linux-kernel - [RFC PATCH] mm/damon: explain "effective quota" on kernel-doc comment

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-Id: <20241126002921.50035-1-sj@kernel.org>
Date: Mon, 25 Nov 2024 16:29:21 -0800
From: SeongJae Park <sj@...nel.org>
To: 
Cc: SeongJae Park <sj@...nel.org>,
	damon@...ts.linux.dev,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Yunjeong Mun <yunjeong.mun@...com>,
	Honggyu Kim <honggyu.kim@...com>
Subject: [RFC PATCH] mm/damon: explain "effective quota" on kernel-doc comment

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.

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

Cc: Yunjeong Mun <yunjeong.mun@...com>
Cc: Honggyu Kim <honggyu.kim@...com>
Signed-off-by: SeongJae Park <sj@...nel.org>
---
 include/linux/damon.h | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/include/linux/damon.h b/include/linux/damon.h
index a67f2c4940e9..a01bfe2ff616 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -193,9 +193,13 @@ 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 only one real quota.  The convert is made as follows.
+ *
+ * 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 empt, DAMON calculates yet another size quota based on the
  * goals using its internal feedback loop algorithm, for every @reset_interval.
-- 
2.39.5