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authorEric W. Biederman <ebiederm@xmission.com>2006-03-31 02:31:42 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-31 12:19:00 -0800
commit92476d7fc0326a409ab1d3864a04093a6be9aca7 (patch)
treeea50a5a31522492d9915e0763a7adc6ac87c4fbc /kernel/pid.c
parent8c7904a00b06d2ee51149794b619e07369fcf9d4 (diff)
[PATCH] pidhash: Refactor the pid hash table
Simplifies the code, reduces the need for 4 pid hash tables, and makes the code more capable. In the discussions I had with Oleg it was felt that to a large extent the cleanup itself justified the work. With struct pid being dynamically allocated meant we could create the hash table entry when the pid was allocated and free the hash table entry when the pid was freed. Instead of playing with the hash lists when ever a process would attach or detach to a process. For myself the fact that it gave what my previous task_ref patch gave for free with simpler code was a big win. The problem is that if you hold a reference to struct task_struct you lock in 10K of low memory. If you do that in a user controllable way like /proc does, with an unprivileged but hostile user space application with typical resource limits of 1000 fds and 100 processes I can trigger the OOM killer by consuming all of low memory with task structs, on a machine wight 1GB of low memory. If I instead hold a reference to struct pid which holds a pointer to my task_struct, I don't suffer from that problem because struct pid is 2 orders of magnitude smaller. In fact struct pid is small enough that most other kernel data structures dwarf it, so simply limiting the number of referring data structures is enough to prevent exhaustion of low memory. This splits the current struct pid into two structures, struct pid and struct pid_link, and reduces our number of hash tables from PIDTYPE_MAX to just one. struct pid_link is the per process linkage into the hash tables and lives in struct task_struct. struct pid is given an indepedent lifetime, and holds pointers to each of the pid types. The independent life of struct pid simplifies attach_pid, and detach_pid, because we are always manipulating the list of pids and not the hash table. In addition in giving struct pid an indpendent life it makes the concept much more powerful. Kernel data structures can now embed a struct pid * instead of a pid_t and not suffer from pid wrap around problems or from keeping unnecessarily large amounts of memory allocated. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/pid.c')
-rw-r--r--kernel/pid.c212
1 files changed, 146 insertions, 66 deletions
diff --git a/kernel/pid.c b/kernel/pid.c
index a9f2dfd006d..eeb836b65ca 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -28,8 +28,9 @@
#include <linux/hash.h>
#define pid_hashfn(nr) hash_long((unsigned long)nr, pidhash_shift)
-static struct hlist_head *pid_hash[PIDTYPE_MAX];
+static struct hlist_head *pid_hash;
static int pidhash_shift;
+static kmem_cache_t *pid_cachep;
int pid_max = PID_MAX_DEFAULT;
int last_pid;
@@ -60,9 +61,22 @@ typedef struct pidmap {
static pidmap_t pidmap_array[PIDMAP_ENTRIES] =
{ [ 0 ... PIDMAP_ENTRIES-1 ] = { ATOMIC_INIT(BITS_PER_PAGE), NULL } };
+/*
+ * Note: disable interrupts while the pidmap_lock is held as an
+ * interrupt might come in and do read_lock(&tasklist_lock).
+ *
+ * If we don't disable interrupts there is a nasty deadlock between
+ * detach_pid()->free_pid() and another cpu that does
+ * spin_lock(&pidmap_lock) followed by an interrupt routine that does
+ * read_lock(&tasklist_lock);
+ *
+ * After we clean up the tasklist_lock and know there are no
+ * irq handlers that take it we can leave the interrupts enabled.
+ * For now it is easier to be safe than to prove it can't happen.
