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path: root/drivers/staging/lustre/lustre/obdclass/cl_object.c
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Diffstat (limited to 'drivers/staging/lustre/lustre/obdclass/cl_object.c')
-rw-r--r--drivers/staging/lustre/lustre/obdclass/cl_object.c303
1 files changed, 223 insertions, 80 deletions
diff --git a/drivers/staging/lustre/lustre/obdclass/cl_object.c b/drivers/staging/lustre/lustre/obdclass/cl_object.c
index 43e299d4d416..5940f30318ec 100644
--- a/drivers/staging/lustre/lustre/obdclass/cl_object.c
+++ b/drivers/staging/lustre/lustre/obdclass/cl_object.c
@@ -36,6 +36,7 @@
* Client Lustre Object.
*
* Author: Nikita Danilov <nikita.danilov@sun.com>
+ * Author: Jinshan Xiong <jinshan.xiong@intel.com>
*/
/*
@@ -43,8 +44,6 @@
*
* i_mutex
* PG_locked
- * ->coh_page_guard
- * ->coh_lock_guard
* ->coh_attr_guard
* ->ls_guard
*/
@@ -63,10 +62,6 @@
static struct kmem_cache *cl_env_kmem;
-/** Lock class of cl_object_header::coh_page_guard */
-static struct lock_class_key cl_page_guard_class;
-/** Lock class of cl_object_header::coh_lock_guard */
-static struct lock_class_key cl_lock_guard_class;
/** Lock class of cl_object_header::coh_attr_guard */
static struct lock_class_key cl_attr_guard_class;
@@ -81,17 +76,9 @@ int cl_object_header_init(struct cl_object_header *h)
result = lu_object_header_init(&h->coh_lu);
if (result == 0) {
- spin_lock_init(&h->coh_page_guard);
- spin_lock_init(&h->coh_lock_guard);
spin_lock_init(&h->coh_attr_guard);
- lockdep_set_class(&h->coh_page_guard, &cl_page_guard_class);
- lockdep_set_class(&h->coh_lock_guard, &cl_lock_guard_class);
lockdep_set_class(&h->coh_attr_guard, &cl_attr_guard_class);
- h->coh_pages = 0;
- /* XXX hard coded GFP_* mask. */
- INIT_RADIX_TREE(&h->coh_tree, GFP_ATOMIC);
- INIT_LIST_HEAD(&h->coh_locks);
- h->coh_page_bufsize = ALIGN(sizeof(struct cl_page), 8);
+ h->coh_page_bufsize = 0;
}
return result;
}
@@ -145,7 +132,7 @@ EXPORT_SYMBOL(cl_object_get);
/**
* Returns the top-object for a given \a o.
*
- * \see cl_page_top(), cl_io_top()
+ * \see cl_io_top()
*/
struct cl_object *cl_object_top(struct cl_object *o)
{
@@ -315,6 +302,29 @@ int cl_conf_set(const struct lu_env *env, struct cl_object *obj,
EXPORT_SYMBOL(cl_conf_set);
/**
+ * Prunes caches of pages and locks for this object.
+ */
+int cl_object_prune(const struct lu_env *env, struct cl_object *obj)
+{
+ struct lu_object_header *top;
+ struct cl_object *o;
+ int result;
+
+ top = obj->co_lu.lo_header;
+ result = 0;
+ list_for_each_entry(o, &top->loh_layers, co_lu.lo_linkage) {
+ if (o->co_ops->coo_prune) {
+ result = o->co_ops->coo_prune(env, o);
+ if (result != 0)
+ break;
+ }
+ }
+
+ return result;
+}
+EXPORT_SYMBOL(cl_object_prune);
+
+/**
* Helper function removing all object locks, and marking object for
* deletion. All object pages must have been deleted at this point.
*
@@ -323,34 +333,12 @@ EXPORT_SYMBOL(cl_conf_set);
*/
void cl_object_kill(const struct lu_env *env, struct cl_object *obj)
{
- struct cl_object_header *hdr;
-
- hdr = cl_object_header(obj);
- LASSERT(!hdr->coh_tree.rnode);
- LASSERT(hdr->coh_pages == 0);
+ struct cl_object_header *hdr = cl_object_header(obj);
set_bit(LU_OBJECT_HEARD_BANSHEE, &hdr->coh_lu.loh_flags);
- /*
- * Destroy all locks. Object destruction (including cl_inode_fini())
- * cannot cancel the locks, because in the case of a local client,
- * where client and server share the same thread running
- * prune_icache(), this can dead-lock with ldlm_cancel_handler()
- * waiting on __wait_on_freeing_inode().
