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Date: Fri, 09 Jan 2009 12:53:27 -0800
From: "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To: "Linux-iSCSI.org Target Dev"
<linux-iscsi-target-dev@...glegroups.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
linux-scsi <linux-scsi@...r.kernel.org>
Subject: [PATCH 1/5] [LIO-Target]: Convert iscsi_queue_req_t to use struct
kmem_cache
>>From 9c8fd0d95735fad86d7e488d4086eabdc7575c2c Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@...ux-iscsi.org>
Date: Fri, 9 Jan 2009 10:31:03 -0800
Subject: [PATCH 1/5] [LIO-Target]: Convert iscsi_queue_req_t to use struct kmem_cache
This patch converts usage of the structure iscsi_queue_req_t to use
struct kmem_cache *lio_qr_cache.
Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>
---
drivers/lio-core/iscsi_target.c | 15 +++++++++++++--
drivers/lio-core/iscsi_target_util.c | 15 +++++++--------
2 files changed, 20 insertions(+), 10 deletions(-)
diff --git a/drivers/lio-core/iscsi_target.c b/drivers/lio-core/iscsi_target.c
index d95a506..5c73c82 100644
--- a/drivers/lio-core/iscsi_target.c
+++ b/drivers/lio-core/iscsi_target.c
@@ -96,6 +96,7 @@ iscsi_global_t *iscsi_global = NULL;
struct kmem_cache *lio_cmd_cache = NULL;
struct kmem_cache *lio_sess_cache = NULL;
+struct kmem_cache *lio_qr_cache = NULL;
extern int se_allocate_rl_cmd (se_cmd_t *, unsigned char *, u64);
extern int iscsi_build_report_luns_response (iscsi_cmd_t *);
@@ -1117,6 +1118,13 @@ static int iscsi_target_detect(void)
goto out;
}
+ if (!(lio_qr_cache = kmem_cache_create("lio_qr_cache",
+ sizeof(iscsi_queue_req_t), __alignof__(iscsi_queue_req_t),
+ 0, NULL))) {
+ printk(KERN_ERR "nable to kmem_cache_create() for lio_qr_cache\n");
+ goto out;
+ }
+
if (core_load_discovery_tpg() < 0)
goto out;
@@ -1130,6 +1138,8 @@ out:
kmem_cache_destroy(lio_cmd_cache);
if (lio_sess_cache)
kmem_cache_destroy(lio_sess_cache);
+ if (lio_qr_cache)
+ kmem_cache_destroy(lio_qr_cache);
iscsi_deallocate_thread_sets(TARGET);
iscsi_target_deregister_configfs();
#ifdef CONFIG_PROC_FS
@@ -1182,6 +1192,7 @@ extern void iscsi_target_release_phase2 (void)
iscsi_hba_del_all_hbas();
kmem_cache_destroy(lio_cmd_cache);
kmem_cache_destroy(lio_sess_cache);
+ kmem_cache_destroy(lio_qr_cache);
core_release_discovery_tpg();
core_release_tiqns();
plugin_deregister_class(PLUGIN_TYPE_FRONTEND);
@@ -4262,7 +4273,7 @@ get_immediate:
atomic_set(&conn->check_immediate_queue, 0);
cmd = qr->cmd;
state = qr->state;
- kfree(qr);
+ kmem_cache_free(lio_qr_cache, qr);
spin_lock_bh(&cmd->istate_lock);
switch (state) {
@@ -4346,7 +4357,7 @@ get_response:
if ((qr = iscsi_get_cmd_from_response_queue(conn))) {
cmd = qr->cmd;
state = qr->state;
- kfree(qr);
+ kmem_cache_free(lio_qr_cache, qr);
spin_lock_bh(&cmd->istate_lock);
check_rsp_state:
diff --git a/drivers/lio-core/iscsi_target_util.c b/drivers/lio-core/iscsi_target_util.c
index cb679b8..d170cdb 100644
--- a/drivers/lio-core/iscsi_target_util.c
+++ b/drivers/lio-core/iscsi_target_util.c
@@ -73,6 +73,7 @@
extern struct target_fabric_configfs *lio_target_fabric_configfs;
extern iscsi_global_t *iscsi_global;
extern struct kmem_cache *lio_cmd_cache;
+extern struct kmem_cache *lio_qr_cache;
extern int iscsi_add_nopin (iscsi_conn_t *, int);
@@ -823,11 +824,10 @@ extern void iscsi_add_cmd_to_immediate_queue (iscsi_cmd_t *cmd, iscsi_conn_t *co
{
iscsi_queue_req_t *qr;
- if (!(qr = kmalloc(sizeof(iscsi_queue_req_t), GFP_ATOMIC))) {
+ if (!(qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC))) {
TRACE_ERROR("Unable to allocate memory for iscsi_queue_req_t\n");
return;
}
- memset(qr, 0, sizeof(iscsi_queue_req_t));
#if 0
printk("Adding ITT: 0x%08x state: %d to immediate queue\n", cmd->init_task_tag, state);
#endif
@@ -896,7 +896,7 @@ static void iscsi_remove_cmd_from_immediate_queue (iscsi_cmd_t *cmd, iscsi_conn_
atomic_dec(&qr->cmd->immed_queue_count);
REMOVE_ENTRY_FROM_LIST(qr, conn->immed_queue_head, conn->immed_queue_tail);
- kfree(qr);
+ kmem_cache_free(lio_qr_cache, qr);
qr = qr_next;
}
@@ -918,11 +918,10 @@ extern void iscsi_add_cmd_to_response_queue (iscsi_cmd_t *cmd, iscsi_conn_t *con
{
iscsi_queue_req_t *qr;
- if (!(qr = kmalloc(sizeof(iscsi_queue_req_t), GFP_ATOMIC))) {
+ if (!(qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC))) {
TRACE_ERROR("Unable to allocate memory for iscsi_queue_req_t\n");
return;
}
- memset(qr, 0, sizeof(iscsi_queue_req_t));
#if 0
printk("Adding ITT: 0x%08x state: %d to response queue\n", cmd->init_task_tag, state);
#endif
@@ -995,7 +994,7 @@ static void iscsi_remove_cmd_from_response_queue (iscsi_cmd_t *cmd, iscsi_conn_t
atomic_dec(&qr->cmd->response_queue_count);
REMOVE_ENTRY_FROM_LIST(qr, conn->response_queue_head, conn->response_queue_tail);
- kfree(qr);
+ kmem_cache_free(lio_qr_cache, qr);
qr = qr_next;
}
@@ -1033,7 +1032,7 @@ extern void iscsi_free_queue_reqs_for_conn (iscsi_conn_t *conn)
if (qr->cmd)
atomic_dec(&qr->cmd->immed_queue_count);
- kfree(qr);
+ kmem_cache_free(lio_qr_cache, qr);
qr = qr_next;
}
conn->immed_queue_head = conn->immed_queue_tail = NULL;
@@ -1047,7 +1046,7 @@ extern void iscsi_free_queue_reqs_for_conn (iscsi_conn_t *conn)
if (qr->cmd)
atomic_dec(&qr->cmd->response_queue_count);
- kfree(qr);
+ kmem_cache_free(lio_qr_cache, qr);
qr = qr_next;
}
conn->response_queue_head = conn->response_queue_tail = NULL;
--
1.5.4.1
--
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