linux-kernel - Re: [PATCH v2 3/3] ext4: add needed paramter to ext4_mb_discard

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Date:   Wed, 5 Aug 2020 16:51:34 +0800
From:   brookxu <brookxu.cn@...il.com>
To:     Andreas Dilger <adilger@...ger.ca>
Cc:     Theodore Ts'o <tytso@....edu>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] ext4: add needed paramter to
 ext4_mb_discard_preallocations trace

Thanks, this is a good suggestion, and I will merged this patch with the previous patch.

Thanks

Andreas Dilger wrote on 2020/8/5 12:54:
> On Aug 4, 2020, at 7:02 PM, brookxu <brookxu.cn@...il.com> wrote:
>> Add the needed value to ext4_mb_discard_preallocations trace, so
>> we can more easily observe the requested number of trim.
>>
>> Signed-off-by: Chunguang Xu <brookxu@...cent.com>
> IMHO, this should be part of the previous patch that is changing the
> API for ext4_discard_preallocations().
>
> Cheers, Andreas
>
>> ---
>>  include/trace/events/ext4.h | 14 ++++++++------
>>  1 file changed, 8 insertions(+), 6 deletions(-)
>>
>> diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h
>> index cc41d69..61736d8 100644
>> --- a/include/trace/events/ext4.h
>> +++ b/include/trace/events/ext4.h
>> @@ -746,24 +746,26 @@
>>  );
>>
>>  TRACE_EVENT(ext4_discard_preallocations,
>> -    TP_PROTO(struct inode *inode),
>> +    TP_PROTO(struct inode *inode, unsigned int needed),
>>
>> -    TP_ARGS(inode),
>> +    TP_ARGS(inode, needed),
>>
>>      TP_STRUCT__entry(
>> -        __field(    dev_t,    dev            )
>> -        __field(    ino_t,    ino            )
>> +        __field(    dev_t,        dev        )
>> +        __field(    ino_t,        ino        )
>> +        __field(    unsigned int,    needed        )
>>
>>      ),
>>
>>      TP_fast_assign(
>>          __entry->dev    = inode->i_sb->s_dev;
>>          __entry->ino    = inode->i_ino;
>> +        __entry->needed    = needed;
>>      ),
>>
>> -    TP_printk("dev %d,%d ino %lu",
>> +    TP_printk("dev %d,%d ino %lu needed %u",
>>            MAJOR(__entry->dev), MINOR(__entry->dev),
>> -          (unsigned long) __entry->ino)
>> +          (unsigned long) __entry->ino, __entry->needed)
>>  );
>>
>>  TRACE_EVENT(ext4_mb_discard_preallocations,
>>
>> --
>> 1.8.3.1
>>
>
> Cheers, Andreas
>
>
>
>
>