}
/**
- * Callback function for shrink policy. Makes decision whether to keep
- * \a lock in LRU for current \a LRU size \a unused, added in current scan
- * \a added and number of locks to be preferably canceled \a count.
- *
- * \retval LDLM_POLICY_KEEP_LOCK keep lock in LRU in stop scanning
- *
- * \retval LDLM_POLICY_CANCEL_LOCK cancel lock from LRU
- */
-static ldlm_policy_res_t ldlm_cancel_shrink_policy(struct ldlm_namespace *ns,
- struct ldlm_lock *lock,
- int unused, int added,
- int count)
-{
- int lock_cost;
- __u64 page_nr;
-
- /*
- * Stop lru processing when we reached passed @count or checked all
- * locks in lru.
- */
- if (count && added >= count)
- return LDLM_POLICY_KEEP_LOCK;
-
- if (lock->l_resource->lr_type == LDLM_EXTENT) {
- if (lock->l_weigh_ast) {
- /*
- * For liblustre, l_weigh_ast should return 0 since it
- * don't cache pages
- */
- page_nr = lock->l_weigh_ast(lock);
- } else {
- struct ldlm_extent *l_extent;
-
- /*
- * For all extent locks cost is 1 + number of pages in
- * their extent.
- */
- l_extent = &lock->l_policy_data.l_extent;
- page_nr = l_extent->end - l_extent->start;
- do_div(page_nr, CFS_PAGE_SIZE);
- }
- lock_cost = 1 + page_nr;
- } else {
- /*
- * For all locks which are not extent ones cost is 1
- */
- lock_cost = 1;
- }
-
- /*
- * Keep all expensive locks in lru for the memory pressure time
- * cancel policy. They anyways may be canceled by lru resize
- * pplicy if they have not small enough CLV.
- */
- return lock_cost > ns->ns_shrink_thumb ?
- LDLM_POLICY_KEEP_LOCK : LDLM_POLICY_CANCEL_LOCK;
-}
-
-/**
* Callback function for lru-resize policy. Makes decision whether to keep
* \a lock in LRU for current \a LRU size \a unused, added in current scan
* \a added and number of locks to be preferably canceled \a count.
{
if (ns_connect_lru_resize(ns)) {
if (flags & LDLM_CANCEL_SHRINK)
- return ldlm_cancel_shrink_policy;
+ /* We kill passed number of old locks. */
+ return ldlm_cancel_passed_policy;
else if (flags & LDLM_CANCEL_LRUR)
return ldlm_cancel_lrur_policy;
else if (flags & LDLM_CANCEL_PASSED)
RETURN(ldlm_cancel_list(cancels, added, cancel_flags));
}
-/* Returns number of locks which could be canceled next time when
- * ldlm_cancel_lru() is called. Used from locks pool shrinker. */
-int ldlm_cancel_lru_estimate(struct ldlm_namespace *ns,
- int count, int max, int flags)
-{
- struct list_head disp = CFS_LIST_HEAD_INIT(disp);
- ldlm_cancel_lru_policy_t pf;
- struct ldlm_lock *lock;
- int added = 0, unused;
- int loop_stop = 0;
- ENTRY;
-
- pf = ldlm_cancel_lru_policy(ns, flags);
- LASSERT(pf != NULL);
- spin_lock(&ns->ns_unused_lock);
- unused = ns->ns_nr_unused;
- list_splice_init(&ns->ns_unused_list, &disp);
- while (!list_empty(&disp)) {
- lock = list_entry(disp.next, struct ldlm_lock, l_lru);
- list_move_tail(&lock->l_lru, &ns->ns_unused_list);
-
- /* For any flags, stop scanning if @max is reached. */
- if (max && added >= max)
- break;
-
- /* Somebody is already doing CANCEL or there is a
- * blocking request will send cancel. Let's not count
- * this lock. */
- if ((lock->l_flags & LDLM_FL_CANCELING) ||
- (lock->l_flags & LDLM_FL_BL_AST))
- continue;
-
- LDLM_LOCK_GET(lock);
- spin_unlock(&ns->ns_unused_lock);
- lu_ref_add(&lock->l_reference, __FUNCTION__, cfs_current());
-
- /* Pass the lock through the policy filter and see if it
- * should stay in lru. */
- if (pf(ns, lock, unused, added, count) == LDLM_POLICY_KEEP_LOCK)
- loop_stop = 1;
-
- lu_ref_del(&lock->l_reference, __FUNCTION__, cfs_current());
- LDLM_LOCK_RELEASE(lock);
- spin_lock(&ns->ns_unused_lock);
- if (loop_stop)
- break;
-
- added++;
- unused--;
- }
- list_splice(&disp, ns->ns_unused_list.prev);
- spin_unlock(&ns->ns_unused_lock);
- RETURN(added);
-}
-
/* when called with LDLM_ASYNC the blocking callback will be handled
* in a thread and this function will return after the thread has been
* asked to call the callback. when called with LDLM_SYNC the blocking
RETURN(count);
}
- /* If an error occured in ASYNC mode, or
- * this is SYNC mode, cancel the list. */
+ /* If an error occured in ASYNC mode, or this is SYNC mode,
+ * cancel the list. */
ldlm_cli_cancel_list(&cancels, count, NULL, 0);
RETURN(count);
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff