[PATCH] D27295: Remove existing file in a separate thread asynchronously.

[Rafael Avila de Espindola via llvm-commits]

Rui Ueyama <ruiu at google.com> writes:

> Renaming onto an existing file may be different than renaming to a fresh
> nonexistent name because in the former case kernel needs to (atomically)
> remove the old file.

Yes, it looks like the cost shows up when the last reference to a file goes
away, since the call only returns once the data is freed.

It would still be interesting to benchmark things like open(), unlink()
/*should be fast*/, close(). Maybe the close is fast. Maybe just the
close needs to be in another thread.

Also, windows does async delete, so it should not need the thread.

Cheers,
Rafael