diff options
5 files changed, 92 insertions, 6 deletions
diff --git a/drivers/staging/lustre/lustre/include/cl_object.h b/drivers/staging/lustre/lustre/include/cl_object.h index fb971ded5a1b..e611f790285a 100644 --- a/drivers/staging/lustre/lustre/include/cl_object.h +++ b/drivers/staging/lustre/lustre/include/cl_object.h @@ -3241,6 +3241,7 @@ void *cl_env_reenter(void); void cl_env_reexit(void *cookie); void cl_env_implant(struct lu_env *env, int *refcheck); void cl_env_unplant(struct lu_env *env, int *refcheck); +unsigned int cl_env_cache_purge(unsigned int nr); /** @} cl_env */ diff --git a/drivers/staging/lustre/lustre/llite/lcommon_misc.c b/drivers/staging/lustre/lustre/llite/lcommon_misc.c index d80bcedd78d1..f68c3687b1d9 100644 --- a/drivers/staging/lustre/lustre/llite/lcommon_misc.c +++ b/drivers/staging/lustre/lustre/llite/lcommon_misc.c @@ -146,10 +146,11 @@ int cl_get_grouplock(struct cl_object *obj, unsigned long gid, int nonblock, rc = cl_io_init(env, io, CIT_MISC, io->ci_obj); if (rc) { + cl_io_fini(env, io); + cl_env_put(env, &refcheck); /* Does not make sense to take GL for released layout */ if (rc > 0) rc = -ENOTSUPP; - cl_env_put(env, &refcheck); return rc; } diff --git a/drivers/staging/lustre/lustre/llite/llite_lib.c b/drivers/staging/lustre/lustre/llite/llite_lib.c index 6d6bb33e3655..673d31e044dd 100644 --- a/drivers/staging/lustre/lustre/llite/llite_lib.c +++ b/drivers/staging/lustre/lustre/llite/llite_lib.c @@ -999,6 +999,8 @@ void ll_put_super(struct super_block *sb) lustre_common_put_super(sb); + cl_env_cache_purge(~0); + module_put(THIS_MODULE); } /* client_put_super */ diff --git a/drivers/staging/lustre/lustre/obdclass/cl_object.c b/drivers/staging/lustre/lustre/obdclass/cl_object.c index 43e299d4d416..0772706dbffc 100644 --- a/drivers/staging/lustre/lustre/obdclass/cl_object.c +++ b/drivers/staging/lustre/lustre/obdclass/cl_object.c @@ -492,6 +492,13 @@ 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; @@ -697,6 +704,39 @@ 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 +767,8 @@ 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 +782,7 @@ 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 +826,32 @@ 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 +873,22 @@ 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); diff --git a/drivers/staging/lustre/lustre/obdclass/lu_object.c b/drivers/staging/lustre/lustre/obdclass/lu_object.c index 69fdcee0ac52..770d5bd742d8 100644 --- a/drivers/staging/lustre/lustre/obdclass/lu_object.c +++ b/drivers/staging/lustre/lustre/obdclass/lu_object.c @@ -55,6 +55,7 @@ #include "../include/lustre_disk.h" #include "../include/lustre_fid.h" #include "../include/lu_object.h" +#include "../include/cl_object.h" #include "../include/lu_ref.h" #include <linux/list.h> @@ -1468,6 +1469,7 @@ void lu_context_key_quiesce(struct lu_context_key *key) /* * XXX layering violation. */ + cl_env_cache_purge(~0); key->lct_tags |= LCT_QUIESCENT; /* * XXX memory barrier has to go here. |