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SubjectRe: [PATCH 2/3] f2fs: trace checkpoint reason in fsync()
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On 2017/11/6 8:55, Jaegeuk Kim wrote:
> On 11/05, Chao Yu wrote:
>> From: Chao Yu <yuchao0@huawei.com>
>>
>> This patch slightly changes need_do_checkpoint to return the detail
>> info that indicates why we need do checkpoint, then caller could print
>> it with trace message.
>>
>> Signed-off-by: Chao Yu <yuchao0@huawei.com>
>> ---
>> fs/f2fs/file.c | 34 ++++++++++++++++++----------------
>> include/trace/events/f2fs.h | 12 ++++++------
>> 2 files changed, 24 insertions(+), 22 deletions(-)
>>
>> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
>> index cee0f36ba9a1..d9d8b1c372f8 100644
>> --- a/fs/f2fs/file.c
>> +++ b/fs/f2fs/file.c
>> @@ -141,27 +141,29 @@ static int get_parent_ino(struct inode *inode, nid_t *pino)
>> return 1;
>> }
>>
>> -static inline bool need_do_checkpoint(struct inode *inode)
>> +static inline int need_do_checkpoint(struct inode *inode)
>> {
>> struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
>> - bool need_cp = false;
>> + int cp_reason = 0;
>>
>> - if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1)
>> - need_cp = true;
>> + if (!S_ISREG(inode->i_mode))
>> + cp_reason = 1;
>> + else if (inode->i_nlink != 1)
>> + cp_reason = 2;
>> else if (is_sbi_flag_set(sbi, SBI_NEED_CP))
>> - need_cp = true;
>> + cp_reason = 3;
>> else if (file_wrong_pino(inode))
>> - need_cp = true;
>> + cp_reason = 4;
>> else if (!space_for_roll_forward(sbi))
>> - need_cp = true;
>> + cp_reason = 5;
>> else if (!is_checkpointed_node(sbi, F2FS_I(inode)->i_pino))
>> - need_cp = true;
>> + cp_reason = 6;
>> else if (test_opt(sbi, FASTBOOT))
>> - need_cp = true;
>> + cp_reason = 7;
>> else if (sbi->active_logs == 2)
>> - need_cp = true;
>> + cp_reason = 8;
>
> We need to make the numbers by enum so that we could interpret them in tracepoint
> below.

Agreed, could you check v2? :)

Thanks,

>
> Thanks,
>
>>
>> - return need_cp;
>> + return cp_reason;
>> }
>>
>> static bool need_inode_page_update(struct f2fs_sb_info *sbi, nid_t ino)
>> @@ -196,7 +198,7 @@ static int f2fs_do_sync_file(struct file *file, loff_t start, loff_t end,
>> struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
>> nid_t ino = inode->i_ino;
>> int ret = 0;
>> - bool need_cp = false;
>> + bool cp_reason = 0;
>> struct writeback_control wbc = {
>> .sync_mode = WB_SYNC_ALL,
>> .nr_to_write = LONG_MAX,
>> @@ -215,7 +217,7 @@ static int f2fs_do_sync_file(struct file *file, loff_t start, loff_t end,
>> clear_inode_flag(inode, FI_NEED_IPU);
>>
>> if (ret) {
>> - trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
>> + trace_f2fs_sync_file_exit(inode, cp_reason, datasync, ret);
>> return ret;
>> }
>>
>> @@ -246,10 +248,10 @@ static int f2fs_do_sync_file(struct file *file, loff_t start, loff_t end,
>> * sudden-power-off.
>> */
>> down_read(&F2FS_I(inode)->i_sem);
>> - need_cp = need_do_checkpoint(inode);
>> + cp_reason = need_do_checkpoint(inode);
>> up_read(&F2FS_I(inode)->i_sem);
>>
>> - if (need_cp) {
>> + if (cp_reason) {
>> /* all the dirty node pages should be flushed for POR */
>> ret = f2fs_sync_fs(inode->i_sb, 1);
>>
>> @@ -306,7 +308,7 @@ static int f2fs_do_sync_file(struct file *file, loff_t start, loff_t end,
>> }
>> f2fs_update_time(sbi, REQ_TIME);
>> out:
>> - trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
>> + trace_f2fs_sync_file_exit(inode, cp_reason, datasync, ret);
>> f2fs_trace_ios(NULL, 1);
>> return ret;
>> }
>> diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
>> index 009745564214..f1a317e6db79 100644
>> --- a/include/trace/events/f2fs.h
>> +++ b/include/trace/events/f2fs.h
>> @@ -210,14 +210,14 @@ DEFINE_EVENT(f2fs__inode, f2fs_sync_file_enter,
>>
>> TRACE_EVENT(f2fs_sync_file_exit,
>>
>> - TP_PROTO(struct inode *inode, int need_cp, int datasync, int ret),
>> + TP_PROTO(struct inode *inode, int cp_reason, int datasync, int ret),
>>
>> - TP_ARGS(inode, need_cp, datasync, ret),
>> + TP_ARGS(inode, cp_reason, datasync, ret),
>>
>> TP_STRUCT__entry(
>> __field(dev_t, dev)
>> __field(ino_t, ino)
>> - __field(int, need_cp)
>> + __field(int, cp_reason)
>> __field(int, datasync)
>> __field(int, ret)
>> ),
>> @@ -225,15 +225,15 @@ TRACE_EVENT(f2fs_sync_file_exit,
>> TP_fast_assign(
>> __entry->dev = inode->i_sb->s_dev;
>> __entry->ino = inode->i_ino;
>> - __entry->need_cp = need_cp;
>> + __entry->cp_reason = cp_reason;
>> __entry->datasync = datasync;
>> __entry->ret = ret;
>> ),
>>
>> - TP_printk("dev = (%d,%d), ino = %lu, checkpoint is %s, "
>> + TP_printk("dev = (%d,%d), ino = %lu, cp_reason:%d, "
>> "datasync = %d, ret = %d",
>> show_dev_ino(__entry),
>> - __entry->need_cp ? "needed" : "not needed",
>> + __entry->cp_reason,
>> __entry->datasync,
>> __entry->ret)
>> );
>> --
>> 2.14.1.145.gb3622a4ee
>
> .
>

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