linux-kernel - Re: [RFC PATCH 3/8] perf: Init/fini PMU specific data

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Message-ID: <79138ea7-2249-b7e0-3541-8569e593c6e8@linux.intel.com>
Date:   Mon, 2 Dec 2019 19:38:00 +0300
From:   Alexey Budankov <alexey.budankov@...ux.intel.com>
To:     Andi Kleen <ak@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     kan.liang@...ux.intel.com, mingo@...hat.com, acme@...nel.org,
        tglx@...utronix.de, bp@...en8.de, linux-kernel@...r.kernel.org,
        eranian@...gle.com, vitaly.slobodskoy@...el.com
Subject: Re: [RFC PATCH 3/8] perf: Init/fini PMU specific data


On 02.12.2019 17:59, Andi Kleen wrote:
>>
>> This is atricous crap. Also it is completely broken for -RT.
> 
> Well can you please suggest how you would implement it instead?

FWIW,
An alternative could probably be to make task_ctx_data allocations
on the nearest context switch in, and obvious drawback is slowdown on
this critical path, but it could be amortized by static branches.

Thanks,
Alexey