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damon_rand() is called in three files:damon/core.c, damon/ paddr.c, damon/vaddr.c, i think there is no need to redefine this twice, So move it to damon.h will be a good choice. Link: https://lkml.kernel.org/r/20211202075859.51341-1-xhao@linux.alibaba.com Signed-off-by: Xin Hao <xhao@linux.alibaba.com> Reviewed-by: SeongJae Park <sj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
477 lines
18 KiB
C
477 lines
18 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* DAMON api
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*
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* Author: SeongJae Park <sjpark@amazon.de>
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*/
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#ifndef _DAMON_H_
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#define _DAMON_H_
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#include <linux/mutex.h>
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#include <linux/time64.h>
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#include <linux/types.h>
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#include <linux/random.h>
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/* Minimal region size. Every damon_region is aligned by this. */
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#define DAMON_MIN_REGION PAGE_SIZE
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/* Max priority score for DAMON-based operation schemes */
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#define DAMOS_MAX_SCORE (99)
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/* Get a random number in [l, r) */
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#define damon_rand(l, r) (l + prandom_u32_max(r - l))
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/**
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* struct damon_addr_range - Represents an address region of [@start, @end).
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* @start: Start address of the region (inclusive).
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* @end: End address of the region (exclusive).
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*/
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struct damon_addr_range {
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unsigned long start;
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unsigned long end;
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};
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/**
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* struct damon_region - Represents a monitoring target region.
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* @ar: The address range of the region.
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* @sampling_addr: Address of the sample for the next access check.
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* @nr_accesses: Access frequency of this region.
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* @list: List head for siblings.
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* @age: Age of this region.
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*
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* @age is initially zero, increased for each aggregation interval, and reset
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* to zero again if the access frequency is significantly changed. If two
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* regions are merged into a new region, both @nr_accesses and @age of the new
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* region are set as region size-weighted average of those of the two regions.
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*/
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struct damon_region {
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struct damon_addr_range ar;
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unsigned long sampling_addr;
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unsigned int nr_accesses;
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struct list_head list;
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unsigned int age;
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/* private: Internal value for age calculation. */
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unsigned int last_nr_accesses;
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};
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/**
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* struct damon_target - Represents a monitoring target.
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* @id: Unique identifier for this target.
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* @nr_regions: Number of monitoring target regions of this target.
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* @regions_list: Head of the monitoring target regions of this target.
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* @list: List head for siblings.
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*
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* Each monitoring context could have multiple targets. For example, a context
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* for virtual memory address spaces could have multiple target processes. The
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* @id of each target should be unique among the targets of the context. For
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* example, in the virtual address monitoring context, it could be a pidfd or
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* an address of an mm_struct.
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*/
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struct damon_target {
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unsigned long id;
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unsigned int nr_regions;
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struct list_head regions_list;
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struct list_head list;
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};
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/**
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* enum damos_action - Represents an action of a Data Access Monitoring-based
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* Operation Scheme.
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*
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* @DAMOS_WILLNEED: Call ``madvise()`` for the region with MADV_WILLNEED.
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* @DAMOS_COLD: Call ``madvise()`` for the region with MADV_COLD.
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* @DAMOS_PAGEOUT: Call ``madvise()`` for the region with MADV_PAGEOUT.
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* @DAMOS_HUGEPAGE: Call ``madvise()`` for the region with MADV_HUGEPAGE.
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* @DAMOS_NOHUGEPAGE: Call ``madvise()`` for the region with MADV_NOHUGEPAGE.
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* @DAMOS_STAT: Do nothing but count the stat.
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*/
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enum damos_action {
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DAMOS_WILLNEED,
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DAMOS_COLD,
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DAMOS_PAGEOUT,
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DAMOS_HUGEPAGE,
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DAMOS_NOHUGEPAGE,
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DAMOS_STAT, /* Do nothing but only record the stat */
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};
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/**
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* struct damos_quota - Controls the aggressiveness of the given scheme.
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* @ms: Maximum milliseconds that the scheme can use.
