* 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;
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_obtain(__builtin_return_address(0));
+ env = cl_env_new(lu_context_tags_default,
+ lu_session_tags_default,
+ __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);
- /*
- * 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);
+ cl_env_fini(cle);
}
}
EXPORT_SYMBOL(cl_env_put);
git://git.whamcloud.com / fs / lustre-release.git / commitdiff