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target: Convert se_device statistics to atomic_long_t

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This patch converts the handful of se_device statistics to type
atomic_long_t, instead of using se_device->stats_lock when
incrementing these values.

More importantly, go ahead and drop the spinlock usage within
transport_lookup_cmd_lun() fast-path code.

Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger
2013-11-13 18:34:55 -08:00
parent 29f4c09007
commit ee480683d9
4 changed files with 17 additions and 21 deletions
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9
include/target/target_core_base.h
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@@ -683,11 +683,10 @@ struct se_device {
/* Pointer to transport specific device structure */
u32 dev_index;
u64 creation_time;
u32 num_resets;
u64 num_cmds;
u64 read_bytes;
u64 write_bytes;
spinlock_t stats_lock;
atomic_long_t num_resets;
atomic_long_t num_cmds;
atomic_long_t read_bytes;
atomic_long_t write_bytes;
/* Active commands on this virtual SE device */
atomic_t simple_cmds;
atomic_t dev_ordered_id;