From: Oleg Nesterov <oleg@redhat.com>
To: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Cc: tglx@linutronix.de, peterz@infradead.org,
paulmck@linux.vnet.ibm.com, rusty@rustcorp.com.au,
mingo@kernel.org, akpm@linux-foundation.org, namhyung@kernel.org,
vincent.guittot@linaro.org, tj@kernel.org, sbw@mit.edu,
amit.kucheria@linaro.org, rostedt@goodmis.org, rjw@sisk.pl,
wangyun@linux.vnet.ibm.com, xiaoguangrong@linux.vnet.ibm.com,
nikunj@linux.vnet.ibm.com, linux-pm@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH v3 1/9] CPU hotplug: Provide APIs to prevent CPU offline from atomic context
Date: Sun, 9 Dec 2012 21:22:34 +0100 [thread overview]
Message-ID: <20121209202234.GA5793@redhat.com> (raw)
In-Reply-To: <50C4EB79.5050203@linux.vnet.ibm.com>
On 12/10, Srivatsa S. Bhat wrote:
>
> On 12/10/2012 12:44 AM, Oleg Nesterov wrote:
>
> > But yes, it is easy to blame somebody else's code ;) And I can't suggest
> > something better at least right now. If I understand correctly, we can not
> > use, say, synchronize_sched() in _cpu_down() path
>
> We can't sleep in that code.. so that's a no-go.
But we can?
Note that I meant _cpu_down(), not get_online_cpus_atomic() or take_cpu_down().
Oleg.
next prev parent reply other threads:[~2012-12-09 20:22 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-07 17:37 [RFC PATCH v3 0/9] CPU hotplug: stop_machine()-free CPU hotplug Srivatsa S. Bhat
2012-12-07 17:38 ` [RFC PATCH v3 1/9] CPU hotplug: Provide APIs to prevent CPU offline from atomic context Srivatsa S. Bhat
2012-12-07 17:57 ` Tejun Heo
2012-12-07 18:16 ` Tejun Heo
2012-12-07 18:33 ` Srivatsa S. Bhat
2012-12-07 18:24 ` Srivatsa S. Bhat
2012-12-07 18:31 ` Tejun Heo
2012-12-07 18:38 ` Srivatsa S. Bhat
2012-12-09 19:14 ` Oleg Nesterov
2012-12-09 19:50 ` Srivatsa S. Bhat
2012-12-09 20:22 ` Oleg Nesterov [this message]
2012-12-10 4:28 ` Srivatsa S. Bhat
2012-12-10 17:24 ` Oleg Nesterov
2012-12-11 13:13 ` Srivatsa S. Bhat
2012-12-11 13:47 ` Tejun Heo
2012-12-11 14:02 ` Srivatsa S. Bhat
2012-12-11 14:07 ` Tejun Heo
2012-12-11 16:28 ` Srivatsa S. Bhat
2012-12-09 21:13 ` Oleg Nesterov
2012-12-10 5:01 ` Srivatsa S. Bhat
2012-12-10 17:28 ` Oleg Nesterov
2012-12-11 13:05 ` Srivatsa S. Bhat
2012-12-09 20:57 ` Oleg Nesterov
2012-12-10 5:19 ` Srivatsa S. Bhat
2012-12-10 18:15 ` Oleg Nesterov
2012-12-11 13:04 ` Srivatsa S. Bhat
2012-12-07 17:38 ` [RFC PATCH v3 2/9] CPU hotplug: Convert preprocessor macros to static inline functions Srivatsa S. Bhat
2012-12-07 17:38 ` [RFC PATCH v3 3/9] smp, cpu hotplug: Fix smp_call_function_*() to prevent CPU offline properly Srivatsa S. Bhat
2012-12-07 17:39 ` [RFC PATCH v3 4/9] smp, cpu hotplug: Fix on_each_cpu_*() " Srivatsa S. Bhat
2012-12-07 17:39 ` [RFC PATCH v3 5/9] sched, cpu hotplug: Use stable online cpus in try_to_wake_up() & select_task_rq() Srivatsa S. Bhat
2012-12-07 17:39 ` [RFC PATCH v3 6/9] kick_process(), cpu-hotplug: Prevent offlining of target CPU properly Srivatsa S. Bhat
2012-12-07 17:39 ` [RFC PATCH v3 7/9] yield_to(), cpu-hotplug: Prevent offlining of other CPUs properly Srivatsa S. Bhat
2012-12-09 19:48 ` Oleg Nesterov
2012-12-09 19:57 ` Srivatsa S. Bhat
2012-12-09 20:40 ` Oleg Nesterov
2012-12-10 4:04 ` Srivatsa S. Bhat
2012-12-07 17:40 ` [RFC PATCH v3 8/9] kvm, vmx: Add atomic synchronization with CPU Hotplug Srivatsa S. Bhat
2012-12-07 17:40 ` [RFC PATCH v3 9/9] cpu: No more __stop_machine() in _cpu_down() Srivatsa S. Bhat
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20121209202234.GA5793@redhat.com \
--to=oleg@redhat.com \
--cc=akpm@linux-foundation.org \
--cc=amit.kucheria@linaro.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=namhyung@kernel.org \
--cc=nikunj@linux.vnet.ibm.com \
--cc=paulmck@linux.vnet.ibm.com \
--cc=peterz@infradead.org \
--cc=rjw@sisk.pl \
--cc=rostedt@goodmis.org \
--cc=rusty@rustcorp.com.au \
--cc=sbw@mit.edu \
--cc=srivatsa.bhat@linux.vnet.ibm.com \
--cc=tglx@linutronix.de \
--cc=tj@kernel.org \
--cc=vincent.guittot@linaro.org \
--cc=wangyun@linux.vnet.ibm.com \
--cc=xiaoguangrong@linux.vnet.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).