From: "Jarkko Sakkinen" <jarkko@kernel.org>
To: "Haitao Huang" <haitao.huang@linux.intel.com>,
<dave.hansen@linux.intel.com>, <tj@kernel.org>,
<mkoutny@suse.com>, <linux-kernel@vger.kernel.org>,
<linux-sgx@vger.kernel.org>, <x86@kernel.org>,
<cgroups@vger.kernel.org>, <tglx@linutronix.de>,
<mingo@redhat.com>, <bp@alien8.de>, <hpa@zytor.com>,
<sohil.mehta@intel.com>
Cc: <zhiquan1.li@intel.com>, <kristen@linux.intel.com>,
<seanjc@google.com>, <zhanb@microsoft.com>,
<anakrish@microsoft.com>, <mikko.ylinen@linux.intel.com>,
<yangjie@microsoft.com>
Subject: Re: [PATCH v7 04/15] x86/sgx: Implement basic EPC misc cgroup functionality
Date: Fri, 02 Feb 2024 01:21:56 +0200 [thread overview]
Message-ID: <CYU4MYUKCVN2.1RWCHNS9QO7XB@suppilovahvero> (raw)
In-Reply-To: <op.2h07ypcmwjvjmi@hhuan26-mobl.amr.corp.intel.com>
On Wed Jan 24, 2024 at 5:29 AM EET, Haitao Huang wrote:
> On Mon, 22 Jan 2024 14:25:53 -0600, Jarkko Sakkinen <jarkko@kernel.org>
> wrote:
>
> > On Mon Jan 22, 2024 at 7:20 PM EET, Haitao Huang wrote:
> >> From: Kristen Carlson Accardi <kristen@linux.intel.com>
> >>
> >> SGX Enclave Page Cache (EPC) memory allocations are separate from normal
> >> RAM allocations, and are managed solely by the SGX subsystem. The
> >> existing cgroup memory controller cannot be used to limit or account for
> >> SGX EPC memory, which is a desirable feature in some environments. For
> >> example, in a Kubernates environment, a user can request certain EPC
> >> quota for a pod but the orchestrator can not enforce the quota to limit
> >> runtime EPC usage of the pod without an EPC cgroup controller.
> >>
> >> Utilize the misc controller [admin-guide/cgroup-v2.rst, 5-9. Misc] to
> >> limit and track EPC allocations per cgroup. Earlier patches have added
> >> the "sgx_epc" resource type in the misc cgroup subsystem. Add basic
> >> support in SGX driver as the "sgx_epc" resource provider:
> >>
> >> - Set "capacity" of EPC by calling misc_cg_set_capacity()
> >> - Update EPC usage counter, "current", by calling charge and uncharge
> >> APIs for EPC allocation and deallocation, respectively.
> >> - Setup sgx_epc resource type specific callbacks, which perform
> >> initialization and cleanup during cgroup allocation and deallocation,
> >> respectively.
> >>
> >> With these changes, the misc cgroup controller enables user to set a
> >> hard
> >> limit for EPC usage in the "misc.max" interface file. It reports current
> >> usage in "misc.current", the total EPC memory available in
> >> "misc.capacity", and the number of times EPC usage reached the max limit
> >> in "misc.events".
> >>
> >> For now, the EPC cgroup simply blocks additional EPC allocation in
> >> sgx_alloc_epc_page() when the limit is reached. Reclaimable pages are
> >> still tracked in the global active list, only reclaimed by the global
> >> reclaimer when the total free page count is lower than a threshold.
> >>
> >> Later patches will reorganize the tracking and reclamation code in the
> >> global reclaimer and implement per-cgroup tracking and reclaiming.
> >>
> >> Co-developed-by: Sean Christopherson <sean.j.christopherson@intel.com>
> >> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> >> Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com>
> >> Co-developed-by: Haitao Huang <haitao.huang@linux.intel.com>
> >> Signed-off-by: Haitao Huang <haitao.huang@linux.intel.com>
> >
> > For consistency sake I'd also add co-developed-by for Kristen. This is
> > at least the format suggested by kernel documentation.
> >
> She is the "From Author", so only Signed-off-by is needed for her
> according to the second example in the doc[1]?
Right but okay then Kristen afaik be the last sob so only re-ordering
is needed I guess.
>
> Thanks
> Haitao
> [1]https://docs.kernel.org/process/submitting-patches.html#when-to-use-acked-by-cc-and-co-developed-by
BR, Jarkko
next prev parent reply other threads:[~2024-02-01 23:22 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-22 17:20 [PATCH v7 00/15] Add Cgroup support for SGX EPC memory Haitao Huang
2024-01-22 17:20 ` [PATCH v7 01/15] cgroup/misc: Add per resource callbacks for CSS events Haitao Huang
2024-01-22 20:14 ` Jarkko Sakkinen
2024-01-23 16:19 ` Haitao Huang
2024-01-22 17:20 ` [PATCH v7 02/15] cgroup/misc: Export APIs for SGX driver Haitao Huang
2024-01-22 20:17 ` Jarkko Sakkinen
2024-01-22 17:20 ` [PATCH v7 03/15] cgroup/misc: Add SGX EPC resource type Haitao Huang
2024-01-22 20:18 ` Jarkko Sakkinen
2024-01-22 17:20 ` [PATCH v7 04/15] x86/sgx: Implement basic EPC misc cgroup functionality Haitao Huang
2024-01-22 20:25 ` Jarkko Sakkinen
2024-01-23 16:04 ` Haitao Huang
2024-01-24 3:29 ` Haitao Huang
2024-02-01 23:21 ` Jarkko Sakkinen [this message]
2024-01-22 17:20 ` [PATCH v7 05/15] x86/sgx: Add sgx_epc_lru_list to encapsulate LRU list Haitao Huang
2024-01-22 17:20 ` [PATCH v7 06/15] x86/sgx: Abstract tracking reclaimable pages in LRU Haitao Huang
2024-01-22 17:20 ` [PATCH v7 07/15] x86/sgx: Expose sgx_reclaim_pages() for cgroup Haitao Huang
2024-01-22 20:28 ` Jarkko Sakkinen
2024-01-22 17:20 ` [PATCH v7 08/15] x86/sgx: Implement EPC reclamation flows " Haitao Huang
2024-01-22 20:29 ` Jarkko Sakkinen
2024-01-22 17:20 ` [PATCH v7 09/15] x86/sgx: Charge mem_cgroup for per-cgroup reclamation Haitao Huang
2024-01-22 20:30 ` Jarkko Sakkinen
2024-01-26 14:37 ` Huang, Kai
2024-01-26 16:21 ` Haitao Huang
2024-02-02 23:45 ` Tim Chen
2024-02-03 0:39 ` Haitao Huang
2024-01-22 17:20 ` [PATCH v7 10/15] x86/sgx: Add EPC reclamation in cgroup try_charge() Haitao Huang
2024-01-22 17:20 ` [PATCH v7 11/15] x86/sgx: Abstract check for global reclaimable pages Haitao Huang
2024-01-22 17:20 ` [PATCH v7 12/15] x86/sgx: Expose sgx_epc_cgroup_reclaim_pages() for global reclaimer Haitao Huang
2024-01-22 20:31 ` Jarkko Sakkinen
2024-01-22 17:20 ` [PATCH v7 13/15] x86/sgx: Turn on per-cgroup EPC reclamation Haitao Huang
2024-01-22 17:20 ` [PATCH v7 14/15] Docs/x86/sgx: Add description for cgroup support Haitao Huang
2024-01-22 17:20 ` [PATCH v7 15/15] selftests/sgx: Add scripts for EPC cgroup testing Haitao Huang
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