btrfs: run delayed refs less often in commit_cowonly_roots

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We love running delayed refs in commit_cowonly_roots, but it is a bit
excessive.  I was seeing cases of running 3 or 4 refs a few times in a
row during this time.  Instead simply:

- update all of the roots first
- then run delayed refs
- then handle the empty block groups case
- and then if we have any more dirty roots do the whole thing again

This allows us to be much more efficient with our delayed ref running,
as we can batch a few more operations at once.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Josef Bacik 2020-12-18 14:24:26 -05:00 • committed by David Sterba

parent dac348e925

commit 488bc2a2d2

1 changed files with 12 additions and 11 deletions

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fs/btrfs/transaction.c

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