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Prepare first set of updates for 3.11 merge window.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,156 @@ | ||
| What: /sys/block/<disk>/bcache/unregister | ||
| Date: November 2010 | ||
| Contact: Kent Overstreet <kent.overstreet@gmail.com> | ||
| Description: | ||
| A write to this file causes the backing device or cache to be | ||
| unregistered. If a backing device had dirty data in the cache, | ||
| writeback mode is automatically disabled and all dirty data is | ||
| flushed before the device is unregistered. Caches unregister | ||
| all associated backing devices before unregistering themselves. | ||
|
|
||
| What: /sys/block/<disk>/bcache/clear_stats | ||
| Date: November 2010 | ||
| Contact: Kent Overstreet <kent.overstreet@gmail.com> | ||
| Description: | ||
| Writing to this file resets all the statistics for the device. | ||
|
|
||
| What: /sys/block/<disk>/bcache/cache | ||
| Date: November 2010 | ||
| Contact: Kent Overstreet <kent.overstreet@gmail.com> | ||
| Description: | ||
| For a backing device that has cache, a symlink to | ||
| the bcache/ dir of that cache. | ||
|
|
||
| What: /sys/block/<disk>/bcache/cache_hits | ||
| Date: November 2010 | ||
| Contact: Kent Overstreet <kent.overstreet@gmail.com> | ||
| Description: | ||
| For backing devices: integer number of full cache hits, | ||
| counted per bio. A partial cache hit counts as a miss. | ||
|
|
||
| What: /sys/block/<disk>/bcache/cache_misses | ||
| Date: November 2010 | ||
| Contact: Kent Overstreet <kent.overstreet@gmail.com> | ||
| Description: | ||
| For backing devices: integer number of cache misses. | ||
|
|
||
| What: /sys/block/<disk>/bcache/cache_hit_ratio | ||
| Date: November 2010 | ||
| Contact: Kent Overstreet <kent.overstreet@gmail.com> | ||
| Description: | ||
| For backing devices: cache hits as a percentage. | ||
|
|
||
| What: /sys/block/<disk>/bcache/sequential_cutoff | ||
| Date: November 2010 | ||
| Contact: Kent Overstreet <kent.overstreet@gmail.com> | ||
| Description: | ||
| For backing devices: Threshold past which sequential IO will | ||
| skip the cache. Read and written as bytes in human readable | ||
| units (i.e. echo 10M > sequntial_cutoff). | ||
|
|
||
| What: /sys/block/<disk>/bcache/bypassed | ||
| Date: November 2010 | ||
| Contact: Kent Overstreet <kent.overstreet@gmail.com> | ||
| Description: | ||
| Sum of all reads and writes that have bypassed the cache (due | ||
| to the sequential cutoff). Expressed as bytes in human | ||
| readable units. | ||
|
|
||
| What: /sys/block/<disk>/bcache/writeback | ||
| Date: November 2010 | ||
| Contact: Kent Overstreet <kent.overstreet@gmail.com> | ||
| Description: | ||
| For backing devices: When on, writeback caching is enabled and | ||
| writes will be buffered in the cache. When off, caching is in | ||
| writethrough mode; reads and writes will be added to the | ||
| cache but no write buffering will take place. | ||
|
|
||
| What: /sys/block/<disk>/bcache/writeback_running | ||
| Date: November 2010 | ||
| Contact: Kent Overstreet <kent.overstreet@gmail.com> | ||
| Description: | ||
| For backing devices: when off, dirty data will not be written | ||
| from the cache to the backing device. The cache will still be | ||
| used to buffer writes until it is mostly full, at which point | ||
| writes transparently revert to writethrough mode. Intended only | ||
| for benchmarking/testing. | ||
|
|
||
| What: /sys/block/<disk>/bcache/writeback_delay | ||
| Date: November 2010 | ||
| Contact: Kent Overstreet <kent.overstreet@gmail.com> | ||
| Description: | ||
| For backing devices: In writeback mode, when dirty data is | ||
| written to the cache and the cache held no dirty data for that | ||
| backing device, writeback from cache to backing device starts | ||
| after this delay, expressed as an integer number of seconds. | ||
|
|
||
| What: /sys/block/<disk>/bcache/writeback_percent | ||
| Date: November 2010 | ||
| Contact: Kent Overstreet <kent.overstreet@gmail.com> | ||
| Description: | ||
| For backing devices: If nonzero, writeback from cache to | ||
| backing device only takes place when more than this percentage | ||
| of the cache is used, allowing more write coalescing to take | ||
| place and reducing total number of writes sent to the backing | ||
| device. Integer between 0 and 40. | ||
|
|
||
| What: /sys/block/<disk>/bcache/synchronous | ||
| Date: November 2010 | ||
| Contact: Kent Overstreet <kent.overstreet@gmail.com> | ||
| Description: | ||
| For a cache, a boolean that allows synchronous mode to be | ||
| switched on and off. In synchronous mode all writes are ordered | ||
| such that the cache can reliably recover from unclean shutdown; | ||
| if disabled bcache will not generally wait for writes to | ||
| complete but if the cache is not shut down cleanly all data | ||
| will be discarded from the cache. Should not be turned off with | ||
| writeback caching enabled. | ||
|
|
||
| What: /sys/block/<disk>/bcache/discard | ||
| Date: November 2010 | ||
| Contact: Kent Overstreet <kent.overstreet@gmail.com> | ||
