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

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Message-ID: <7040b501-6e25-42da-bda0-a15614a80d5d@gmail.com>
Date: Wed, 29 Oct 2025 11:13:30 +0800
From: Yongpeng Yang <yangyongpeng.storage@...il.com>
To: Chao Yu <chao@...nel.org>, Jaegeuk Kim <jaegeuk@...nel.org>,
 linux-kernel@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net
Cc: Yongpeng Yang <yangyongpeng@...omi.com>
Subject: Re: [f2fs-dev] [PATCH] f2fs: add fadvise tracepoint

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?

>> +		__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),
> 
> 
> 
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