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* @sz: Maximum bytes of memory that the action can be applied.
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* @reset_interval: Charge reset interval in milliseconds.
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*
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* @weight_sz: Weight of the region's size for prioritization.
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* @weight_nr_accesses: Weight of the region's nr_accesses for prioritization.
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* @weight_age: Weight of the region's age for prioritization.
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*
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* To avoid consuming too much CPU time or IO resources for applying the
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* &struct damos->action to large memory, DAMON allows users to set time and/or
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* size quotas. The quotas can be set by writing non-zero values to &ms and
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* &sz, respectively. If the time quota is set, DAMON tries to use only up to
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* &ms milliseconds within &reset_interval for applying the action. If the
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* size quota is set, DAMON tries to apply the action only up to &sz bytes
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* within &reset_interval.
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*
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* Internally, the time quota is transformed to a size quota using estimated
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* throughput of the scheme's action. DAMON then compares it against &sz and
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* uses smaller one as the effective quota.
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*
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* For selecting regions within the quota, DAMON prioritizes current scheme's
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* target memory regions using the &struct damon_primitive->get_scheme_score.
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* You could customize the prioritization logic by setting &weight_sz,
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* &weight_nr_accesses, and &weight_age, because monitoring primitives are
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* encouraged to respect those.
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*/
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struct damos_quota {
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unsigned long ms;
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unsigned long sz;
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unsigned long reset_interval;
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unsigned int weight_sz;
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unsigned int weight_nr_accesses;
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unsigned int weight_age;
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/* private: */
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/* For throughput estimation */
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unsigned long total_charged_sz;
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unsigned long total_charged_ns;
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unsigned long esz; /* Effective size quota in bytes */
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/* For charging the quota */
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unsigned long charged_sz;
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unsigned long charged_from;
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struct damon_target *charge_target_from;
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unsigned long charge_addr_from;
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/* For prioritization */
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unsigned long histogram[DAMOS_MAX_SCORE + 1];
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unsigned int min_score;
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};
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/**
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* enum damos_wmark_metric - Represents the watermark metric.
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*
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* @DAMOS_WMARK_NONE: Ignore the watermarks of the given scheme.
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* @DAMOS_WMARK_FREE_MEM_RATE: Free memory rate of the system in [0,1000].
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*/
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enum damos_wmark_metric {
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DAMOS_WMARK_NONE,
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DAMOS_WMARK_FREE_MEM_RATE,
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};
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/**
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* struct damos_watermarks - Controls when a given scheme should be activated.
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* @metric: Metric for the watermarks.
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* @interval: Watermarks check time interval in microseconds.
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* @high: High watermark.
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* @mid: Middle watermark.
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* @low: Low watermark.
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*
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* If &metric is &DAMOS_WMARK_NONE, the scheme is always active. Being active
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* means DAMON does monitoring and applying the action of the scheme to
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* appropriate memory regions. Else, DAMON checks &metric of the system for at
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* least every &interval microseconds and works as below.
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*
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* If &metric is higher than &high, the scheme is inactivated. If &metric is
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* between &mid and &low, the scheme is activated. If &metric is lower than
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* &low, the scheme is inactivated.
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*/
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struct damos_watermarks {
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enum damos_wmark_metric metric;
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unsigned long interval;
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unsigned long high;
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unsigned long mid;
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unsigned long low;
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/* private: */
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bool activated;
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};
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/**
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* struct damos - Represents a Data Access Monitoring-based Operation Scheme.
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* @min_sz_region: Minimum size of target regions.
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* @max_sz_region: Maximum size of target regions.
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* @min_nr_accesses: Minimum ``->nr_accesses`` of target regions.
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* @max_nr_accesses: Maximum ``->nr_accesses`` of target regions.
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* @min_age_region: Minimum age of target regions.
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* @max_age_region: Maximum age of target regions.
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* @action: &damo_action to be applied to the target regions.
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* @quota: Control the aggressiveness of this scheme.
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* @wmarks: Watermarks for automated (in)activation of this scheme.
