int nr, unsigned int gfp_mask)
{
struct ldlm_namespace *ns;
- int canceled = 0, unused;
+ int unused;
ns = ldlm_pl2ns(pl);
unused = ns->ns_nr_unused;
spin_unlock(&ns->ns_lock);
- if (nr) {
- canceled = ldlm_cancel_lru(ns, nr, LCF_ASYNC,
- LDLM_CANCEL_SHRINK);
- }
#ifdef __KERNEL__
- /*
- * Return the number of potentially reclaimable locks.
- */
- return ((unused - canceled) / 100) * sysctl_vfs_cache_pressure;
+ if (nr == 0)
+ return (unused / 100) * sysctl_vfs_cache_pressure;
+ else
+ return ldlm_cancel_lru(ns, nr, LCF_ASYNC, LDLM_CANCEL_SHRINK);
#else
- return unused - canceled;
+ return unused - (nr ? ldlm_cancel_lru(ns, nr, LCF_ASYNC,
+ LDLM_CANCEL_SHRINK) : 0);
#endif
}
static struct completion ldlm_pools_comp;
/*
- * Cancel \a nr locks from all namespaces (if possible). Returns number of
- * cached locks after shrink is finished. All namespaces are asked to
- * cancel approximately equal amount of locks to keep balancing.
- */
-static int ldlm_pools_shrink(ldlm_side_t client, int nr,
- unsigned int gfp_mask)
+* count locks from all namespaces (if possible). Returns number of
+* cached locks.
+*/
+static unsigned long ldlm_pools_count(ldlm_side_t client, unsigned int gfp_mask)
{
- unsigned int total = 0, cached = 0;
- int nr_ns;
- struct ldlm_namespace *ns;
+ int total = 0, nr_ns;
+ struct ldlm_namespace *ns;
struct ldlm_namespace *ns_old = NULL; /* loop detection */
- void *cookie;
+ void *cookie;
- if (client == LDLM_NAMESPACE_CLIENT && nr != 0 &&
- !(gfp_mask & __GFP_FS))
- return -1;
+ if (client == LDLM_NAMESPACE_CLIENT && !(gfp_mask & __GFP_FS))
+ return 0;
- CDEBUG(D_DLMTRACE, "Request to shrink %d %s locks from all pools\n",
- nr, client == LDLM_NAMESPACE_CLIENT ? "client" : "server");
+ CDEBUG(D_DLMTRACE, "Request to count %s locks from all pools\n",
+ client == LDLM_NAMESPACE_CLIENT ? "client" : "server");
- cookie = cl_env_reenter();
+ cookie = cl_env_reenter();
- /*
- * Find out how many resources we may release.
- */
+ /*
+ * Find out how many resources we may release.
+ */
for (nr_ns = ldlm_namespace_nr_read(client);
- nr_ns > 0; nr_ns--)
- {
+ nr_ns > 0; nr_ns--) {
mutex_lock(ldlm_namespace_lock(client));
- if (cfs_list_empty(ldlm_namespace_list(client))) {
+ if (list_empty(ldlm_namespace_list(client))) {
mutex_unlock(ldlm_namespace_lock(client));
- cl_env_reexit(cookie);
- return 0;
- }
- ns = ldlm_namespace_first_locked(client);
+ cl_env_reexit(cookie);
+ return 0;
+ }
+ ns = ldlm_namespace_first_locked(client);
if (ns == ns_old) {
mutex_unlock(ldlm_namespace_lock(client));
if (ns_old == NULL)
ns_old = ns;
- ldlm_namespace_get(ns);
- ldlm_namespace_move_to_active_locked(ns, client);
+ ldlm_namespace_get(ns);
+ ldlm_namespace_move_to_active_locked(ns, client);
mutex_unlock(ldlm_namespace_lock(client));
- total += ldlm_pool_shrink(&ns->ns_pool, 0, gfp_mask);
- ldlm_namespace_put(ns);
- }
+ total += ldlm_pool_shrink(&ns->ns_pool, 0, gfp_mask);
+ ldlm_namespace_put(ns);
+ }
- if (nr == 0 || total == 0) {
- cl_env_reexit(cookie);
- return total;
- }
+ cl_env_reexit(cookie);
+ return total;
+}
- /*
- * Shrink at least ldlm_namespace_nr(client) namespaces.
- */
- for (nr_ns = ldlm_namespace_nr_read(client) - nr_ns;
- nr_ns > 0; nr_ns--)
- {
- __u64 cancel;
- unsigned int nr_locks;
+static unsigned long ldlm_pools_scan(ldlm_side_t client, int nr,
+ unsigned int gfp_mask)
+{
+ unsigned long freed = 0;
+ int tmp, nr_ns;
+ struct ldlm_namespace *ns;
+ void *cookie;
- /*
- * Do not call shrink under ldlm_namespace_lock(client)
- */
+ if (client == LDLM_NAMESPACE_CLIENT && !(gfp_mask & __GFP_FS))
+ return -1;
+
+ cookie = cl_env_reenter();
+
+ /*
+ * Shrink at least ldlm_namespace_nr_read(client) namespaces.
