From: Dave Hansen <dave.hansen@intel.com>
To: "Haitao Huang" <haitao.huang@linux.intel.com>,
"Michal Koutný" <mkoutny@suse.com>
Cc: "Christopherson,, Sean" <seanjc@google.com>,
"Huang, Kai" <kai.huang@intel.com>,
"Zhang, Bo" <zhanb@microsoft.com>,
"linux-sgx@vger.kernel.org" <linux-sgx@vger.kernel.org>,
"cgroups@vger.kernel.org" <cgroups@vger.kernel.org>,
"yangjie@microsoft.com" <yangjie@microsoft.com>,
"dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
"Li, Zhiquan1" <zhiquan1.li@intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"mingo@redhat.com" <mingo@redhat.com>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"tj@kernel.org" <tj@kernel.org>,
"anakrish@microsoft.com" <anakrish@microsoft.com>,
"jarkko@kernel.org" <jarkko@kernel.org>,
"hpa@zytor.com" <hpa@zytor.com>,
"mikko.ylinen@linux.intel.com" <mikko.ylinen@linux.intel.com>,
"Mehta, Sohil" <sohil.mehta@intel.com>,
"bp@alien8.de" <bp@alien8.de>, "x86@kernel.org" <x86@kernel.org>,
"kristen@linux.intel.com" <kristen@linux.intel.com>
Subject: Re: [PATCH v5 12/18] x86/sgx: Add EPC OOM path to forcefully reclaim EPC
Date: Wed, 18 Oct 2023 08:37:25 -0700 [thread overview]
Message-ID: <7a1a5125-9da2-47b6-ba0f-cf24d84df16b@intel.com> (raw)
In-Reply-To: <op.2c0nt109wjvjmi@hhuan26-mobl.amr.corp.intel.com>
On 10/18/23 08:26, Haitao Huang wrote:
> Maybe not in sense of killing something. My understanding memory.reclaim
> does not necessarily invoke the OOM killer. But what I really intend to
> say is we can have a separate knob for user to express the need for
> reducing the current usage explicitly and keep "misc.max' non-preemptive
> semantics intact. When we implement that new knob, then we can define
> what kind of reclaim for that. Depending on vEPC implementation, it may
> or may not involve killing VMs. But at least that semantics will be
> explicit for user.
I'm really worried that you're going for "perfect" semantics here. This
is SGX. It's *NOT* getting heavy use and even fewer folks will ever
apply cgroup controls to it.
Can we please stick to simple, easily-coded rules here? I honestly
don't think these corner cases matter all that much and there's been
*WAY* too much traffic in this thread for what is ultimately not that
complicated. Focus on *ONE* thing:
1. Admin sets a limit
2. Enclave is created
3. Enclave hits limit, allocation fails
Nothing else matters. What if the admin lowers the limit on an
already-created enclave? Nobody cares. Seriously. What about inducing
reclaim? Nobody cares. What about vEPC? Doesn't matter, an enclave
page is an enclave page.
next prev parent reply other threads:[~2023-10-18 15:46 UTC|newest]
Thread overview: 119+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-23 3:06 [PATCH v5 00/18] Add Cgroup support for SGX EPC memory Haitao Huang
2023-09-23 3:06 ` [PATCH v5 01/18] cgroup/misc: Add per resource callbacks for CSS events Haitao Huang
2023-09-25 17:09 ` Jarkko Sakkinen
2023-09-26 3:04 ` Haitao Huang
2023-09-26 13:10 ` Jarkko Sakkinen
2023-09-26 13:13 ` Jarkko Sakkinen
2023-09-27 1:56 ` Haitao Huang
2023-10-02 22:47 ` Jarkko Sakkinen
2023-10-02 22:55 ` Jarkko Sakkinen
2023-10-04 15:45 ` Haitao Huang
2023-10-04 17:18 ` Tejun Heo
2023-09-27 9:20 ` Huang, Kai
2023-10-03 14:29 ` Haitao Huang
2023-10-17 18:55 ` Michal Koutný
2023-09-23 3:06 ` [PATCH v5 02/18] cgroup/misc: Add SGX EPC resource type and export APIs for SGX driver Haitao Huang
2023-09-25 18:50 ` Tejun Heo
2023-09-28 3:59 ` Huang, Kai
2023-10-03 7:00 ` Haitao Huang
2023-10-03 19:33 ` Huang, Kai
2023-09-23 3:06 ` [PATCH v5 03/18] x86/sgx: Add sgx_epc_lru_lists to encapsulate LRU lists Haitao Huang
2023-09-23 3:06 ` [PATCH v5 04/18] x86/sgx: Use sgx_epc_lru_lists for existing active page list Haitao Huang
2023-09-23 3:06 ` [PATCH v5 05/18] x86/sgx: Store reclaimable EPC pages in sgx_epc_lru_lists Haitao Huang
2023-09-27 10:14 ` Huang, Kai
