From: Costa Shulyupin <costa.shul@redhat.com>
To: Steven Rostedt <rostedt@goodmis.org>,
Tomas Glozar <tglozar@redhat.com>,
Costa Shulyupin <costa.shul@redhat.com>,
Crystal Wood <crwood@redhat.com>,
Wander Lairson Costa <wander@redhat.com>,
John Kacur <jkacur@redhat.com>,
Ivan Pravdin <ipravdin.official@gmail.com>,
Tiezhu Yang <yangtiezhu@loongson.cn>,
linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org,
bpf@vger.kernel.org
Subject: [PATCH v4 0/4] tools/rtla: Consolidate nr_cpus usage
Date: Fri, 6 Mar 2026 21:49:48 +0200 [thread overview]
Message-ID: <20260306194953.2511960-1-costa.shul@redhat.com> (raw)
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.
v4:
- Reorder change of BPF functions
- Update unit test
v3:
- Remove unneeded cpus parameter from timerlat BPF functions as
requested by Wander Costa.
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 | 19 +++----
tools/tracing/rtla/src/timerlat_bpf.h | 12 ++---
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 +---
tools/tracing/rtla/tests/unit/unit_tests.c | 44 +++++++--------
14 files changed, 108 insertions(+), 169 deletions(-)
--
2.53.0
next reply other threads:[~2026-03-06 19:51 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-06 19:49 Costa Shulyupin [this message]
2026-03-06 19:49 ` [PATCH v4 1/4] tools/rtla: Consolidate nr_cpus usage across all tools Costa Shulyupin
2026-03-06 19:49 ` [PATCH v4 2/4] tools/rtla: Remove unneeded nr_cpus arguments Costa Shulyupin
2026-03-06 19:49 ` [PATCH v4 3/4] tools/rtla: Remove unneeded nr_cpus members Costa Shulyupin
2026-03-06 19:49 ` [PATCH v4 4/4] tools/rtla: Remove unneeded nr_cpus from for_each_monitored_cpu Costa Shulyupin
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