Any time you touch swap you need to consider both
overcommit_memory
AND
overcommit_ratio
no. when overcommit_memory is default, you can ignore ratio.
when it's 2, then you need to touch ratio if your /proc/meminfo:CommitLimit
is not sufficient to your needs. running in this mode is not very
predictive of whether you'll actually touch swap.
yes, it's a bit odd that limit=swap+ratio*ram,
since most people at first thought think limit=ram+ratio*swap.
incidentally, if you run in overcommit_memory=2, the primary memory
metric you should be monitoring is CommitLimit-Committed_AS
("uncommitted memory" - ie, VM available for allocation.)
(fwiw, #1 linux newbie mistake is to ever look at /proc/meminfo:MemFree)
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