2023-09-23 3:06 ` [PATCH v5 06/18] x86/sgx: Introduce EPC page states Haitao Huang
2023-09-25 17:11 ` Jarkko Sakkinen
2023-09-27 10:28 ` Huang, Kai
2023-10-03 4:49 ` Haitao Huang
2023-10-03 20:03 ` Huang, Kai
2023-10-04 15:24 ` Haitao Huang
2023-10-04 21:05 ` Huang, Kai
2023-09-23 3:06 ` [PATCH v5 07/18] x86/sgx: Introduce RECLAIM_IN_PROGRESS state Haitao Huang
2023-09-25 17:13 ` Jarkko Sakkinen
2023-09-27 10:42 ` Huang, Kai
2023-09-23 3:06 ` [PATCH v5 08/18] x86/sgx: Use a list to track to-be-reclaimed pages Haitao Huang
2023-09-28 9:28 ` Huang, Kai
2023-10-03 5:09 ` Haitao Huang
2023-09-23 3:06 ` [PATCH v5 09/18] x86/sgx: Store struct sgx_encl when allocating new VA pages Haitao Huang
2023-09-27 11:14 ` Huang, Kai
2023-09-27 15:35 ` Haitao Huang
2023-09-27 21:21 ` Huang, Kai
2023-09-29 15:06 ` Haitao Huang
2023-10-02 11:05 ` Huang, Kai
2023-09-27 11:35 ` Huang, Kai
2023-10-03 6:45 ` Haitao Huang
2023-10-03 20:07 ` Huang, Kai
2023-10-04 15:03 ` Haitao Huang
2023-10-04 21:13 ` Huang, Kai
2023-10-05 4:22 ` Haitao Huang
2023-10-05 6:49 ` Huang, Kai
2023-09-23 3:06 ` [PATCH v5 10/18] x86/sgx: Add EPC page flags to identify owner types Haitao Huang
2023-09-23 3:06 ` [PATCH v5 11/18] x86/sgx: store unreclaimable pages in LRU lists Haitao Huang
2023-09-27 11:57 ` Huang, Kai
2023-10-03 5:42 ` Haitao Huang
2023-09-28 9:41 ` Huang, Kai
2023-10-03 5:15 ` Haitao Huang
2023-10-03 20:12 ` Huang, Kai
2023-09-23 3:06 ` [PATCH v5 12/18] x86/sgx: Add EPC OOM path to forcefully reclaim EPC Haitao Huang
2023-10-09 23:45 ` Huang, Kai
2023-10-10 0:23 ` Sean Christopherson
2023-10-10 0:50 ` Huang, Kai
2023-10-10 1:34 ` Huang, Kai
2023-10-10 16:49 ` Haitao Huang
2023-10-11 0:51 ` Huang, Kai
2023-10-12 13:27 ` Haitao Huang
2023-10-16 10:57 ` Huang, Kai
2023-10-16 19:52 ` Haitao Huang
2023-10-16 21:09 ` Huang, Kai
2023-10-17 0:10 ` Haitao Huang
2023-10-17 1:34 ` Huang, Kai
2023-10-17 12:58 ` Haitao Huang
2023-10-17 18:54 ` Michal Koutný
2023-10-17 19:13 ` Michal Koutný
2023-10-18 4:39 ` Haitao Huang
2023-10-18 4:37 ` Haitao Huang
2023-10-18 13:55 ` Dave Hansen
2023-10-18 15:26 ` Haitao Huang
2023-10-18 15:37 ` Dave Hansen [this message]
2023-10-18 15:52 ` Michal Koutný
2023-10-18 16:25 ` Haitao Huang
2023-10-16 21:32 ` Sean Christopherson
2023-10-17 0:09 ` Haitao Huang
2023-10-17 15:43 ` Sean Christopherson
2023-10-17 11:49 ` Mikko Ylinen
2023-10-11 1:14 ` Huang, Kai
2023-10-16 11:02 ` Huang, Kai
2023-10-10 1:42 ` Haitao Huang
2023-10-10 2:23 ` Huang, Kai
2023-10-10 13:26 ` Haitao Huang
2023-10-11 0:01 ` Sean Christopherson
2023-10-11 15:02 ` Haitao Huang
2023-10-10 1:04 ` Haitao Huang
2023-10-10 1:18 ` Huang, Kai
2023-10-10 1:38 ` Haitao Huang
2023-10-10 2:12 ` Huang, Kai
2023-10-10 17:05 ` Haitao Huang
2023-10-11 0:31 ` Huang, Kai
2023-10-11 16:04 ` Haitao Huang
2023-09-23 3:06 ` [PATCH v5 13/18] x86/sgx: Expose sgx_reclaim_pages() for use by EPC cgroup Haitao Huang
2023-10-05 12:24 ` Huang, Kai
2023-10-05 19:23 ` Haitao Huang
2023-10-05 20:25 ` Huang, Kai
2023-09-23 3:06 ` [PATCH v5 14/18] x86/sgx: Add helper to grab pages from an arbitrary EPC LRU Haitao Huang
2023-09-23 3:06 ` [PATCH v5 15/18] x86/sgx: Prepare for multiple LRUs Haitao Huang
2023-10-05 12:30 ` Huang, Kai
2023-10-05 19:33 ` Haitao Huang
2023-10-05 20:38 ` Huang, Kai
2023-09-23 3:06 ` [PATCH v5 16/18] x86/sgx: Limit process EPC usage with misc cgroup controller Haitao Huang
2023-09-25 17:15 ` Jarkko Sakkinen
2023-10-05 21:01 ` Huang, Kai
2023-10-10 0:12 ` Huang, Kai
2023-10-10 0:16 ` Huang, Kai
2023-10-10 0:26 ` Huang, Kai
2023-10-22 18:26 ` Haitao Huang
2023-10-10 9:19 ` Huang, Kai
2023-10-10 9:32 ` Huang, Kai
2023-10-17 18:54 ` Michal Koutný
2023-10-19 16:05 ` Haitao Huang
2023-09-23 3:06 ` [PATCH v5 17/18] Docs/x86/sgx: Add description for cgroup support Haitao Huang
2023-09-23 3:06 ` [PATCH v5 18/18] selftests/sgx: Add scripts for EPC cgroup testing Haitao Huang
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