xref: /openbmc/linux/Documentation/ABI/testing/sysfs-kernel-mm-damon (revision f968c6a4)

what:		/sys/kernel/mm/damon/
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Interface for Data Access MONitoring (DAMON).  Contains files
		for controlling DAMON.  For more details on DAMON itself,
		please refer to Documentation/admin-guide/mm/damon/index.rst.

What:		/sys/kernel/mm/damon/admin/
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Interface for privileged users of DAMON.  Contains files for
		controlling DAMON that aimed to be used by privileged users.

What:		/sys/kernel/mm/damon/admin/kdamonds/nr_kdamonds
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing a number 'N' to this file creates the number of
		directories for controlling each DAMON worker thread (kdamond)
		named '0' to 'N-1' under the kdamonds/ directory.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/state
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing 'on' or 'off' to this file makes the kdamond starts or
		stops, respectively.  Reading the file returns the keywords
		based on the current status.  Writing 'update_schemes_stats' to
		the file updates contents of schemes stats files of the
		kdamond.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/pid
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Reading this file returns the pid of the kdamond if it is
		running.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/nr_contexts
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing a number 'N' to this file creates the number of
		directories for controlling each DAMON context named '0' to
		'N-1' under the contexts/ directory.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/operations
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing a keyword for a monitoring operations set ('vaddr' for
		virtual address spaces monitoring, and 'paddr' for the physical
		address space monitoring) to this file makes the context to use
		the operations set.  Reading the file returns the keyword for
		the operations set the context is set to use.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/monitoring_attrs/intervals/sample_us
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing a value to this file sets the sampling interval of the
		DAMON context in microseconds as the value.  Reading this file
		returns the value.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/monitoring_attrs/intervals/aggr_us
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing a value to this file sets the aggregation interval of
		the DAMON context in microseconds as the value.  Reading this
		file returns the value.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/monitoring_attrs/intervals/update_us
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing a value to this file sets the update interval of the
		DAMON context in microseconds as the value.  Reading this file
		returns the value.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/monitoring_attrs/nr_regions/min

WDate:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing a value to this file sets the minimum number of
		monitoring regions of the DAMON context as the value.  Reading
		this file returns the value.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/monitoring_attrs/nr_regions/max
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing a value to this file sets the maximum number of
		monitoring regions of the DAMON context as the value.  Reading
		this file returns the value.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/targets/nr_targets
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing a number 'N' to this file creates the number of
		directories for controlling each DAMON target of the context
		named '0' to 'N-1' under the contexts/ directory.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/targets/<T>/pid_target
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing to and reading from this file sets and gets the pid of
		the target process if the context is for virtual address spaces
		monitoring, respectively.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/targets/<T>/regions/nr_regions
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing a number 'N' to this file creates the number of
		directories for setting each DAMON target memory region of the
		context named '0' to 'N-1' under the regions/ directory.  In
		case of the virtual address space monitoring, DAMON
		automatically sets the target memory region based on the target
		processes' mappings.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/targets/<T>/regions/<R>/start
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing to and reading from this file sets and gets the start
		address of the monitoring region.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/targets/<T>/regions/<R>/end
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing to and reading from this file sets and gets the end
		address of the monitoring region.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/nr_schemes
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing a number 'N' to this file creates the number of
		directories for controlling each DAMON-based operation scheme
		of the context named '0' to 'N-1' under the schemes/ directory.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/action
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing to and reading from this file sets and gets the action
		of the scheme.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/access_pattern/sz/min
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing to and reading from this file sets and gets the mimimum
		size of the scheme's target regions in bytes.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/access_pattern/sz/max
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing to and reading from this file sets and gets the maximum
		size of the scheme's target regions in bytes.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/access_pattern/nr_accesses/min
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing to and reading from this file sets and gets the manimum
		'nr_accesses' of the scheme's target regions.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/access_pattern/nr_accesses/max
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing to and reading from this file sets and gets the maximum
		'nr_accesses' of the scheme's target regions.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/access_pattern/age/min
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing to and reading from this file sets and gets the minimum
		'age' of the scheme's target regions.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/access_pattern/age/max
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing to and reading from this file sets and gets the maximum
		'age' of the scheme's target regions.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/quotas/ms
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing to and reading from this file sets and gets the time
		quota of the scheme in milliseconds.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/quotas/bytes
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing to and reading from this file sets and gets the size
		quota of the scheme in bytes.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/quotas/reset_interval_ms
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing to and reading from this file sets and gets the quotas
		charge reset interval of the scheme in milliseconds.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/quotas/weights/sz_permil
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing to and reading from this file sets and gets the
		under-quota limit regions prioritization weight for 'size' in
		permil.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/quotas/weights/nr_accesses_permil
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing to and reading from this file sets and gets the
		under-quota limit regions prioritization weight for
		'nr_accesses' in permil.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/quotas/weights/age_permil
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing to and reading from this file sets and gets the
		under-quota limit regions prioritization weight for 'age' in
		permil.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/watermarks/metric
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing to and reading from this file sets and gets the metric
		of the watermarks for the scheme.  The writable/readable
		keywords for this file are 'none' for disabling the watermarks
		feature, or 'free_mem_rate' for the system's global free memory
		rate in permil.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/watermarks/interval_us
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing to and reading from this file sets and gets the metric
		check interval of the watermarks for the scheme in
		microseconds.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/watermarks/high
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing to and reading from this file sets and gets the high
		watermark of the scheme in permil.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/watermarks/mid
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing to and reading from this file sets and gets the mid
		watermark of the scheme in permil.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/watermarks/low
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Writing to and reading from this file sets and gets the low
		watermark of the scheme in permil.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/stats/nr_tried
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Reading this file returns the number of regions that the action
		of the scheme has tried to be applied.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/stats/sz_tried
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Reading this file returns the total size of regions that the
		action of the scheme has tried to be applied in bytes.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/stats/nr_applied
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Reading this file returns the number of regions that the action
		of the scheme has successfully applied.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/stats/sz_applied
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Reading this file returns the total size of regions that the
		action of the scheme has successfully applied in bytes.

What:		/sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/stats/qt_exceeds
Date:		Mar 2022
Contact:	SeongJae Park <sj@kernel.org>
Description:	Reading this file returns the number of the exceed events of
		the scheme's quotas.