Build rpm example:zram

rpmbuild

#ll zram-1.0.0
total 32
-rw-r--r-- 1 root root  948 Aug 21 16:44 Makefile
-rw-r--r-- 1 root root  221 Aug 21 16:44 mkzram.service
-rw-r--r-- 1 root root 2633 Aug 21 16:44 README.md
-rw-r--r-- 1 root root  395 Aug 23 11:29 zram
-rw-r--r-- 1 root root 1780 Aug 21 16:44 zram.spec
-rwxr-xr-x 1 root root  988 Aug 22 11:17 zramstart
-rwxr-xr-x 1 root root  931 Aug 22 12:32 zramstat
-rwxr-xr-x 1 root root  162 Aug 21 16:44 zramstop

#ls
zram-1.0.0

#tar -czf zram-1.0.0.tar.gz zram-1.0.0

#cp zram-1.0.0.tar.gz /root/rpmbuild/SOURCES/

#cp zram-1.0.0/zram.spec /root/rpmbuild/SPECS/zram.spec

#rpmbuild -ba  /root/rpmbuild/SPECS/zram.spec

文件准备

/usr/lib/systemd/system/mkzram.service
[Unit]
Description=Enable compressed swap in memory using zram
After=multi-user.target

[Service]
RemainAfterExit=yes
ExecStart=/usr/sbin/zramstart
ExecStop=/usr/sbin/zramstop
Type=oneshot

[Install]
WantedBy=swap.target

#cat /usr/sbin/zramstart
#!/bin/sh

#$(nproc) get cpu core number
num_cpus=$(nproc)
[ "$num_cpus" != 0 ] || num_cpus=1

#memory percentage,If have mem:100G cpu:24, default value per disksize=33G/24
MEM_FACTOR_PERCENT=33
num_device=$num_cpus
if [[ -f /etc/sysconfig/zram ]];then
	source /etc/sysconfig/zram
	if [[ -n $MEM_FACTOR_PERCENT ]];then
		mem_percentage=$MEM_FACTOR_PERCENT # memory percentage
	fi
	if [[ -n $DEVICE_NUM ]];then
		num_device=$DEVICE_NUM  #device number
	fi
fi

memtotal=$(grep MemTotal /proc/meminfo | awk ' { print $2 } ')
mem_per_device=$(($memtotal/${num_device}*${mem_percentage}/100*1024))

modprobe -q zram num_devices=${num_device}
last_num=$(($num_device - 1))

for i in $(seq 0 $last_num); do
	#enable lz4 if that supported
	if [[ -e "/sys/block/zram$i/comp_algorithm" ]];then
		grep -q lz4 /sys/block/zram$i/comp_algorithm && echo lz4 > /sys/block/zram$i/comp_algorithm
	fi
	echo $mem_per_device > /sys/block/zram$i/disksize

	mkswap /dev/zram$i
	swapon -p 100 /dev/zram$i
done

#cat /usr/sbin/zramstat
#!/bin/sh

ls /sys/block/zram* > /dev/null 2>&1 || exit 0

for i in /sys/block/zram*; do
	each_zram=`echo ${i##*/}`
	compr=$(< $i/compr_data_size)
	orig=$(< $i/orig_data_size)
	ratio=0
	if [ $compr -gt 0 ]; then
		ratio=$(echo "scale=2; $orig/$compr" | bc -q)
		#ratio=$(echo "scale=2; $compr/$orig*100" | bc -q)
	fi
	orig_human_MB=`scale=2;echo "$orig/1024/1024" | bc`
	compr_human_MB=`scale=2;echo "$compr/1024/1024" | bc`

	swap_size=`cat /proc/swaps | grep -w "${each_zram}"	| awk '{print $3}'`
	swap_used=`cat /proc/swaps | grep -w "${each_zram}"	| awk '{print $4}'`
	swap_ratio=$(printf "%.2f" `echo "scale=2;${swap_used}/${swap_size}*100"|bc`)

	#echo -e "/dev/${i/*\/}:\t${ratio}% (${orig} bytes (${orig_human_MB} MB) -> ${compr} bytes (${compr_human_MB} MB))"
	echo -e "/dev/${i/*\/}:\tswap_used:${swap_ratio}% compress_ratio:${ratio}:1 (${orig} bytes (${orig_human_MB} MB) -> ${compr} bytes (${compr_human_MB} MB))"
done

#cat /usr/sbin/zramstop
#!/bin/sh

for i in $(grep '^/dev/zram' /proc/swaps | awk '{ print $1 }'); do
	swapoff "$i"
done

if grep -q "^zram " /proc/modules; then
	sleep 1
	rmmod zram
fi

#cat /etc/sysconfig/zram
# The factor is how much (from 0 to 100, percentage)
# of system RAM to allocate to ZRAM block devices
# Too big, and your system will start killing off processes
# If total_mem=100G, MEM_FACTOR_PERCENT=33, /dev/zram0+/dev/zram1+... = 33G ,default value is 33%
MEM_FACTOR_PERCENT=33

#Define /dev/zramxx number,if you do not define , default DEVICE_NUM value equal cpu core number
#DEVICE_NUM=1

spec文件准备

#cat zram.spec
Summary: Enable compressed swap in memory
Name: zram
Version: 1.0.0
Release: 2%{?dist}
License: GPLv2
Group: System Environment/Daemons
Source0: %{name}-%{version}.tar.gz
BuildArch: noarch

BuildRequires: systemd-units
Requires(post): systemd-sysv
Requires(post): systemd-units
Requires(preun): systemd-units
Requires(postun): systemd-units
Requires: filesystem >= 2.0.1, initscripts, bc > 1.0
# No debug info for bare scripts, right?
%define debug_package %{nil}
# http://fedoraproject.org/wiki/Changes/UnversionedDocdirs
%{!?_pkgdocdir: %global _pkgdocdir %{_docdir}/%{name}-%{version}}
%global _docdir_fmt %{name}

%description
zram compresses swap partitions into RAM for performance.

You need Linux kernel version 2.6.37.1 or better to use zram.

%prep
%setup -q

%build

%install
mkdir -p $RPM_BUILD_ROOT%{_sysconfdir}/sysconfig
mkdir -p $RPM_BUILD_ROOT%{_unitdir}
ln -s $RPM_BUILD_ROOT/usr/lib $RPM_BUILD_ROOT/lib
mkdir -p $RPM_BUILD_ROOT%{_sbindir}
%makeinstall DESTDIR=$RPM_BUILD_ROOT

%post
%systemd_post mkzram.service

%preun
%systemd_preun mkzram.service

%postun
%systemd_postun_with_restart mkzram.service

%files
%doc README.md
%config(noreplace) %{_sysconfdir}/sysconfig/%{name}
%{_unitdir}/mkzram.service
%{_sbindir}/zramstart
%{_sbindir}/zramstop
%{_sbindir}/zramstat
%exclude /lib

%changelog
* Tue Nov 25 2014 Juan Orti <jorti@fedoraproject.org> - 1.0.0-1
- Spec file cleanup

* Mon Nov 25 2013 Doncho Gunchev <dgunchev@gmail.com> - 0:1.0.0-2
- http://fedoraproject.org/wiki/Changes/UnversionedDocdirs
- Added kmod-staging dependency
- Test on Fedora 19

* Mon Sep 02 2013 Doncho Gunchev <dgunchev@gmail.com> - 0:1.0.0-1
- Add Darren Steven's build fix for fedora 18

* Tue Mar 19 2013 Doncho Gunchev <dgunchev@gmail.com> - 0:1.0.0-0
- Initial package