Messages in this thread | | | Date | Tue, 5 Feb 2013 15:58:54 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH] rwsem: steal writing sem for better performance |
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* Alex Shi <alex.shi@intel.com> wrote:
> Commit 5a50508 change to rwsem from mutex, that cause aim7 fork_test > dropped 50%. Yuanhan liu does a good analysis, find it caused by > strict sequential writing. Ingo suggest stealing sem writing from > front task in waiting queue. https://lkml.org/lkml/2013/1/29/84 > So has this patch. > > In this patch, I just allow writing steal happen when the > first waiter is also writer. Then the performance fully > recovered.
All the aim7 fork_test performance regression is recovered?
Thanks,
Ingo
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