linux-kernel - Re: [f2fs-dev] [PATCH] f2fs: add fadvise tracepoint

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Message-ID: <490569af-8e87-4cea-81dc-3bc9f59aa2b4@kernel.org>
Date: Wed, 29 Oct 2025 11:41:27 +0800
From: Chao Yu <chao@...nel.org>
To: Yongpeng Yang <yangyongpeng.storage@...il.com>,
 Jaegeuk Kim <jaegeuk@...nel.org>, linux-kernel@...r.kernel.org,
 linux-f2fs-devel@...ts.sourceforge.net
Cc: chao@...nel.org, Yongpeng Yang <yangyongpeng@...omi.com>
Subject: Re: [f2fs-dev] [PATCH] f2fs: add fadvise tracepoint

On 10/29/25 11:13, Yongpeng Yang wrote:
> On 10/29/25 10:06, Chao Yu via Linux-f2fs-devel wrote:
>> On 10/29/25 03:54, Jaegeuk Kim via Linux-f2fs-devel wrote:
>>> This adds a tracepoint in the fadvise call path.
>>>
>>> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
>>> ---
>>>   fs/f2fs/file.c              |  2 ++
>>>   include/trace/events/f2fs.h | 32 ++++++++++++++++++++++++++++++++
>>>   2 files changed, 34 insertions(+)
>>>
>>> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
>>> index 6d42e2d28861..4a81089c5df3 100644
>>> --- a/fs/f2fs/file.c
>>> +++ b/fs/f2fs/file.c
>>> @@ -5288,6 +5288,8 @@ static int f2fs_file_fadvise(struct file *filp, loff_t offset, loff_t len,
>>>       struct inode *inode = file_inode(filp);
>>>       int err;
>>>   +    trace_f2fs_fadvise(inode, offset, len, advice);
>>> +
>>>       if (advice == POSIX_FADV_SEQUENTIAL) {
>>>           if (S_ISFIFO(inode->i_mode))
>>>               return -ESPIPE;
>>> diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
>>> index edbbd869078f..b7f5317b5980 100644
>>> --- a/include/trace/events/f2fs.h
>>> +++ b/include/trace/events/f2fs.h
>>> @@ -586,6 +586,38 @@ TRACE_EVENT(f2fs_file_write_iter,
>>>           __entry->ret)
>>>   );
>>>   +TRACE_EVENT(f2fs_fadvise,
>>> +
>>> +    TP_PROTO(struct inode *inode, loff_t offset, loff_t len, int advice),
>>> +
>>> +    TP_ARGS(inode, offset, len, advice),
>>> +
>>> +    TP_STRUCT__entry(
>>> +        __field(dev_t,    dev)
>>> +        __field(ino_t,    ino)
>>> +        __field(loff_t, size)
>>> +        __field(loff_t,    offset)
>>> +        __field(loff_t,    len)
>>> +        __field(int,    advice)
>>> +    ),
>>> +
>>> +    TP_fast_assign(
>>> +        __entry->dev    = inode->i_sb->s_dev;
>>> +        __entry->ino    = inode->i_ino;
>>> +        __entry->size    = inode->i_size;
>>
>> __entry->size = i_size_read(inode)?
>>
>> Thanks,
>>
> The other "__entry->size = inode->i_size;" in include/trace/events/f2fs.h also need to be updated?

Yeah, Yongpeng, I noticed that and fixed them right after reply:

https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git/commit/?h=bugfix/common&id=ffd21bf791143957f6ff1fc14d7dbd6e8466b320

Thanks for your reminder. :)

Thanks,

> 
>>> +        __entry->offset    = offset;
>>> +        __entry->len    = len;
>>> +        __entry->advice    = advice;
>>> +    ),
>>> +
>>> +    TP_printk("dev = (%d,%d), ino = %lu, i_size = %lld offset:%llu, len:%llu, advise:%d",
>>> +        show_dev_ino(__entry),
>>> +        (unsigned long long)__entry->size,
>>> +        __entry->offset,
>>> +        __entry->len,
>>> +        __entry->advice)
>>> +);
>>> +
>>>   TRACE_EVENT(f2fs_map_blocks,
>>>       TP_PROTO(struct inode *inode, struct f2fs_map_blocks *map, int flag,
>>>            int ret),
>>
>>
>>
>> _______________________________________________
>> Linux-f2fs-devel mailing list
>> Linux-f2fs-devel@...ts.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
>