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shm: trace the amount of locked segment per user

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NAKAMURA Gou
2016-03-10 20:45:57 +09:00
parent 8b5b075f4c
commit e8be52a1ff
3 changed files with 107 additions and 2 deletions
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50
kernel/shmobj.c
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@@ -112,6 +112,43 @@ void shmobj_list_unlock(void)
return;
}
/***********************************************************************
* shmlock_users
*/
ihk_spinlock_t shmlock_users_lock_body = SPIN_LOCK_UNLOCKED;
static LIST_HEAD(shmlock_users);
void shmlock_user_free(struct shmlock_user *user)
{
if (user->locked) {
panic("shmlock_user_free()");
}
list_del(&user->chain);
kfree(user);
}
int shmlock_user_get(uid_t ruid, struct shmlock_user **userp)
{
struct shmlock_user *user;
list_for_each_entry(user, &shmlock_users, chain) {
if (user->ruid == ruid) {
break;
}
}
if (&user->chain == &shmlock_users) {
user = kmalloc(sizeof(*user), IHK_MC_AP_NOWAIT);
if (!user) {
return -ENOMEM;
}
user->ruid = ruid;
user->locked = 0;
list_add(&user->chain, &shmlock_users);
}
*userp = user;
return 0;
}
/***********************************************************************
* operations
*/
@@ -172,8 +209,21 @@ void shmobj_destroy(struct shmobj *obj)
extern struct shm_info the_shm_info;
extern struct list_head kds_free_list;
extern int the_maxi;
struct shmlock_user *user;
size_t size;
dkprintf("shmobj_destroy(%p [%d %o])\n", obj, obj->index, obj->ds.shm_perm.mode);
if (obj->user) {
user = obj->user;
obj->user = NULL;
shmlock_users_lock();
size = (obj->ds.shm_segsz + PAGE_SIZE - 1) & PAGE_MASK;
user->locked -= size;
if (!user->locked) {
shmlock_user_free(user);
}
shmlock_users_unlock();
}
/* zap page_list */
for (;;) {
struct page *page;