tree 93085b8c970f6401d88499b454f39ed32f884d37
parent 48e4d181912389c95dd91449dedf5dcb886996a4
author Lucas De Marchi <lucas.demarchi@intel.com> 1413504133 -0300
committer Lucas De Marchi <lucas.demarchi@intel.com> 1413504133 -0300

strbuf: reduce default buffer size

Using 2048 as buffer sizer for strbuf is a bit exaggerated. strbuf is
used much more when we are not using mmapped indexes, but it's used for
mmapped when for example searching for an alias. A quick and dirty hack
to output the size of our strbufs is to print buf->used inside
strbuf_str(). Doing this and creating some statistics with:

while read xxx alias xxx; do
    tools/modprobe -R "$alias" > /dev/null;
done < /lib/modules/$(uname -r)/modules.alias 2>&1 | \
	     Rscript -e 'summary (as.numeric (readLines ("stdin")))'

   Min. 1st Qu.  Median    Mean 3rd Qu.    Max.    NA's
   1.00   29.00   31.00   31.55   38.00   92.00      26

So, reduce the step to 128, which is still greater than the maximum in
these cases. In the worst case this can only create a few calls to
realloc(), while keeping the memory footprint low for the common cases.