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* @stat_count: Total number of regions that this scheme is applied.
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* @stat_sz: Total size of regions that this scheme is applied.
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* @list: List head for siblings.
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*
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* For each aggregation interval, DAMON finds regions which fit in the
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* condition (&min_sz_region, &max_sz_region, &min_nr_accesses,
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* &max_nr_accesses, &min_age_region, &max_age_region) and applies &action to
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* those. To avoid consuming too much CPU time or IO resources for the
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* &action, "a is used.
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*
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* To do the work only when needed, schemes can be activated for specific
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* system situations using &wmarks. If all schemes that registered to the
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* monitoring context are inactive, DAMON stops monitoring either, and just
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* repeatedly checks the watermarks.
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*
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* If all schemes that registered to a &struct damon_ctx are inactive, DAMON
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* stops monitoring and just repeatedly checks the watermarks.
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*
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* After applying the &action to each region, &stat_count and &stat_sz is
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* updated to reflect the number of regions and total size of regions that the
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* &action is applied.
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*/
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struct damos {
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unsigned long min_sz_region;
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unsigned long max_sz_region;
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unsigned int min_nr_accesses;
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unsigned int max_nr_accesses;
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unsigned int min_age_region;
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unsigned int max_age_region;
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enum damos_action action;
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struct damos_quota quota;
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struct damos_watermarks wmarks;
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unsigned long stat_count;
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unsigned long stat_sz;
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struct list_head list;
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};
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struct damon_ctx;
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/**
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* struct damon_primitive - Monitoring primitives for given use cases.
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*
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* @init: Initialize primitive-internal data structures.
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* @update: Update primitive-internal data structures.
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* @prepare_access_checks: Prepare next access check of target regions.
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* @check_accesses: Check the accesses to target regions.
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* @reset_aggregated: Reset aggregated accesses monitoring results.
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* @get_scheme_score: Get the score of a region for a scheme.
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* @apply_scheme: Apply a DAMON-based operation scheme.
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* @target_valid: Determine if the target is valid.
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* @cleanup: Clean up the context.
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*
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* DAMON can be extended for various address spaces and usages. For this,
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* users should register the low level primitives for their target address
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* space and usecase via the &damon_ctx.primitive. Then, the monitoring thread
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* (&damon_ctx.kdamond) calls @init and @prepare_access_checks before starting
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* the monitoring, @update after each &damon_ctx.primitive_update_interval, and
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* @check_accesses, @target_valid and @prepare_access_checks after each
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* &damon_ctx.sample_interval. Finally, @reset_aggregated is called after each
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* &damon_ctx.aggr_interval.
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*
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* @init should initialize primitive-internal data structures. For example,
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* this could be used to construct proper monitoring target regions and link
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* those to @damon_ctx.adaptive_targets.
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* @update should update the primitive-internal data structures. For example,
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* this could be used to update monitoring target regions for current status.
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* @prepare_access_checks should manipulate the monitoring regions to be
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* prepared for the next access check.
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* @check_accesses should check the accesses to each region that made after the
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* last preparation and update the number of observed accesses of each region.
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* It should also return max number of observed accesses that made as a result
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* of its update. The value will be used for regions adjustment threshold.
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* @reset_aggregated should reset the access monitoring results that aggregated
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* by @check_accesses.
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* @get_scheme_score should return the priority score of a region for a scheme
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* as an integer in [0, &DAMOS_MAX_SCORE].
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* @apply_scheme is called from @kdamond when a region for user provided
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* DAMON-based operation scheme is found. It should apply the scheme's action
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* to the region. This is not used for &DAMON_ARBITRARY_TARGET case.
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* @target_valid should check whether the target is still valid for the
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* monitoring.
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* @cleanup is called from @kdamond just before its termination.
