From: Steven Rostedt <rostedt@goodmis.org>
To: peterz@infradead.org
Cc: Prasad Sodagudi <psodagud@codeaurora.org>,
tglx@linutronix.de, qais.yousef@arm.com, mingo@kernel.org,
cai@lca.pw, tyhicks@canonical.com, arnd@arndb.de,
rameezmustafa@codeaurora.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/2] measure latency of cpu hotplug path
Date: Thu, 24 Sep 2020 10:58:23 -0400 [thread overview]
Message-ID: <20200924105823.0e11f2e4@oasis.local.home> (raw)
In-Reply-To: <20200924083414.GB1362448@hirez.programming.kicks-ass.net>
On Thu, 24 Sep 2020 10:34:14 +0200
peterz@infradead.org wrote:
> On Wed, Sep 23, 2020 at 04:37:44PM -0700, Prasad Sodagudi wrote:
> > There are all changes related to cpu hotplug path and would like to seek
> > upstream review. These are all patches in Qualcomm downstream kernel
> > for a quite long time. First patch sets the rt prioity to hotplug
> > task and second patch adds cpuhp trace events.
> >
> > 1) cpu-hotplug: Always use real time scheduling when hotplugging a CPU
> > 2) cpu/hotplug: Add cpuhp_latency trace event
>
> Why? Hotplug is a known super slow path. If you care about hotplug
> latency you're doing it wrong.
I'd like to know the answer to Peter's question too. Why?
-- Steve
next prev parent reply other threads:[~2020-09-24 14:58 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-23 23:37 [PATCH 0/2] measure latency of cpu hotplug path Prasad Sodagudi
2020-09-23 23:37 ` [PATCH 1/2] cpu/hotplug: Add cpuhp_latency trace event Prasad Sodagudi
2020-09-28 14:58 ` Thomas Gleixner
2020-09-23 23:37 ` [PATCH 2/2] cpu-hotplug: Always use real time scheduling when hotplugging a CPU Prasad Sodagudi
2020-09-24 8:34 ` [PATCH 0/2] measure latency of cpu hotplug path peterz
2020-09-24 14:58 ` Steven Rostedt [this message]
2020-09-28 2:41 ` psodagud
2020-09-28 7:40 ` Peter Zijlstra
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