| What: /sys/devices/platform/soc/<....>ufshc/manual_gc |
| Date: April, 2018 |
| Contact: "Jaegeuk Kim" <jaegeuk@google.com> |
| Description: |
| Control UFS to give a time for internal Garbage Collections, |
| given manual_gc_hold seconds. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/manual_gc_hold |
| Date: April, 2018 |
| Contact: "Jaegeuk Kim" <jaegeuk@google.com> |
| Description: |
| Give the seconds to UFS for internal GCs. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/slowio_read_us |
| Date: May, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Contains watermark value in micro seconds unit for slow |
| UFS read I/O logging and counting. Can be updated by writing |
| value to. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/slowio_read_cnt |
| Date: May, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Contains the number of UFS read I/O requests which took more |
| or equal to the defined slow I/O water mark time. |
| Can be reset by writing any value. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/slowio_write_us |
| Date: May, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Contains watermark value in micro seconds unit for slow |
| UFS write I/O logging and counting. Can be updated by writing |
| value to. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/slowio_write_cnt |
| Date: May, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Contains the number of UFS write I/O requests which took more |
| or equal to the defined slow I/O water mark time. |
| Can be reset by writing any value. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/slowio_unmap_us |
| Date: May, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Contains watermark value in micro seconds unit for slow |
| UFS unmap I/O logging and counting. Can be updated by writing |
| value to. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/slowio_unmap_cnt |
| Date: May, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Contains the number of UFS unmap I/O requests which took more |
| or equal to the defined slow I/O water mark time. |
| Can be reset by writing any value. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/slowio_sync_us |
| Date: May, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Contains watermark value in micro seconds unit for slow |
| UFS sync I/O logging and counting. Can be updated by writing |
| value to. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/slowio_sync_cnt |
| Date: May, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Contains the number of UFS sync I/O requests which took more |
| or equal to the defined slow I/O water mark time. |
| Can be reset by writing any value. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/impaired/enabled |
| Date: December, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Enable or disable impaired storage emulation. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/impaired/read_model |
| Date: December, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Degraded UFS performance model is applied for read requests. |
| It could be set with 'fragftl' or 'none'; the former enables |
| model based delay emulation and the later disables the feature. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/impaired/read_delay_percent |
| Date: December, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| This knob can be used to control target delay for UFS read requests. |
| It receives a precentage value, and the default value is 100, which means |
| no change. When 200 is written, the target latency with delay will be |
| twice of an input latency, which is either the actual latency or a latency |
| chosen by the degraded performance model when fragmented ftl emulation |
| feature is enabled. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/impaired/read_delay_us |
| Date: December, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| This knob is used to control target delay for UFS read requsts. |
| For each read request, this value will be added to the target delay. |
| For instance, when 200 is set, all read requests will be delayed |
| by 200 microseconds. The default value is 0, which means no delay. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/impaired/write_model |
| Date: December, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Degraded UFS performance model is applied for write requests. |
| It could be set with 'fragftl' or 'none'; the former enables |
| model based delay emulation and the later disables the feature. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/impaired/write_delay_percent |
| Date: December, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| This knob can be used to control target delay for UFS write requests. |
| It receives a precentage value, and the default value is 100, which means |
| no change. When 200 is written, the target latency with delay will be |
| twice of an input latency, which is either the actual latency or a latency |
| chosen by the degraded performance model when fragmented ftl emulation |
| feature is enabled. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/impaired/write_delay_us |
| Date: December, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| This knob is used to control target delay for UFS write requsts. |
| For each write request, this value will be added to the target delay. |
| For instance, when 200 is set, all write requests will be delayed |
| by 200 microseconds. The default value is 0, which means no delay. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/impaired/read_max_delayed_us |
| Date: December, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Maximum read request latency can be set by this entry. For instance, |
| when 1000 is set to this entry, the emulated read latency will not |
| be bigger than 1ms. |
| Default value is 0, which means no limitation. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/impaired/read_skip_delay_cnt |
| Date: December, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| This knob can be used to control delay emulation frequency. |
| When the default 0 is set, all read requests are delayed. |
| When 1 is written, every other read request is delayed. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/impaired/write_max_delayed_us |
| Date: December, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Maximum write request latency can be set by this entry. For instance, |
| when 1000 is set to this entry, the emulated write latency will not |
| be bigger than 1ms. |
| Default value is 0, which means no limitation. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/impaired/write_skip_delay_cnt |
| Date: December, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| This knob can be used to control delay emulation frequency. |
| When the default 0 is set, all write requests are delayed. |
| When 1 is written, every other write request is delayed. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/impaired/read_total_cnt |
| Date: December, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Total number of read requests can be checked by reading this entry. |
| Can be reset together with all other statistics entries when |
| any value is written to. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/impaired/read_total_original_us |
| Date: December, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Aggregated original read latencies without added delay can be checked |
| by reading this entry. |
| Can be reset together with all other statistics entries when |
| any value is written to. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/impaired/read_total_delayed_us |
| Date: December, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Aggregated read latencies with delay emulation can be checked |
| by reading this entry. |
| Can be reset together with all other statistics entries when |
| any value is written to. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/impaired/write_total_cnt |
| Date: December, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Total number of write requests can be checked by reading this entry. |
| Can be reset together with all other statistics entries when |
| any value is written to. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/impaired/write_total_original_us |
| Date: December, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Aggregated original write latencies without added delay can be checked |
| by reading this entry. |
| Can be reset together with all other statistics entries when |
| any value is written to. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/impaired/write_total_delayed_us |
| Date: December, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Aggregated write latencies with delay emulation can be checked |
| by reading this entry. |
| Can be reset together with all other statistics entries when |
| any value is written to. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/impaired/read_max_delay_us |
| Date: December, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Maximum read delay in microseconds, targeted by delay emulation, |
| can be checked by reading this entry. |
| Can be reset together with all other statistics entries when |
| any value is written to. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/impaired/read_max_delay_error_us |
| Date: December, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Added delay might be different from the intended delay value. |
| By reading this entry, observed maximum read delay error value can be |
| checked in microsecond unit. |
| Can be reset together with all other statistics entries when |
| any value is written to. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/impaired/read_total_delay_error_us |
| Date: December, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Added delay might be different from the intended delay value. |
| For all delayed read requests, the additional delay value than intended delay |
| is aggrated to this entry. |
| Can be reset together with all other statistics entries when |
| any value is written to. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/impaired/write_max_delay_us |
| Date: December, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Maximum write delay in microseconds, targeted by delay emulation, |
| can be checked by reading this entry. |
| Can be reset together with all other statistics entries when |
| any value is written to. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/impaired/write_max_delay_error_us |
| Date: December, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Added delay might be different from the intended delay value. |
| By reading this entry, observed maximum write delay error value can be |
| checked in microsecond unit. |
| Can be reset together with all other statistics entries when |
| any value is written to. |
| |
| What: /sys/devices/platform/soc/<....>ufshc/impaired/write_total_delay_error_us |
| Date: December, 2018 |
| Contact: "Hyojun Kim" <hyojun@google.com> |
| Description: |
| Added delay might be different from the intended delay value. |
| For all delayed write requests, the additional delay value than intended delay |
| is aggrated to this entry. |
| Can be reset together with all other statistics entries when |
| any value is written to. |