+ */
static __cacheline_aligned_in_smp DEFINE_SPINLOCK(pidmap_lock);
-fastcall void free_pidmap(int pid)
+static fastcall void free_pidmap(int pid)
{
pidmap_t *map = pidmap_array + pid / BITS_PER_PAGE;
int offset = pid & BITS_PER_PAGE_MASK;
@@ -71,7 +85,7 @@ fastcall void free_pidmap(int pid)
atomic_inc(&map->nr_free);
}
-int alloc_pidmap(void)
+static int alloc_pidmap(void)
{
int i, offset, max_scan, pid, last = last_pid;
pidmap_t *map;
@@ -89,12 +103,12 @@ int alloc_pidmap(void)
* Free the page if someone raced with us
* installing it:
*/
- spin_lock(&pidmap_lock);
+ spin_lock_irq(&pidmap_lock);
if (map->page)
free_page(page);
else
map->page = (void *)page;
- spin_unlock(&pidmap_lock);
+ spin_unlock_irq(&pidmap_lock);
if (unlikely(!map->page))
break;
}
@@ -131,13 +145,73 @@ int alloc_pidmap(void)
return -1;
}
-struct pid * fastcall find_pid(enum pid_type type, int nr)
+fastcall void put_pid(struct pid *pid)
+{
+ if (!pid)
+ return;
+ if ((atomic_read(&pid->count) == 1) ||
+ atomic_dec_and_test(&pid->count))
+ kmem_cache_free(pid_cachep, pid);
+}
+
+static void delayed_put_pid(struct rcu_head *rhp)
+{
+ struct pid *pid = container_of(rhp, struct pid, rcu);
+ put_pid(pid);
+}
+
+fastcall void free_pid(struct pid *pid)
+{
+ /* We can be called with write_lock_irq(&tasklist_lock) held */
+ unsigned long flags;
+
+ spin_lock_irqsave(&pidmap_lock, flags);
+ hlist_del_rcu(&pid->pid_chain);
+ spin_unlock_irqrestore(&pidmap_lock, flags);
+
+ free_pidmap(pid->nr);
+ call_rcu(&pid->rcu, delayed_put_pid);
+}
+
+struct pid *alloc_pid(void)
+{
+ struct pid *pid;
+ enum pid_type type;
+ int nr = -1;
+
+ pid = kmem_cache_alloc(pid_cachep, GFP_KERNEL);
+ if (!pid)
+ goto out;
+
+ nr = alloc_pidmap();
+ if (nr < 0)
+ goto out_free;
+
+ atomic_set(&pid->count, 1);
+ pid->nr = nr;
+ for (type = 0; type < PIDTYPE_MAX; ++type)
+ INIT_HLIST_HEAD(&pid->tasks[type]);
+
+ spin_lock_irq(&pidmap_lock);
+ hlist_add_head_rcu(&pid->pid_chain, &pid_hash[pid_hashfn(pid->nr)]);
+ spin_unlock_irq(&pidmap_lock);
+
+out:
+ return pid;
+
+out_free:
+ kmem_cache_free(pid_cachep, pid);
+ pid = NULL;
+ goto out;
+}
+
+struct pid * fastcall find_pid(int nr)
{
struct hlist_node *elem;
struct pid *pid;
hlist_for_each_entry_rcu(pid, elem,
- &pid_hash[type][pid_hashfn(nr)], pid_chain) {
+ &pid_hash[pid_hashfn(nr)], pid_chain) {
if (pid->nr == nr)
return pid;
}
@@ -146,77 +220,82 @@ struct pid * fastcall find_pid(enum pid_type type, int nr)
int fastcall attach_pid(task_t *task, enum pid_type type, int nr)
{
- struct pid *pid, *task_pid;
-
- task_pid = &task->pids[type];
- pid = find_pid(type, nr);
- task_pid->nr = nr;
- if (pid == NULL) {
- INIT_LIST_HEAD(&task_pid->pid_list);
- hlist_add_head_rcu(&task_pid->pid_chain,
- &pid_hash[type][pid_hashfn(nr)]);
- } else {
- INIT_HLIST_NODE(&task_pid->pid_chain);
- list_add_tail_rcu(&task_pid->pid_list, &pid->pid_list);
- }
+ struct pid_link *link;
+ struct pid *pid;
+
+ WARN_ON(!task->pid); /* to be removed soon */
+ WARN_ON(!nr); /* to be removed soon */
+
+ link = &task->pids[type];
+ link->pid = pid = find_pid(nr);
+ hlist_add_head_rcu(&link->node, &pid->tasks[type]);
return 0;
}
-static fastcall int __detach_pid(task_t *task, enum pid_type type)
+void fastcall detach_pid(task_t *task, enum pid_type type)
{
- struct pid *pid, *pid_next;
- int nr = 0;
+ struct pid_link *link;
+ struct pid *pid;
+ int tmp;
- pid = &task->pids[type];
- if (!hlist_unhashed(&pid->pid_chain)) {
+ link = &task->pids[type];
+ pid = link->pid;
- if (list_empty(&pid->pid_list)) {
- nr = pid->nr;
- hlist_del_rcu(&pid->pid_chain);
- } else {
- pid_next = list_entry(pid->pid_list.next,
- struct pid, pid_list);
- /* insert next pid from pid_list to hash */
- hlist_replace_rcu(&pid->pid_chain,
- &pid_next->pid_chain);
- }
- }
+ hlist_del_rcu(&link->node);
+ link->pid = NULL;
- list_del_rcu(&pid->pid_list);
- pid->nr = 0;
+ for (tmp = PIDTYPE_MAX; --tmp >= 0; )
+ if (!hlist_empty(&pid->tasks[tmp]))
+ return;
- return nr;
+ free_pid(pid);
}
-void fastcall detach_pid(task_t *task, enum pid_type type)
+struct task_struct * fastcall pid_task(struct pid *pid, enum pid_type type)
{
- int tmp, nr;
+ struct task_struct *result = NULL;
+ if (pid) {
+ struct hlist_node *first;
+ first = rcu_dereference(pid->tasks[type].first);
+ if (first)
+ result = hlist_entry(first, struct task_struct, pids[(type)].node);
+ }
+ return result;
+}
- nr = __detach_pid(task, type);
- if (!nr)
- return;
+/*
+ * Must be called under rcu_read_lock() or with tasklist_lock read-held.
