[Pvfs2-developers] patches: karma

[Phil Carns]

perf-mon.patch:
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This fixes two bugs in the performance monitoring path.  This isn't 
specific to karma, but karma is the tool most affected.  There was a bug 
in how the timestamps were filled into the response structure, which 
probably showed up mainly when multiple timesteps are requested.  In 
addition, the metdata counts were supposed to be cumulative, but they 
had been set to restart at zero on each interval.

karma1.patch:
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This fixes a karma bug in how it tracks metadata counts.  It wasn't 
properly tracking the previous values from each iteration to compute the 
difference (since the values are cumulative).

karma2.patch:
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This is a trivial patch to make sure karma complains if you pass it 
command line arguments (since none are supported).  This is mainly to 
make sure no one does a "-m /mnt/pvfs2-foo" to specify a particular file 
system, which may appear to work at first.

karma3.patch:
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This is a code reformatting patch.  Sorry its in the middle of the 
series rather than the end (found some other items later).  It not only 
adjusts the code format, but also adds proper copyright headers and 
editor directives.

karma4.patch:
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This is a somewhat odd patch, but it adds a new configure script 
argument called "--disable-karma-mem-usage-stats".  This option will 
cause karma to _not_ display the column that shows memory usage on each 
server.  The reason for this is that (depending on who you deploy this 
program for) this statistic can be confusing.  It doesn't differentiate 
between memory truly in use, and available memory that is temporarily in 
use by the buffer cache.  At first glance the servers just look like 
they are almost out of memory at all times.  I originally wanted to just 
make the display show available memory taking buffer cache into account, 
but I couldn't find any clean way to do it (would require /proc file 
parsing).  So this just cuts the display out for people who might be 
concerned about this.

karma5.patch:
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This fixes a variety of error handling cases in karma (if a server is 
not responding, or does not match protocol version, for example):
- clean up error messages (displayed in bottom pane)
- include host names when possible
- handle error codes that don't generage EDETAIL type output
- stop statistics gathering on certain types of errors (and display a 
message warning that restarting karma will be necessary to resume).

-Phil


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