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*/
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struct damon_primitive {
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void (*init)(struct damon_ctx *context);
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void (*update)(struct damon_ctx *context);
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void (*prepare_access_checks)(struct damon_ctx *context);
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unsigned int (*check_accesses)(struct damon_ctx *context);
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void (*reset_aggregated)(struct damon_ctx *context);
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int (*get_scheme_score)(struct damon_ctx *context,
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struct damon_target *t, struct damon_region *r,
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struct damos *scheme);
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int (*apply_scheme)(struct damon_ctx *context, struct damon_target *t,
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struct damon_region *r, struct damos *scheme);
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bool (*target_valid)(void *target);
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void (*cleanup)(struct damon_ctx *context);
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};
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/**
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* struct damon_callback - Monitoring events notification callbacks.
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*
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* @before_start: Called before starting the monitoring.
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* @after_sampling: Called after each sampling.
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* @after_aggregation: Called after each aggregation.
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* @before_terminate: Called before terminating the monitoring.
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* @private: User private data.
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*
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* The monitoring thread (&damon_ctx.kdamond) calls @before_start and
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* @before_terminate just before starting and finishing the monitoring,
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* respectively. Therefore, those are good places for installing and cleaning
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* @private.
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*
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* The monitoring thread calls @after_sampling and @after_aggregation for each
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* of the sampling intervals and aggregation intervals, respectively.
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* Therefore, users can safely access the monitoring results without additional
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* protection. For the reason, users are recommended to use these callback for
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* the accesses to the results.
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*
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* If any callback returns non-zero, monitoring stops.
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*/
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struct damon_callback {
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void *private;
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int (*before_start)(struct damon_ctx *context);
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int (*after_sampling)(struct damon_ctx *context);
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int (*after_aggregation)(struct damon_ctx *context);
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void (*before_terminate)(struct damon_ctx *context);
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};
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/**
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* struct damon_ctx - Represents a context for each monitoring. This is the
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* main interface that allows users to set the attributes and get the results
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* of the monitoring.
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*
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* @sample_interval: The time between access samplings.
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* @aggr_interval: The time between monitor results aggregations.
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* @primitive_update_interval: The time between monitoring primitive updates.
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*
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* For each @sample_interval, DAMON checks whether each region is accessed or
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* not. It aggregates and keeps the access information (number of accesses to
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* each region) for @aggr_interval time. DAMON also checks whether the target
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* memory regions need update (e.g., by ``mmap()`` calls from the application,
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* in case of virtual memory monitoring) and applies the changes for each
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* @primitive_update_interval. All time intervals are in micro-seconds.
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* Please refer to &struct damon_primitive and &struct damon_callback for more
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* detail.
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*
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* @kdamond: Kernel thread who does the monitoring.
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* @kdamond_stop: Notifies whether kdamond should stop.
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* @kdamond_lock: Mutex for the synchronizations with @kdamond.
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*
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* For each monitoring context, one kernel thread for the monitoring is
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* created. The pointer to the thread is stored in @kdamond.
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*
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* Once started, the monitoring thread runs until explicitly required to be
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* terminated or every monitoring target is invalid. The validity of the
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* targets is checked via the &damon_primitive.target_valid of @primitive. The
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* termination can also be explicitly requested by writing non-zero to
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* @kdamond_stop. The thread sets @kdamond to NULL when it terminates.
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* Therefore, users can know whether the monitoring is ongoing or terminated by
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* reading @kdamond. Reads and writes to @kdamond and @kdamond_stop from
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* outside of the monitoring thread must be protected by @kdamond_lock.
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*
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* Note that the monitoring thread protects only @kdamond and @kdamond_stop via
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* @kdamond_lock. Accesses to other fields must be protected by themselves.
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*
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* @primitive: Set of monitoring primitives for given use cases.
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* @callback: Set of callbacks for monitoring events notifications.
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*
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* @min_nr_regions: The minimum number of adaptive monitoring regions.
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* @max_nr_regions: The maximum number of adaptive monitoring regions.
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* @adaptive_targets: Head of monitoring targets (&damon_target) list.
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* @schemes: Head of schemes (&damos) list.
