| From: |
| Peter Zijlstra <a.p.zijlstra@chello.nl> |
| To: |
| linux-mm@kvack.org, linux-kernel@vger.kernel.org |
| Subject: |
| [PATCH 0/2] convert mmap_sem to a scalable rw_mutex |
| Date: |
| Fri, 11 May 2007 15:15:41 +0200 |
| Cc: |
| Oleg Nesterov <oleg@tv-sign.ru>,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@elte.hu>,
Thomas Gleixner <tglx@linutronix.de>,
Nick Piggin <npiggin@suse.de> |
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
--
