* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
- * Copyright (c) 2011, 2012, Intel Corporation.
+ * Copyright (c) 2011, 2013, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
#include <cl_object.h>
#include "cl_internal.h"
-static cfs_mem_cache_t *cl_env_kmem;
+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;
struct cl_device *cd, const struct lu_fid *fid,
const struct cl_object_conf *c)
{
- cfs_might_sleep();
+ might_sleep();
return lu2cl(lu_object_find_slice(env, cl2lu_dev(cd), fid, &c->coc_lu));
}
EXPORT_SYMBOL(cl_object_find);
int cl_object_attr_get(const struct lu_env *env, struct cl_object *obj,
struct cl_attr *attr)
{
- struct lu_object_header *top;
- int result;
+ struct lu_object_header *top;
+ int result;
- LASSERT_SPIN_LOCKED(cl_object_attr_guard(obj));
- ENTRY;
+ LASSERT(spin_is_locked(cl_object_attr_guard(obj)));
+ ENTRY;
top = obj->co_lu.lo_header;
result = 0;
int cl_object_attr_set(const struct lu_env *env, struct cl_object *obj,
const struct cl_attr *attr, unsigned v)
{
- struct lu_object_header *top;
- int result;
+ struct lu_object_header *top;
+ int result;
- LASSERT_SPIN_LOCKED(cl_object_attr_guard(obj));
- ENTRY;
+ LASSERT(spin_is_locked(cl_object_attr_guard(obj)));
+ ENTRY;
top = obj->co_lu.lo_header;
result = 0;
* bz20044, bz22683.
*/
+static CFS_LIST_HEAD(cl_envs);
+static unsigned cl_envs_cached_nr = 0;
+static unsigned 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;
*/
cfs_hlist_node_t ce_node;
#endif
- /**
- * Owner for the current cl_env.
- *
- * If LL_TASK_CL_ENV is defined, this point to the owning cfs_current(),
- * only for debugging purpose ;
- * Otherwise hash is used, and this is the key for cfs_hash.
- * Now current thread pid is stored. Note using thread pointer would
- * lead to unbalanced hash because of its specific allocation locality
- * and could be varied for different platforms and OSes, even different
- * OS versions.
- */
- void *ce_owner;
+ /**
+ * Owner for the current cl_env.
+ *
+ * If LL_TASK_CL_ENV is defined, this point to the owning current,
+ * only for debugging purpose ;
+ * Otherwise hash is used, and this is the key for cfs_hash.
+ * Now current thread pid is stored. Note using thread pointer would
+ * lead to unbalanced hash because of its specific allocation locality
+ * and could be varied for different platforms and OSes, even different
+ * OS versions.
+ */
+ void *ce_owner;
/*
* Linkage into global list of all client environments. Used for
static inline struct cl_env *cl_env_fetch(void)
{
- struct cl_env *cle;
+ struct cl_env *cle;
- cle = cfs_hash_lookup(cl_env_hash, (void *) (long) cfs_current()->pid);
- LASSERT(ergo(cle, cle->ce_magic == &cl_env_init0));
- return cle;
+ cle = cfs_hash_lookup(cl_env_hash, (void *) (long) current->pid);
+ LASSERT(ergo(cle, cle->ce_magic == &cl_env_init0));
+ return cle;
}
static inline void cl_env_attach(struct cl_env *cle)
{
- if (cle) {
- int rc;
-
- LASSERT(cle->ce_owner == NULL);
- cle->ce_owner = (void *) (long) cfs_current()->pid;
- rc = cfs_hash_add_unique(cl_env_hash, cle->ce_owner,
- &cle->ce_node);
- LASSERT(rc == 0);
- }
+ if (cle) {
