From: Li Xi <l...@ddn.com> Most of the time, keys are never changed. So rwlock might be better for the concurrency of key read.
Signed-off-by: Li Xi <l...@ddn.com> Signed-off-by: Gu Zheng <gzh...@ddn.com> Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-6800 Reviewed-on: http://review.whamcloud.com/15558 Reviewed-by: Faccini Bruno <bruno.facc...@intel.com> Reviewed-by: James Simmons <uja.o...@yahoo.com> Reviewed-by: Oleg Drokin <oleg.dro...@intel.com> Signed-off-by: James Simmons <jsimm...@infradead.org> --- drivers/staging/lustre/lustre/obdclass/lu_object.c | 38 +++++++++++----------- 1 file changed, 19 insertions(+), 19 deletions(-) diff --git a/drivers/staging/lustre/lustre/obdclass/lu_object.c b/drivers/staging/lustre/lustre/obdclass/lu_object.c index fa986f2..04475e9 100644 --- a/drivers/staging/lustre/lustre/obdclass/lu_object.c +++ b/drivers/staging/lustre/lustre/obdclass/lu_object.c @@ -1317,7 +1317,7 @@ enum { static struct lu_context_key *lu_keys[LU_CONTEXT_KEY_NR] = { NULL, }; -static DEFINE_SPINLOCK(lu_keys_guard); +static DEFINE_RWLOCK(lu_keys_guard); static atomic_t lu_key_initing_cnt = ATOMIC_INIT(0); /** @@ -1341,7 +1341,7 @@ int lu_context_key_register(struct lu_context_key *key) LASSERT(key->lct_tags != 0); result = -ENFILE; - spin_lock(&lu_keys_guard); + write_lock(&lu_keys_guard); for (i = 0; i < ARRAY_SIZE(lu_keys); ++i) { if (!lu_keys[i]) { key->lct_index = i; @@ -1353,7 +1353,7 @@ int lu_context_key_register(struct lu_context_key *key) break; } } - spin_unlock(&lu_keys_guard); + write_unlock(&lu_keys_guard); return result; } EXPORT_SYMBOL(lu_context_key_register); @@ -1387,7 +1387,7 @@ void lu_context_key_degister(struct lu_context_key *key) lu_context_key_quiesce(key); ++key_set_version; - spin_lock(&lu_keys_guard); + write_lock(&lu_keys_guard); key_fini(&lu_shrink_env.le_ctx, key->lct_index); /** @@ -1395,18 +1395,18 @@ void lu_context_key_degister(struct lu_context_key *key) * run lu_context_key::lct_fini() method. */ while (atomic_read(&key->lct_used) > 1) { - spin_unlock(&lu_keys_guard); + write_unlock(&lu_keys_guard); CDEBUG(D_INFO, "%s: \"%s\" %p, %d\n", __func__, module_name(key->lct_owner), key, atomic_read(&key->lct_used)); schedule(); - spin_lock(&lu_keys_guard); + write_lock(&lu_keys_guard); } if (lu_keys[key->lct_index]) { lu_keys[key->lct_index] = NULL; lu_ref_fini(&key->lct_reference); } - spin_unlock(&lu_keys_guard); + write_unlock(&lu_keys_guard); LASSERTF(atomic_read(&key->lct_used) == 1, "key has instances: %d\n", @@ -1526,7 +1526,7 @@ void lu_context_key_quiesce(struct lu_context_key *key) /* * XXX memory barrier has to go here. */ - spin_lock(&lu_keys_guard); + write_lock(&lu_keys_guard); key->lct_tags |= LCT_QUIESCENT; /** @@ -1534,19 +1534,19 @@ void lu_context_key_quiesce(struct lu_context_key *key) * have completed. */ while (atomic_read(&lu_key_initing_cnt) > 0) { - spin_unlock(&lu_keys_guard); + write_unlock(&lu_keys_guard); CDEBUG(D_INFO, "%s: \"%s\" %p, %d (%d)\n", __func__, module_name(key->lct_owner), key, atomic_read(&key->lct_used), atomic_read(&lu_key_initing_cnt)); schedule(); - spin_lock(&lu_keys_guard); + write_lock(&lu_keys_guard); } list_for_each_entry(ctx, &lu_context_remembered, lc_remember) key_fini(ctx, key->lct_index); - spin_unlock(&lu_keys_guard); + write_unlock(&lu_keys_guard); ++key_set_version; } } @@ -1584,9 +1584,9 @@ static int keys_fill(struct lu_context *ctx) * An atomic_t variable is still used, in order not to reacquire the * lock when decrementing the counter. */ - spin_lock(&lu_keys_guard); + read_lock(&lu_keys_guard); atomic_inc(&lu_key_initing_cnt); - spin_unlock(&lu_keys_guard); + read_unlock(&lu_keys_guard); LINVRNT(ctx->lc_value); for (i = 0; i < ARRAY_SIZE(lu_keys); ++i) { @@ -1655,9 +1655,9 @@ int lu_context_init(struct lu_context *ctx, __u32 tags) ctx->lc_state = LCS_INITIALIZED; ctx->lc_tags = tags; if (tags & LCT_REMEMBER) { - spin_lock(&lu_keys_guard); + write_lock(&lu_keys_guard); list_add(&ctx->lc_remember, &lu_context_remembered); - spin_unlock(&lu_keys_guard); + write_unlock(&lu_keys_guard); } else { INIT_LIST_HEAD(&ctx->lc_remember); } @@ -1683,10 +1683,10 @@ void lu_context_fini(struct lu_context *ctx) keys_fini(ctx); } else { /* could race with key degister */ - spin_lock(&lu_keys_guard); + write_lock(&lu_keys_guard); keys_fini(ctx); list_del_init(&ctx->lc_remember); - spin_unlock(&lu_keys_guard); + write_unlock(&lu_keys_guard); } } EXPORT_SYMBOL(lu_context_fini); @@ -1714,7 +1714,7 @@ void lu_context_exit(struct lu_context *ctx) for (i = 0; i < ARRAY_SIZE(lu_keys); ++i) { /* could race with key quiescency */ if (ctx->lc_tags & LCT_REMEMBER) - spin_lock(&lu_keys_guard); + read_lock(&lu_keys_guard); if (ctx->lc_value[i]) { struct lu_context_key *key; @@ -1724,7 +1724,7 @@ void lu_context_exit(struct lu_context *ctx) key, ctx->lc_value[i]); } if (ctx->lc_tags & LCT_REMEMBER) - spin_unlock(&lu_keys_guard); + read_unlock(&lu_keys_guard); } } } -- 1.8.3.1 _______________________________________________ devel mailing list de...@linuxdriverproject.org http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
