From: Andrii Anisov <andrii.anisov@gmail.com>
To: Julien Grall <julien.grall@arm.com>, xen-devel@lists.xenproject.org
Cc: Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>,
Stefano Stabellini <sstabellini@kernel.org>,
Andrii Anisov <andrii_anisov@epam.com>
Subject: Re: [Xen-devel] [RFC 1/6] xen/arm: Re-enable interrupt later in the trap path
Date: Tue, 30 Jul 2019 20:35:10 +0300 [thread overview]
Message-ID: <de4feda4-d8b6-4922-26f5-ea3d3f940563@gmail.com> (raw)
In-Reply-To: <ad2a343e-1a65-6569-17a2-e5b676908e49@arm.com>
On 26.07.19 13:48, Julien Grall wrote:
> This is the 3rd time you send this patch... and still no proper explanation why this is done nor the impact on keeping the interrupts disabled longer than necessary.
I know it is the third time for this patch. Yet it is in the RFC series again.
In this series I think I need interrupts locked until I start time accounting for hypervisor. Time accounting is started by `tacc_head()` function. I prefer to have it called from C, because it is more convenient and obvious for those who are less familiar with the ARM code.
> Resending the patch without things addressed is only going to make it worst.
I'm still convinced the patch would improve interrupt latency for high interrupt rate use cases.
But I understand that I have no experiment to prove the effect, so I'm not willing to push through the patch.
Also, I have a question to you about another aspect of this patch. In the function `enter_hypervisor_head()` there is a check for a disabled workaround and turning it on. If we have the interrupts enabled until there, we have good chances to go through the interrupt processing `do_IRQ()` before WA enabled. Is it still OK?
--
Sincerely,
Andrii Anisov.
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next prev parent reply other threads:[~2019-07-30 17:35 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-26 10:37 [Xen-devel] [RFC 0/6] XEN scheduling hardening Andrii Anisov
2019-07-26 10:37 ` [Xen-devel] [RFC 1/6] xen/arm: Re-enable interrupt later in the trap path Andrii Anisov
2019-07-26 10:48 ` Julien Grall
2019-07-30 17:35 ` Andrii Anisov [this message]
2019-07-30 20:10 ` Julien Grall
2019-08-01 6:45 ` Andrii Anisov
2019-08-01 9:37 ` Julien Grall
2019-08-02 8:28 ` Andrii Anisov
2019-08-02 9:03 ` Julien Grall
2019-08-02 12:24 ` Andrii Anisov
2019-08-02 13:22 ` Julien Grall
2019-08-01 11:19 ` Dario Faggioli
2019-08-02 7:50 ` Andrii Anisov
2019-08-02 9:15 ` Julien Grall
2019-08-02 13:07 ` Andrii Anisov
2019-08-02 13:49 ` Julien Grall
2019-08-03 1:39 ` Dario Faggioli
2019-08-03 0:55 ` Dario Faggioli
2019-08-06 13:09 ` Andrii Anisov
2019-08-08 14:07 ` Andrii Anisov
2019-08-13 14:45 ` Dario Faggioli
2019-08-15 18:25 ` Andrii Anisov
2019-07-26 10:37 ` [Xen-devel] [RFC 2/6] schedule: account true system idle time Andrii Anisov
2019-07-26 12:00 ` Dario Faggioli
2019-07-26 12:42 ` Andrii Anisov
2019-07-29 11:40 ` Dario Faggioli
2019-08-01 8:23 ` Andrii Anisov
2019-07-26 10:37 ` [Xen-devel] [RFC 3/6] sysctl: extend XEN_SYSCTL_getcpuinfo interface Andrii Anisov
2019-07-26 12:15 ` Dario Faggioli
2019-07-26 13:06 ` Andrii Anisov
2019-07-26 10:37 ` [Xen-devel] [RFC 4/6] xentop: show CPU load information Andrii Anisov
2019-07-26 10:37 ` [Xen-devel] [RFC 5/6] arm64: сall enter_hypervisor_head only when it is needed Andrii Anisov
2019-07-26 10:44 ` Andrii Anisov
2019-07-26 10:37 ` [Xen-devel] [RFC 5/6] arm64: call " Andrii Anisov
2019-07-26 10:59 ` Julien Grall
2019-07-30 17:35 ` Andrii Anisov
2019-07-31 11:02 ` Julien Grall
2019-07-31 11:33 ` Andre Przywara
2019-08-01 7:33 ` Andrii Anisov
2019-08-01 10:17 ` Julien Grall
2019-08-02 13:50 ` Andrii Anisov
2019-07-26 10:37 ` [Xen-devel] [RFC 6/6] schedule: account all the hypervisor time to the idle vcpu Andrii Anisov
2019-07-26 11:56 ` [Xen-devel] [RFC 0/6] XEN scheduling hardening Dario Faggioli
2019-07-26 12:14 ` Juergen Gross
2019-07-29 11:53 ` Dario Faggioli
2019-07-29 12:13 ` Juergen Gross
2019-07-29 14:47 ` Andrii Anisov
2019-07-29 18:46 ` Dario Faggioli
2019-07-29 14:28 ` Andrii Anisov
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