- */
- cl_locks_prune(env, obj, 0);
}
EXPORT_SYMBOL(cl_object_kill);
-/**
- * Prunes caches of pages and locks for this object.
- */
-void cl_object_prune(const struct lu_env *env, struct cl_object *obj)
-{
- cl_pages_prune(env, obj);
- cl_locks_prune(env, obj, 1);
-}
-EXPORT_SYMBOL(cl_object_prune);
-
void cache_stats_init(struct cache_stats *cs, const char *name)
{
int i;
@@ -383,6 +371,8 @@ static int cache_stats_print(const struct cache_stats *cs,
return 0;
}
+static void cl_env_percpu_refill(void);
+
/**
* Initialize client site.
*
@@ -397,11 +387,9 @@ int cl_site_init(struct cl_site *s, struct cl_device *d)
result = lu_site_init(&s->cs_lu, &d->cd_lu_dev);
if (result == 0) {
cache_stats_init(&s->cs_pages, "pages");
- cache_stats_init(&s->cs_locks, "locks");
for (i = 0; i < ARRAY_SIZE(s->cs_pages_state); ++i)
atomic_set(&s->cs_pages_state[0], 0);
- for (i = 0; i < ARRAY_SIZE(s->cs_locks_state); ++i)
- atomic_set(&s->cs_locks_state[i], 0);
+ cl_env_percpu_refill();
}
return result;
}
@@ -435,15 +423,6 @@ int cl_site_stats_print(const struct cl_site *site, struct seq_file *m)
[CPS_PAGEIN] = "r",
[CPS_FREEING] = "f"
};
- static const char *lstate[] = {
- [CLS_NEW] = "n",
- [CLS_QUEUING] = "q",
- [CLS_ENQUEUED] = "e",
- [CLS_HELD] = "h",
- [CLS_INTRANSIT] = "t",
- [CLS_CACHED] = "c",
- [CLS_FREEING] = "f"
- };
/*
lookup hit total busy create
pages: ...... ...... ...... ...... ...... [...... ...... ...... ......]
@@ -457,12 +436,6 @@ locks: ...... ...... ...... ...... ...... [...... ...... ...... ...... ......]
seq_printf(m, "%s: %u ", pstate[i],
atomic_read(&site->cs_pages_state[i]));
seq_printf(m, "]\n");
- cache_stats_print(&site->cs_locks, m, 0);
- seq_printf(m, " [");
- for (i = 0; i < ARRAY_SIZE(site->cs_locks_state); ++i)
- seq_printf(m, "%s: %u ", lstate[i],
- atomic_read(&site->cs_locks_state[i]));
- seq_printf(m, "]\n");
cache_stats_print(&cl_env_stats, m, 0);
seq_printf(m, "\n");
return 0;
@@ -492,6 +465,13 @@ EXPORT_SYMBOL(cl_site_stats_print);
* bz20044, bz22683.
*/
+static LIST_HEAD(cl_envs);
+static unsigned int cl_envs_cached_nr;
+static unsigned int cl_envs_cached_max = 128; /* XXX: prototype: arbitrary limit
+ * for now.
+ */
+static DEFINE_SPINLOCK(cl_envs_guard);
+
struct cl_env {
void *ce_magic;
struct lu_env ce_lu;
@@ -674,8 +654,9 @@ static struct lu_env *cl_env_new(__u32 ctx_tags, __u32 ses_tags, void *debug)
lu_context_enter(&cle->ce_ses);
env->le_ses = &cle->ce_ses;
cl_env_init0(cle, debug);
- } else
+ } else {
lu_env_fini(env);
+ }
}
if (rc != 0) {
kmem_cache_free(cl_env_kmem, cle);
@@ -684,8 +665,9 @@ static struct lu_env *cl_env_new(__u32 ctx_tags, __u32 ses_tags, void *debug)
CL_ENV_INC(create);
CL_ENV_INC(total);
}
- } else
+ } else {
env = ERR_PTR(-ENOMEM);
+ }
return env;
}
@@ -697,6 +679,39 @@ static void cl_env_fini(struct cl_env *cle)
kmem_cache_free(cl_env_kmem, cle);
}
+static struct lu_env *cl_env_obtain(void *debug)
+{
+ struct cl_env *cle;
+ struct lu_env *env;
+
+ spin_lock(&cl_envs_guard);
+ LASSERT(equi(cl_envs_cached_nr == 0, list_empty(&cl_envs)));
+ if (cl_envs_cached_nr > 0) {
+ int rc;
+
+ cle = container_of(cl_envs.next, struct cl_env, ce_linkage);
+ list_del_init(&cle->ce_linkage);
+ cl_envs_cached_nr--;
+ spin_unlock(&cl_envs_guard);
+
+ env = &cle->ce_lu;
+ rc = lu_env_refill(env);
+ if (rc == 0) {
+ cl_env_init0(cle, debug);
+ lu_context_enter(&env->le_ctx);
+ lu_context_enter(&cle->ce_ses);
+ } else {
+ cl_env_fini(cle);
+ env = ERR_PTR(rc);
+ }
+ } else {
+ spin_unlock(&cl_envs_guard);
+ env = cl_env_new(lu_context_tags_default,
+ lu_session_tags_default, debug);
+ }
+ return env;
+}
+
static inline struct cl_env *cl_env_container(struct lu_env *env)
{
return container_of(env, struct cl_env, ce_lu);
@@ -727,6 +742,8 @@ static struct lu_env *cl_env_peek(int *refcheck)
* Returns lu_env: if there already is an environment associated with the
* current thread, it is returned, otherwise, new environment is allocated.
