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From: Mukesh Ojha <mojha@codeaurora.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org,
	Raghavendra Rao Ananta <rananta@codeaurora.org>,
	Ingo Molnar <mingo@redhat.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@redhat.com>, Alexei Starovoitov <ast@kernel.org>
Subject: Re: [PATCH V4] perf: event preserve and create across cpu hotplug
Date: Tue, 18 Jun 2019 19:10:13 +0530	[thread overview]
Message-ID: <cc01dc2b-8992-cd95-e181-3400fc1ce82f@codeaurora.org> (raw)
In-Reply-To: <20190618122329.GE3419@hirez.programming.kicks-ass.net>


On 6/18/2019 5:53 PM, Peter Zijlstra wrote:
> On Tue, Jun 18, 2019 at 02:24:51PM +0530, Mukesh Ojha wrote:
>> Perf framework doesn't allow preserving CPU events across
>> CPU hotplugs. The events are scheduled out as and when the
>> CPU walks offline. Moreover, the framework also doesn't
>> allow the clients to create events on an offline CPU. As
>> a result, the clients have to keep on monitoring the CPU
>> state until it comes back online.
>>
>> Therefore,
> That's not a therefore. There's a distinct lack of rationale here. Why
> do you want this?

Thanks Peter for coming back on this.

Missed to send the coverletter,
https://lkml.org/lkml/2019/5/31/438
Will resend this with coverletter.

Btw,  This patch

is based on suggestion given by you on this
https://lkml.org/lkml/2018/2/16/763


Thanks.
Mukesh


Thanks.
Mukesh


  reply	other threads:[~2019-06-18 13:40 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-31 13:39 [PATCH V2 0/1] perf: Add CPU hotplug support for events Mukesh Ojha
2019-05-31 13:39 ` [PATCH V2 1/1] perf: event preserve and create across cpu hotplug Mukesh Ojha
2019-06-03 17:53   ` Jiri Olsa
2019-06-04 14:09     ` Mukesh Ojha
2019-06-12 10:57   ` [PATCH V3] " Mukesh Ojha
2019-06-18  8:54     ` [PATCH V4] " Mukesh Ojha
2019-06-18 12:23       ` Peter Zijlstra
2019-06-18 13:40         ` Mukesh Ojha [this message]
2019-06-18 13:46       ` [PATCH RESEND V4 0/1] perf: Add CPU hotplug support for events Mukesh Ojha
2019-06-18 13:46         ` [PATCH RESEND V4 1/1] perf: event preserve and create across cpu hotplug Mukesh Ojha
2019-07-02  8:25           ` Mukesh Ojha
2019-06-24  9:01         ` [PATCH RESEND V4 0/1] perf: Add CPU hotplug support for events Mukesh Ojha
2019-07-26  9:06           ` Mukesh Ojha

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