From: SeongJae Park <sj@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: SeongJae Park <sj@kernel.org>,
damon@lists.linux.dev, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 06/20] mm/damon: move comments and fields for damos-quota-prioritization to the end
Date: Mon, 19 Feb 2024 11:44:17 -0800 [thread overview]
Message-ID: <20240219194431.159606-7-sj@kernel.org> (raw)
In-Reply-To: <20240219194431.159606-1-sj@kernel.org>
The comments and definition of 'struct damos_quota' lists a few fields
for effective quota generation first, fields for regions prioritization
under the quota, and then remaining fields for effective quota
generation. Readers' should unnecesssarily switch their context in the
middle. List all the fields for the effective quota first, and then
fields for the prioritization for making it easier to read.
Signed-off-by: SeongJae Park <sj@kernel.org>
---
include/linux/damon.h | 30 ++++++++++++++----------------
1 file changed, 14 insertions(+), 16 deletions(-)
diff --git a/include/linux/damon.h b/include/linux/damon.h
index 93ef45b87b9c..bd17b14828bc 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -128,18 +128,17 @@ enum damos_action {
/**
* struct damos_quota - Controls the aggressiveness of the given scheme.
+ * @reset_interval: Charge reset interval in milliseconds.
* @ms: Maximum milliseconds that the scheme can use.
* @sz: Maximum bytes of memory that the action can be applied.
- * @reset_interval: Charge reset interval in milliseconds.
+ * @get_score: Feedback function for self-tuning quota.
+ * @get_score_arg: Parameter for @get_score
+ * @esz: Effective size quota in bytes.
*
* @weight_sz: Weight of the region's size for prioritization.
* @weight_nr_accesses: Weight of the region's nr_accesses for prioritization.
* @weight_age: Weight of the region's age for prioritization.
*
- * @get_score: Feedback function for self-tuning quota.
- * @get_score_arg: Parameter for @get_score
- * @esz: Effective size quota in bytes.
- *
* To avoid consuming too much CPU time or IO resources for applying the
* &struct damos->action to large memory, DAMON allows users to set time and/or
* size quotas. The quotas can be set by writing non-zero values to &ms and
@@ -152,12 +151,6 @@ enum damos_action {
* throughput of the scheme's action. DAMON then compares it against &sz and
* uses smaller one as the effective quota.
*
- * For selecting regions within the quota, DAMON prioritizes current scheme's
- * target memory regions using the &struct damon_operations->get_scheme_score.
- * You could customize the prioritization logic by setting &weight_sz,
- * &weight_nr_accesses, and &weight_age, because monitoring operations are
- * encouraged to respect those.
- *
* If @get_score function pointer is set, DAMON calls it back with
* @get_score_arg and get the return value of it for every @reset_interval.
* Then, DAMON adjusts the effective quota using the return value as a feedback
@@ -170,20 +163,25 @@ enum damos_action {
* set, the mechanism starts from the quota of one byte.
*
* The resulting effective size quota in bytes is set to @esz.
+ *
+ * For selecting regions within the quota, DAMON prioritizes current scheme's
+ * target memory regions using the &struct damon_operations->get_scheme_score.
+ * You could customize the prioritization logic by setting &weight_sz,
+ * &weight_nr_accesses, and &weight_age, because monitoring operations are
+ * encouraged to respect those.
*/
struct damos_quota {
+ unsigned long reset_interval;
unsigned long ms;
unsigned long sz;
- unsigned long reset_interval;
+ unsigned long (*get_score)(void *arg);
+ void *get_score_arg;
+ unsigned long esz;
unsigned int weight_sz;
unsigned int weight_nr_accesses;
unsigned int weight_age;
- unsigned long (*get_score)(void *arg);
- void *get_score_arg;
- unsigned long esz;
-
/* private: */
/* For throughput estimation */
unsigned long total_charged_sz;
--
2.39.2
next prev parent reply other threads:[~2024-02-19 19:44 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-19 19:44 [PATCH 00/20] mm/damon: let DAMOS feeds and tame/auto-tune itself SeongJae Park
2024-02-19 19:44 ` [PATCH 01/20] mm/damon/core: Set damos_quota->esz as public field and document SeongJae Park
2024-02-19 19:44 ` [PATCH 02/20] mm/damon/sysfs-schemes: implement quota effective_bytes file SeongJae Park
2024-02-19 19:44 ` [PATCH 03/20] mm/damon/sysfs: implement a kdamond command for updating schemes' effective quotas SeongJae Park
2024-02-19 19:44 ` [PATCH 04/20] Docs/ABI/damon: document effective_bytes sysfs file SeongJae Park
2024-02-19 19:44 ` [PATCH 05/20] Docs/admin-guide/mm/damon/usage: document effective_bytes file SeongJae Park
2024-02-19 19:44 ` SeongJae Park [this message]
2024-02-19 19:44 ` [PATCH 07/20] mm/damon/core: split out quota goal related fields to a struct SeongJae Park
2024-02-19 19:44 ` [PATCH 08/20] mm/damon/core: add multiple goals per damos_quota and helpers for those SeongJae Park
2024-02-19 19:44 ` [PATCH 09/20] mm/damon/sysfs: use only quota->goals SeongJae Park
2024-02-19 19:44 ` [PATCH 10/20] mm/damon/core: remove ->goal field of damos_quota SeongJae Park
2024-02-19 19:44 ` [PATCH 11/20] mm/damon/core: let goal specified with only target and current values SeongJae Park
2024-02-19 19:44 ` [PATCH 12/20] mm/damon/core: support multiple metrics for quota goal SeongJae Park
2024-02-19 19:44 ` [PATCH 13/20] mm/damon/core: implement PSI metric DAMOS " SeongJae Park
2024-02-19 19:44 ` [PATCH 14/20] mm/damon/sysfs-schemes: support PSI-based quota auto-tune SeongJae Park
2024-02-19 19:44 ` [PATCH 15/20] Docs/mm/damon/design: document quota goal self-tuning SeongJae Park
2024-02-19 19:44 ` [PATCH 16/20] Docs/ABI/damon: document quota goal metric file SeongJae Park
2024-02-19 19:44 ` [PATCH 17/20] Docs/admin-guide/mm/damon/usage: " SeongJae Park
2024-02-19 19:44 ` [PATCH 18/20] mm/damon/reclaim: implement user-feedback driven quota auto-tuning SeongJae Park
2024-02-19 19:44 ` [PATCH 19/20] mm/damon/reclaim: implement memory PSI-driven quota self-tuning SeongJae Park
2024-02-19 19:44 ` [PATCH 20/20] Docs/admin-guide/mm/damon/reclaim: document auto-tuning parameters SeongJae Park
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20240219194431.159606-7-sj@kernel.org \
--to=sj@kernel.org \
--cc=akpm@linux-foundation.org \
--cc=damon@lists.linux.dev \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®