swap or memory leak on recent master?
y0n3t4n1 at gmail.com
Tue Jul 19 22:49:18 PDT 2011
On Tue, Jul 12, 2011 at 08:35:04PM -0700, Matthew Dillon wrote:
> Well, the kernel memory allocator itself doesn't use swap, so it is
> more likely a runaway user program (?) and not the kernel. If tmpfs
> is being used it could be something filling up the tmpfs mount, including
> possibly a process with a descriptor open on an unlinked file. That's
> all I can think of.
I don't think this was the case, because I could go to single user mode
without a problem, and I could umount /tmp.
> Under normal operation idle processes will eventually wind up getting
> paged out since there is no sense tying up ram to hold them. e.g.
> things like getty and such, but these normally do not amount to very
> much use.
This is rather subjective, but on a `good' kernel, the swap usage in
top's output stays something like this (it has 4Gbytes of physical memory)
Swap: 8192M Total, 32M Used, 8192M Free
where as on a `bad' kernel,
Swap: 8192M Total, 514M Used, 7678M Free, 6% Inuse
This looks odd to me, as I've never needed this much swap space even
when I was using 6 jails for pbulk. I'm not using jails now.
The last known `good' kernel was built from source as of 1e7aaef,
but bisecting cannot be automatic because the later kernels are
a bit unstable (e.g., sometimes a process locks in objde1 or objde2
and pbulk stalls waiting for it).
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