os/bluestore: allow default to buffered write #11301
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Add config option to buffered writes (in the absense of a client WILLNEED hint). Set the config option to false, though, so that the default behavior is unchanged. 2Q should do a half-decent job of preventing this from pushing actually-hot data from the cache when it's enabled, but we'll need to do more testing first. Signed-off-by: Sage Weil <sage@redhat.com>
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This adds a tunable, but doesn't change default behavior. We need to test more first.