2012/8/24 Ralf Rösch <rtlinux@xxxxxxxxxxxxx>: > Hi, > > we work on our TX4938 (Toshiba Mips, little endian mode) based embedded > system (motion control) > running successfully a 3.2 RT patched kernel for month now. > > I just give a try to a 3.4 RT patched kernel and detected a memory problem > as you can see from the logs below: > > 3.2 with RT FULL PREEMPT is o.k > 3.4 without RT FULL PREEMPT is .ok. > 3.4 with RT FULL PREEMPT is not o.k. > > Can anyone give me hint in which direction I could go to detect the problem > or has anyone else the same problem? > > Thanks and regards > Ralf > > > Linux MCU 3.2.27-rt40-00027-g8fd8396 #36 PREEMPT RT Mon Aug 20 16:21:04 CEST > 2012 mips GNU/Linux > [root@MCU:/opt]# watch -n 1 cat /proc/meminfo | grep MemFree > MemFree: 216992 kB > MemFree: 216992 kB > MemFree: 216944 kB > MemFree: 216992 kB > MemFree: 216992 kB > MemFree: 216992 kB > MemFree: 216992 kB > > uname -a > Linux MCU 3.4.9-rt17-11244-gb12622a #23 PREEMPT RT Fri Aug 24 12:15:49 CEST > 2012 mips GNU/Linux > [root@MCU:/opt]# watch -n 1 cat /proc/meminfo | grep MemFree > MemFree: 204304 kB > MemFree: 204208 kB > MemFree: 204112 kB > MemFree: 204064 kB > MemFree: 203968 kB > MemFree: 203920 kB > MemFree: 203824 kB > MemFree: 203776 kB > > uname -a > Linux MCU 3.4.9-rt17-11244-gb12622a #24 PREEMPT Fri Aug 24 14:15:04 CEST > 2012 mips GNU/Linux > [root@MCU:/opt]# watch -n 1 cat /proc/meminfo | grep MemFree > MemFree: 222240 kB > MemFree: 222192 kB > MemFree: 222192 kB > MemFree: 222192 kB > MemFree: 222144 kB > MemFree: 222144 kB > MemFree: 222192 kB > MemFree: 222144 kB > MemFree: 222192 kB > MemFree: 222144 kB You have a big leak (around 100kB/sec), yes, but can you give us more details ? What kind of application ? Network ? video encoder ? Which drivers are you using ? Did you try using some advanced tools in order to check that your application cannot have a memory leak in a specific use case (race condition ?) ? You will need to be more precise on the memory leak detection, because with what you gave, I (maybe others can) cannot help you more... Regards, JM -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
