btrfs: move eb subpage preallocation out of the loop

Browse source

Initially we preallocate btrfs_subpage structure in the main loop of
alloc_extent_buffer().

But later commit fbca46eb46 ("btrfs: make nodesize >= PAGE_SIZE case
to reuse the non-subpage routine") has made sure we only go subpage
routine if our nodesize is smaller than PAGE_SIZE.

This means for that case, we only need to allocate the subpage structure
once anyway.

So this patch would make the preallocation out of the main loop.  This
would slightly reduce the workload when we hold the page lock, and make
code a little easier to read.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

...

This commit is contained in:

Qu Wenruo 2023-07-09 15:08:18 +08:00 • committed by David Sterba

parent b2cc440058

commit 52ea5bfbfa

1 changed files with 18 additions and 23 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

41

fs/btrfs/extent_io.c

View file