*
+ * Allocations are amortized through the global cache of environments.
+ *
* \param refcheck pointer to a counter used to detect environment leaks. In
* the usual case cl_env_get() and cl_env_put() are called in the same lexical
* scope and pointer to the same integer is passed as \a refcheck. This is
@@ -740,10 +757,7 @@ struct lu_env *cl_env_get(int *refcheck)
env = cl_env_peek(refcheck);
if (!env) {
- env = cl_env_new(lu_context_tags_default,
- lu_session_tags_default,
- __builtin_return_address(0));
-
+ env = cl_env_obtain(__builtin_return_address(0));
if (!IS_ERR(env)) {
struct cl_env *cle;
@@ -787,6 +801,32 @@ static void cl_env_exit(struct cl_env *cle)
}
/**
+ * Finalizes and frees a given number of cached environments. This is done to
+ * (1) free some memory (not currently hooked into VM), or (2) release
+ * references to modules.
+ */
+unsigned int cl_env_cache_purge(unsigned int nr)
+{
+ struct cl_env *cle;
+
+ spin_lock(&cl_envs_guard);
+ for (; !list_empty(&cl_envs) && nr > 0; --nr) {
+ cle = container_of(cl_envs.next, struct cl_env, ce_linkage);
+ list_del_init(&cle->ce_linkage);
+ LASSERT(cl_envs_cached_nr > 0);
+ cl_envs_cached_nr--;
+ spin_unlock(&cl_envs_guard);
+
+ cl_env_fini(cle);
+ spin_lock(&cl_envs_guard);
+ }
+ LASSERT(equi(cl_envs_cached_nr == 0, list_empty(&cl_envs)));
+ spin_unlock(&cl_envs_guard);
+ return nr;
+}
+EXPORT_SYMBOL(cl_env_cache_purge);
+
+/**
* Release an environment.
*
* Decrement \a env reference counter. When counter drops to 0, nothing in
@@ -808,7 +848,22 @@ void cl_env_put(struct lu_env *env, int *refcheck)
cl_env_detach(cle);
cle->ce_debug = NULL;
cl_env_exit(cle);
- cl_env_fini(cle);
+ /*
+ * Don't bother to take a lock here.
+ *
+ * Return environment to the cache only when it was allocated
+ * with the standard tags.
+ */
+ if (cl_envs_cached_nr < cl_envs_cached_max &&
+ (env->le_ctx.lc_tags & ~LCT_HAS_EXIT) == LCT_CL_THREAD &&
+ (env->le_ses->lc_tags & ~LCT_HAS_EXIT) == LCT_SESSION) {
+ spin_lock(&cl_envs_guard);
+ list_add(&cle->ce_linkage, &cl_envs);
+ cl_envs_cached_nr++;
+ spin_unlock(&cl_envs_guard);
+ } else {
+ cl_env_fini(cle);
+ }
}
}
EXPORT_SYMBOL(cl_env_put);
@@ -914,6 +969,104 @@ void cl_lvb2attr(struct cl_attr *attr, const struct ost_lvb *lvb)
}
EXPORT_SYMBOL(cl_lvb2attr);
+static struct cl_env cl_env_percpu[NR_CPUS];
+
+static int cl_env_percpu_init(void)
+{
+ struct cl_env *cle;
+ int tags = LCT_REMEMBER | LCT_NOREF;
+ int i, j;
+ int rc = 0;
+
+ for_each_possible_cpu(i) {
+ struct lu_env *env;
+
+ cle = &cl_env_percpu[i];
+ env = &cle->ce_lu;
+
+ INIT_LIST_HEAD(&cle->ce_linkage);
+ cle->ce_magic = &cl_env_init0;
+ rc = lu_env_init(env, LCT_CL_THREAD | tags);
+ if (rc == 0) {
+ rc = lu_context_init(&cle->ce_ses, LCT_SESSION | tags);
+ if (rc == 0) {
+ lu_context_enter(&cle->ce_ses);
+ env->le_ses = &cle->ce_ses;
+ } else {
+ lu_env_fini(env);
+ }
+ }
+ if (rc != 0)
+ break;
+ }
+ if (rc != 0) {
+ /* Indices 0 to i (excluding i) were correctly initialized,
+ * thus we must uninitialize up to i, the rest are undefined.
