How do linux-kernel schedule processes with weight value?
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I am reading "Linux Kernel Development" and I don't understand weight value of process. In linux kernel, each process has a nice value, and then mapping nice value to weight.
- I think weight is "the proportion of processor time". it mean process'runtime allocated is: its weight/(total weight of all process)* (processor time). if result of above formula is 10%, but actual the runtime of process lower than 10%, it is priority. Right?
- I'm confused about how cfs check it. Does cfs check periodly (e.g. 1 milisecond) and update runtime of process, compare the proportion of actual runtime/process'runtime allocated with the chosen minimum and run it ? By the way, can you list some function used?
linux-kernel
edited 4 mins ago
炸鱼薯条德里克
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NAMNAM
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I am reading "Linux Kernel Development" and I don't understand weight value of process. In linux kernel, each process has a nice value, and then mapping nice value to weight.
- I think weight is "the proportion of processor time". it mean process'runtime allocated is: its weight/(total weight of all process)* (processor time). if result of above formula is 10%, but actual the runtime of process lower than 10%, it is priority. Right?
- I'm confused about how cfs check it. Does cfs check periodly (e.g. 1 milisecond) and update runtime of process, compare the proportion of actual runtime/process'runtime allocated with the chosen minimum and run it ? By the way, can you list some function used?
linux-kernel
edited 4 mins ago
炸鱼薯条德里克
5521216
asked 29 mins ago
NAMNAM
11
New contributor
NAM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
0
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I am reading "Linux Kernel Development" and I don't understand weight value of process. In linux kernel, each process has a nice value, and then mapping nice value to weight.
- I think weight is "the proportion of processor time". it mean process'runtime allocated is: its weight/(total weight of all process)* (processor time). if result of above formula is 10%, but actual the runtime of process lower than 10%, it is priority. Right?
- I'm confused about how cfs check it. Does cfs check periodly (e.g. 1 milisecond) and update runtime of process, compare the proportion of actual runtime/process'runtime allocated with the chosen minimum and run it ? By the way, can you list some function used?
linux-kernel
edited 4 mins ago
炸鱼薯条德里克
5521216
asked 29 mins ago
NAMNAM
11
New contributor
NAM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I am reading "Linux Kernel Development" and I don't understand weight value of process. In linux kernel, each process has a nice value, and then mapping nice value to weight.
- I think weight is "the proportion of processor time". it mean process'runtime allocated is: its weight/(total weight of all process)* (processor time). if result of above formula is 10%, but actual the runtime of process lower than 10%, it is priority. Right?
- I'm confused about how cfs check it. Does cfs check periodly (e.g. 1 milisecond) and update runtime of process, compare the proportion of actual runtime/process'runtime allocated with the chosen minimum and run it ? By the way, can you list some function used?
linux-kernel
linux-kernel
edited 4 mins ago
炸鱼薯条德里克
5521216
asked 29 mins ago
NAMNAM
11
New contributor
NAM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 4 mins ago
炸鱼薯条德里克
5521216
asked 29 mins ago
NAMNAM
11
New contributor
NAM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 4 mins ago
炸鱼薯条德里克
5521216
edited 4 mins ago
炸鱼薯条德里克
5521216
edited 4 mins ago
炸鱼薯条德里克
5521216
5521216
asked 29 mins ago
NAMNAM
11
New contributor
NAM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 29 mins ago
NAMNAM
11
asked 29 mins ago
NAMNAM
11
11
New contributor
NAM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
NAM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
NAM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
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