Btrfs: finish read pages in the order they are submitted

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The endio is done at reverse order of bio vectors.

That means for a sequential read, the page first submitted will finish
last in a bio. Considering we will do checksum (making cache hot) for
every page, this does introduce delay (and chance to squeeze cache used
soon) for pages submitted at the begining.

I don't observe obvious performance difference with below patch at my
simple test, but seems more natural to finish read in the order they are
submitted.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

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This commit is contained in:

Chris Mason 2010-02-03 18:18:45 +00:00

parent 0be2e98173

commit 4125bf761c

1 changed files with 4 additions and 3 deletions

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fs/btrfs/extent_io.c

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