linux-kernel - Re: futex testsuite suggestion...

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Date:	Mon, 24 Nov 2014 17:07:23 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	dvhart@...radead.org
Cc:	dvhart@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: futex testsuite suggestion...

From: Darren Hart <dvhart@...radead.org>
Date: Sat, 22 Nov 2014 00:02:39 -0800

> From your suggestion I put together a simple transparent hugepage functional
> test. See the "thp" branch, functional/futex_wait_thp.c.
> 
> I'd like your thoughts on if this functions as desired. Is the simple single
> threaded timeout sufficient, or would you prefer to see a waiter/waker pair of
> threads for each iteration?
> 
> Some TODOs still:
> 
> I wasn't sure if there was a way to test for hugepagesize and my quick search
> didn't reveal anything (other than /proc/meminfo).
> 
> Check at runtime if the test is getting a huge page, otherwise it just reports
> success, but used several regular pages instead.

This looks excellent!  I did a test run on my sparc64 box and it passed
as well.

I do not thinks thread waiter/waker pairs are necessary for this test.

And indeed I do not know of any way other than /proc/meminfo to test
for this.  Perhaps there are some tricks in the LTP testsuite?

Thanks!
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