| Description: | ||
| For a cache, a boolean allowing discard/TRIM to be turned off | ||
| or back on if the device supports it. | ||
|
|
||
| What: /sys/block/<disk>/bcache/bucket_size | ||
| Date: November 2010 | ||
| Contact: Kent Overstreet <kent.overstreet@gmail.com> | ||
| Description: | ||
| For a cache, bucket size in human readable units, as set at | ||
| cache creation time; should match the erase block size of the | ||
| SSD for optimal performance. | ||
|
|
||
| What: /sys/block/<disk>/bcache/nbuckets | ||
| Date: November 2010 | ||
| Contact: Kent Overstreet <kent.overstreet@gmail.com> | ||
| Description: | ||
| For a cache, the number of usable buckets. | ||
|
|
||
| What: /sys/block/<disk>/bcache/tree_depth | ||
| Date: November 2010 | ||
| Contact: Kent Overstreet <kent.overstreet@gmail.com> | ||
| Description: | ||
| For a cache, height of the btree excluding leaf nodes (i.e. a | ||
| one node tree will have a depth of 0). | ||
|
|
||
| What: /sys/block/<disk>/bcache/btree_cache_size | ||
| Date: November 2010 | ||
| Contact: Kent Overstreet <kent.overstreet@gmail.com> | ||
| Description: | ||
| Number of btree buckets/nodes that are currently cached in | ||
| memory; cache dynamically grows and shrinks in response to | ||
| memory pressure from the rest of the system. | ||
|
|
||
| What: /sys/block/<disk>/bcache/written | ||
| Date: November 2010 | ||
| Contact: Kent Overstreet <kent.overstreet@gmail.com> | ||
| Description: | ||
| For a cache, total amount of data in human readable units | ||
| written to the cache, excluding all metadata. | ||
|
|
||
| What: /sys/block/<disk>/bcache/btree_written | ||
| Date: November 2010 | ||
| Contact: Kent Overstreet <kent.overstreet@gmail.com> | ||
| Description: | ||
| For a cache, sum of all btree writes in human readable units. |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,7 @@ | ||
| What: /sys/bus/mei/devices/.../modalias | ||
| Date: March 2013 | ||
| KernelVersion: 3.10 | ||
| Contact: Samuel Ortiz <sameo@linux.intel.com> | ||
| linux-mei@linux.intel.com | ||
| Description: Stores the same MODALIAS value emitted by uevent | ||
| Format: mei:<mei device name> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| What: /sys/devices/.../lpss_ltr/ | ||
| Date: March 2013 | ||
| Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com> | ||
| Description: | ||
| The /sys/devices/.../lpss_ltr/ directory is only present for | ||
| devices included into the Intel Lynxpoint Low Power Subsystem | ||
| (LPSS). If present, it contains attributes containing the LTR | ||
| mode and the values of LTR registers of the device. | ||
|
|
||
| What: /sys/devices/.../lpss_ltr/ltr_mode | ||
| Date: March 2013 | ||
| Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com> | ||
| Description: | ||
| The /sys/devices/.../lpss_ltr/ltr_mode attribute contains an | ||
| integer number (0 or 1) indicating whether or not the devices' | ||
| LTR functionality is working in the software mode (1). | ||
|
|
||
| This attribute is read-only. If the device's runtime PM status | ||
| is not "active", attempts to read from this attribute cause | ||
| -EAGAIN to be returned. | ||
|
|
||
| What: /sys/devices/.../lpss_ltr/auto_ltr | ||
| Date: March 2013 | ||
| Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com> | ||
| Description: | ||
| The /sys/devices/.../lpss_ltr/auto_ltr attribute contains the | ||
| current value of the device's AUTO_LTR register (raw) | ||
| represented as an 8-digit hexadecimal number. | ||
|
|
||
| This attribute is read-only. If the device's runtime PM status | ||
| is not "active", attempts to read from this attribute cause | ||
| -EAGAIN to be returned. | ||
|
|
||
| What: /sys/devices/.../lpss_ltr/sw_ltr | ||
| Date: March 2013 | ||
| Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com> | ||
| Description: | ||
| The /sys/devices/.../lpss_ltr/auto_ltr attribute contains the | ||
| current value of the device's SW_LTR register (raw) represented | ||
| as an 8-digit hexadecimal number. | ||
|
|
||
| This attribute is read-only. If the device's runtime PM status | ||
| is not "active", attempts to read from this attribute cause | ||
| -EAGAIN to be returned. |
13 changes: 13 additions & 0 deletions
13
Documentation/ABI/testing/sysfs-devices-power_resources_wakeup
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| What: /sys/devices/.../power_resources_wakeup/ | ||
| Date: April 2013 | ||
| Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com> | ||
| Description: | ||
| The /sys/devices/.../power_resources_wakeup/ directory is only | ||
| present for device objects representing ACPI device nodes that | ||
| require ACPI power resources for wakeup signaling. | ||
|
|
||
| If present, it contains symbolic links to device directories | ||
| representing ACPI power resources that need to be turned on for | ||
| the given device node to be able to signal wakeup. The names of | ||
| the links are the same as the names of the directories they | ||
| point to. |
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