linux-kernel - [PATCH 0/2] convert mmap_sem to a scalable rw

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Message-Id: <20070511131541.992688403@chello.nl>
Date:	Fri, 11 May 2007 15:15:41 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:	Oleg Nesterov <oleg@...sign.ru>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nick Piggin <npiggin@...e.de>
Subject: [PATCH 0/2] convert mmap_sem to a scalable rw_mutex


I was toying with a scalable rw_mutex and found that it gives ~10% reduction in
system time on ebizzy runs (without the MADV_FREE patch).

2-way x86_64 pentium D box:


2.6.21

/usr/bin/time ./ebizzy -m -P
60.10user 137.72system 1:49.59elapsed 180%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+33555877minor)pagefaults 0swaps

/usr/bin/time ./ebizzy -m -P
59.73user 139.50system 1:50.28elapsed 180%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+33555878minor)pagefaults 0swaps

/usr/bin/time ./ebizzy -m -P
59.49user 137.74system 1:49.22elapsed 180%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+33555877minor)pagefaults 0swaps

2.6.21-rw_mutex

/usr/bin/time ./ebizzy -m -P
57.85user 124.30system 1:42.99elapsed 176%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+33555877minor)pagefaults 0swaps

/usr/bin/time ./ebizzy -m -P
58.09user 124.11system 1:43.18elapsed 176%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+33555876minor)pagefaults 0swaps

/usr/bin/time ./ebizzy -m -P
57.36user 124.92system 1:43.52elapsed 176%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+33555877minor)pagefaults 0swaps


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