btrfs: send: lower memory requirements in common case

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The fs_path structure uses an inline buffer and falls back to a chain of
allocations, but vmalloc is not necessary because PATH_MAX fits into
PAGE_SIZE.

The size of fs_path has been reduced to 256 bytes from PAGE_SIZE,
usually 4k. Experimental measurements show that most paths on a single
filesystem do not exceed 200 bytes, and these get stored into the inline
buffer directly, which is now 230 bytes. Longer paths are kmalloced when
needed.

Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fb.com>

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David Sterba 2014-02-05 16:17:34 +01:00 • committed by Josef Bacik

parent dff6d0adbe

commit ace0105076

1 changed files with 37 additions and 69 deletions

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fs/btrfs/send.c

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