Slow shutdown with big file in /dev/shm
bojan at rexursive.com
Tue Mar 20 13:19:27 UTC 2012
Adam Jackson <ajax at redhat.com> wrote:
>Presumably because that file got paged out.
>Think about it. Disabling swap doesn't know that the file exists only
>on a RAM-based file system, and even if it did, doesn't know that we're
>about to shut down. So swapoff has to assume that any pages currently
>in the swap area being disabled might be valuable, and has to read them
>back into memory.
>Now as to why we disable swap on shutdown, I'm not really sure. It
>certainly seems like useless work to me.
Would it help if all memory based file systems got unmounted before swap gets disabled? That would kill these files, right?
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