+ */
+task_t *find_task_by_pid_type(int type, int nr)
+{
+ return pid_task(find_pid(nr), type);
+}
- for (tmp = PIDTYPE_MAX; --tmp >= 0; )
- if (tmp != type && find_pid(tmp, nr))
- return;
+EXPORT_SYMBOL(find_task_by_pid_type);
- free_pidmap(nr);
+struct task_struct *fastcall get_pid_task(struct pid *pid, enum pid_type type)
+{
+ struct task_struct *result;
+ rcu_read_lock();
+ result = pid_task(pid, type);
+ if (result)
+ get_task_struct(result);
+ rcu_read_unlock();
+ return result;
}
-task_t *find_task_by_pid_type(int type, int nr)
+struct pid *find_get_pid(pid_t nr)
{
struct pid *pid;
- pid = find_pid(type, nr);
- if (!pid)
- return NULL;
+ rcu_read_lock();
+ pid = get_pid(find_pid(nr));
+ rcu_read_unlock();
- return pid_task(&pid->pid_list, type);
+ return pid;
}
-EXPORT_SYMBOL(find_task_by_pid_type);
-
/*
* The pid hash table is scaled according to the amount of memory in the
* machine. From a minimum of 16 slots up to 4096 slots at one gigabyte or
@@ -224,7 +303,7 @@ EXPORT_SYMBOL(find_task_by_pid_type);
*/
void __init pidhash_init(void)
{
- int i, j, pidhash_size;
+ int i, pidhash_size;
unsigned long megabytes = nr_kernel_pages >> (20 - PAGE_SHIFT);
pidhash_shift = max(4, fls(megabytes * 4));
@@ -233,16 +312,13 @@ void __init pidhash_init(void)
printk("PID hash table entries: %d (order: %d, %Zd bytes)\n",
pidhash_size, pidhash_shift,
- PIDTYPE_MAX * pidhash_size * sizeof(struct hlist_head));
-
- for (i = 0; i < PIDTYPE_MAX; i++) {
- pid_hash[i] = alloc_bootmem(pidhash_size *
- sizeof(*(pid_hash[i])));
- if (!pid_hash[i])
- panic("Could not alloc pidhash!\n");
- for (j = 0; j < pidhash_size; j++)
- INIT_HLIST_HEAD(&pid_hash[i][j]);
- }
+ pidhash_size * sizeof(struct hlist_head));
+
+ pid_hash = alloc_bootmem(pidhash_size * sizeof(*(pid_hash)));
+ if (!pid_hash)
+ panic("Could not alloc pidhash!\n");
+ for (i = 0; i < pidhash_size; i++)
+ INIT_HLIST_HEAD(&pid_hash[i]);
}
void __init pidmap_init(void)
@@ -251,4 +327,8 @@ void __init pidmap_init(void)
/* Reserve PID 0. We never call free_pidmap(0) */
set_bit(0, pidmap_array->page);
atomic_dec(&pidmap_array->nr_free);
+
+ pid_cachep = kmem_cache_create("pid", sizeof(struct pid),
+ __alignof__(struct pid),
+ SLAB_PANIC, NULL, NULL);
}