linux-kernel - Re: [PATCH] rtla: Define _GNU_SOURCE in timerlat

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Message-ID: <CAP4=nvR80FQydq+4PWpD80KZfHbS43jnV72Q-brhnK22G+Dt9Q@mail.gmail.com>
Date: Tue, 27 May 2025 09:01:26 +0200
From: Tomas Glozar <tglozar@...hat.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	John Kacur <jkacur@...hat.com>, Luis Goncalves <lgoncalv@...hat.com>
Subject: Re: [PATCH] rtla: Define _GNU_SOURCE in timerlat_bpf.c

st 30. 4. 2025 v 16:47 odesílatel Tomas Glozar <tglozar@...hat.com> napsal:
>
> Because of the shift, timerlat_bpf_init incorrectly reads
> params->entries as 0 for timerlat-hist and disables the creation of
> histogram maps, causing breakage in BPF sample collection mode:
>
> $ rtla timerlat hist -d 1s
> Error pulling BPF data

Linux 6.15 was released with broken rtla on systems with latest glibc
due to this patch not being merged:

$ rtla --version
rtla version 6.15.0
...
$ rtla timerlat hist -d 1s
Error pulling BPF data

Please have a look at this as soon as possible, so the fix can get
into 6.16 and stable.

Thanks,
Tomas