* [PATCH 00/12] mm/damon: introduce {,max_}nr_snapshots and tracepoint for damos stats
@ 2025-12-16 8:01 SeongJae Park
2025-12-16 8:01 ` [PATCH 12/12] mm/damon/core: add trace point for damos stat per apply interval SeongJae Park
0 siblings, 1 reply; 7+ messages in thread
From: SeongJae Park @ 2025-12-16 8:01 UTC (permalink / raw)
To: Andrew Morton
Cc: SeongJae Park, Liam R. Howlett, David Hildenbrand,
Jonathan Corbet, Lorenzo Stoakes, Masami Hiramatsu,
Mathieu Desnoyers, Michal Hocko, Mike Rapoport, Steven Rostedt,
Suren Baghdasaryan, Vlastimil Babka, damon, linux-doc,
linux-kernel, linux-mm, linux-trace-kernel
Introduce three changes for improving DAMOS stat's provided information,
deterministic control, and reading usability.
DAMOS provides stats that are important for understanding its behavior.
It lacks information about how many DAMON-generated monitoring output
snapshots it has worked on. Add a new stat, nr_snapshots, to show the
information.
Users can control DAMOS schemes in multiple ways. Using the online
parameters commit feature, they can install and uninstall DAMOS schemes
whenever they want while keeping DAMON runs. DAMOS quotas and
watermarks can be used for manually or automatically turning on/off or
adjusting the aggressiveness of the scheme. DAMOS filters can be used
for applying the scheme to specific memory entities based on their types
and locations. Some users want their DAMOS scheme to be applied to only
specific number of DAMON snapshots, for more deterministic control. One
example use case is tracepoint based snapshot reading. Add a new knob,
max_nr_snapshots, to support this. If the nr_snapshots parameter
becomes same to or greater than the value of this parameter, the scheme
is deactivated.
Users can read DAMOS stats via DAMON's sysfs interface. For deep level
investigations on environments having advanced tools like perf and
bpftrace, exposing the stats via a tracepoint can be useful. Implement
a new tracepoint, namely damon:damos_stat_after_apply_interval.
First five patches (patches 1-5) of this series implement the new stat,
nr_snapshots, on the core layer (patch 1), expose on DAMON sysfs user
interface (patch 2), and update documents (patches 3-5).
Following six patches (patches 6-11) are for the new stat based DAMOS
deactivation (max_nr_snapshots). The first one (patch 6) of this group
updates a kernel-doc comment before making further changes. Then an
implementation of it on the core layer (patch 7), an introduction of a
new DAMON sysfs interface file for users of the feature (patch 8), and
three updates of the documents (patches 9-11) follow.
The final one (patch 12) introduces the new tracepoint that exposes the
DAMOS stat values for each scheme apply interval.
Revision History
----------------
Changes from RFC
(https://lore.kernel.org/20251123184329.85287-1-sj@kernel.org)
- Check damos_stat tracepoint enablement inside the trace function.
- Update ABI document's 'Date:' fields.
- Slightly change series subject.
