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monitoring block access to disk

I am looking for a way to monitor access to disk blocks, and to monitor the access as a bitmap of blocks. I also need the capability to freeze (and queue) the device block access (and also to ...
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Lttng tracepoint(provider,tpname, arg)

I want to insert lttng - tracepoint("traceprovider_name"tracepoint_name" "$1"$2") statements with same tracepoint_name and traceprovider_name but with different arguments: for example: 1)How to ...
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How to debug freeze at start, output of syslog

Every now and then, my computer freezes while starting. I can see some "Oops" in /var/log/syslog, but from there I am not sure what to do to try and fix the problem. Jun 5 12:47:40 fulla kernel: [ ...
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Systemtap graphical visualizer

I am using systemtap for function tracing and it generates output in normal ascii text format is there a way get trace in opentrace format(OTF)
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Unable to capture trace with -w option

I am not able to capture trace with the -w option on my fedora machine. Please see the log below : [root@localhost home]# tcpdump -w /home/trace.cap -i eth2 -s 0 tcpdump: listening on eth2, link-type ...