+ */
+ for (tmp = nr_ns = ldlm_namespace_nr_read(client);
+ tmp > 0; tmp--) {
+ int cancel, nr_locks;
+
+ /*
+ * Do not call shrink under ldlm_namespace_lock(client)
+ */
mutex_lock(ldlm_namespace_lock(client));
- if (cfs_list_empty(ldlm_namespace_list(client))) {
+ if (list_empty(ldlm_namespace_list(client))) {
mutex_unlock(ldlm_namespace_lock(client));
- /*
- * If list is empty, we can't return any @cached > 0,
- * that probably would cause needless shrinker
- * call.
- */
- cached = 0;
- break;
- }
- ns = ldlm_namespace_first_locked(client);
- ldlm_namespace_get(ns);
- ldlm_namespace_move_to_active_locked(ns, client);
+ break;
+ }
+ ns = ldlm_namespace_first_locked(client);
+ ldlm_namespace_get(ns);
+ ldlm_namespace_move_to_active_locked(ns, client);
mutex_unlock(ldlm_namespace_lock(client));
- nr_locks = ldlm_pool_granted(&ns->ns_pool);
- cancel = (__u64)nr_locks * nr;
- do_div(cancel, total);
- ldlm_pool_shrink(&ns->ns_pool, 1 + cancel, gfp_mask);
- cached += ldlm_pool_granted(&ns->ns_pool);
- ldlm_namespace_put(ns);
- }
- cl_env_reexit(cookie);
- /* we only decrease the SLV in server pools shrinker, return -1 to
- * kernel to avoid needless loop. LU-1128 */
- return (client == LDLM_NAMESPACE_SERVER) ? -1 : cached;
+ nr_locks = ldlm_pool_granted(&ns->ns_pool);
+ /*
+ * We use to shrink propotionally but with new shrinker API,
+ * we lost the total number of freeable locks.
+ */
+ cancel = 1 + min_t(int, nr_locks, nr / nr_ns);
+ freed += ldlm_pool_shrink(&ns->ns_pool, cancel, gfp_mask);
+ ldlm_namespace_put(ns);
+ }
+ cl_env_reexit(cookie);
+ /*
+ * we only decrease the SLV in server pools shrinker, return
+ * SHRINK_STOP to kernel to avoid needless loop. LU-1128
+ */
+ return (client == LDLM_NAMESPACE_SERVER) ? SHRINK_STOP : freed;
+}
+
+#ifdef HAVE_SHRINKER_COUNT
+static unsigned long ldlm_pools_srv_count(struct shrinker *s,
+ struct shrink_control *sc)
+{
+ return ldlm_pools_count(LDLM_NAMESPACE_SERVER, sc->gfp_mask);
+}
+
+static unsigned long ldlm_pools_srv_scan(struct shrinker *s,
+ struct shrink_control *sc)
+{
+ return ldlm_pools_scan(LDLM_NAMESPACE_SERVER, sc->nr_to_scan,
+ sc->gfp_mask);
+}
+
+static unsigned long ldlm_pools_cli_count(struct shrinker *s, struct shrink_control *sc)
+{
+ return ldlm_pools_count(LDLM_NAMESPACE_CLIENT, sc->gfp_mask);
+}
+
+static unsigned long ldlm_pools_cli_scan(struct shrinker *s,
+ struct shrink_control *sc)
+{
+ return ldlm_pools_scan(LDLM_NAMESPACE_CLIENT, sc->nr_to_scan,
+ sc->gfp_mask);
+}
+
+#else
+/*
+ * Cancel \a nr locks from all namespaces (if possible). Returns number of
+ * cached locks after shrink is finished. All namespaces are asked to
+ * cancel approximately equal amount of locks to keep balancing.
+ */
+static int ldlm_pools_shrink(ldlm_side_t client, int nr,
+ unsigned int gfp_mask)
+{
+ unsigned int total = 0;
+
+ if (client == LDLM_NAMESPACE_CLIENT && nr != 0 &&
+ !(gfp_mask & __GFP_FS))
+ return -1;
+
+ CDEBUG(D_DLMTRACE, "Request to shrink %d %s locks from all pools\n",
+ nr, client == LDLM_NAMESPACE_CLIENT ? "client" : "server");
+
+ total = ldlm_pools_count(client, gfp_mask);
+
+ if (nr == 0 || total == 0)
+ return total;
+
+ return ldlm_pools_scan(client, nr, gfp_mask);
}
static int ldlm_pools_srv_shrink(SHRINKER_ARGS(sc, nr_to_scan, gfp_mask))
shrink_param(sc, gfp_mask));
}
+#endif /* HAVE_SHRINKER_COUNT */
+
int ldlm_pools_recalc(ldlm_side_t client)
{
__u32 nr_l = 0, nr_p = 0, l;
int ldlm_pools_init(void)
{
int rc;
+ DEF_SHRINKER_VAR(shsvar, ldlm_pools_srv_shrink,
+ ldlm_pools_srv_count, ldlm_pools_srv_scan);
+ DEF_SHRINKER_VAR(shcvar, ldlm_pools_cli_shrink,
+ ldlm_pools_cli_count, ldlm_pools_cli_scan);
ENTRY;
rc = ldlm_pools_thread_start();
if (rc == 0) {
ldlm_pools_srv_shrinker =
- set_shrinker(DEFAULT_SEEKS,
- ldlm_pools_srv_shrink);
+ set_shrinker(DEFAULT_SEEKS, &shsvar);
ldlm_pools_cli_shrinker =
- set_shrinker(DEFAULT_SEEKS,
- ldlm_pools_cli_shrink);
+ set_shrinker(DEFAULT_SEEKS, &shcvar);
}
RETURN(rc);
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff