diff options
| author | Mingzhe Zou <mingzhe.zou@easystack.cn> | 2022-03-01 15:55:00 +0800 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2022-03-14 23:40:36 -0400 |
| commit | d72d827f2f2636d8d72f0f3ebe5b661c9a24d343 (patch) | |
| tree | b0ecafd9845045fa030fd2fc2fbf2133d1f9e4d6 /drivers/target/iscsi/iscsi_target_configfs.c | |
| parent | 095478a6e5bf590f2bbf341569eb25173c9c5f32 (diff) | |
scsi: target: Add iscsi/cpus_allowed_list in configfs
The RX/TX threads for iSCSI connection can be scheduled to any online CPUs,
and will not be rescheduled.
When binding other heavy load threads along with iSCSI connection RX/TX
thread to the same CPU, the iSCSI performance will be worse.
Add iscsi/cpus_allowed_list in configfs. The available CPU set of iSCSI
connection RX/TX threads is allowed_cpus & online_cpus. If it is modified,
all RX/TX threads will be rescheduled.
Link: https://lore.kernel.org/r/20220301075500.14266-1-mingzhe.zou@easystack.cn
Reviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Mingzhe Zou <mingzhe.zou@easystack.cn>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/target/iscsi/iscsi_target_configfs.c')
| -rw-r--r-- | drivers/target/iscsi/iscsi_target_configfs.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/target/iscsi/iscsi_target_configfs.c b/drivers/target/iscsi/iscsi_target_configfs.c index 2a9de24a8bbe..0cedcfe207b5 100644 --- a/drivers/target/iscsi/iscsi_target_configfs.c +++ b/drivers/target/iscsi/iscsi_target_configfs.c @@ -1127,8 +1127,40 @@ static ssize_t lio_target_wwn_lio_version_show(struct config_item *item, CONFIGFS_ATTR_RO(lio_target_wwn_, lio_version); +static ssize_t lio_target_wwn_cpus_allowed_list_show( + struct config_item *item, char *page) +{ + return sprintf(page, "%*pbl\n", + cpumask_pr_args(iscsit_global->allowed_cpumask)); +} + +static ssize_t lio_target_wwn_cpus_allowed_list_store( + struct config_item *item, const char *page, size_t count) +{ + int ret; + char *orig; + cpumask_t new_allowed_cpumask; + + orig = kstrdup(page, GFP_KERNEL); + if (!orig) + return -ENOMEM; + + cpumask_clear(&new_allowed_cpumask); + ret = cpulist_parse(orig, &new_allowed_cpumask); + + kfree(orig); + if (ret != 0) + return ret; + + cpumask_copy(iscsit_global->allowed_cpumask, &new_allowed_cpumask); + return count; +} + +CONFIGFS_ATTR(lio_target_wwn_, cpus_allowed_list); + static struct configfs_attribute *lio_target_wwn_attrs[] = { &lio_target_wwn_attr_lio_version, + &lio_target_wwn_attr_cpus_allowed_list, NULL, }; |