linux-kernel - [PATCH] perf: Increase MAX_NR

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Message-Id: <20241205165118.153148-1-kyle.meyer@hpe.com>
Date: Thu,  5 Dec 2024 10:51:18 -0600
From: Kyle Meyer <kyle.meyer@....com>
To: peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        namhyung@...nel.org, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        irogers@...gle.com, adrian.hunter@...el.com, kan.liang@...ux.intel.com,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Kyle Meyer <kyle.meyer@....com>
Subject: [PATCH] perf: Increase MAX_NR_CPUS to 4096

Systems have surpassed 2048 CPUs. Increase MAX_NR_CPUS to 4096.

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

Signed-off-by: Kyle Meyer <kyle.meyer@....com>
---

Tested on a 32 socket Sapphire Rapids system with 3840 CPUs.

 tools/lib/perf/include/internal/cpumap.h | 2 +-
 tools/perf/perf.h                        | 2 +-
 2 files changed, 2 insertions(+), 2 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 {
-- 
2.47.1