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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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32
kernel/syscall.c
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@ -3783,6 +3783,9 @@ SYSCALL_DECLARE(shmctl)
int req;
int maxi;
struct shmobj *obj;
size_t size;
struct shmlock_user *user;
uid_t ruid = proc->ruid;
dkprintf("shmctl(%#x,%d,%p)\n", shmid, cmd, buf);
if (0) ;
@ -3909,7 +3912,21 @@ SYSCALL_DECLARE(shmctl)
dkprintf("shmctl(%#x,%d,%p): lookup: %d\n", shmid, cmd, buf, error);
return error;
}
obj->ds.shm_perm.mode |= SHM_LOCKED;
if (!(obj->ds.shm_perm.mode & SHM_LOCKED)) {
shmlock_users_lock();
error = shmlock_user_get(ruid, &user);
if (error) {
shmlock_users_unlock();
shmobj_list_unlock();
ekprintf("shmctl(%#x,%d,%p): user lookup: %d\n", shmid, cmd, buf, error);
return -ENOMEM;
}
size = (obj->ds.shm_segsz + PAGE_SIZE - 1) & PAGE_MASK;
obj->ds.shm_perm.mode |= SHM_LOCKED;
obj->user = user;
user->locked += size;
shmlock_users_unlock();
}
shmobj_list_unlock();
dkprintf("shmctl(%#x,%d,%p): 0\n", shmid, cmd, buf);
@ -3923,7 +3940,18 @@ SYSCALL_DECLARE(shmctl)
dkprintf("shmctl(%#x,%d,%p): lookup: %d\n", shmid, cmd, buf, error);
return error;
}
obj->ds.shm_perm.mode &= ~SHM_LOCKED;
if (obj->ds.shm_perm.mode & SHM_LOCKED) {
size = (obj->ds.shm_segsz + PAGE_SIZE - 1) & PAGE_MASK;
shmlock_users_lock();
user = obj->user;
obj->user = NULL;
user->locked -= size;
if (!user->locked) {
shmlock_user_free(user);
}
shmlock_users_unlock();
obj->ds.shm_perm.mode &= ~SHM_LOCKED;
}
shmobj_list_unlock();
dkprintf("shmctl(%#x,%d,%p): 0\n", shmid, cmd, buf);
return 0;