct user_struct),
-			0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
+			0, SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_BC, NULL, NULL);
 
 	for(n = 0; n < UIDHASH_SZ; ++n)
 		INIT_LIST_HEAD(uidhash_table + n);
--- ./mm/rmap.c.bckmemch	2006-09-05 12:53:59.000000000 +0400
+++ ./mm/rmap.c	2006-09-05 12:58:17.000000000 +0400
@@ -179,7 +179,8 @@ static void anon_vma_ctor(void *data, st
 void __init anon_vma_init(void)
 {
 	anon_vma_cachep = kmem_cache_create("anon_vma", sizeof(struct anon_vma),
-			0, SLAB_DESTROY_BY_RCU|SLAB_PANIC, anon_vma_ctor, NULL);
+			0, SLAB_DESTROY_BY_RCU|SLAB_PANIC|SLAB_BC,
+			anon_vma_ctor, NULL);
 }
 
 /*
--- ./mm/shmem.c.bckmemch	2006-09-05 12:53:59.000000000 +0400
+++ ./mm/shmem.c	2006-09-05 12:58:17.000000000 +0400
@@ -368,7 +368,8 @@ static swp_entry_t *shmem_swp_alloc(stru
 		}
 
 		spin_unlock(&info->lock);
-		page = shmem_dir_alloc(mapping_gfp_mask(inode->i_mapping) | __GFP_ZERO);
+		page = shmem_dir_alloc(mapping_gfp_mask(inode->i_mapping) | \
+				__GFP_ZERO | __GFP_BC);
 		if (page)
 			set_page_private(page, 0);
 		spin_lock(&info->lock);