From: Juergen Gross <jgross@suse.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>,
xen-devel@lists.xenproject.org
Cc: "Wei Liu" <wei.liu2@citrix.com>,
"Jan Beulich" <jbeulich@suse.com>,
"Roger Pau Monné" <roger.pau@citrix.com>
Subject: Re: [PATCH 4/6] xen: don't free percpu areas during suspend
Date: Wed, 27 Mar 2019 17:18:27 +0100 [thread overview]
Message-ID: <aac2efca-8024-485a-4b8f-8565341c305c@suse.com> (raw)
In-Reply-To: <e10c14cd-54ac-8d8c-2d5c-db4adbd39d07@citrix.com>
On 27/03/2019 16:55, Andrew Cooper wrote:
> On 18/03/2019 13:11, Juergen Gross wrote:
>> Instead of freeing percpu areas during suspend and allocating them
>> again when resuming keep them. Only free an area in case a cpu didn't
>> come up again when resuming.
>>
>> Signed-off-by: Juergen Gross <jgross@suse.com>
>
> Hmm - this is slightly problematic, given the dual nature of this code.
>
> I agree that it this change is beneficial for the suspend case, but it
> is a problem when we are parking an individual CPU for smt=0 or
> xen-hptool reasons.
>
> Do we have any hint we can use when taking the CPU down as to whether
> we're expecting it to come straight back up again?
Did you look into the patch? I did this by testing system_state.
Juergen
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next prev parent reply other threads:[~2019-03-27 16:18 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-18 13:11 [PATCH 0/6] xen: simplify suspend/resume handling Juergen Gross
2019-03-18 13:11 ` [PATCH 1/6] xen/sched: call cpu_disable_scheduler() via cpu notifier Juergen Gross
2019-03-27 15:34 ` Andrew Cooper
2019-03-27 15:35 ` George Dunlap
2019-03-27 16:22 ` Jan Beulich
2019-03-27 16:24 ` Dario Faggioli
2019-03-27 16:31 ` Juergen Gross
2019-03-27 16:51 ` Dario Faggioli
2019-03-27 16:53 ` Juergen Gross
[not found] ` <5C9BA336020000780022235B@suse.com>
2019-03-27 16:45 ` Juergen Gross
2019-03-27 16:58 ` Jan Beulich
2019-03-18 13:11 ` [PATCH 2/6] xen: add helper for calling notifier_call_chain() to common/cpu.c Juergen Gross
2019-03-25 11:56 ` Dario Faggioli
2019-03-27 12:25 ` George Dunlap
2019-03-27 15:39 ` Andrew Cooper
2019-03-27 16:05 ` Juergen Gross
2019-03-18 13:11 ` [PATCH 3/6] xen: add new cpu notifier action CPU_RESUME_FAILED Juergen Gross
2019-03-25 12:21 ` Dario Faggioli
2019-03-25 12:29 ` Juergen Gross
2019-03-27 15:54 ` Dario Faggioli
2019-03-27 15:49 ` George Dunlap
2019-03-27 16:29 ` Jan Beulich
[not found] ` <5C9BA5010200007800222375@suse.com>
2019-03-27 16:32 ` Juergen Gross
2019-03-18 13:11 ` [PATCH 4/6] xen: don't free percpu areas during suspend Juergen Gross
2019-03-25 18:14 ` Dario Faggioli
2019-03-27 15:55 ` Andrew Cooper
2019-03-27 16:18 ` Juergen Gross [this message]
2019-03-27 16:38 ` Jan Beulich
[not found] ` <5C9BA70E02000078002223A3@suse.com>
2019-03-27 16:52 ` Juergen Gross
2019-03-28 6:59 ` Juergen Gross
2019-03-28 8:03 ` Jan Beulich
2019-04-11 9:49 ` Jan Beulich
2019-04-11 9:49 ` [Xen-devel] " Jan Beulich
[not found] ` <5C9C7FD202000078002225AB@suse.com>
2019-03-28 8:35 ` Juergen Gross
2019-03-28 9:36 ` Jan Beulich
2019-03-28 7:46 ` Jan Beulich
[not found] ` <5C9C7BF1020000780022258F@suse.com>
2019-03-28 7:53 ` Juergen Gross
2019-03-28 8:04 ` Jan Beulich
2019-03-18 13:11 ` [PATCH 5/6] xen/cpupool: simplify suspend/resume handling Juergen Gross
2019-03-27 15:56 ` George Dunlap
2019-03-27 16:32 ` Dario Faggioli
2019-03-18 13:11 ` [PATCH 6/6] xen/sched: don't disable scheduler on cpus during suspend Juergen Gross
2019-03-27 23:10 ` Dario Faggioli
2019-03-28 5:41 ` Juergen Gross
-- strict thread matches above, loose matches on Subject: below --
2019-03-28 8:35 [PATCH 4/6] xen: don't free percpu areas " Juergen Gross
[not found] <20190318131155.29450*1*jgross@suse.com>
[not found] ` <20190318131155.29450*5*jgross@suse.com>
[not found] <20190318131155.29450****1****jgross@suse.com>
[not found] ` <20190318131155.29450****5****jgross@suse.com>
[not found] ` <e10c14cd****54ac****8d8c****2d5c****db4adbd39d07@citrix.com>
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