From: "Michal Koutný" <mkoutny@suse.com>
To: Vipin Sharma <vipinsh@google.com>
Cc: Tejun Heo <tj@kernel.org>,
rdunlap@infradead.org, thomas.lendacky@amd.com,
brijesh.singh@amd.com, jon.grimm@amd.com,
eric.vantassell@amd.com, pbonzini@redhat.com, hannes@cmpxchg.org,
frankja@linux.ibm.com, borntraeger@de.ibm.com, corbet@lwn.net,
seanjc@google.com, vkuznets@redhat.com, wanpengli@tencent.com,
jmattson@google.com, joro@8bytes.org, tglx@linutronix.de,
mingo@redhat.com, bp@alien8.de, hpa@zytor.com,
gingell@google.com, rientjes@google.com, dionnaglaze@google.com,
kvm@vger.kernel.org, x86@kernel.org, cgroups@vger.kernel.org,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [Patch v3 0/2] cgroup: New misc cgroup controller
Date: Mon, 15 Mar 2021 20:10:09 +0100 [thread overview]
Message-ID: <YE+xEbwUoRj+snTY@blackbook> (raw)
In-Reply-To: <YEupplaAWU1i0G6B@google.com>
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On Fri, Mar 12, 2021 at 09:49:26AM -0800, Vipin Sharma <vipinsh@google.com> wrote:
> I will add some more information in the cover letter of the next version.
Thanks.
> Each one coming up with their own interaction is a duplicate effort
> when they all need similar thing.
Could this be expressed as a new BPF hook (when allocating/freeing such
a resource unit)?
The decision could be made based on the configured limit or even some
other predicate.
(I saw this proposed already but I haven't seen some more reasoning
whether it's worse/better. IMO, BPF hooks are "cheaper" than full-blown
controllers, though it's still new user API.)
> As per my understanding this is the only for way for loadable modules
> (kvm-amd in this case) to access Kernel APIs. Let me know if there is a
> better way to do it.
I understood the symbols are exported for such modularized builds.
However, making them non-GPL exposes them to any out-of-tree modules,
although, the resource types are supposed to stay hardcoded in the misc
controller. So my point was to make them EXPORT_SYMBOL_GPL to mark
they're just a means of implementing the modularized builds and not an
API. (But they'd remain API for out-of-tree GPL modules anyway, so take
this reasoning of mine with a grain of salt.)
Michal
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next prev parent reply other threads:[~2021-03-15 19:10 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-04 23:19 [Patch v3 0/2] cgroup: New misc cgroup controller Vipin Sharma
2021-03-04 23:19 ` [Patch v3 1/2] cgroup: sev: Add " Vipin Sharma
2021-03-11 18:59 ` Michal Koutný
2021-03-12 19:07 ` Vipin Sharma
2021-03-15 18:34 ` Michal Koutný
2021-03-12 19:48 ` Vipin Sharma
2021-03-12 20:51 ` Sean Christopherson
2021-03-12 21:18 ` Tom Lendacky
2021-03-19 21:28 ` Jacob Pan
2021-03-22 18:54 ` Vipin Sharma
2021-03-24 16:17 ` Jacob Pan
2021-03-24 22:09 ` Vipin Sharma
2021-03-04 23:19 ` [Patch v3 2/2] cgroup: sev: Miscellaneous cgroup documentation Vipin Sharma
2021-03-07 12:48 ` [Patch v3 0/2] cgroup: New misc cgroup controller Tejun Heo
2021-03-11 18:58 ` Michal Koutný
2021-03-11 19:39 ` Tejun Heo
2021-03-12 17:49 ` Vipin Sharma
2021-03-15 19:10 ` Michal Koutný [this message]
2021-03-22 18:24 ` Vipin Sharma
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