Messages in this thread |  | | Subject | Re: [patch v2 0/4] percpu_counter: cleanup and fix | From | Shaohua Li <> | Date | Thu, 14 Apr 2011 09:04:13 +0800 |
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On Wed, 2011-04-13 at 22:08 +0800, Christoph Lameter wrote: > On Wed, 13 Apr 2011, shaohua.li@intel.com wrote: > > > Cleanup percpu_counter code and fix some bugs. The main purpose is to convert > > percpu_counter to use atomic64, which is useful for workloads which cause > > percpu_counter->lock contented. In a workload I tested, the atomic method is > > 50x faster (please see patch 4 for detail). > > Could you post your test and the results please? the test is very simple, 24 processes in 24 CPU, and each does: while (1) { mmap(128M); munmap(128M) } we then measure how many loops the process can do. I'll attach the test in next post. Just found when I said 50x faster, I actually forgot one other patch's effect, which is http://marc.info/?l=linux-kernel&m=130127782901127&w=2. If only having the atomic change, it's about 7x faster. Sorry about this. I'll add detail data in next post.
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