[RFC] why do we need run disk sync before entering S3

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Hi, all,

I did some S3 tests on an eeepc901, the total suspend time(from issue
the suspend command to power down) is about 2.5s~3s.
something interesting is that kernel runs disk sync before entering S3
state, and this takes about 0.7~1.2s.
my question is that, why do we need this for s2ram?
can we remove this and run sys_sync for S4 only?

thanks,
rui

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