File:Kernel patches stats.png

Description

This graph shows how many patches from OpenVZ developers were merged into mainstream Linux kernel, per each kernel version.

It is drawn by gnuplot using the data set obtained from kernel git repository.

Source code

1. !/bin/sh

1. Whose patches to count

PAT='@openvz.org|@parallels.com|@sw.ru|@swsoft.com|@sw.com.sg|adobriyan@|kuznet@'

1. Return the date of the given tag, in a format usable by gnuplot

get_tag_date() { echo $(git show $1 | egrep ^Date: | head -n1) | sed 's/^Date: ... \(.*\) [-+]....$/\1/' | sed 's/ ..:..:..//' | sed 's/ /-/g' }

1. Count the number of patches whose authors match $PAT,
2. for the period between two given git tags

count_patches() { git log --pretty=short --no-merges $1..$2 | egrep '^Author: ' | egrep $PAT | wc -l }

1. Old 2.6 kernel branch
2. We start from 2.6.12 -- the first kernel available in git
3. and end on 2.6.39 -- the last kernel on 2.6 branch

for f in $(seq 13 39); do v1=v2.6.$((f-1)) d1=$(get_tag_date $v1) if [ $f -gt 39 ]; then v2=$HEAD else v2=v2.6.$f fi d2=$(get_tag_date $v2) count=$(count_patches $v1 $v2) if test "$count" -gt 0; then echo $d2 $v2 " " $count fi

done | sed 's/ /\t/g'

1. New 3.x kernel branch
2. Transition: patches from 2.6.39 to 3.0

d2=$(get_tag_date v3.0) count=$(count_patches v2.6.39 v3.0) echo $d2 "v3.0" " " $count | sed 's/ /\t/g'

1. What is the latest kernel patch number in 3.x

latest=$(git tag | grep -v -- -rc | tail -n1 | sed -e 's/^.*\.\(.*\)$/\1/')

1. Find out if number of patches for HEAD is much more
2. than for latest -rc. If yes, use HEAD, otherwise -rc.

last_rc=$(git tag | tail -n 1 | grep -- -rc) HEAD=$last_rc if ! test -z "$last_rc"; then much_more=15 count_head=$(count_patches v3.$latest HEAD) count_rc=$(count_patches v3.$latest $last_rc) if test $count_head -gt $((count_rc+much_more)); then HEAD="HEAD " fi fi

1. We start from 3.0

for f in $(seq 1 $((latest+1))); do v1=v3.$((f-1)) d1=$(get_tag_date $v1) if [ $f -gt $latest ]; then v2=$HEAD else v2=v3.$f fi d2=$(get_tag_date $v2) count=$(count_patches $v1 $v2) if test "$count" -gt 0; then echo $d2 $v2 " " $count fi

done | sed 's/ /\t/g'

Draw the graph

Here is the script to produce the graph. Note it calls the previous script under the name 'count'.

#!/bin/sh

if test "$1" != "-f"; then
	git checkout master
	git pull
	sh count > time.dat
fi

DATE=$(tail -n 1 time.dat | cut -f 1 | awk -F- '{print $2,$1,$3}')
MAXY=$(awk 'BEGIN {max=0}; ($3 > max) {max=$3}; END {print max+50}' < time.dat)
# GNU date is powerful!
MAXX=$(date +%b-1-%Y --date='+2 months')

export GDFONTPATH=/usr/share/fonts/msttcorefonts/
cat << EOF | gnuplot > plot.png
set terminal png enhanced font "verdanab,20" size 1600,1200
#set terminal png enhanced transparent font "verdanab,14" size 1200,600
#set terminal svg enhanced font "verdanab,8" size 800,600

set title "OpenVZ team kernel patches progress as of ${DATE}"

unset xlabel
set xdata time
set timefmt "%b-%d-%Y"
set format x "%b\n%Y"
set grid xtics mxtics noytics

set xrange [ : "${MAXX}" ]
set yrange [ 0 : ${MAXY} ]
set ylabel "Number of patches from OpenVZ team,\n per kernel release, accepted into mainstream"

set border 3		# no lines at right and top
set xtics nomirror	# no tics at top
set ytics nomirror	# no tics at right

plot 'time.dat' using 1:3 with linespoints pt 6 ps 1 lw 2 lt 2 notitle, \
	''	using 1:3:2 with labels left offset 0,1 rotate notitle, \
	''	using 1:3:3 with labels left offset 0.7,0 notitle

EOF