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mm/damon: explain "effective quota" on kernel-doc comment

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The kernel-doc comment for 'struct damos_quota' describes how "effective
quota" is calculated, but does not explain what it is.  Actually there was
an input[1] about it.  Add the explanation on the comment.

Also, fix a trivial typo on the comment block: s/empt/empty/

[1] https://github.com/damonitor/damo/issues/17#issuecomment-2497525043

Link: https://lkml.kernel.org/r/20250110185232.54907-6-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Suggested-by: Honggyu Kim <honggyu.kim@sk.com>
Cc: Yunjeong Mun <yunjeong.mun@sk.com>
Cc: Honggyu Kim <honggyu.kim@sk.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park
2025-01-10 10:52:32 -08:00
committed by Andrew Morton
parent d24393450b
commit d783cc5913
1 changed files with 9 additions and 4 deletions
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include/linux/damon.h
+9 -4
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@@ -193,11 +193,16 @@ struct damos_quota_goal {
* size quota is set, DAMON tries to apply the action only up to &sz bytes
* within &reset_interval.
*
* Internally, the time quota is transformed to a size quota using estimated
* throughput of the scheme's action. DAMON then compares it against &sz and
* uses smaller one as the effective quota.
* To convince the different types of quotas and goals, DAMON internally
* converts those into one single size quota called "effective quota". DAMON
* internally uses it as the only one real quota. The conversion is made as
* follows.
*
* If @goals is not empt, DAMON calculates yet another size quota based on the
* The time quota is transformed to a size quota using estimated throughput of
* the scheme's action. DAMON then compares it against &sz and uses smaller
* one as the effective quota.
*
* If @goals is not empty, DAMON calculates yet another size quota based on the
* goals using its internal feedback loop algorithm, for every @reset_interval.
* Then, if the new size quota is smaller than the effective quota, it uses the
* new size quota as the effective quota.