SeongJae Park (12):
mm/damon/core: introduce nr_snapshots damos stat
mm/damon/sysfs-schemes: introduce nr_snapshots damos stat file
Docs/mm/damon/design: update for nr_snapshots damos stat
Docs/admin-guide/mm/damon/usage: update for nr_snapshots damos stat
Docs/ABI/damon: update for nr_snapshots damos stat
mm/damon: update damos kerneldoc for stat field
mm/damon/core: implement max_nr_snapshots
mm/damon/sysfs-schemes: implement max_nr_snapshots file
Docs/mm/damon/design: update for max_nr_snapshots
Docs/admin-guide/mm/damon/usage: update for max_nr_snapshots
Docs/ABI/damon: update for max_nr_snapshots
mm/damon/core: add trace point for damos stat per apply interval
.../ABI/testing/sysfs-kernel-mm-damon | 13 ++++++
Documentation/admin-guide/mm/damon/usage.rst | 11 ++---
Documentation/mm/damon/design.rst | 7 +++
include/linux/damon.h | 12 ++++--
include/trace/events/damon.h | 41 ++++++++++++++++++
mm/damon/core.c | 39 +++++++++++++++--
mm/damon/sysfs-schemes.c | 43 +++++++++++++++++++
7 files changed, 155 insertions(+), 11 deletions(-)
base-commit: 37164b8fc049b9a72b3f0fa9bf3241e8852931a9
--
2.47.3
^ permalink raw reply [flat|nested] 7+ messages in thread
* [PATCH 12/12] mm/damon/core: add trace point for damos stat per apply interval
2025-12-16 8:01 [PATCH 00/12] mm/damon: introduce {,max_}nr_snapshots and tracepoint for damos stats SeongJae Park
@ 2025-12-16 8:01 ` SeongJae Park
2025-12-17 22:48 ` Steven Rostedt
0 siblings, 1 reply; 7+ messages in thread
From: SeongJae Park @ 2025-12-16 8:01 UTC (permalink / raw)
To: Andrew Morton
Cc: SeongJae Park, Masami Hiramatsu, Mathieu Desnoyers,
Steven Rostedt, damon, linux-kernel, linux-mm, linux-trace-kernel
DAMON users can read DAMOS stats via DAMON sysfs interface. It enables
efficient, simple and flexible usages of the stats. Especially for
systems not having advanced tools like perf or bpftrace, that can be
useful. But if the advanced tools are available, exposing the stats via
tracepoint can reduce unnecessary reimplementation of the wheels. Add a
new tracepoint for DAMOS stats, namely damos_stat_after_apply_interval.
The tracepoint is triggered for each scheme's apply interval and exposes
the whole stat values. If the user needs sub-apply interval information
for any chance, damos_before_apply tracepoint could be used.
Signed-off-by: SeongJae Park <sj@kernel.org>
---
include/trace/events/damon.h | 41 ++++++++++++++++++++++++++++++++++++
mm/damon/core.c | 17 +++++++++++++++
2 files changed, 58 insertions(+)
diff --git a/include/trace/events/damon.h b/include/trace/events/damon.h
index 852d725afea2..24fc402ab3c8 100644
--- a/include/trace/events/damon.h
+++ b/include/trace/events/damon.h
@@ -9,6 +9,47 @@
#include <linux/types.h>
#include <linux/tracepoint.h>
+TRACE_EVENT(damos_stat_after_apply_interval,
+
+ TP_PROTO(unsigned int context_idx, unsigned int scheme_idx,
+ struct damos_stat *stat),
+
+ TP_ARGS(context_idx, scheme_idx, stat),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, context_idx)
+ __field(unsigned int, scheme_idx)
+ __field(unsigned long, nr_tried)
+ __field(unsigned long, sz_tried)
+ __field(unsigned long, nr_applied)
+ __field(unsigned long, sz_applied)
+ __field(unsigned long, sz_ops_filter_passed)
+ __field(unsigned long, qt_exceeds)
+ __field(unsigned long, nr_snapshots)
+ ),
+
+ TP_fast_assign(
+ __entry->context_idx = context_idx;
+ __entry->scheme_idx = scheme_idx;
+ __entry->nr_tried = stat->nr_tried;
+ __entry->sz_tried = stat->sz_tried;
+ __entry->nr_applied = stat->nr_applied;
+ __entry->sz_applied = stat->sz_applied;
+ __entry->sz_ops_filter_passed = stat->sz_ops_filter_passed;
+ __entry->qt_exceeds = stat->qt_exceeds;
+ __entry->nr_snapshots = stat->nr_snapshots;
+ ),
+
+ TP_printk("ctx_idx=%u scheme_idx=%u nr_tried=%lu sz_tried=%lu "
+ "nr_applied=%lu sz_tried=%lu sz_ops_filter_passed=%lu "
+ "qt_exceeds=%lu nr_snapshots=%lu",
+ __entry->context_idx, __entry->scheme_idx,
+ __entry->nr_tried, __entry->sz_tried,
+ __entry->nr_applied, __entry->sz_applied,
+ __entry->sz_ops_filter_passed, __entry->qt_exceeds,
+ __entry->nr_snapshots)
+);
+
TRACE_EVENT(damos_esz,
TP_PROTO(unsigned int context_idx, unsigned int scheme_idx,
diff --git a/mm/damon/core.c b/mm/damon/core.c
index 8908aec6670f..68dd2f7acba2 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -2256,6 +2256,22 @@ static void damos_adjust_quota(struct damon_ctx *c, struct damos *s)
quota->min_score = score;
}
+static void damos_trace_stat(struct damon_ctx *c, struct damos *s)
+{
+ unsigned int cidx = 0, sidx = 0;
+ struct damos *siter;
+
+ if (!trace_damos_stat_after_apply_interval_enabled())
+ return;
+
+ damon_for_each_scheme(siter, c) {
+ if (siter == s)
+ break;
+ sidx++;
+ }
+ trace_damos_stat_after_apply_interval(cidx, sidx, &s->stat);
+}
+
static void kdamond_apply_schemes(struct damon_ctx *c)
{
struct damon_target *t;
@@ -2297,6 +2313,7 @@ static void kdamond_apply_schemes(struct damon_ctx *c)
(s->apply_interval_us ? s->apply_interval_us :
c->attrs.aggr_interval) / sample_interval;
s->last_applied = NULL;
+ damos_trace_stat(c, s);
}
mutex_unlock(&c->walk_control_lock);
}
--
2.47.3
^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH 12/12] mm/damon/core: add trace point for damos stat per apply interval
2025-12-16 8:01 ` [PATCH 12/12] mm/damon/core: add trace point for damos stat per apply interval SeongJae Park
@ 2025-12-17 22:48 ` Steven Rostedt
2025-12-17 23:52 ` SeongJae Park
0 siblings, 1 reply; 7+ messages in thread
From: Steven Rostedt @ 2025-12-17 22:48 UTC (permalink / raw)
To: SeongJae Park
Cc: Andrew Morton, Masami Hiramatsu, Mathieu Desnoyers, damon,
linux-kernel, linux-mm, linux-trace-kernel
On Tue, 16 Dec 2025 00:01:25 -0800
SeongJae Park <sj@kernel.org> wrote:
> + TP_printk("ctx_idx=%u scheme_idx=%u nr_tried=%lu sz_tried=%lu "
> + "nr_applied=%lu sz_tried=%lu sz_ops_filter_passed=%lu "
> + "qt_exceeds=%lu nr_snapshots=%lu",
Nit, but it's been stated that strings should not be broken up because of
the column limit.
> + __entry->context_idx, __entry->scheme_idx,
> + __entry->nr_tried, __entry->sz_tried,
> + __entry->nr_applied, __entry->sz_applied,
> + __entry->sz_ops_filter_passed, __entry->qt_exceeds,
> + __entry->nr_snapshots)
> +);
> +
> TRACE_EVENT(damos_esz,
>
> TP_PROTO(unsigned int context_idx, unsigned int scheme_idx,
> diff --git a/mm/damon/core.c b/mm/damon/core.c
> index 8908aec6670f..68dd2f7acba2 100644
> --- a/mm/damon/core.c
> +++ b/mm/damon/core.c
> @@ -2256,6 +2256,22 @@ static void damos_adjust_quota(struct damon_ctx *c, struct damos *s)
> quota->min_score = score;
> }
>
> +static void damos_trace_stat(struct damon_ctx *c, struct damos *s)
> +{
> + unsigned int cidx = 0, sidx = 0;
> + struct damos *siter;
> +
> + if (!trace_damos_stat_after_apply_interval_enabled())
> + return;
Other than that, from a tracing POV:
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
-- Steve
> +
> + damon_for_each_scheme(siter, c) {
> + if (siter == s)
> + break;
> + sidx++;
> + }
> + trace_damos_stat_after_apply_interval(cidx, sidx, &s->stat);
> +}
> +
> static void kdamond_apply_schemes(struct damon_ctx *c)
> {
> struct damon_target *t;
> @@ -2297,6 +2313,7 @@ static void kdamond_apply_schemes(struct damon_ctx *c)
> (s->apply_interval_us ? s->apply_interval_us :
> c->attrs.aggr_interval) / sample_interval;
> s->last_applied = NULL;
> + damos_trace_stat(c, s);
> }
> mutex_unlock(&c->walk_control_lock);
> }
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH 12/12] mm/damon/core: add trace point for damos stat per apply interval
2025-12-17 22:48 ` Steven Rostedt
@ 2025-12-17 23:52 ` SeongJae Park
2025-12-18 2:29 ` Andrew Morton
0 siblings, 1 reply; 7+ messages in thread
From: SeongJae Park @ 2025-12-17 23:52 UTC (permalink / raw)
To: Steven Rostedt
Cc: SeongJae Park, Andrew Morton, Masami Hiramatsu, Mathieu Desnoyers,
damon, linux-kernel, linux-mm, linux-trace-kernel
On Wed, 17 Dec 2025 17:48:51 -0500 Steven Rostedt <rostedt@goodmis.org> wrote:
> On Tue, 16 Dec 2025 00:01:25 -0800
> SeongJae Park <sj@kernel.org> wrote:
>
> > + TP_printk("ctx_idx=%u scheme_idx=%u nr_tried=%lu sz_tried=%lu "
> > + "nr_applied=%lu sz_tried=%lu sz_ops_filter_passed=%lu "
> > + "qt_exceeds=%lu nr_snapshots=%lu",
>
> Nit, but it's been stated that strings should not be broken up because of
> the column limit.
I also found checkpatch.pl shows warning for that. I was ignoring that since I
was thinking that's just a recommendation. But as I got more than one warning,
now I'd like to fix this.
Andrew, could you please add below attaching fixup patch?
>
> > + __entry->context_idx, __entry->scheme_idx,
> > + __entry->nr_tried, __entry->sz_tried,
> > + __entry->nr_applied, __entry->sz_applied,
> > + __entry->sz_ops_filter_passed, __entry->qt_exceeds,
> > + __entry->nr_snapshots)
> > +);
> > +
> > TRACE_EVENT(damos_esz,
> >
> > TP_PROTO(unsigned int context_idx, unsigned int scheme_idx,
> > diff --git a/mm/damon/core.c b/mm/damon/core.c
> > index 8908aec6670f..68dd2f7acba2 100644
> > --- a/mm/damon/core.c
> > +++ b/mm/damon/core.c
> > @@ -2256,6 +2256,22 @@ static void damos_adjust_quota(struct damon_ctx *c, struct damos *s)
> > quota->min_score = score;
> > }
> >
> > +static void damos_trace_stat(struct damon_ctx *c, struct damos *s)
> > +{
> > + unsigned int cidx = 0, sidx = 0;
> > + struct damos *siter;
> > +
> > + if (!trace_damos_stat_after_apply_interval_enabled())
> > + return;
>
> Other than that, from a tracing POV:
>
> Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Thank you! :)
Thanks,
SJ
[...]
=== >8 ===
From 67a7762ee1ade258c53913ea4ecf9bafd4746ea9 Mon Sep 17 00:00:00 2001
From: SeongJae Park <sj@kernel.org>
Date: Wed, 17 Dec 2025 15:42:06 -0800
Subject: [PATCH] mm/damon: do not break the string for damos_stat tracepoint
The format string for damos_stat tracepoint is broken up to multiple
lines. Strings shouldn't be broken up due to the column limit, though.
Update the string to be put on a single line.
Suggested-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: SeongJae Park <sj@kernel.org>
---
include/trace/events/damon.h | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/include/trace/events/damon.h b/include/trace/events/damon.h
index 24fc402ab3c8..bf25ee07cb48 100644
--- a/include/trace/events/damon.h
+++ b/include/trace/events/damon.h
@@ -40,9 +40,7 @@ TRACE_EVENT(damos_stat_after_apply_interval,
__entry->nr_snapshots = stat->nr_snapshots;
),
- TP_printk("ctx_idx=%u scheme_idx=%u nr_tried=%lu sz_tried=%lu "
- "nr_applied=%lu sz_tried=%lu sz_ops_filter_passed=%lu "
- "qt_exceeds=%lu nr_snapshots=%lu",
+ TP_printk("ctx_idx=%u scheme_idx=%u nr_tried=%lu sz_tried=%lu nr_applied=%lu sz_tried=%lu sz_ops_filter_passed=%lu qt_exceeds=%lu nr_snapshots=%lu",
__entry->context_idx, __entry->scheme_idx,
__entry->nr_tried, __entry->sz_tried,
__entry->nr_applied, __entry->sz_applied,
--
2.47.3
^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH 12/12] mm/damon/core: add trace point for damos stat per apply interval
2025-12-17 23:52 ` SeongJae Park
@ 2025-12-18 2:29 ` Andrew Morton
2025-12-18 3:04 ` SeongJae Park
2025-12-18 17:29 ` Steven Rostedt
0 siblings, 2 replies; 7+ messages in thread
From: Andrew Morton @ 2025-12-18 2:29 UTC (permalink / raw)
To: SeongJae Park
Cc: Steven Rostedt, Masami Hiramatsu, Mathieu Desnoyers, damon,
linux-kernel, linux-mm, linux-trace-kernel
On Wed, 17 Dec 2025 15:52:18 -0800 SeongJae Park <sj@kernel.org> wrote:
> On Wed, 17 Dec 2025 17:48:51 -0500 Steven Rostedt <rostedt@goodmis.org> wrote:
>
> > On Tue, 16 Dec 2025 00:01:25 -0800
> > SeongJae Park <sj@kernel.org> wrote:
> >
> > > + TP_printk("ctx_idx=%u scheme_idx=%u nr_tried=%lu sz_tried=%lu "
> > > + "nr_applied=%lu sz_tried=%lu sz_ops_filter_passed=%lu "
> > > + "qt_exceeds=%lu nr_snapshots=%lu",
> >
> > Nit, but it's been stated that strings should not be broken up because of
> > the column limit.
screw the rules
> --- a/include/trace/events/damon.h
> +++ b/include/trace/events/damon.h
> @@ -40,9 +40,7 @@ TRACE_EVENT(damos_stat_after_apply_interval,
> __entry->nr_snapshots = stat->nr_snapshots;
> ),
>
> - TP_printk("ctx_idx=%u scheme_idx=%u nr_tried=%lu sz_tried=%lu "
> - "nr_applied=%lu sz_tried=%lu sz_ops_filter_passed=%lu "
> - "qt_exceeds=%lu nr_snapshots=%lu",
> + TP_printk("ctx_idx=%u scheme_idx=%u nr_tried=%lu sz_tried=%lu nr_applied=%lu sz_tried=%lu sz_ops_filter_passed=%lu qt_exceeds=%lu nr_snapshots=%lu",
> __entry->context_idx, __entry->scheme_idx,
> __entry->nr_tried, __entry->sz_tried,
> __entry->nr_applied, __entry->sz_applied,
because that's just crazy. Let's use some judgment here!
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH 12/12] mm/damon/core: add trace point for damos stat per apply interval
2025-12-18 2:29 ` Andrew Morton
@ 2025-12-18 3:04 ` SeongJae Park
2025-12-18 17:29 ` Steven Rostedt
1 sibling, 0 replies; 7+ messages in thread
From: SeongJae Park @ 2025-12-18 3:04 UTC (permalink / raw)
To: Andrew Morton
Cc: SeongJae Park, Steven Rostedt, Masami Hiramatsu,
Mathieu Desnoyers, damon, linux-kernel, linux-mm,
linux-trace-kernel
On Wed, 17 Dec 2025 18:29:15 -0800 Andrew Morton <akpm@linux-foundation.org> wrote:
> On Wed, 17 Dec 2025 15:52:18 -0800 SeongJae Park <sj@kernel.org> wrote:
>
> > On Wed, 17 Dec 2025 17:48:51 -0500 Steven Rostedt <rostedt@goodmis.org> wrote:
> >
> > > On Tue, 16 Dec 2025 00:01:25 -0800
> > > SeongJae Park <sj@kernel.org> wrote:
> > >
> > > > + TP_printk("ctx_idx=%u scheme_idx=%u nr_tried=%lu sz_tried=%lu "
> > > > + "nr_applied=%lu sz_tried=%lu sz_ops_filter_passed=%lu "
> > > > + "qt_exceeds=%lu nr_snapshots=%lu",
> > >
> > > Nit, but it's been stated that strings should not be broken up because of
> > > the column limit.
>
> screw the rules
>
> > --- a/include/trace/events/damon.h
> > +++ b/include/trace/events/damon.h
> > @@ -40,9 +40,7 @@ TRACE_EVENT(damos_stat_after_apply_interval,
> > __entry->nr_snapshots = stat->nr_snapshots;
> > ),
> >
> > - TP_printk("ctx_idx=%u scheme_idx=%u nr_tried=%lu sz_tried=%lu "
> > - "nr_applied=%lu sz_tried=%lu sz_ops_filter_passed=%lu "
> > - "qt_exceeds=%lu nr_snapshots=%lu",
> > + TP_printk("ctx_idx=%u scheme_idx=%u nr_tried=%lu sz_tried=%lu nr_applied=%lu sz_tried=%lu sz_ops_filter_passed=%lu qt_exceeds=%lu nr_snapshots=%lu",
> > __entry->context_idx, __entry->scheme_idx,
> > __entry->nr_tried, __entry->sz_tried,
> > __entry->nr_applied, __entry->sz_applied,
>
> because that's just crazy. Let's use some judgment here!
I'm fine with either direction. So I understand you want to just keep the
original patch without this fixup, and therefore no action is needed from my
side? Let me know if I'm getting anything wrong.
Thanks,
SJ
[...]
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH 12/12] mm/damon/core: add trace point for damos stat per apply interval
2025-12-18 2:29 ` Andrew Morton
2025-12-18 3:04 ` SeongJae Park
@ 2025-12-18 17:29 ` Steven Rostedt
1 sibling, 0 replies; 7+ messages in thread
From: Steven Rostedt @ 2025-12-18 17:29 UTC (permalink / raw)
To: Andrew Morton
Cc: SeongJae Park, Masami Hiramatsu, Mathieu Desnoyers, damon,
linux-kernel, linux-mm, linux-trace-kernel
On Wed, 17 Dec 2025 18:29:15 -0800
Andrew Morton <akpm@linux-foundation.org> wrote:
> > > Nit, but it's been stated that strings should not be broken up because of
> > > the column limit.
>
> screw the rules
Heh.
>
> > --- a/include/trace/events/damon.h
> > +++ b/include/trace/events/damon.h
> > @@ -40,9 +40,7 @@ TRACE_EVENT(damos_stat_after_apply_interval,
> > __entry->nr_snapshots = stat->nr_snapshots;
> > ),
> >
> > - TP_printk("ctx_idx=%u scheme_idx=%u nr_tried=%lu sz_tried=%lu "
> > - "nr_applied=%lu sz_tried=%lu sz_ops_filter_passed=%lu "
> > - "qt_exceeds=%lu nr_snapshots=%lu",
> > + TP_printk("ctx_idx=%u scheme_idx=%u nr_tried=%lu sz_tried=%lu nr_applied=%lu sz_tried=%lu sz_ops_filter_passed=%lu qt_exceeds=%lu nr_snapshots=%lu",
> > __entry->context_idx, __entry->scheme_idx,
> > __entry->nr_tried, __entry->sz_tried,
> > __entry->nr_applied, __entry->sz_applied,
>
> because that's just crazy. Let's use some judgment here!
Does it really matter? Actually, I prefer this way because it better shows
where the format ends and the parameters start. I care more about the
parameters than the format string, except to look for each "%*" value.
-- Steve
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2025-12-18 17:28 UTC | newest]
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2025-12-16 8:01 [PATCH 00/12] mm/damon: introduce {,max_}nr_snapshots and tracepoint for damos stats SeongJae Park
2025-12-16 8:01 ` [PATCH 12/12] mm/damon/core: add trace point for damos stat per apply interval SeongJae Park
2025-12-17 22:48 ` Steven Rostedt
2025-12-17 23:52 ` SeongJae Park
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