On Jul 7, 2018 7:37 AM, bing zhu <zhubohon...@gmail.com> wrote: > > Dear Sir/Ma'am > Thank you for your time ,i'm a student new to linux kernel. > I have a question about memcpy,i noticed that memcpy is faster in kernel than > in user space > for example : > in a module helloworld , i use memcpy to copy a 4096B to a block of memory > for like 10000 times > and in user space i do the same thing,I noticed that kernel is faster than > user , > is it possible that in kernel when i insmod hello it can not be scheduled but > in user space it will so kernel is faster?
This makes sense, less context switches. > is there a possible way that a user task can run a block of code that > uninterruptable? No switch ,no schedule ? I don't think this is possible, Linux is a preemptive kernel. > Thank you !
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