Game play with non-leaking kernel top - 22:55:25 up 2:09, 5 users, load average: 0.43, 0.30, 0.17 Tasks: 167 total, 1 running, 166 sleeping, 0 stopped, 0 zombie %Cpu(s): 1.7 us, 0.5 sy, 0.0 ni, 97.8 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem: 8180116 total, 549868 used, 7630248 free, 35524 buffers KiB Swap: 2088412 total, 0 used, 2088412 free, 265772 cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 7548 dawitbro 20 0 292m 41m 12m S 9.0 0.5 1:58.77 prboom-plus 2670 root 20 0 147m 37m 10m S 0.7 0.5 0:48.46 Xorg 64 root 20 0 0 0 0 S 0.3 0.0 0:01.42 kworker/u:8 3847 root 20 0 47412 792 444 S 0.3 0.0 0:01.56 udisks-daemon [...] After a few minutes of fullscreen game play top - 16:48:36 up 2:46, 5 users, load average: 0.18, 0.18, 0.12 Tasks: 166 total, 1 running, 165 sleeping, 0 stopped, 0 zombie %Cpu(s): 1.9 us, 0.2 sy, 0.0 ni, 97.9 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem: 8180084 total, 2150544 used, 6029540 free, 21248 buffers KiB Swap: 2088412 total, 10768 used, 2077644 free, 309096 cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 7393 dawitbro 20 0 1962m 40m 11m S 9.3 0.5 1:11.24 prboom-plus 9 root 20 0 0 0 0 S 0.3 0.0 0:13.46 rcu_preempt 2339 root 20 0 156m 40m 5460 S 0.3 0.5 2:31.62 Xorg 3478 root 20 0 47412 348 0 S 0.3 0.0 0:02.04 udisks-daemon [...] After a few more minutes... top - 16:53:26 up 2:51, 5 users, load average: 0.69, 0.50, 0.28 Tasks: 165 total, 1 running, 164 sleeping, 0 stopped, 0 zombie %Cpu(s): 1.7 us, 0.5 sy, 0.0 ni, 97.5 id, 0.3 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem: 8180084 total, 3853788 used, 4326296 free, 21356 buffers KiB Swap: 2088412 total, 10768 used, 2077644 free, 587244 cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 7393 dawitbro 20 0 3554m 44m 11m S 9.3 0.6 2:17.39 prboom-plus 2339 root 20 0 156m 41m 5508 S 0.7 0.5 2:40.97 Xorg 6 root 20 0 0 0 0 S 0.3 0.0 0:10.66 kworker/u:0 1875 root 20 0 4112 244 96 S 0.3 0.0 0:02.09 acpid [...] After a few more minutes... top - 16:55:17 up 2:53, 5 users, load average: 0.50, 0.50, 0.31 Tasks: 166 total, 1 running, 165 sleeping, 0 stopped, 0 zombie %Cpu(s): 2.1 us, 0.3 sy, 0.0 ni, 97.5 id, 0.2 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem: 8180084 total, 4350448 used, 3829636 free, 21412 buffers KiB Swap: 2088412 total, 10768 used, 2077644 free, 1095800 cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 7393 dawitbro 20 0 4024m 46m 11m S 8.6 0.6 2:39.89 prboom-plus 2339 root 20 0 156m 41m 5556 S 0.7 0.5 2:44.16 Xorg 6 root 20 0 0 0 0 S 0.3 0.0 0:11.01 kworker/u:0 61 root 20 0 0 0 0 S 0.3 0.0 0:02.00 scsi_eh_6 [...] Reaped by OOM killer (dmesg output) [...] [ 1182.223571] Out of memory: Kill process 3784 (prboom-plus) score 7 or sacrifice child [ 1182.224470] Killed process 3784 (prboom-plus) total-vm:10089144kB, anon-rss:54420kB, file-rss:72kB [...] After program is terminated top - 16:55:59 up 2:54, 5 users, load average: 0.34, 0.46, 0.30 Tasks: 164 total, 1 running, 163 sleeping, 0 stopped, 0 zombie %Cpu(s): 0.1 us, 0.1 sy, 0.0 ni, 99.8 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem: 8180084 total, 560040 used, 7620044 free, 21436 buffers KiB Swap: 2088412 total, 10768 used, 2077644 free, 309296 cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 7421 root 20 0 0 0 0 S 0.3 0.0 0:00.48 kworker/0:4 1 root 20 0 10648 140 0 S 0.0 0.0 0:00.93 init 2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd 3 root 20 0 0 0 0 S 0.0 0.0 0:00.02 ksoftirqd/0 [...]