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Ordered reads groupped under single config symbol.

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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@1350 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Vladislav Bolkhovitin
2009-11-19 11:57:57 +00:00
parent 4e65d67680
commit 8219791b72
1 changed files with 10 additions and 2 deletions
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12
scst/src/scst_targ.c
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@@ -33,6 +33,11 @@
#include "scst.h"
#include "scst_priv.h"
#if 0 /* Temporary, left for future performance investigations */
/* Deleting it don't forget to delete write_cmd_count */
#define CONFIG_SCST_ORDERED_READS
#endif
static void scst_cmd_set_sn(struct scst_cmd *cmd);
static int __scst_init_cmd(struct scst_cmd *cmd);
static void scst_finish_cmd_mgmt(struct scst_cmd *cmd);
@@ -2855,10 +2860,11 @@ static int scst_pre_xmit_response(struct scst_cmd *cmd)
if (likely(cmd->tgt_dev != NULL)) {
atomic_dec(&cmd->tgt_dev->tgt_dev_cmd_count);
atomic_dec(&cmd->dev->dev_cmd_count);
#ifdef CONFIG_SCST_ORDERED_READS
/* If expected values not set, expected direction is UNKNOWN */
if (cmd->expected_data_direction & SCST_DATA_WRITE)
atomic_dec(&cmd->dev->write_cmd_count);
#endif
if (unlikely(cmd->queue_type == SCST_CMD_QUEUE_HEAD_OF_QUEUE))
scst_on_hq_cmd_response(cmd);
@@ -3136,7 +3142,7 @@ static void scst_cmd_set_sn(struct scst_cmd *cmd)
switch (cmd->queue_type) {
case SCST_CMD_QUEUE_SIMPLE:
case SCST_CMD_QUEUE_UNTAGGED:
#if 0 /* left for future performance investigations */
#ifdef CONFIG_SCST_ORDERED_READS
if (scst_cmd_is_expected_set(cmd)) {
if ((cmd->expected_data_direction == SCST_DATA_READ) &&
(atomic_read(&cmd->dev->write_cmd_count) == 0))
@@ -3332,9 +3338,11 @@ static int __scst_init_cmd(struct scst_cmd *cmd)
}
}
#ifdef CONFIG_SCST_ORDERED_READS
/* If expected values not set, expected direction is UNKNOWN */
if (cmd->expected_data_direction & SCST_DATA_WRITE)
atomic_inc(&cmd->dev->write_cmd_count);
#endif
if (unlikely(failure))
goto out_busy;