linux-kernel - Re: [PATCH v10 14/14] selftests/sgx: Add scripts for EPC cgroup testing

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Message-Id: <D071SWVSOJLN.2C9H7NTS4PHGI@kernel.org>
Date: Sat, 30 Mar 2024 13:29:16 +0200
From: "Jarkko Sakkinen" <jarkko@...nel.org>
To: "Haitao Huang" <haitao.huang@...ux.intel.com>,
 <dave.hansen@...ux.intel.com>, <kai.huang@...el.com>, <tj@...nel.org>,
 <mkoutny@...e.com>, <linux-kernel@...r.kernel.org>,
 <linux-sgx@...r.kernel.org>, <x86@...nel.org>, <cgroups@...r.kernel.org>,
 <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>, <hpa@...or.com>,
 <sohil.mehta@...el.com>, <tim.c.chen@...ux.intel.com>
Cc: <zhiquan1.li@...el.com>, <kristen@...ux.intel.com>, <seanjc@...gle.com>,
 <zhanb@...rosoft.com>, <anakrish@...rosoft.com>,
 <mikko.ylinen@...ux.intel.com>, <yangjie@...rosoft.com>,
 <chrisyan@...rosoft.com>
Subject: Re: [PATCH v10 14/14] selftests/sgx: Add scripts for EPC cgroup
 testing

On Thu Mar 28, 2024 at 2:22 AM EET, Haitao Huang wrote:
> The scripts rely on cgroup-tools package from libcgroup [1].
>
> To run selftests for epc cgroup:
>
> sudo ./run_epc_cg_selftests.sh
>
> To watch misc cgroup 'current' changes during testing, run this in a
> separate terminal:
>
> ./watch_misc_for_tests.sh current
>
> With different cgroups, the script starts one or multiple concurrent SGX
> selftests, each to run one unclobbered_vdso_oversubscribed test.  Each
> of such test tries to load an enclave of EPC size equal to the EPC
> capacity available on the platform. The script checks results against
> the expectation set for each cgroup and reports success or failure.
>
> The script creates 3 different cgroups at the beginning with following
> expectations:
>
> 1) SMALL - intentionally small enough to fail the test loading an
> enclave of size equal to the capacity.
> 2) LARGE - large enough to run up to 4 concurrent tests but fail some if
> more than 4 concurrent tests are run. The script starts 4 expecting at
> least one test to pass, and then starts 5 expecting at least one test
> to fail.
> 3) LARGER - limit is the same as the capacity, large enough to run lots of
> concurrent tests. The script starts 8 of them and expects all pass.
> Then it reruns the same test with one process randomly killed and
> usage checked to be zero after all process exit.
>
> The script also includes a test with low mem_cg limit and LARGE sgx_epc
> limit to verify that the RAM used for per-cgroup reclamation is charged
> to a proper mem_cg.
>
> [1] https://github.com/libcgroup/libcgroup/blob/main/README
>
> Signed-off-by: Haitao Huang <haitao.huang@...ux.intel.com>

My previous comments and you have two undocumented dependencies for your
selftest (I searched for cgexec and cgroups-tools as keywords).

BR, Jarkko