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*/
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struct damon_ctx {
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unsigned long sample_interval;
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unsigned long aggr_interval;
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unsigned long primitive_update_interval;
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/* private: internal use only */
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struct timespec64 last_aggregation;
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struct timespec64 last_primitive_update;
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/* public: */
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struct task_struct *kdamond;
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struct mutex kdamond_lock;
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struct damon_primitive primitive;
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struct damon_callback callback;
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unsigned long min_nr_regions;
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unsigned long max_nr_regions;
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struct list_head adaptive_targets;
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struct list_head schemes;
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};
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#define damon_next_region(r) \
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(container_of(r->list.next, struct damon_region, list))
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#define damon_prev_region(r) \
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(container_of(r->list.prev, struct damon_region, list))
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#define damon_last_region(t) \
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(list_last_entry(&t->regions_list, struct damon_region, list))
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#define damon_for_each_region(r, t) \
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list_for_each_entry(r, &t->regions_list, list)
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#define damon_for_each_region_safe(r, next, t) \
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list_for_each_entry_safe(r, next, &t->regions_list, list)
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#define damon_for_each_target(t, ctx) \
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list_for_each_entry(t, &(ctx)->adaptive_targets, list)
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#define damon_for_each_target_safe(t, next, ctx) \
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list_for_each_entry_safe(t, next, &(ctx)->adaptive_targets, list)
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#define damon_for_each_scheme(s, ctx) \
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list_for_each_entry(s, &(ctx)->schemes, list)
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#define damon_for_each_scheme_safe(s, next, ctx) \
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list_for_each_entry_safe(s, next, &(ctx)->schemes, list)
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#ifdef CONFIG_DAMON
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struct damon_region *damon_new_region(unsigned long start, unsigned long end);
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inline void damon_insert_region(struct damon_region *r,
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struct damon_region *prev, struct damon_region *next,
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struct damon_target *t);
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void damon_add_region(struct damon_region *r, struct damon_target *t);
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void damon_destroy_region(struct damon_region *r, struct damon_target *t);
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struct damos *damon_new_scheme(
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unsigned long min_sz_region, unsigned long max_sz_region,
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unsigned int min_nr_accesses, unsigned int max_nr_accesses,
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unsigned int min_age_region, unsigned int max_age_region,
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enum damos_action action, struct damos_quota *quota,
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struct damos_watermarks *wmarks);
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void damon_add_scheme(struct damon_ctx *ctx, struct damos *s);
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void damon_destroy_scheme(struct damos *s);
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struct damon_target *damon_new_target(unsigned long id);
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void damon_add_target(struct damon_ctx *ctx, struct damon_target *t);
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bool damon_targets_empty(struct damon_ctx *ctx);
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void damon_free_target(struct damon_target *t);
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void damon_destroy_target(struct damon_target *t);
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unsigned int damon_nr_regions(struct damon_target *t);
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struct damon_ctx *damon_new_ctx(void);
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void damon_destroy_ctx(struct damon_ctx *ctx);
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int damon_set_targets(struct damon_ctx *ctx,
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unsigned long *ids, ssize_t nr_ids);
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int damon_set_attrs(struct damon_ctx *ctx, unsigned long sample_int,
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unsigned long aggr_int, unsigned long primitive_upd_int,
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unsigned long min_nr_reg, unsigned long max_nr_reg);
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int damon_set_schemes(struct damon_ctx *ctx,
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struct damos **schemes, ssize_t nr_schemes);
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int damon_nr_running_ctxs(void);
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int damon_start(struct damon_ctx **ctxs, int nr_ctxs);
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int damon_stop(struct damon_ctx **ctxs, int nr_ctxs);
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#endif /* CONFIG_DAMON */
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#ifdef CONFIG_DAMON_VADDR
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bool damon_va_target_valid(void *t);
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void damon_va_set_primitives(struct damon_ctx *ctx);
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#endif /* CONFIG_DAMON_VADDR */
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#ifdef CONFIG_DAMON_PADDR
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bool damon_pa_target_valid(void *t);
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void damon_pa_set_primitives(struct damon_ctx *ctx);
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#endif /* CONFIG_DAMON_PADDR */
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#endif /* _DAMON_H */
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