linux-kernel - Re: [PATCH v3 1/3] perf: Add PERF_EVENT_IOC_INC_EVENT

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Message-ID: <20250113131812.GB8362@noisy.programming.kicks-ass.net>
Date: Mon, 13 Jan 2025 14:18:12 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Charlie Jenkins <charlie@...osinc.com>
Cc: Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...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>,
	Atish Patra <atishp@...osinc.com>, linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/3] perf: Add PERF_EVENT_IOC_INC_EVENT_LIMIT

On Mon, Jan 06, 2025 at 08:07:32PM -0800, Charlie Jenkins wrote:
> PERF_EVENT_IOC_REFRESH immediately enables after incrementing
> event_limit.  Provide a new ioctl flag that allows programs to increment
> event_limit without enabling the event. A usecase for this is to set an
> event_limit in combination with enable_on_exec.


Utter lack of WHY.