linux-kernel - Re: [PATCH v2 1/2] perf bench futex: Use a 64-bit time

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Date:   Wed, 20 Oct 2021 11:56:12 +1000
From:   Alistair Francis <alistair23@...il.com>
To:     André Almeida <andrealmeid@...labora.com>
Cc:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Alistair Francis <alistair.francis@...nsource.wdc.com>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        linux-perf-users@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Mark Rutland <mark.rutland@....com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Darren Hart <dvhart@...radead.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Atish Patra <atish.patra@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Alistair Francis <alistair.francis@....com>
Subject: Re: [PATCH v2 1/2] perf bench futex: Use a 64-bit time_t

On Wed, Oct 20, 2021 at 10:01 AM André Almeida
<andrealmeid@...labora.com> wrote:
>
> Às 20:17 de 19/10/21, Alistair Francis escreveu:
> > On Wed, Oct 20, 2021 at 2:56 AM Arnaldo Carvalho de Melo
> > <arnaldo.melo@...il.com> wrote:
> >>
> >> Em Fri, Oct 15, 2021 at 10:56:33AM +1000, Alistair Francis escreveu:
> >>> From: Alistair Francis <alistair.francis@....com>
> >>>
> >>> Convert tools/perf to only use a 64-bit time_t. On 64-bit architectures
> >>> this isn't a functional change. On 32-bit architectures we now only
> >>> perform 64-bit time_t syscalls (__NR_futex_time64) and use a struct
> >>> timespec64.
> >>>
> >>> This won't work on kernels before 5.1, but as perf is tied to the kernel
> >>> that's ok.
> >>
> >> No, perf is not tied to the kernel, one can use a new perf tool on any
> >> previous kernel, and an old perf tool should work on new kernels as
> >> well.
> >
> > + André, I won't be doing this the way you requested
> >
>
> Ok, thanks anyway for your work and sorry for the trouble :)

No worries!

Alistair