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| author | SeongJae Park <sj@kernel.org> | 2025-03-04 01:17:20 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-03-17 10:05:32 +0300 |
| commit | f04b0fedbe714f822bd066b319a60faa39a985a1 (patch) | |
| tree | 0da2f0055572de5388ddc6f7c0e6d3e70ff6b732 /include/linux | |
| parent | 1eb3471bf5749ff3769ec52723bd9b8d773c7a62 (diff) | |
| download | linux-f04b0fedbe714f822bd066b319a60faa39a985a1.tar.xz | |
mm/damon/core: implement intervals auto-tuning
Implement the DAMON sampling and aggregation intervals auto-tuning
mechanism as briefly described on 'struct damon_intervals_goal'. The core
part for deciding the direction and amount of the changes is implemented
reusing the feedback loop function which is being used for DAMOS quotas
auto-tuning. Unlike the DAMOS quotas auto-tuning use case, limit the
maximum decreasing amount after the adjustment to 50% of the current
value, though. This is because the intervals have no good merits at rapid
reductions since it could unnecessarily increase the monitoring overhead.
Link: https://lkml.kernel.org/r/20250303221726.484227-3-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/damon.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/damon.h b/include/linux/damon.h index 5f2609f24761..b3e2c793c1f4 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -713,6 +713,17 @@ struct damon_attrs { struct damon_intervals_goal intervals_goal; unsigned long min_nr_regions; unsigned long max_nr_regions; +/* private: internal use only */ + /* + * @aggr_interval to @sample_interval ratio. + * Core-external components call damon_set_attrs() with &damon_attrs + * that this field is unset. In the case, damon_set_attrs() sets this + * field of resulting &damon_attrs. Core-internal components such as + * kdamond_tune_intervals() calls damon_set_attrs() with &damon_attrs + * that this field is set. In the case, damon_set_attrs() just keep + * it. + */ + unsigned long aggr_samples; }; /** @@ -761,6 +772,11 @@ struct damon_ctx { * update */ unsigned long next_ops_update_sis; + /* + * number of sample intervals that should be passed before next + * intervals tuning + */ + unsigned long next_intervals_tune_sis; /* for waiting until the execution of the kdamond_fn is started */ struct completion kdamond_started; /* for scheme quotas prioritization */ |