linux-kernel - Re: [PATCH v2] f2fs: use kmem_cache pool during inline xattr lookups

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Date:   Wed, 18 Mar 2020 21:14:04 +0900
From:   Ju Hyung Park <qkrwngud825@...il.com>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     Jaegeuk Kim <jaegeuk@...nel.org>,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, Chao Yu <chao@...nel.org>
Subject: Re: [PATCH v2] f2fs: use kmem_cache pool during inline xattr lookups

Hi Chao.

I got the time around to test this patch.
The v2 patch seems to work just fine, and the code looks good.

On Tue, Feb 25, 2020 at 7:17 PM Chao Yu <yuchao0@...wei.com> wrote:
> diff --git a/fs/f2fs/xattr.c b/fs/f2fs/xattr.c
> index a3360a97e624..e46a10eb0e42 100644
> --- a/fs/f2fs/xattr.c
> +++ b/fs/f2fs/xattr.c
> @@ -23,6 +23,25 @@
>  #include "xattr.h"
>  #include "segment.h"
>
> +static void *xattr_alloc(struct f2fs_sb_info *sbi, int size, bool *is_inline)
> +{
> +       *is_inline = (size == sbi->inline_xattr_slab_size);

Would it be meaningless to change this to the following code?
if (likely(size == sbi->inline_xattr_slab_size))
    *is_inline = true;
else
    *is_inline = false;

The above statement seems to be only false during the initial mount
and the rest(millions) seems to be always true.

Thanks.