linux-kernel - [PATCH v1 1/8] perf: Increase MAX_NR

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Message-Id: <20241206044035.1062032-2-irogers@google.com>
Date: Thu,  5 Dec 2024 20:40:28 -0800
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, James Clark <james.clark@...aro.org>, 
	Kyle Meyer <kyle.meyer@....com>, Ben Gainey <ben.gainey@....com>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1 1/8] perf: Increase MAX_NR_CPUS to 4096

From: Kyle Meyer <kyle.meyer@....com>

Systems have surpassed 2048 CPUs. Increase MAX_NR_CPUS to 4096.

Bitmaps declared with MAX_NR_CPUS bits will increase from 256B to 512B,
cpus_runtime will increase from 81960B to 163880B, and max_entries will
increase from 8192B to 16384B.

Signed-off-by: Kyle Meyer <kyle.meyer@....com>
Reviewed-by: Ian Rogers <irogers@...gle.com>
---
 tools/lib/perf/include/internal/cpumap.h | 2 +-
 tools/perf/perf.h                        | 2 +-
 tools/perf/util/bpf_skel/kwork_top.bpf.c | 4 +++-
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/tools/lib/perf/include/internal/cpumap.h b/tools/lib/perf/include/internal/cpumap.h
index 49649eb51ce4..3cf28522004e 100644
--- a/tools/lib/perf/include/internal/cpumap.h
+++ b/tools/lib/perf/include/internal/cpumap.h
@@ -22,7 +22,7 @@ DECLARE_RC_STRUCT(perf_cpu_map) {
 };
 
 #ifndef MAX_NR_CPUS
-#define MAX_NR_CPUS	2048
+#define MAX_NR_CPUS	4096
 #endif
 
 struct perf_cpu_map *perf_cpu_map__alloc(int nr_cpus);
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index c004dd4e65a3..3cb40965549f 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -3,7 +3,7 @@
 #define _PERF_PERF_H
 
 #ifndef MAX_NR_CPUS
-#define MAX_NR_CPUS			2048
+#define MAX_NR_CPUS			4096
 #endif
 
 enum perf_affinity {
diff --git a/tools/perf/util/bpf_skel/kwork_top.bpf.c b/tools/perf/util/bpf_skel/kwork_top.bpf.c
index 594da91965a2..73e32e063030 100644
--- a/tools/perf/util/bpf_skel/kwork_top.bpf.c
+++ b/tools/perf/util/bpf_skel/kwork_top.bpf.c
@@ -18,7 +18,9 @@ enum kwork_class_type {
 };
 
 #define MAX_ENTRIES     102400
-#define MAX_NR_CPUS     2048
+#ifndef MAX_NR_CPUS
+#define MAX_NR_CPUS     4096
+#endif
 #define PF_KTHREAD      0x00200000
 #define MAX_COMMAND_LEN 16
 
-- 
2.47.0.338.g60cca15819-goog