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Message-Id: <1327639810-12760-27-git-send-email-ebiederm@xmission.com>
Date: Thu, 26 Jan 2012 20:50:08 -0800
From: "Eric W. Biederman" <ebiederm@...ssion.com>
To: <linux-kernel@...r.kernel.org>
Cc: <linux-fsdevel@...r.kernel.org>, <netdev@...r.kernel.org>,
Damien Millescamps <damien.millescamps@...nd.com>,
"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 27/29] sysctl: Make the header lists per directory.
Slightly enhance efficiency and clarity of the code by making the
header list per directory instead of per set.
Benchmark before:
make-dummies 0 999 -> 0.63s
rmmod dummy -> 0.12s
make-dummies 0 9999 -> 2m35s
rmmod dummy -> 18s
Benchmark after:
make-dummies 0 999 -> 0.32s
rmmod dummy -> 0.12s
make-dummies 0 9999 -> 1m17s
rmmod dummy -> 17s
Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
fs/proc/proc_sysctl.c | 28 +++++++++++-----------------
include/linux/sysctl.h | 2 +-
2 files changed, 12 insertions(+), 18 deletions(-)
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 160d578..e971ccc 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -33,12 +33,12 @@ static struct ctl_table root_table[] = {
{ }
};
static struct ctl_table_root sysctl_table_root = {
- .default_set.list = LIST_HEAD_INIT(sysctl_table_root.default_set.dir.header.ctl_entry),
+ .default_set.dir.list = LIST_HEAD_INIT(sysctl_table_root.default_set.dir.list),
.default_set.dir.header = {
{{.count = 1,
.nreg = 1,
.ctl_table = root_table,
- .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),}},
+ .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.dir.header.ctl_entry),}},
.ctl_table_arg = root_table,
.root = &sysctl_table_root,
.set = &sysctl_table_root.default_set,
@@ -79,15 +79,12 @@ static int namecmp(const char *name1, int len1, const char *name2, int len2)
static struct ctl_table *find_entry(struct ctl_table_header **phead,
struct ctl_dir *dir, const char *name, int namelen)
{
- struct ctl_table_set *set = dir->header.set;
struct ctl_table_header *head;
struct ctl_table *entry;
- list_for_each_entry(head, &set->list, ctl_entry) {
+ list_for_each_entry(head, &dir->list, ctl_entry) {
if (head->unregistering)
continue;
- if (head->parent != dir)
- continue;
for (entry = head->ctl_table; entry->procname; entry++) {
const char *procname = entry->procname;
if (namecmp(procname, strlen(procname), name, namelen) == 0) {
@@ -133,7 +130,7 @@ static int insert_header(struct ctl_dir *dir, struct ctl_table_header *header)
err = insert_links(header);
if (err)
goto fail_links;
- list_add_tail(&header->ctl_entry, &header->set->list);
+ list_add_tail(&header->ctl_entry, &header->parent->list);
return 0;
fail_links:
header->parent = NULL;
@@ -247,14 +244,12 @@ static struct ctl_table *lookup_entry(struct ctl_table_header **phead,
static struct ctl_table_header *next_usable_entry(struct ctl_dir *dir,
struct list_head *tmp)
{
- struct ctl_table_set *set = dir->header.set;
struct ctl_table_header *head;
- for (tmp = tmp->next; tmp != &set->list; tmp = tmp->next) {
+ for (tmp = tmp->next; tmp != &dir->list; tmp = tmp->next) {
head = list_entry(tmp, struct ctl_table_header, ctl_entry);
- if (head->parent != dir ||
- !head->ctl_table->procname ||
+ if (!head->ctl_table->procname ||
!use_table(head))
continue;
@@ -270,7 +265,7 @@ static void first_entry(struct ctl_dir *dir,
struct ctl_table *entry = NULL;
spin_lock(&sysctl_lock);
- head = next_usable_entry(dir, &dir->header.set->list);
+ head = next_usable_entry(dir, &dir->list);
spin_unlock(&sysctl_lock);
if (head)
entry = head->ctl_table;
@@ -793,6 +788,7 @@ static struct ctl_dir *new_dir(struct ctl_table_set *set,
new_name = (char *)(table + 2);
memcpy(new_name, name, namelen);
new_name[namelen] = '\0';
+ INIT_LIST_HEAD(&new->list);
table[0].procname = new_name;
table[0].mode = S_IFDIR|S_IRUGO|S_IXUGO;
init_header(&new->header, set->dir.header.root, set, table);
@@ -917,12 +913,10 @@ static int sysctl_check_table_dups(struct ctl_dir *dir, struct ctl_table *old,
static int sysctl_check_dups(struct ctl_dir *dir, struct ctl_table *table)
{
- struct ctl_table_set *set;
struct ctl_table_header *head;
int error = 0;
- set = dir->header.set;
- list_for_each_entry(head, &set->list, ctl_entry) {
+ list_for_each_entry(head, &dir->list, ctl_entry) {
if (head->unregistering)
continue;
if (head->parent != dir)
@@ -1494,14 +1488,14 @@ void setup_sysctl_set(struct ctl_table_set *set,
int (*is_seen)(struct ctl_table_set *))
{
memset(set, sizeof(*set), 0);
- INIT_LIST_HEAD(&set->list);
set->is_seen = is_seen;
+ INIT_LIST_HEAD(&set->dir.list);
init_header(&set->dir.header, root, set, root_table);
}
void retire_sysctl_set(struct ctl_table_set *set)
{
- WARN_ON(!list_empty(&set->list));
+ WARN_ON(!list_empty(&set->dir.list));
}
int __init proc_sys_init(void)
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index cec5941..36dec75 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -1047,10 +1047,10 @@ struct ctl_table_header
struct ctl_dir {
/* Header must be at the start of ctl_dir */
struct ctl_table_header header;
+ struct list_head list;
};
struct ctl_table_set {
- struct list_head list;
int (*is_seen)(struct ctl_table_set *);
struct ctl_dir dir;
};
--
1.7.2.5
--
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