From: Andi Kleen <ak@linux.intel.com>
To: John Stultz <jstultz@google.com>,
"Liang, Kan" <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
mingo@redhat.com, linux-kernel@vger.kernel.org, sboyd@kernel.org,
eranian@google.com, namhyung@kernel.org, adrian.hunter@intel.com
Subject: Re: [RFC PATCH V2 2/9] perf: Extend ABI to support post-processing monotonic raw conversion
Date: Sun, 12 Mar 2023 13:50:15 -0700 [thread overview]
Message-ID: <4971d93b-6d06-5734-d1ed-8c09501e22e2@linux.intel.com> (raw)
In-Reply-To: <CANDhNCoj6SseKe=7La9YqRzvBdhO5zetfDKzOqpue4J0MtyVaA@mail.gmail.com>
ersion. So the kernel internal mul/shift information has to be exposed.
> Ugh. Well, I think perf may have made a bad API choice here, so I'm
> still going to push back on exposting timekeeping internals to
> userland.
It's not about the perf ABI.
The perf mmap mult/offset if for PT, which always has raw TSCs.
Without it the PT decoder couldn't supply wall clock time.
-Andi
next prev parent reply other threads:[~2023-03-12 20:50 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-13 19:07 [RFC PATCH V2 0/9] Convert TSC to monotonic raw clock for PEBS kan.liang
2023-02-13 19:07 ` [RFC PATCH V2 1/9] timekeeping: Expose the conversion information of monotonic raw kan.liang
2023-02-13 19:28 ` John Stultz
2023-02-13 19:07 ` [RFC PATCH V2 2/9] perf: Extend ABI to support post-processing monotonic raw conversion kan.liang
2023-02-13 19:37 ` John Stultz
2023-02-13 21:40 ` Liang, Kan
2023-02-13 22:22 ` John Stultz
2023-02-14 10:43 ` Peter Zijlstra
2023-02-14 17:46 ` Liang, Kan
2023-02-14 19:37 ` John Stultz
2023-02-14 20:09 ` Liang, Kan
2023-02-14 20:21 ` John Stultz
2023-03-12 20:50 ` Andi Kleen [this message]
2023-02-14 19:34 ` John Stultz
2023-02-14 14:51 ` Liang, Kan
2023-02-14 17:00 ` Liang, Kan
2023-02-14 20:11 ` John Stultz
2023-02-14 20:38 ` Liang, Kan
2023-02-17 23:11 ` John Stultz
2023-03-08 18:44 ` Liang, Kan
2023-03-09 1:17 ` John Stultz
2023-03-09 16:56 ` Liang, Kan
2023-03-11 5:55 ` John Stultz
2023-03-13 21:19 ` Liang, Kan
2023-03-18 6:02 ` John Stultz
2023-03-21 15:26 ` Liang, Kan
2023-02-14 19:52 ` John Stultz
2023-02-13 19:07 ` [RFC PATCH V2 3/9] perf/x86: Factor out x86_pmu_sample_preload() kan.liang
2023-02-13 19:07 ` [RFC PATCH V2 4/9] perf/x86: Enable post-processing monotonic raw conversion kan.liang
2023-02-14 20:02 ` Thomas Gleixner
2023-02-14 20:21 ` Liang, Kan
2023-02-14 20:55 ` Thomas Gleixner
2023-03-21 15:38 ` Liang, Kan
2023-02-13 19:07 ` [RFC PATCH V2 5/9] perf/x86/intel: Enable large PEBS for monotonic raw kan.liang
2023-02-13 19:07 ` [RFC PATCH V2 6/9] tools headers UAPI: Sync linux/perf_event.h with the kernel sources kan.liang
2023-02-13 19:07 ` [RFC PATCH V2 7/9] perf session: Support the monotonic raw clock conversion information kan.liang
2023-02-13 19:07 ` [RFC PATCH V2 8/9] perf evsel, tsc: Support the monotonic raw clock conversion kan.liang
2023-02-13 19:07 ` [RFC PATCH V2 9/9] perf evsel: Enable post-processing monotonic raw conversion by default kan.liang
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