Re: [PATCH] perf/x86/intel: Avoid unnecessary reallocations of memory allocated in cpu hotplug prepare state

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To: zhe.he@xxxxxxxxxxxxx
Subject: Re: [PATCH] perf/x86/intel: Avoid unnecessary reallocations of memory allocated in cpu hotplug prepare state
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Tue, 18 Dec 2018 12:02:09 +0100
Cc: acme@xxxxxxxxxx, ak@xxxxxxxxxxxxxxx, alexander.shishkin@xxxxxxxxxxxxxxx, bp@xxxxxxxxx, hpa@xxxxxxxxx, jolsa@xxxxxxxxxx, jolsa@xxxxxxxxxx, kan.liang@xxxxxxxxxxxxxxx, mingo@xxxxxxxxxx, namhyung@xxxxxxxxxx, tglx@xxxxxxxxxxxxx, x86@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-rt-users@xxxxxxxxxxxxxxx
In-reply-to: <1545129033-21757-1-git-send-email-zhe.he@windriver.com>
References: <1545129033-21757-1-git-send-email-zhe.he@windriver.com>
User-agent: Mutt/1.10.1 (2018-07-13)

On Tue, Dec 18, 2018 at 06:30:33PM +0800, zhe.he@xxxxxxxxxxxxx wrote:
> Besides, in preempt-rt full mode, the freeing can happen in atomic context and
> thus cause the following BUG.

Hurm, I though we fixed all those long ago..

And no, the patch is horrible; that's what we have things like
x86_pmu::cpu_dead() for.

Follow-Ups:
- Re: [PATCH] perf/x86/intel: Avoid unnecessary reallocations of memory allocated in cpu hotplug prepare state
  - From: Thomas Gleixner
- Re: [PATCH] perf/x86/intel: Avoid unnecessary reallocations of memory allocated in cpu hotplug prepare state
  - From: Sebastian Andrzej Siewior

References:
- [PATCH] perf/x86/intel: Avoid unnecessary reallocations of memory allocated in cpu hotplug prepare state
  - From: zhe.he

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