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scst: Remove the existing latency measurement infrastructure

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Remove the existing latency measurement infrastructure since it will be
replaced by a new and more powerful latency measurement infrastructure.


git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@7481 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Bart Van Assche
2018-09-27 02:25:43 +00:00
parent 2231b598c6
commit f1357f410e
13 changed files with 3 additions and 1242 deletions
Download Patch File Download Diff File Expand all files Collapse all files
scst/include/scst.h
-80
View File
@@ -23,7 +23,6 @@
#define __SCST_H
/** See README for description of those conditional defines **/
/* #define CONFIG_SCST_MEASURE_LATENCY */
/* #define CONFIG_SCST_DEBUG_TM */
/* #define CONFIG_SCST_TM_DBG_GO_OFFLINE */
@@ -41,9 +40,6 @@
#include <linux/wait.h>
#include <linux/cpumask.h>
#include <linux/dlm.h>
#ifdef CONFIG_SCST_MEASURE_LATENCY
#include <linux/log2.h>
#endif
#include <asm/unaligned.h>
#if 0 /* Let's disable it for now to see if users will complain about it */
@@ -1848,51 +1844,6 @@ struct scst_tgt {
#endif
};
#ifdef CONFIG_SCST_MEASURE_LATENCY
/* Divide two 64-bit numbers with reasonably accuracy. */
static inline void __scst_time_per_cmd(uint64_t *t, uint64_t n)
{
unsigned int shift;
if (!n)
return;
shift = max(0, ilog2(n) - 32 + 1);
*t >>= shift;
n >>= shift;
WARN_ON(n != (uint32_t)n);
do_div(*t, (uint32_t)n);
}
#define scst_time_per_cmd(t, n) __scst_time_per_cmd(&(t), (n))
/* Defines extended latency statistics */
struct scst_ext_latency_stat {
uint64_t scst_time_rd, tgt_time_rd, dev_time_rd;
uint64_t processed_cmds_rd;
uint64_t min_scst_time_rd, min_tgt_time_rd, min_dev_time_rd;
uint64_t max_scst_time_rd, max_tgt_time_rd, max_dev_time_rd;
uint64_t scst_time_wr, tgt_time_wr, dev_time_wr;
uint64_t processed_cmds_wr;
uint64_t min_scst_time_wr, min_tgt_time_wr, min_dev_time_wr;
uint64_t max_scst_time_wr, max_tgt_time_wr, max_dev_time_wr;
};
#define SCST_IO_SIZE_THRESHOLD_SMALL (8*1024)
#define SCST_IO_SIZE_THRESHOLD_MEDIUM (32*1024)
#define SCST_IO_SIZE_THRESHOLD_LARGE (128*1024)
#define SCST_IO_SIZE_THRESHOLD_VERY_LARGE (512*1024)
#define SCST_LATENCY_STAT_INDEX_SMALL 0
#define SCST_LATENCY_STAT_INDEX_MEDIUM 1
#define SCST_LATENCY_STAT_INDEX_LARGE 2
#define SCST_LATENCY_STAT_INDEX_VERY_LARGE 3
#define SCST_LATENCY_STAT_INDEX_OTHER 4
#define SCST_LATENCY_STATS_NUM (SCST_LATENCY_STAT_INDEX_OTHER + 1)
#endif /* CONFIG_SCST_MEASURE_LATENCY */
struct scst_io_stat_entry {
uint64_t cmd_count;
uint64_t io_byte_count;
@@ -2030,15 +1981,6 @@ struct scst_session {
void (*init_result_fn)(struct scst_session *sess, void *data,
int result);
void (*unreg_done_fn)(struct scst_session *sess);
#ifdef CONFIG_SCST_MEASURE_LATENCY
spinlock_t lat_lock;
uint64_t scst_time, tgt_time, dev_time;
uint64_t processed_cmds;
uint64_t min_scst_time, min_tgt_time, min_dev_time;
uint64_t max_scst_time, max_tgt_time, max_dev_time;
struct scst_ext_latency_stat sess_latency_stat[SCST_LATENCY_STATS_NUM];
#endif
};
/*
@@ -2592,16 +2534,6 @@ struct scst_cmd {
char not_parsed_op_name[8];
#endif
#ifdef CONFIG_SCST_MEASURE_LATENCY
uint64_t start, curr_start, parse_time;
uint64_t tgt_alloc_buf_time, dev_alloc_buf_time;
uint64_t restart_waiting_time, rdy_to_xfer_time;
uint64_t pre_exec_time;
bool exec_time_counting;
uint64_t exec_time, dev_done_time;
uint64_t xmit_time;
#endif
#ifdef CONFIG_SCST_DEBUG_TM
/* Set if the cmd was delayed by task management debugging code */
unsigned int tm_dbg_delayed:1;
@@ -3267,15 +3199,6 @@ struct scst_tgt_dev {
struct kobject tgt_dev_kobj; /* sessions' LUNs sysfs entry */
#endif
#ifdef CONFIG_SCST_MEASURE_LATENCY
/*
* Protected by sess->lat_lock.
*/
uint64_t scst_time, tgt_time, dev_time;
uint64_t processed_cmds;
struct scst_ext_latency_stat dev_latency_stat[SCST_LATENCY_STATS_NUM];
#endif
};
/*
@@ -5270,9 +5193,6 @@ void scst_resume_activity(void);
void scst_process_active_cmd(struct scst_cmd *cmd, bool atomic);
void scst_post_parse(struct scst_cmd *cmd);
void scst_post_dev_alloc_data_buf(struct scst_cmd *cmd);
int __scst_check_local_events(struct scst_cmd *cmd, bool preempt_tests_only);
/**