linux-kernel - Re: [f2fs-dev][PATCH] f2fs: count mmap write io more accurately

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Date:   Mon, 19 Jun 2023 09:01:14 +0800
From:   Chao Yu <chao@...nel.org>
To:     Yunlei He <heyunlei@...o.com>, jaegeuk@...nel.org
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [f2fs-dev][PATCH] f2fs: count mmap write io more accurately

On 2023/6/13 14:51, Yunlei He wrote:
> This patch count mmap write io more accurately and remove
> redundant PageUptodate judgement in f2fs_vm_page_mkwrite.

Yunlei,

What about separating this patch:
- remove unneeded uptodate check/set.
- fix incorrect PageMappedToDisk check and goto logic.

Thanks,

> 
> Signed-off-by: Yunlei He <heyunlei@...o.com>
> ---
>   fs/f2fs/file.c | 4 +---
>   1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 4dd4e2bd000a..34a6177c64a4 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -149,14 +149,12 @@ static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf)
>                  zero_user_segment(page, offset, PAGE_SIZE);
>          }
>          set_page_dirty(page);
> -       if (!PageUptodate(page))
> -               SetPageUptodate(page);
> 
> +out_sem:
>          f2fs_update_iostat(sbi, inode, APP_MAPPED_IO, F2FS_BLKSIZE);
>          f2fs_update_time(sbi, REQ_TIME);
> 
>          trace_f2fs_vm_page_mkwrite(page, DATA);
> -out_sem:
>          filemap_invalidate_unlock_shared(inode->i_mapping);
> 
>          sb_end_pagefault(inode->i_sb);
> --