Re: 2.6.5-rc2-mm1 - swapoff dies with OOM, why?

From: Hugh Dickins
Date: Mon Mar 29 2004 - 11:22:51 EST

On Mon, 29 Mar 2004, John Stoffel wrote:
> I'm still wondering why swapoff dies though. Shouldn't it complete,
> or at least have some way *to* complete if needed? I realize, with a
> memory leak in the filesystem, it's a hard thing to deal with.

If there's not enough freeable memory for what's out on swap, swapoff
cannot very well complete. Either it can hang while other processes
get killed by the OOM killer once swapoff has filled memory (as 2.4),
until there's enough memory free to take in what's still needed from
swap; or the OOM killer can kill it off (as 2.6). I much prefer the
2.6 behaviour - unlike many processes, swapoff can safely be restarted.
So the admin can then choose what else to kill, or add replacement
swap, then try the original swapoff again.


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