Btrfs: use percpu counter for fs_info->delalloc_bytes

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fs_info->delalloc_bytes is accessed very frequently, so use percpu
counter instead of the u64 variant for it to reduce the lock
contention.

This patch also fixed the problem that we access the variant
without the lock protection.At worst, we would not flush the
delalloc inodes, and just return ENOSPC error when we still have
some free space in the fs.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>

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Miao Xie 2013-01-29 10:10:51 +00:00 • committed by Josef Bacik

parent e2d845211e

commit 963d678b0f

4 changed files with 26 additions and 11 deletions

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7

fs/btrfs/ctree.h

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18

fs/btrfs/disk-io.c

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6

fs/btrfs/extent-tree.c

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6

fs/btrfs/inode.c

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