From: Mikko Ylinen <mikko.ylinen@linux.intel.com>
To: "Huang, Kai" <kai.huang@intel.com>
Cc: "Mehta, Sohil" <sohil.mehta@intel.com>,
"jarkko@kernel.org" <jarkko@kernel.org>,
"x86@kernel.org" <x86@kernel.org>,
"dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
"cgroups@vger.kernel.org" <cgroups@vger.kernel.org>,
"hpa@zytor.com" <hpa@zytor.com>,
"mingo@redhat.com" <mingo@redhat.com>,
"tj@kernel.org" <tj@kernel.org>,
"mkoutny@suse.com" <mkoutny@suse.com>,
"haitao.huang@linux.intel.com" <haitao.huang@linux.intel.com>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"linux-sgx@vger.kernel.org" <linux-sgx@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"bp@alien8.de" <bp@alien8.de>,
"seanjc@google.com" <seanjc@google.com>,
"Zhang, Bo" <zhanb@microsoft.com>,
"kristen@linux.intel.com" <kristen@linux.intel.com>,
"anakrish@microsoft.com" <anakrish@microsoft.com>,
"sean.j.christopherson@intel.com"
<sean.j.christopherson@intel.com>,
"Li, Zhiquan1" <zhiquan1.li@intel.com>,
"yangjie@microsoft.com" <yangjie@microsoft.com>
Subject: Re: [PATCH v6 09/12] x86/sgx: Restructure top-level EPC reclaim function
Date: Mon, 18 Dec 2023 19:32:05 +0200 [thread overview]
Message-ID: <ZYCCFXZiMpaaYPKv@himmelriiki> (raw)
In-Reply-To: <73ed579be8ad81835df1c309b7c69b491b7f2c8e.camel@intel.com>
On Mon, Dec 18, 2023 at 01:44:56AM +0000, Huang, Kai wrote:
>
> Let's focus on enabling functionality first. When you have some real
> performance issue that is related to this, we can come back then.
>
> Btw, I think you need to step back even further. IIUC the whole multiple LRU
> thing isn't mandatory in this initial support.
>
> Please (again) take a look at the comments from Dave and Michal:
>
> https://lore.kernel.org/lkml/7a1a5125-9da2-47b6-ba0f-cf24d84df16b@intel.com/#t
> https://lore.kernel.org/lkml/yz44wukoic3syy6s4fcrngagurkjhe2hzka6kvxbajdtro3fwu@zd2ilht7wcw3/
I don't think setting a hard limit without any reclaiming is preferred.
I'd rather see this similar to what the "sgx_epc.high" was in the RFC
patchset: misc.max for sgx_epc becomes the max value for EPC usage but
enclaves larger than the limit would still run OK. Per-cgroup reclaiming
allows additional controls via memory.high/max in the same cgroup.
If this reclaim flexibily was not there, the sgx_epc limit would always
have to be set based on some "peak" EPC consumption which may not even
be known at the time the limit is set.
From a container runtime perspective (which is what I'm working for Kubernetes)
the current proposal seems best to me: a container is guaranteed at most
the amount of EPC set as the limit and no other container gets to use it.
Also, each container gets charged for reclaiming independently if a low
max value is used (which might be desirable to get more containers to run on the
same node/system). In this model, the sum of containers' max values would be
the capacity.
