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Message-ID: <ZyMmD1SdqpIg8Wox@google.com>
Date: Wed, 30 Oct 2024 23:39:11 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Alexandre Ghiti <alex@...ti.fr>
Cc: Björn Töpel <bjorn@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
"Liang, Kan" <kan.liang@...ux.intel.com>,
linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
linux-riscv@...ts.infradead.org,
Björn Töpel <bjorn@...osinc.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>, Anup Patel <anup@...infault.org>,
Atish Patra <atishp@...osinc.com>
Subject: Re: [PATCH] perf, riscv: Wire up perf trace support for RISC-V
Hello,
On Wed, Oct 30, 2024 at 08:31:35AM +0100, Alexandre Ghiti wrote:
> Hi Bjorn, Namhyung,
>
> On 30/10/2024 01:37, Namhyung Kim wrote:
> > Hello,
> >
> > On Thu, Oct 24, 2024 at 12:03:51PM -0700, Björn Töpel wrote:
> > > From: Björn Töpel <bjorn@...osinc.com>
> > >
> > > RISC-V does not currently support perf trace, since the system call
> > > table is not generated.
> > >
> > > Perform the copy/paste exercise, wiring up RISC-V system call table
> > > generation.
> > Can anybody with RISC-V please test this?
>
>
> So before this patch, I get:
>
> Error::5File /sys/kernel/tracing//events/raw_syscalls/sys_(enter|exit) not
> found.
> Hint: Perhaps this kernel misses some CONFIG_ setting to enable this
> feature?.
>
> After applying this patch, I get a proper trace:
> ....
>
> 7.435 ( 0.332 ms): ls/1307 openat(dfd: CWD, filename: 0xb36ef668,
> flags: RDONLY|CLOEXEC) = 3
> 8.023 ( 0.454 ms): ls/1307 mmap(len: 23171, prot: READ, flags: PRIVATE,
> fd: 3) = 0x7fffb36cd000
> 8.558 ( 0.065 ms): ls/1307 close(fd:
> 3) = 0
> 8.850 ( 0.294 ms): ls/1307 openat(dfd: CWD, filename: 0xb36f9f80,
> flags: RDONLY|CLOEXEC) = 3
> 9.223 ( 0.152 ms): ls/1307 read(fd: 3, buf: 0x7fffe27b3c20, count: 832)
>
> ...
>
> So you can add:
>
> Tested-by: Alexandre Ghiti <alexghiti@...osinc.com>
Thanks for your test!
Namhyung
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