From: Peter Zijlstra <peterz@infradead.org>
To: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Cc: Vadim Fedorenko <vadfed@meta.com>, Borislav Petkov <bp@alien8.de>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Eduard Zingerman <eddyz87@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
Yonghong Song <yonghong.song@linux.dev>,
Mykola Lysenko <mykolal@fb.com>,
x86@kernel.org, bpf@vger.kernel.org,
Martin KaFai Lau <martin.lau@linux.dev>
Subject: Re: [PATCH bpf-next v8 1/4] bpf: add bpf_get_cpu_time_counter kfunc
Date: Thu, 21 Nov 2024 16:33:34 +0100 [thread overview]
Message-ID: <20241121153334.GN39245@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <482d32d5-2caa-4759-b3b1-765678ac42a2@linux.dev>
On Thu, Nov 21, 2024 at 06:35:39AM -0800, Vadim Fedorenko wrote:
> On 21/11/2024 03:32, Peter Zijlstra wrote:
> > On Wed, Nov 20, 2024 at 04:08:11PM -0800, Vadim Fedorenko wrote:
> > > New kfunc to return ARCH-specific timecounter. For x86 BPF JIT converts
> > > it into rdtsc ordered call. Other architectures will get JIT
> > > implementation too if supported. The fallback is to
> > > __arch_get_hw_counter().
> >
> > Still not a single word as to *WHY* and what you're going to do with
> > those values.
> >
> > NAK
>
> Did you have a chance to read cover letter?
Cover letter is disposable and not retained when applying patches, as
such I rarely read it.
next prev parent reply other threads:[~2024-11-21 15:33 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-11-21 0:08 [PATCH bpf-next v8 0/4] bpf: add cpu cycles kfuncss Vadim Fedorenko
2024-11-21 0:08 ` [PATCH bpf-next v8 1/4] bpf: add bpf_get_cpu_time_counter kfunc Vadim Fedorenko
2024-11-21 11:32 ` Peter Zijlstra
2024-11-21 14:35 ` Vadim Fedorenko
2024-11-21 15:33 ` Peter Zijlstra [this message]
2024-11-21 23:51 ` Andrii Nakryiko
2024-11-21 23:55 ` Vadim Fedorenko
2024-11-21 0:08 ` [PATCH bpf-next v8 2/4] bpf: add bpf_cpu_time_counter_to_ns helper Vadim Fedorenko
2024-11-21 11:31 ` Peter Zijlstra
2024-11-21 0:08 ` [PATCH bpf-next v8 3/4] selftests/bpf: add selftest to check rdtsc jit Vadim Fedorenko
2024-11-21 0:08 ` [PATCH bpf-next v8 4/4] selftests/bpf: add usage example for cpu cycles kfuncs Vadim Fedorenko
2024-11-22 11:34 ` [PATCH bpf-next v8 0/4] bpf: add cpu cycles kfuncss Peter Zijlstra
2024-11-22 15:40 ` Vadim Fedorenko
2024-11-26 18:12 ` Andrii Nakryiko
2024-11-28 11:27 ` Peter Zijlstra
2024-11-28 11:33 ` Peter Zijlstra
2024-11-28 14:30 ` Vadim Fedorenko
2024-11-28 14:28 ` Vadim Fedorenko
2024-12-02 19:15 ` Andrii Nakryiko
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