linux-kernel - Re: [PATCH v9 15/15] selftests/sgx: Add scripts for EPC cgroup testing

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Date: Tue, 2 Apr 2024 08:42:56 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Jarkko Sakkinen <jarkko@...nel.org>,
 Haitao Huang <haitao.huang@...ux.intel.com>, dave.hansen@...ux.intel.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 v9 15/15] selftests/sgx: Add scripts for EPC cgroup
 testing

On 3/30/24 04:23, Jarkko Sakkinen wrote:
>>> I also wonder is cgroup-tools dependency absolutely required or could
>>> you just have a function that would interact with sysfs?
>> I should have checked email before hit the send button for v10 🙂.
>>
>> It'd be more complicated and less readable to do all the stuff without the  
>> cgroup-tools, esp cgexec. I checked dependency, cgroup-tools only depends  
>> on libc so I hope this would not cause too much inconvenience.
> As per cgroup-tools, please prove this. It makes the job for more
> complicated *for you* and you are making the job more  complicated
> to every possible person in the planet running any kernel QA.

I don't see any other use of cgroup-tools in testing/selftests.

I *DO* see a ton of /bin/bash use though.  I wouldn't go to much trouble
to make the thing ash-compatible.

That said, the most important thing is to get some selftests in place.
If using cgroup-tools means we get actual, runnable tests in place,
that's a heck of a lot more important than making them perfect.
Remember, almost nobody uses SGX.  It's available on *VERY* few systems
from one CPU vendor and only in very specific hardware configurations.