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convert mmap_sem to a scalable rw_mutex

Peter Zijlstra linux-mm lkml 1 version In review

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  1. v1 Latest2 patches 47 repliesIn review

Patches in v1 No applies recorded yet

#Subject and filesSizeRepliesApplied
1/2scalable rw_mutexinclude/linux/rwmutex.h kernel/Makefile kernel/rwmutex.c+237 -127 replies
2/2mm: change mmap_sem over to the scalable rw_mutexarch/alpha/kernel/osf_sys.c arch/alpha/kernel/traps.c arch/alpha/mm/fault.c +136 more+740 -7364 replies

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Cover letter [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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