Hi. On Sat, Aug 25, 2018 at 09:42:31AM +0530, Subhadip Ghosh wrote: > Hi, > > I am a Debian testing user. Recently I am experiencing freezing on my Debian > system intermittently and during troubleshooting the same, I found out that > the I have a swap partition with priority set to -2.
Same here with stable. > But according to the below manpage: > > https://manpages.debian.org/stretch/mount/swapon.8.en.html > > swap priority should be between -1 and 32767. So swapon(8) utility has this restriction. Note that the system call itself - swapon(2) merely interprets swap priority as a signed integer, so any priority number is actually possible (within integer limits of course). > I have a swappiness value of 60 but I don't remember seeing the swap > being used at all recently, the used swap is always 0%. A hint. They invented this wonderful thing called sysstat decades ago so you don't have to remember your swap usage, along with other things sysstat gathers. > My question is, do you think that the -2 priority is stopping the swap > partition from actually being used and because of that, the system is > getting frozen when the memory usage is high? No, it definitely does not work this way. A swap priority only comes into play once you have multiple instances of swaps. If you have a single swap partition/lv/file, a priority value is meaningless. A system freezes, on the other hand (did I mention sysstat?), could indicate heavy swapping, barrier writes, kernel bugs (12309, anyone?), oom killer invocations, overheating and many other things. A good starting point would be kernel message log (aka /var/log/kern.log) from the time of this freeze. Reco
