This is tested on i386 with linux 2.6.
busybox-logread-dash-n.patch [^] (1,703 bytes) 01-06-06 12:45 
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| ID | Category | Severity | Reproducibility | Date Submitted | Last Update | ||||
| 0000627 | [BusyBox] New Features | feature | always | 01-06-06 12:45 | 02-18-08 16:51 | ||||
| Reporter | akvadrako | View Status | public | ||||||
| Assigned To | BusyBox | ||||||||
| Priority | normal | Resolution | won't fix | ||||||
| Status | closed | Product Version | svn | ||||||
| Summary | 0000627: new logread option: -n (like tail) | ||||||||
| Description |
This patch adds an option to logread to only display the latest certain # of lines. This is very useful since there is no logfile to run tail on and the entire ring buffer must be copied for tail to work. On my system (10MB logfile, 128MB memory) this really isn't practical. This is tested on i386 with linux 2.6. |
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| Additional Information | |||||||||
| Attached Files |
busybox-logread-dash-n.patch [^] (1,703 bytes) 01-06-06 12:45 |
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Notes |
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(0000977) landley 01-22-06 16:36 |
What's wrong with logread | tail -n ? |
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(0000978) akvadrako 01-22-06 17:13 |
Well, I clearly expalin that in my description. Tail has no way to display the last lines of a stream because it has no way to know when the stream will end. So instead it has to copy the entire input into memory buffer and then display the last few lines. This takes too much memory. |
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(0001675) vda 09-30-06 14:21 |
Is our tail THAT stupid? tail has to remember only last N lines (when it reads next line, it can forget oldest line in buffer). The other thing, I really dislike syslogd. Not the code, the concept. Keeping log in shmem... isn't it silly? shmem in Linux is just a hidden tmpfs after all, why not use the filesystem explicitly (with log rotation)? That way no one will need logread AT ALL. |
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(0005114) vda 02-18-08 16:51 |
"logread | tail -n" should work. Our tail is not eating all input upfront, it will efficiently read it in small bits. Alternatively, making syslog dump log into ordinary files (on tmpfs if you have no writable storage) with log rotation will allow you to use tail on these files. |
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Issue History |
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| Date Modified | Username | Field | Change |
| 01-06-06 12:45 | akvadrako | New Issue | |
| 01-06-06 12:45 | akvadrako | Status | new => assigned |
| 01-06-06 12:45 | akvadrako | Assigned To | => BusyBox |
| 01-06-06 12:45 | akvadrako | File Added: busybox-logread-dash-n.patch | |
| 01-22-06 16:36 | landley | Note Added: 0000977 | |
| 01-22-06 17:13 | akvadrako | Note Added: 0000978 | |
| 09-30-06 14:21 | vda | Note Added: 0001675 | |
| 02-18-08 16:51 | vda | Status | assigned => closed |
| 02-18-08 16:51 | vda | Note Added: 0005114 | |
| 02-18-08 16:51 | vda | Resolution | open => won't fix |
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