Re: [PATCH v3 0/5] tools/rtla: Consolidate nr_cpus usage

[Wander Lairson Costa <wander@redhat.com>]

On Fri, Feb 13, 2026 at 01:52:29PM +0200, Costa Shulyupin wrote:
> 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.


Reviewed-by: Wander Lairson Costa <wander@redhat.com>

> 
> 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 (5):
>   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/rtla: Remove unneeded cpus parameter from timerlat BPF functions
> 
>  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 +----
>  13 files changed, 88 insertions(+), 145 deletions(-)
> 
> -- 
> 2.52.0
>