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Subject[PATCH] [4/6] HUGETLB memory commitment
[070-mem_acctdom_hugetlb]

Convert hugetlb to accounting domains (core)

---
fs/hugetlbfs/inode.c | 45 ++++++++++++++++++++++++++++++++++++++-------
include/linux/hugetlb.h | 5 +++++
security/commoncap.c | 9 +++++++++
security/dummy.c | 9 +++++++++
security/selinux/hooks.c | 9 +++++++++
5 files changed, 70 insertions(+), 7 deletions(-)
diff -upN reference/fs/hugetlbfs/inode.c current/fs/hugetlbfs/inode.c
--- reference/fs/hugetlbfs/inode.c 2004-03-25 02:43:00.000000000 +0000
+++ current/fs/hugetlbfs/inode.c 2004-03-25 15:03:33.000000000 +0000
@@ -26,12 +26,15 @@
#include <linux/dnotify.h>
#include <linux/statfs.h>
#include <linux/security.h>
+#include <linux/mman.h>

#include <asm/uaccess.h>

/* some random number */
#define HUGETLBFS_MAGIC 0x958458f6

+#define VM_ACCT(size) (PAGE_CACHE_ALIGN(size) >> PAGE_SHIFT)
+
static struct super_operations hugetlbfs_ops;
static struct address_space_operations hugetlbfs_aops;
struct file_operations hugetlbfs_file_operations;
@@ -191,6 +194,7 @@ void truncate_hugepages(struct address_s
static void hugetlbfs_delete_inode(struct inode *inode)
{
struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(inode->i_sb);
+ long change;

hlist_del_init(&inode->i_hash);
list_del_init(&inode->i_list);
@@ -198,6 +202,9 @@ static void hugetlbfs_delete_inode(struc
inodes_stat.nr_inodes--;
spin_unlock(&inode_lock);

+ change = VM_ACCT(inode->i_size) - VM_ACCT(0);
+ if (change)
+ vm_unacct_memory(VM_AD_HUGETLB, change);
if (inode->i_data.nrpages)
truncate_hugepages(&inode->i_data, 0);

@@ -217,6 +224,7 @@ static void hugetlbfs_forget_inode(struc
{
struct super_block *super_block = inode->i_sb;
struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(super_block);
+ long change;

if (hlist_unhashed(&inode->i_hash))
goto out_truncate;
@@ -239,6 +247,9 @@ out_truncate:
inode->i_state |= I_FREEING;
inodes_stat.nr_inodes--;
spin_unlock(&inode_lock);
+ change = VM_ACCT(inode->i_size) - VM_ACCT(0);
+ if (change)
+ vm_unacct_memory(VM_AD_HUGETLB, change);
if (inode->i_data.nrpages)
truncate_hugepages(&inode->i_data, 0);

@@ -312,8 +323,10 @@ static int hugetlb_vmtruncate(struct ino
unsigned long pgoff;
struct address_space *mapping = inode->i_mapping;

+ /*
if (offset > inode->i_size)
return -EINVAL;
+ */

BUG_ON(offset & ~HPAGE_MASK);
pgoff = offset >> HPAGE_SHIFT;
@@ -334,6 +347,8 @@ static int hugetlbfs_setattr(struct dent
struct inode *inode = dentry->d_inode;
int error;
unsigned int ia_valid = attr->ia_valid;
+ long change = 0;
+ loff_t csize;

BUG_ON(!inode);

@@ -345,15 +360,27 @@ static int hugetlbfs_setattr(struct dent
if (error)
goto out;
if (ia_valid & ATTR_SIZE) {
+ csize = i_size_read(inode);
error = -EINVAL;
- if (!(attr->ia_size & ~HPAGE_MASK))
- error = hugetlb_vmtruncate(inode, attr->ia_size);
- if (error)
+ if (!(attr->ia_size & ~HPAGE_MASK))
+ goto out;
+ if (attr->ia_size > csize)
goto out;
+ change = VM_ACCT(csize) - VM_ACCT(attr->ia_size);
+ if (change)
+ vm_unacct_memory(VM_AD_HUGETLB, change);
+ /* XXX: here we commit to removing the mappings, should we do
+ * this before we attmempt to write the inode or after. What
+ * should we do if it fails?
+ */
+ hugetlb_vmtruncate(inode, attr->ia_size);
attr->ia_valid &= ~ATTR_SIZE;
}
error = inode_setattr(inode, attr);
out:
+ if (error && change)
+ vm_acct_memory(VM_AD_HUGETLB, change);
+
return error;
}

@@ -710,17 +737,19 @@ struct file *hugetlb_zero_setup(size_t s
if (!capable(CAP_IPC_LOCK))
return ERR_PTR(-EPERM);

