linux-kernel - Re: [RFC][PATCH] perf: Rewrite core context handling

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Message-ID: <871s8o62if.fsf@ashishki-desk.ger.corp.intel.com>
Date:   Wed, 17 Oct 2018 18:01:28 +0300
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>, mingo@...nel.org
Cc:     linux-kernel@...r.kernel.org, acme@...nel.org, jolsa@...hat.com,
        songliubraving@...com, eranian@...gle.com, tglx@...utronix.de,
        mark.rutland@....com, megha.dey@...el.com, frederic@...nel.org
Subject: Re: [RFC][PATCH] perf: Rewrite core context handling

Alexey Budankov <alexey.budankov@...ux.intel.com> writes:

> Since it reduces to single cpu context (and single task context) at all times, 
> ideally, it would probably be coded as simple as this: 
>
> 	perf_rotate_context()
> 	{
>             cpu = this_cpu_ptr(&cpu_context)
>             for_every_pmu(pmu, cpu)
>                     for_every_event_ctx(event_ctx, pmu)
> 	                    rotate(event_ctx, pmu)
> 	}
>
> so rotate(event_ctx, pmu) would operate on common events objects semantics 
> and memory layout, and PMU specific code handle SW/HW programming differences.

Ok, what's event_ctx and how does that simplify things?

Regards,
--
Alex