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    SubjectRe: [PATCHSET v3.1 0/7] data integrity: Stabilize pages during writeback for various fses
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    Jan Kara <jack@suse.cz> writes:

    >> Did you already consider, to copy only if page was writeback (like
    >> copy-on-write)? I.e. if page is on I/O, copy, then switch the page for
    >> writing new data.
    > Yes, that was considered as well. We'd have to essentially migrate the
    > page that is under writeback and should be written to. You are going to pay
    > the cost of page allocation, copy, increased memory & cache pressure.
    > Depending on your backing storage and workload this may or may not be better
    > than waiting for IO...

    Maybe possible, but you really think on usual case just blocking is
    better?

    Thanks.
    --
    OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>


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