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

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.


             reply	other threads:[~2008-10-15 17:58 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-10-15 17:45 Martin Schwidefsky [this message]
2008-10-15 17:45 ` [patch 1/2] arch_setup_additional_pages arguments Martin Schwidefsky
2008-10-15 17:45 ` [patch 2/2] introduce vdso on s390 Martin Schwidefsky
2008-10-17 15:34   ` Bastian Blank
2008-10-20 13:06     ` Heiko Carstens

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