Messages in this thread | | | Date | Wed, 4 May 2016 15:53:45 +0200 | From | Thomas Petazzoni <> | Subject | Re: kmap_atomic and preemption |
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Hello,
On Wed, 4 May 2016 15:47:29 +0200, Peter Zijlstra wrote:
> static inline void *kmap_atomic(struct page *page) > { > preempt_disable(); > pagefault_disable(); > if (!PageHighMem(page)) > return page_address(page); > > return __kmap_atomic(page); > }
This is essentially what has been done on ARM in commit 9ff0bb5ba60638a688a46e93df8c5009896672eb, showing a pretty significant improvement in network workloads.
Best regards,
Thomas -- Thomas Petazzoni, CTO, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com
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