linux-kernel - Re: [RFC PATCH 0/2] improve vmalloc allocation

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Message-ID: <98842edb-d462-96b1-311f-27c6ebfc108a@kernel.org>
Date:   Tue, 23 Oct 2018 11:13:36 -0600
From:   Shuah Khan <shuah@...nel.org>
To:     Michal Hocko <mhocko@...nel.org>,
        Matthew Wilcox <willy@...radead.org>
Cc:     Uladzislau Rezki <urezki@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>,
        Thomas Garnier <thgarnie@...gle.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Joel Fernandes <joelaf@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...e.hu>, Tejun Heo <tj@...nel.org>,
        Shuah Khan <shuah@...nel.org>
Subject: Re: [RFC PATCH 0/2] improve vmalloc allocation

On 10/23/2018 11:05 AM, Michal Hocko wrote:
> On Tue 23-10-18 08:26:40, Matthew Wilcox wrote:
>> On Tue, Oct 23, 2018 at 09:02:56AM -0600, Shuah Khan wrote:
> [...]
>>> The way it can be handled is by adding a test module under lib. test_kmod,
>>> test_sysctl, test_user_copy etc.
>>
>> The problem is that said module can only invoke functions which are
>> exported using EXPORT_SYMBOL.  And there's a cost to exporting them,
>> which I don't think we're willing to pay, purely to get test coverage.
> 
> Yes, I think we do not want to export internal functionality which might
> be still interesting for the testing coverage. Maybe we want something
> like EXPORT_SYMBOL_KSELFTEST which would allow to link within the
> kselftest machinery but it wouldn't allow the same for general modules
> and will not give any API promisses.
> 

I like this proposal. I think we will open up lot of test opportunities with
this approach.

Maybe we can use this stress test as a pilot and see where it takes us.

thanks,
-- Shuah