linux-kernel - [patch 0/2] vdso support for s390

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Message-Id: <20081015174506.107691579@de.ibm.com>
Date:	Wed, 15 Oct 2008 19:45:06 +0200
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	linux-arch@...r.kernel.org
Cc:	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: [patch 0/2] vdso support for s390

Greetings,
the two patches in this series add a vdso to s390 for three system calls:
1) gettimeofday
2) clock_getres for CLOCK_REALTIME and CLOCK_MONOTONIC
3) clock_gettime for CLOCK_REALTIME and CLOCK_MONOTONIC
The vdso code for gettimeofday is about 4-5 times faster than the system
call. Similar results for clock_gettime.

The first of the two patches changes the arch_setup_additional_pages
function. The second argument is unused and can be removed. For the
s390 vdso I want to know if the elf executable is dynamically linked
or not. Only if an interpreter is used the vdso is mapped. This adds
a second argument to arch_setup_additional_pages again but with a
different semantic.

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

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