+ */
+ for (j = 0; j < i; j++) {
+ cle = &cl_env_percpu[i];
+ lu_context_exit(&cle->ce_ses);
+ lu_context_fini(&cle->ce_ses);
+ lu_env_fini(&cle->ce_lu);
+ }
+ }
+
+ return rc;
+}
+
+static void cl_env_percpu_fini(void)
+{
+ int i;
+
+ for_each_possible_cpu(i) {
+ struct cl_env *cle = &cl_env_percpu[i];
+
+ lu_context_exit(&cle->ce_ses);
+ lu_context_fini(&cle->ce_ses);
+ lu_env_fini(&cle->ce_lu);
+ }
+}
+
+static void cl_env_percpu_refill(void)
+{
+ int i;
+
+ for_each_possible_cpu(i)
+ lu_env_refill(&cl_env_percpu[i].ce_lu);
+}
+
+void cl_env_percpu_put(struct lu_env *env)
+{
+ struct cl_env *cle;
+ int cpu;
+
+ cpu = smp_processor_id();
+ cle = cl_env_container(env);
+ LASSERT(cle == &cl_env_percpu[cpu]);
+
+ cle->ce_ref--;
+ LASSERT(cle->ce_ref == 0);
+
+ CL_ENV_DEC(busy);
+ cl_env_detach(cle);
+ cle->ce_debug = NULL;
+
+ put_cpu();
+}
+EXPORT_SYMBOL(cl_env_percpu_put);
+
+struct lu_env *cl_env_percpu_get(void)
+{
+ struct cl_env *cle;
+
+ cle = &cl_env_percpu[get_cpu()];
+ cl_env_init0(cle, __builtin_return_address(0));
+
+ cl_env_attach(cle);
+ return &cle->ce_lu;
+}
+EXPORT_SYMBOL(cl_env_percpu_get);
+
/*****************************************************************************
*
* Temporary prototype thing: mirror obd-devices into cl devices.
@@ -944,8 +1097,9 @@ struct cl_device *cl_type_setup(const struct lu_env *env, struct lu_site *site,
CERROR("can't init device '%s', %d\n", typename, rc);
d = ERR_PTR(rc);
}
- } else
+ } else {
CERROR("Cannot allocate device: '%s'\n", typename);
+ }
return lu2cl_dev(d);
}
EXPORT_SYMBOL(cl_type_setup);
@@ -959,12 +1113,6 @@ void cl_stack_fini(const struct lu_env *env, struct cl_device *cl)
}
EXPORT_SYMBOL(cl_stack_fini);
-int cl_lock_init(void);
-void cl_lock_fini(void);
-
-int cl_page_init(void);
-void cl_page_fini(void);
-
static struct lu_context_key cl_key;
struct cl_thread_info *cl_env_info(const struct lu_env *env)
@@ -1059,17 +1207,13 @@ int cl_global_init(void)
if (result)
goto out_kmem;
- result = cl_lock_init();
+ result = cl_env_percpu_init();
if (result)
+ /* no cl_env_percpu_fini on error */
goto out_context;
- result = cl_page_init();
- if (result)
- goto out_lock;
-
return 0;
-out_lock:
- cl_lock_fini();
+
out_context:
lu_context_key_degister(&cl_key);
out_kmem:
@@ -1084,8 +1228,7 @@ out_store:
*/
void cl_global_fini(void)
{
- cl_lock_fini();
- cl_page_fini();
+ cl_env_percpu_fini();
lu_context_key_degister(&cl_key);
lu_kmem_fini(cl_object_caches);
cl_env_store_fini();
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