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For a raspberrypi image, mainly there are two partitions, kernel and rootfs.  The size of kernel image size is 6M48M.  Rootfs is mounted on  SD card and its value can be increased using gparted,fdisk or similar tool.  By default while flashing an  image to SD card, two partitions are created, namely mmcblk0p1 and mmcblk0p2. rootfs image is stored in mmcblk0p2 whereas mmcblk0p1 holds boot information.

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ComponentSize
Kernel code9216K
RW data737K
RO data2928K
init1024K
BSS853K
vmalloc1097K
cma  total262K
KernelStack2536 kB
Shmem14596 kB
tmpfs95876k
devtmpfs347800k


Changing tmpfs partition size

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The size of these partitions can be changed by changed by mentioning size in /etc/fstab.  For example, we reduce size of /run to ~100M by mentioning size as below. 

root@raspberrypi-rdk-hybrid:~# vi /etc/fstab
# stock fstab - you probably want to override this with a machine specific one

/dev/root            /                            auto       defaults              1  0
proc                     /proc                   proc         defaults              0  0
devpts               /dev/pts             devpts     mode=0620,ptmxmode=0666,gid=5      0  0
tmpfs                /run                       tmpfs      mode=0755,nodev,nosuid,strictatime,size=103741824 0  0
tmpfs                /var/volatile        tmpfs      defaults              0  0

# uncomment this if your device has a SD/MMC/Transflash slot
#/dev/mmcblk0p1       /media/card          auto       defaults,sync,noauto  0  0

/dev/mmcblk0p1    /boot    vfat    defaults    0    0

The changed size can be verified using df command.  The above change results in

root@raspberrypi-rdk-hybrid:~# df -h
Filesystem                            Size      Used          Available Use%   Mounted on
/dev/root                           865.5M    557.0M    247.0M       69%     /
devtmpfs                           339.6M         0          339.6M       0%       /dev
tmpfs                                  468.1M      8.0K      468.1M       0%      /dev/shm
tmpfs                                 98.9M      8.8M        90.2M         9%       /run
tmpfs                                468.1M         0          468.1M       0%      /sys/fs/cgroup
tmpfs                                468.1M      6.6M      461.5M      1%     /tmp
tmpfs                                468.1M      6.6M      461.5M      1%      /etc/snmp/snmpd.conf
tmpfs                                468.1M    428.0K    467.7M      0%      /var/volatile
/dev/root                        865.5M    557.0M    247.0M      69%   /var/lib
/dev/mmcblk0p1           48.5M     27.4M       21.0M       57%   /boot
tmpfs                               93.6M         0            93.6M         0%   /run/user/0