-- Mikko
next prev parent reply other threads:[~2023-12-18 17:32 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-30 18:20 [PATCH v6 00/12] Add Cgroup support for SGX EPC memory Haitao Huang
2023-10-30 18:20 ` [PATCH v6 01/12] cgroup/misc: Add per resource callbacks for CSS events Haitao Huang
2023-11-15 20:25 ` Jarkko Sakkinen
2024-01-09 3:37 ` Haitao Huang
2024-01-10 19:55 ` Jarkko Sakkinen
2024-01-05 9:45 ` Michal Koutný
2024-01-06 1:42 ` Haitao Huang
2023-10-30 18:20 ` [PATCH v6 02/12] cgroup/misc: Export APIs for SGX driver Haitao Huang
2023-10-30 18:20 ` [PATCH v6 03/12] cgroup/misc: Add SGX EPC resource type Haitao Huang
2023-10-30 18:20 ` [PATCH v6 04/12] x86/sgx: Implement basic EPC misc cgroup functionality Haitao Huang
2023-11-06 12:09 ` Huang, Kai
2023-11-06 18:59 ` Haitao Huang
2023-11-06 22:18 ` Huang, Kai
2023-11-07 1:16 ` Haitao Huang
2023-11-07 2:08 ` Haitao Huang
2023-11-07 19:07 ` Huang, Kai
2023-11-20 3:16 ` Huang, Kai
2023-11-26 16:01 ` Haitao Huang
2023-11-26 16:32 ` Haitao Huang
2023-11-06 22:23 ` Huang, Kai
2023-11-15 20:48 ` Jarkko Sakkinen
2023-10-30 18:20 ` [PATCH v6 05/12] x86/sgx: Add sgx_epc_lru_list to encapsulate LRU list Haitao Huang
2023-10-30 18:20 ` [PATCH v6 06/12] x86/sgx: Use sgx_epc_lru_list for existing active page list Haitao Huang
2023-10-30 18:20 ` [PATCH v6 07/12] x86/sgx: Introduce EPC page states Haitao Huang
2023-11-15 20:53 ` Jarkko Sakkinen
2024-01-05 17:57 ` Dave Hansen
2024-01-06 1:45 ` Haitao Huang
2023-10-30 18:20 ` [PATCH v6 08/12] x86/sgx: Use a list to track to-be-reclaimed pages Haitao Huang
2023-11-15 20:59 ` Jarkko Sakkinen
2023-10-30 18:20 ` [PATCH v6 09/12] x86/sgx: Restructure top-level EPC reclaim function Haitao Huang
2023-11-20 3:45 ` Huang, Kai
2023-11-26 16:27 ` Haitao Huang
2023-11-27 9:57 ` Huang, Kai
2023-12-12 4:04 ` Haitao Huang
2023-12-13 11:17 ` Huang, Kai
2023-12-15 19:49 ` Haitao Huang
2023-12-18 1:44 ` Huang, Kai
2023-12-18 17:32 ` Mikko Ylinen [this message]
2023-12-18 21:24 ` Haitao Huang
2024-01-03 16:37 ` Dave Hansen
2024-01-04 19:11 ` Haitao Huang
2024-01-04 19:19 ` Jarkko Sakkinen
2024-01-04 19:27 ` Dave Hansen
2024-01-04 21:01 ` Haitao Huang
2024-01-05 14:43 ` Mikko Ylinen
2024-01-04 12:38 ` Michal Koutný
2024-01-04 19:20 ` Haitao Huang
2024-01-12 17:07 ` Haitao Huang
2024-01-13 21:04 ` Jarkko Sakkinen
2024-01-13 21:08 ` Jarkko Sakkinen
2023-10-30 18:20 ` [PATCH v6 10/12] x86/sgx: Implement EPC reclamation for cgroup Haitao Huang
2023-11-06 15:58 ` [PATCH] x86/sgx: Charge proper mem_cgroup for usage due to EPC reclamation by cgroups Haitao Huang
2023-11-06 16:10 ` [PATCH v6 10/12] x86/sgx: Implement EPC reclamation for cgroup Haitao Huang
2023-10-30 18:20 ` [PATCH v6 11/12] Docs/x86/sgx: Add description for cgroup support Haitao Huang
2023-10-30 18:20 ` [PATCH v6 12/12] selftests/sgx: Add scripts for EPC cgroup testing Haitao Huang
2023-11-15 21:00 ` Jarkko Sakkinen
2023-11-15 21:22 ` Haitao Huang
2023-11-06 3:26 ` [PATCH v6 00/12] Add Cgroup support for SGX EPC memory Jarkko Sakkinen
2023-11-06 15:48 ` Haitao Huang
2023-11-08 1:00 ` Haitao Huang
2024-01-05 18:29 ` Dave Hansen
2024-01-05 20:13 ` Haitao Huang
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