+ int rc;
+
+ LASSERT(cle->ce_owner == NULL);
+ cle->ce_owner = (void *) (long) current->pid;
+ rc = cfs_hash_add_unique(cl_env_hash, cle->ce_owner,
+ &cle->ce_node);
+ LASSERT(rc == 0);
+ }
}
static inline void cl_env_do_detach(struct cl_env *cle)
{
- void *cookie;
+ void *cookie;
- LASSERT(cle->ce_owner == (void *) (long) cfs_current()->pid);
- cookie = cfs_hash_del(cl_env_hash, cle->ce_owner,
- &cle->ce_node);
- LASSERT(cookie == cle);
- cle->ce_owner = NULL;
+ LASSERT(cle->ce_owner == (void *) (long) current->pid);
+ cookie = cfs_hash_del(cl_env_hash, cle->ce_owner,
+ &cle->ce_node);
+ LASSERT(cookie == cle);
+ cle->ce_owner = NULL;
}
static int cl_env_store_init(void) {
static inline struct cl_env *cl_env_fetch(void)
{
- struct cl_env *cle;
+ struct cl_env *cle;
- cle = cfs_current()->LL_TASK_CL_ENV;
- if (cle && cle->ce_magic != &cl_env_init0)
- cle = NULL;
- return cle;
+ cle = current->LL_TASK_CL_ENV;
+ if (cle && cle->ce_magic != &cl_env_init0)
+ cle = NULL;
+ return cle;
}
static inline void cl_env_attach(struct cl_env *cle)
{
- if (cle) {
- LASSERT(cle->ce_owner == NULL);
- cle->ce_owner = cfs_current();
- cle->ce_prev = cfs_current()->LL_TASK_CL_ENV;
- cfs_current()->LL_TASK_CL_ENV = cle;
- }
+ if (cle) {
+ LASSERT(cle->ce_owner == NULL);
+ cle->ce_owner = current;
+ cle->ce_prev = current->LL_TASK_CL_ENV;
+ current->LL_TASK_CL_ENV = cle;
+ }
}
static inline void cl_env_do_detach(struct cl_env *cle)
{
- LASSERT(cle->ce_owner == cfs_current());
- LASSERT(cfs_current()->LL_TASK_CL_ENV == cle);
- cfs_current()->LL_TASK_CL_ENV = cle->ce_prev;
- cle->ce_owner = NULL;
+ LASSERT(cle->ce_owner == current);
+ LASSERT(current->LL_TASK_CL_ENV == cle);
+ current->LL_TASK_CL_ENV = cle->ce_prev;
+ cle->ce_owner = NULL;
}
static int cl_env_store_init(void) { return 0; }
struct lu_env *env;
struct cl_env *cle;
- OBD_SLAB_ALLOC_PTR_GFP(cle, cl_env_kmem, CFS_ALLOC_IO);
+ OBD_SLAB_ALLOC_PTR_GFP(cle, cl_env_kmem, __GFP_IO);
if (cle != NULL) {
int rc;
OBD_SLAB_FREE_PTR(cle, cl_env_kmem);
}
+static struct lu_env *cl_env_obtain(void *debug)
+{
+ struct cl_env *cle;
+ struct lu_env *env;
+
+ ENTRY;
+ spin_lock(&cl_envs_guard);
+ LASSERT(equi(cl_envs_cached_nr == 0, cfs_list_empty(&cl_envs)));
+ if (cl_envs_cached_nr > 0) {
+ int rc;
+
+ cle = container_of(cl_envs.next, struct cl_env, ce_linkage);
+ cfs_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);
* 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
env = cl_env_peek(refcheck);
if (env == NULL) {
- 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;
}
/**
+ * 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 cl_env_cache_purge(unsigned nr)
+{
+ struct cl_env *cle;
+
+ ENTRY;
+ spin_lock(&cl_envs_guard);
+ for (; !cfs_list_empty(&cl_envs) && nr > 0; --nr) {
+ cle = container_of(cl_envs.next, struct cl_env, ce_linkage);
+ cfs_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, cfs_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
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);
+ cfs_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);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff