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mm/damon: add trace event for effective size quota

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Aim-oriented DAMOS quota auto-tuning is an important and recommended
feature for DAMOS users.  Add a trace event for the observability of the
tuned quota and tuning itself.

[sj@kernel.org: initialize sidx in damos_trace_esz()]
  Link: https://lkml.kernel.org/r/20250705172003.52324-1-sj@kernel.org
[sj@kernel.org: make damos_esz unconditional trace event]
  Link: https://lkml.kernel.org/r/20250709182843.35812-1-sj@kernel.org
Link: https://lkml.kernel.org/r/20250704221408.38510-3-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: kernel test robot <lkp@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park
2025-07-04 15:14:08 -07:00
committed by Andrew Morton
parent 214db70287
commit a86d695193
2 changed files with 43 additions and 1 deletions
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24
include/trace/events/damon.h
View File

@@ -9,6 +9,30 @@
#include <linux/types.h>
#include <linux/tracepoint.h>
TRACE_EVENT(damos_esz,
TP_PROTO(unsigned int context_idx, unsigned int scheme_idx,
unsigned long esz),
TP_ARGS(context_idx, scheme_idx, esz),
TP_STRUCT__entry(
__field(unsigned int, context_idx)
__field(unsigned int, scheme_idx)
__field(unsigned long, esz)
),
TP_fast_assign(
__entry->context_idx = context_idx;
__entry->scheme_idx = scheme_idx;
__entry->esz = esz;
),
TP_printk("ctx_idx=%u scheme_idx=%u esz=%lu",
__entry->context_idx, __entry->scheme_idx,
__entry->esz)
);
TRACE_EVENT_CONDITION(damos_before_apply,
TP_PROTO(unsigned int context_idx, unsigned int scheme_idx,

20
mm/damon/core.c
View File

@@ -2011,12 +2011,26 @@ static void damos_set_effective_quota(struct damos_quota *quota)
quota->esz = esz;
}
static void damos_trace_esz(struct damon_ctx *c, struct damos *s,
struct damos_quota *quota)
{
unsigned int cidx = 0, sidx = 0;
struct damos *siter;
damon_for_each_scheme(siter, c) {
if (siter == s)
break;
sidx++;
}
trace_damos_esz(cidx, sidx, quota->esz);
}
static void damos_adjust_quota(struct damon_ctx *c, struct damos *s)
{
struct damos_quota *quota = &s->quota;
struct damon_target *t;
struct damon_region *r;
unsigned long cumulated_sz;
unsigned long cumulated_sz, cached_esz;
unsigned int score, max_score = 0;
if (!quota->ms && !quota->sz && list_empty(&quota->goals))
@@ -2030,7 +2044,11 @@ static void damos_adjust_quota(struct damon_ctx *c, struct damos *s)
quota->total_charged_sz += quota->charged_sz;
quota->charged_from = jiffies;
quota->charged_sz = 0;
if (trace_damos_esz_enabled())
cached_esz = quota->esz;
damos_set_effective_quota(quota);
if (trace_damos_esz_enabled() && quota->esz != cached_esz)
damos_trace_esz(c, s, quota);
}
if (!c->ops.get_scheme_score)