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Bug
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Resolution: Unresolved
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Undefined
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rhel-9.6
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Yes
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Low
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1
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rhel-jotnar
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0
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False
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False
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None
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Red Hat Enterprise Linux
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BaseUtilsC Sprint CY25_01
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None
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None
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Unspecified
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Unspecified
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Unspecified
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None
This is a continuation of RHEL-105319.
While on RHEL8 less polls the file every 1 second, on RHEL9 less starts spinning on the CPU, trying to read on the closed tty:
... 13:15:16.715226 read(3</dev/pts/1>(deleted), "", 1) = 0 <0.000013> 13:15:16.715271 read(3</dev/pts/1>(deleted), "", 1) = 0 <0.000013> 13:15:16.715317 read(3</dev/pts/1>(deleted), "", 1) = 0 <0.000013> 13:15:16.715363 read(3</dev/pts/1>(deleted), "", 1) = 0 <0.000014> 13:15:16.715409 read(3</dev/pts/1>(deleted), "", 1) = 0 <0.000013> 13:15:16.715453 read(3</dev/pts/1>(deleted), "", 1) = 0 <0.000013> 13:15:16.715504 read(3</dev/pts/1>(deleted), "", 1) = 0 <0.000013> 13:15:16.715549 read(3</dev/pts/1>(deleted), "", 1) = 0 <0.000013> 13:15:16.715599 read(3</dev/pts/1>(deleted), "", 1) = 0 <0.000020> 13:15:16.715651 read(3</dev/pts/1>(deleted), "", 1) = 0 <0.000013> 13:15:16.715696 read(3</dev/pts/1>(deleted), "", 1) = 0 <0.000013> 13:15:16.715746 read(3</dev/pts/1>(deleted), "", 1) = 0 <0.000013> 13:15:16.715792 read(3</dev/pts/1>(deleted), "", 1) = 0 <0.000014> ...
Additional note
There is a second "regression": when hitting "F" to follow, less on RHEL9 takes a lot more CPU than on RHEL8, because it polls the file every 2ms, instead of 1s.
IMHO the code should be reimplemented to rely on inotify instead of polling, similar to what tail -f does.
- is related to
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- Closed
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