- if (!is_hugepage_mem_enough(size))
+ if (security_vm_enough_memory(VM_AD_HUGETLB, VM_ACCT(size)))
return ERR_PTR(-ENOMEM);
-
+
root = hugetlbfs_vfsmount->mnt_root;
snprintf(buf, 16, "%lu", hugetlbfs_counter());
quick_string.name = buf;
quick_string.len = strlen(quick_string.name);
quick_string.hash = 0;
dentry = d_alloc(root, &quick_string);
- if (!dentry)
- return ERR_PTR(-ENOMEM);
+ if (!dentry) {
+ error = -ENOMEM;
+ goto out_committed;
+ }

error = -ENFILE;
file = get_empty_filp();
@@ -747,6 +776,8 @@ out_file:
put_filp(file);
out_dentry:
dput(dentry);
+out_committed:
+ vm_unacct_memory(VM_AD_HUGETLB, VM_ACCT(size));
return ERR_PTR(error);
}

diff -upN reference/include/linux/hugetlb.h current/include/linux/hugetlb.h
--- reference/include/linux/hugetlb.h 2004-02-23 18:15:09.000000000 +0000
+++ current/include/linux/hugetlb.h 2004-03-25 15:03:33.000000000 +0000
@@ -19,6 +19,7 @@ int hugetlb_prefault(struct address_spac
void huge_page_release(struct page *);
int hugetlb_report_meminfo(char *);
int is_hugepage_mem_enough(size_t);
+unsigned long hugetlb_total_pages(void);
struct page *follow_huge_addr(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long address, int write);
struct vm_area_struct *hugepage_vma(struct mm_struct *mm,
@@ -48,6 +49,10 @@ static inline int is_vm_hugetlb_page(str
{
return 0;
}
+static inline unsigned long hugetlb_total_pages(void)
+{
+ return 0;
+}

#define follow_hugetlb_page(m,v,p,vs,a,b,i) ({ BUG(); 0; })
#define follow_huge_addr(mm, vma, addr, write) 0
diff -upN reference/security/commoncap.c current/security/commoncap.c
--- reference/security/commoncap.c 2004-03-25 15:03:32.000000000 +0000
+++ current/security/commoncap.c 2004-03-25 15:03:33.000000000 +0000
@@ -22,6 +22,7 @@
#include <linux/netlink.h>
#include <linux/ptrace.h>
#include <linux/xattr.h>
+#include <linux/hugetlb.h>

int cap_capable (struct task_struct *tsk, int cap)
{
@@ -314,6 +315,13 @@ int cap_vm_enough_memory(int domain, lon

vm_acct_memory(domain, pages);

+ /* Check against the full compliment of hugepages, no reserve. */
+ if (domain == VM_AD_HUGETLB) {
+ allowed = hugetlb_total_pages();
+
+ goto check;
+ }
+
/* We only account for the default memory domain, assume overcommit
* for all others.
*/
@@ -367,6 +375,7 @@ int cap_vm_enough_memory(int domain, lon
allowed = totalram_pages * sysctl_overcommit_ratio / 100;
allowed += total_swap_pages;

+check:
if (atomic_read(&vm_committed_space[domain]) < allowed)
return 0;

diff -upN reference/security/dummy.c current/security/dummy.c
--- reference/security/dummy.c 2004-03-25 15:03:32.000000000 +0000
+++ current/security/dummy.c 2004-03-25 15:03:33.000000000 +0000
@@ -25,6 +25,7 @@
#include <linux/netlink.h>
#include <net/sock.h>
#include <linux/xattr.h>
+#include <linux/hugetlb.h>

static int dummy_ptrace (struct task_struct *parent, struct task_struct *child)
{
@@ -115,6 +116,13 @@ static int dummy_vm_enough_memory(int do

vm_acct_memory(domain, pages);

+ /* Check against the full compliment of hugepages, no reserve. */
+ if (domain == VM_AD_HUGETLB) {
+ allowed = hugetlb_total_pages();
+
+ goto check;
+ }
+
/* We only account for the default memory domain, assume overcommit
* for all others.
*/
@@ -155,6 +163,7 @@ static int dummy_vm_enough_memory(int do
allowed = totalram_pages * sysctl_overcommit_ratio / 100;
allowed += total_swap_pages;

+check:
if (atomic_read(&vm_committed_space[domain]) < allowed)
return 0;

diff -upN reference/security/selinux/hooks.c current/security/selinux/hooks.c
--- reference/security/selinux/hooks.c 2004-03-25 15:03:32.000000000 +0000
+++ current/security/selinux/hooks.c 2004-03-25 15:03:33.000000000 +0000
@@ -59,6 +59,7 @@
#include <net/af_unix.h> /* for Unix socket types */
#include <linux/parser.h>
#include <linux/nfs_mount.h>
+#include <linux/hugetlb.h>

#include "avc.h"
#include "objsec.h"
@@ -1504,6 +1505,13 @@ static int selinux_vm_enough_memory(int

vm_acct_memory(domain, pages);

+ /* Check against the full compliment of hugepages, no reserve. */
+ if (domain == VM_AD_HUGETLB) {
+ allowed = hugetlb_total_pages();
+
+ goto check;
+ }
+
/* We only account for the default memory domain, assume overcommit
* for all others.
*/
@@ -1553,6 +1561,7 @@ static int selinux_vm_enough_memory(int
allowed = totalram_pages * sysctl_overcommit_ratio / 100;
allowed += total_swap_pages;

+check:
if (atomic_read(&vm_committed_space[domain]) < allowed)
return 0;

-
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