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b=spSgCZBlv4Hw/H2wyZrkqs9weh8VNtljwJlInhjXMHp673abph/08TnrZHosupZl5 HRXgvXApLzfbzFhDrDX+TT6poh+nVz7hMM/IpOkO2h690KQqsPfJ+xoKDUB1Yf3uqI zuU3zFXMDtcn1WU6O17k7dy3Liz3xcCFiiACcUWoPzZvf6arPSEkYuIQVQrq6NY0D/ 5IbhcHhGzsb3QZv4BzpIPxPc4dORLDFo8kW066JPz9i08qlhJSObnhefma5HAVFVT/ iFbVG60r0Dznc2myihg9RO1m/LiOJRBvM+iuN69Kn5nMqxiwlYiJBJ0zZWSmxGU0ip F1rH8Cj/gsphw== From: SeongJae Park To: Cc: SeongJae Park , Andrew Morton , Masami Hiramatsu , Mathieu Desnoyers , Steven Rostedt , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org Subject: [RFC PATCH v2 18/28] mm/damon: trace probe_hits Date: Tue, 12 May 2026 07:36:33 -0700 Message-ID: <20260512143645.113201-19-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260512143645.113201-1-sj@kernel.org> References: <20260512143645.113201-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: B52E4A0009 X-Stat-Signature: nj4w78s84x3yo6qirqdzsi633bef4xer X-Rspam-User: X-HE-Tag: 1778596624-439147 X-HE-Meta: U2FsdGVkX199pXEOP2YsdA40kOp/04jt1WTjVmj0p3yMJL4/cZRWYphVpm4O2WpB4TAXkcyNQjlIgSpSdt6b/r9hOLdmdzpRplHp1r5Nj23XBMCIZYnmrEqQkW9TMr2J7vATiDLWeR0DMi2F9KEkNDF9dtcBr1l3yRn90VTI8aqQrtF6z++EHQwPIZBhopUaSbXucKU/my+N0hmjTvqL0vMMabTSOCjmrQqqBBH1sioAsTmfDQy/7e/QDFnu1nUadHtOolj6MM6+4n38HujZQvH5JKaHtIiOn+C+bbwlYJQLu/t3CCKMttPLd8v3yLJr+VdELhFbl46XSbHaiJAybJgBmz3Z7GGGo1i+COGl5lw6NIGCMsEcBi0y67mwZFRQ05tYic78aLsMjPCJqYXERT6lyH4mYpvzUdkhQnW8lGcYOS4eNoPm+TpZjoyKhJ+56Op/niFBlbIEuedzkpT394jhMqbwEmqd/gI0Ov1/aO/BHZ7IZijxWS0cyYY7hvFe8aIGY0Q2qk4xzQk1z9//gi00WQOlqNLXYtXH9aIpr7w2BZSie5On5PuMLfRxW3gcN4NtDXcxiXaPJEJ4VbRYnkIL+6gFKAFmmuu1nTL97LsNKLurwxwMPc8HRIYjnuq7p0VFPfI+dJfxN/TJ4vveXtT/5FOFcgTlXAi7KIOpQ356ibHNV00QOcPoJGzSJU68xvA57124wkYVz1PdlaxPPJ/G/VnE3TwnAgsC7CLwKL5r62wNPXDmvwKCcL49Wb+P2Jl5HGF87AoE+QMKcsdSlbRQzSKFPO3osEmWj/xDPu4rxCtdUSE17xVndx5BaKUFJXj5gy/OmXK3aYo8cSRxZCVBiHngyrXnDvXXqHl/tblGQKzpZ9kn73hlLUr2vEmqitb5NiZsz0ssoBZeZYBup2TazWdCl2Zv09lu/hMYhe66UTb2HqI+WNmR9fUXqyqam+/wYXQZ3EYlRXcqWrO e6Ec4E/8 k3kQft8jElb/fA/gvsIfRM2uv5qv5j9IdmQAhSUp/rwYhK6VuMwzEOjxuFGzJMMPZcXKZngE0na0j1S0sNS1sS9xYNkXtBOD6lMpCCz6Mpq+sm5LcfNO/h0x8LFVsOBmPuguNp3HwxmNZNNYZdMnAQ1/u34qj0davxZXwwWyftBQj2IprCLyAy/nt7siIRaFxobhlKrmxPC6wlC3cX/fB53Ns9wQg7s4DjftokByC9sZNyFzUv8m2C+AbN18WaLpLDsqfl/AGvJCqDOmLgcP+XRUJ7Q== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Introduce a new tracepoint for exposing the per-region per-probe positive sample count via tracefs. Signed-off-by: SeongJae Park --- include/trace/events/damon.h | 36 ++++++++++++++++++++++++++++++++++++ mm/damon/core.c | 7 +++++++ 2 files changed, 43 insertions(+) diff --git a/include/trace/events/damon.h b/include/trace/events/damon.h index 7e25f4469b81b..d7b94c7640217 100644 --- a/include/trace/events/damon.h +++ b/include/trace/events/damon.h @@ -130,6 +130,42 @@ TRACE_EVENT(damon_monitor_intervals_tune, TP_printk("sample_us=%lu", __entry->sample_us) ); +TRACE_EVENT(damon_aggregated_v2, + + TP_PROTO(unsigned int target_id, struct damon_region *r, + unsigned int nr_regions, unsigned int nr_probes), + + TP_ARGS(target_id, r, nr_regions, nr_probes), + + TP_STRUCT__entry( + __field(unsigned long, target_id) + __field(unsigned long, start) + __field(unsigned long, end) + __field(unsigned int, nr_regions) + __field(unsigned int, nr_accesses) + __field(unsigned int, age) + __dynamic_array(unsigned char, probe_hits, nr_probes) + ), + + TP_fast_assign( + __entry->target_id = target_id; + __entry->start = r->ar.start; + __entry->end = r->ar.end; + __entry->nr_regions = nr_regions; + __entry->nr_accesses = r->nr_accesses; + __entry->age = r->age; + memcpy(__get_dynamic_array(probe_hits), r->probe_hits, + sizeof(*r->probe_hits) * nr_probes); + ), + + TP_printk("target_id=%lu nr_regions=%u %lu-%lu: %u %u probe_hits=%s", + __entry->target_id, __entry->nr_regions, + __entry->start, __entry->end, + __entry->nr_accesses, __entry->age, + __print_hex(__get_dynamic_array(probe_hits), + __get_dynamic_array_len(probe_hits))) +); + TRACE_EVENT(damon_aggregated, TP_PROTO(unsigned int target_id, struct damon_region *r, diff --git a/mm/damon/core.c b/mm/damon/core.c index fe6c789f2cecb..14b15c9876516 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -1905,6 +1905,11 @@ static void kdamond_reset_aggregated(struct damon_ctx *c) { struct damon_target *t; unsigned int ti = 0; /* target's index */ + unsigned int nr_probes = 0; + struct damon_probe *probe; + + damon_for_each_probe(probe, c) + nr_probes++; damon_for_each_target(t, c) { struct damon_region *r; @@ -1913,6 +1918,8 @@ static void kdamond_reset_aggregated(struct damon_ctx *c) int i; trace_damon_aggregated(ti, r, damon_nr_regions(t)); + trace_damon_aggregated_v2(ti, r, damon_nr_regions(t), + nr_probes); damon_warn_fix_nr_accesses_corruption(r); r->last_nr_accesses = r->nr_accesses; r->nr_accesses = 0; -- 2.47.3