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From: David Miller <davem@davemloft.net>
To: dvhart@linux.intel.com
Cc: linux-kernel@vger.kernel.org
Subject: futex testsuite suggestion...
Date: Mon, 27 Oct 2014 15:56:56 -0400 (EDT)	[thread overview]
Message-ID: <20141027.155656.1414383076601514662.davem@davemloft.net> (raw)


First of all, thanks so much for writing your futex test suite, it's
proved invaluable for sparc64 kernel development for me lately.

I'd like to suggest that you add a test that triggers transparent
hugepages, because if an architecture doesn't implement
__get_user_pages_fast() such futexes cause a machine to hang.

I hacked up something simple that took the existing performance
test and made it operate in a register allocated using memalign().

I would suggest doing a memalign(HUGEPAGE_SIZE, HUGEPAGE_SIZE) then
iterating running a futex test within each normal page within that
hugepage.

Thanks!

             reply	other threads:[~2014-10-27 19:57 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-10-27 19:56 David Miller [this message]
2014-10-27 20:29 ` Darren Hart
2014-10-27 20:31   ` David Miller
2014-11-22  8:02     ` Darren Hart
2014-11-24 22:07       ` David Miller

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