linux-kernel - Re: [PATCH/RFT] Re: [PATCH v5 1/8] perf trace: Fix iteration of syscall ids in syscalltbl->entries

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Message-ID: <ZxLglVIivPk05c97@x1>
Date: Fri, 18 Oct 2024 19:26:29 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Jiri Slaby <jirislaby@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>, Howard Chu <howardchu95@...il.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Ian Rogers <irogers@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
	Kan Liang <kan.liang@...el.com>, linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org, Song Liu <songliubraving@...com>,
	Yonghong Song <yhs@...com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH/RFT] Re: [PATCH v5 1/8] perf trace: Fix iteration of
 syscall ids in syscalltbl->entries

On Fri, Oct 18, 2024 at 07:16:49PM -0300, Arnaldo Carvalho de Melo wrote:
> On Mon, Oct 14, 2024 at 02:19:58PM +0200, Jiri Slaby wrote:
> > On 10. 10. 24, 23:02, Arnaldo Carvalho de Melo wrote:
> > > On Thu, Oct 10, 2024 at 09:31:54AM -0700, Namhyung Kim wrote:
> > > > On Thu, Oct 10, 2024 at 09:29:01AM -0700, Namhyung Kim wrote:
> > > > > On Thu, Oct 10, 2024 at 10:22:12AM +0200, Jiri Slaby wrote:
> > > > > > Subject: [PATCH] perf: fix non-listed archs
> 
> > > > > > Suggested-by: Howard Chu <howardchu95@...il.com>
> > > > > > Signed-off-by: Jiri Slaby <jslaby@...e.cz>
> 
> > > > > Acked-by: Namhyung Kim <namhyung@...nel.org>
> > > > Also with,
> > > > Fixes: 7a2fb5619cc1fb53 ("perf trace: Fix iteration of syscall ids in syscalltbl->entries")
> > > > > Arnaldo, can you please pick this up for v6.12?
> 
> > > Sure, probably the safest bet now, but just in case, Jiri, can you test
> > > the following?
> 
> > > From: Arnaldo Carvalho de Melo <acme@...hat.com>
> > > Subject: [PATCH 1/1] perf tools arm: Generate syscalltbl.c from arm's syscall.tbl
> > 
> > With this:
> > +++ b/tools/perf/Makefile.config
> > @@ -31,7 +31,7 @@ $(call detected_var,SRCARCH)
> >  ifneq ($(NO_SYSCALL_TABLE),1)
> 
> So after merging your changes (thanks) and finding an arm 32-bit system
> (ressurecting a raspberry pi 3), I can build it, with bpf skels, etc but
> then...

But if I uninstall clang and build without BPF skels, i.e. no BPF based
'perf trace' collection of syscall pointer args, I stumble in some other
problem on this debian (raspbian) system:

root@...arius:~# ls -la /sys/kernel/debug/tracing/events/syscalls
ls: cannot access '/sys/kernel/debug/tracing/events/syscalls': No such file or directory
root@...arius:~# 

Unsure where to find the config used to build this kernel:

root@...arius:~# uname -a
Linux aquarius 5.10.103-v7+ #1529 SMP Tue Mar 8 12:21:37 GMT 2022 armv7l GNU/Linux
root@...arius:~#

normally is in /boot/ but I'm no debian user, ideas?

But at least it builds, would that be enough? I don't think so, I'd like
to see this working...

- Arnaldo