linux-kernel - [PATCH v2 0/4] tools/rtla: Consolidate nr

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Message-ID: <20260209092436.2899888-1-costa.shul@redhat.com>
Date: Mon,  9 Feb 2026 11:24:32 +0200
From: Costa Shulyupin <costa.shul@...hat.com>
To: Steven Rostedt <rostedt@...dmis.org>,
	Tomas Glozar <tglozar@...hat.com>,
	Costa Shulyupin <costa.shul@...hat.com>,
	Crystal Wood <crwood@...hat.com>,
	Wander Lairson Costa <wander@...hat.com>,
	Ivan Pravdin <ipravdin.official@...il.com>,
	John Kacur <jkacur@...hat.com>,
	Tiezhu Yang <yangtiezhu@...ngson.cn>,
	linux-trace-kernel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	bpf@...r.kernel.org
Subject: [PATCH v2 0/4] tools/rtla: Consolidate nr_cpus usage

sysconf(_SC_NPROCESSORS_CONF) (via get_nprocs_conf) reflects
cpu_possible_mask, which is fixed at boot time, so querying it
repeatedly is unnecessary.

Replace multiple calls to sysconf(_SC_NPROCESSORS_CONF) with a single
global nr_cpus variable initialized once at startup.

v2:
- Add `#pragma once` in timerlat_u.h to avoid redefinition errors with
  pre-C23 compilers.

Costa Shulyupin (4):
  tools/rtla: Consolidate nr_cpus usage across all tools
  tools/rtla: Remove unneeded nr_cpus arguments
  tools/rtla: Remove unneeded nr_cpus members
  tools/rtla: Remove unneeded nr_cpus from for_each_monitored_cpu

 tools/tracing/rtla/src/common.c        |  7 ++-
 tools/tracing/rtla/src/common.h        |  4 +-
 tools/tracing/rtla/src/osnoise_hist.c  | 26 +++++------
 tools/tracing/rtla/src/osnoise_top.c   | 16 ++-----
 tools/tracing/rtla/src/timerlat.c      |  9 ++--
 tools/tracing/rtla/src/timerlat_aa.c   | 11 ++---
 tools/tracing/rtla/src/timerlat_bpf.c  |  5 +--
 tools/tracing/rtla/src/timerlat_bpf.h  |  6 +--
 tools/tracing/rtla/src/timerlat_hist.c | 62 +++++++++++---------------
 tools/tracing/rtla/src/timerlat_top.c  | 47 +++++++------------
 tools/tracing/rtla/src/timerlat_u.c    |  9 ++--
 tools/tracing/rtla/src/timerlat_u.h    |  1 +
 tools/tracing/rtla/src/utils.c         | 10 +----
 13 files changed, 80 insertions(+), 133 deletions(-)

-- 
2.52.0