Why is my scheduling policy is 0 (SCHED_NORMAL) but priority is 20 as well?
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I have a device which is running linux 2.6.36.
There is no file, "sched", in /proc/pid. So I use /proc/pid/stat to see what priority is being used.
The "stat" shows (as below) that my priority is 20 but in the meanwhile my policy is 0 as well.
[root]cat stat
3001 (asterisk) S 1 3001 3001 0 -1 4194624 3041 0 25 0 288 157 0 0 20 0 31 0 5426 33370112 2225 2147483647 4194304 6332812 2146804640 2146799784 728612916 0 0 4100 1074937859 4294967295 0 0 18 0 0 0 0 0 0
(Note: https://elixir.bootlin.com/linux/v2.6.36/source/Documentation/filesystems/proc.txt
Table 1-4: Contentxxxx in the above link shows the meaning of stat contents. The 18th and 41th items are priority and policy respectively.)
My question:
As I know, priority 0-99 should be RT scheduling which policy should be SHCED_FIFO or SCHED_RR. How can I have SCHED_NORMAL (policy = 0) and my priority is 20 (between 0-99)? Isn't this a conflict or how can I interpret these information?
scheduling priority
asked Mar 7 at 9:19
Wu Yuan Chun
11
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up vote
0
down vote
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I have a device which is running linux 2.6.36.
There is no file, "sched", in /proc/pid. So I use /proc/pid/stat to see what priority is being used.
The "stat" shows (as below) that my priority is 20 but in the meanwhile my policy is 0 as well.
[root]cat stat
3001 (asterisk) S 1 3001 3001 0 -1 4194624 3041 0 25 0 288 157 0 0 20 0 31 0 5426 33370112 2225 2147483647 4194304 6332812 2146804640 2146799784 728612916 0 0 4100 1074937859 4294967295 0 0 18 0 0 0 0 0 0
(Note: https://elixir.bootlin.com/linux/v2.6.36/source/Documentation/filesystems/proc.txt
Table 1-4: Contentxxxx in the above link shows the meaning of stat contents. The 18th and 41th items are priority and policy respectively.)
My question:
As I know, priority 0-99 should be RT scheduling which policy should be SHCED_FIFO or SCHED_RR. How can I have SCHED_NORMAL (policy = 0) and my priority is 20 (between 0-99)? Isn't this a conflict or how can I interpret these information?
scheduling priority
asked Mar 7 at 9:19
Wu Yuan Chun
11
add a comment |Â
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I have a device which is running linux 2.6.36.
There is no file, "sched", in /proc/pid. So I use /proc/pid/stat to see what priority is being used.
The "stat" shows (as below) that my priority is 20 but in the meanwhile my policy is 0 as well.
[root]cat stat
3001 (asterisk) S 1 3001 3001 0 -1 4194624 3041 0 25 0 288 157 0 0 20 0 31 0 5426 33370112 2225 2147483647 4194304 6332812 2146804640 2146799784 728612916 0 0 4100 1074937859 4294967295 0 0 18 0 0 0 0 0 0
(Note: https://elixir.bootlin.com/linux/v2.6.36/source/Documentation/filesystems/proc.txt
Table 1-4: Contentxxxx in the above link shows the meaning of stat contents. The 18th and 41th items are priority and policy respectively.)
My question:
As I know, priority 0-99 should be RT scheduling which policy should be SHCED_FIFO or SCHED_RR. How can I have SCHED_NORMAL (policy = 0) and my priority is 20 (between 0-99)? Isn't this a conflict or how can I interpret these information?
scheduling priority
asked Mar 7 at 9:19
Wu Yuan Chun
11
I have a device which is running linux 2.6.36.
There is no file, "sched", in /proc/pid. So I use /proc/pid/stat to see what priority is being used.
The "stat" shows (as below) that my priority is 20 but in the meanwhile my policy is 0 as well.
[root]cat stat
3001 (asterisk) S 1 3001 3001 0 -1 4194624 3041 0 25 0 288 157 0 0 20 0 31 0 5426 33370112 2225 2147483647 4194304 6332812 2146804640 2146799784 728612916 0 0 4100 1074937859 4294967295 0 0 18 0 0 0 0 0 0
(Note: https://elixir.bootlin.com/linux/v2.6.36/source/Documentation/filesystems/proc.txt
Table 1-4: Contentxxxx in the above link shows the meaning of stat contents. The 18th and 41th items are priority and policy respectively.)
My question:
As I know, priority 0-99 should be RT scheduling which policy should be SHCED_FIFO or SCHED_RR. How can I have SCHED_NORMAL (policy = 0) and my priority is 20 (between 0-99)? Isn't this a conflict or how can I interpret these information?
scheduling priority
asked Mar 7 at 9:19
Wu Yuan Chun
11
asked Mar 7 at 9:19
Wu Yuan Chun
11
asked Mar 7 at 9:19
Wu Yuan Chun
11
asked Mar 7 at 9:19
Wu Yuan Chun
11
11
add a comment |Â
add a comment |Â
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