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SubjectRe: [PATCH] ocfs2: add last unlock times in locking_state
Hello Joseph,


>>> On 4/26/2019 at 9:21 am, in message
<c855abce-d62c-5fe0-3b31-c252077b4530@gmail.com>, Joseph Qi
<jiangqi903@gmail.com> wrote:
> Hi Gang,
>
> On 19/4/25 17:12, Gang He wrote:
>> ocfs2 file system uses locking_state file under debugfs to dump
>> each ocfs2 file system's dlm lock resources, but the dlm lock
>> resources in memory are becoming more and more after the files
>> were touched by the user. it will become a bit difficult to analyze
>> these dlm lock resource records in locking_state file by the upper
>> scripts, though some files are not active for now, which were
>> accessed long time ago.
>> Then, I'd like to add last pr/ex unlock times in locking_state file
>> for each dlm lock resource record, the the upper scripts can use
>> last unlock time to filter inactive dlm lock resource record.
>>
>> Signed-off-by: Gang He <ghe@suse.com>
>> ---
>> fs/ocfs2/dlmglue.c | 21 +++++++++++++++++----
>> fs/ocfs2/ocfs2.h | 1 +
>> 2 files changed, 18 insertions(+), 4 deletions(-)
>>
>> diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
>> index af405586c5b1..dccf4136f8c1 100644
>> --- a/fs/ocfs2/dlmglue.c
>> +++ b/fs/ocfs2/dlmglue.c
>> @@ -448,7 +448,7 @@ static void ocfs2_update_lock_stats(struct
> ocfs2_lock_res *res, int level,
>> struct ocfs2_mask_waiter *mw, int ret)
>> {
>> u32 usec;
>> - ktime_t kt;
>> + ktime_t last, kt;
>> struct ocfs2_lock_stats *stats;
>>
>> if (level == LKM_PRMODE)
>> @@ -458,7 +458,8 @@ static void ocfs2_update_lock_stats(struct
> ocfs2_lock_res *res, int level,
>> else
>> return;
>>
>> - kt = ktime_sub(ktime_get(), mw->mw_lock_start);
>> + last = ktime_get();
>> + kt = ktime_sub(last, mw->mw_lock_start);
>> usec = ktime_to_us(kt);
>>
>> stats->ls_gets++;
>> @@ -474,6 +475,8 @@ static void ocfs2_update_lock_stats(struct
> ocfs2_lock_res *res, int level,
>>
>> if (ret)
>> stats->ls_fail++;
>> +
>> + stats->ls_last = ktime_to_timespec(last).tv_sec;
>> }
>>
>> static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res *lockres)
>> @@ -3093,8 +3096,10 @@ static void *ocfs2_dlm_seq_next(struct seq_file *m,
> void *v, loff_t *pos)
>> * - Lock stats printed
>> * New in version 3
>> * - Max time in lock stats is in usecs (instead of nsecs)
>> + * New in version 4
>> + * - Add last pr/ex unlock times in secs
>
> Why not usecs?
The time is the seconds from the system boot, just like uptime command.
I feel the user do not care more accurate time, secondly, the u32 type can keep more long time until it overflows.

> BTW, should we change tools side like debugfs as well?
Theoretically, the format will affect the upper debugfs.ocfs2 tool,
but, I quickly look at this part code of debugfs.ocfs2, this part code looks has been dead.
Anyway, I will look at this part carefully, if it still works, I will do the corresponding change.


Thanks
Gang


>
> Thanks,
> Joseph
>
>> */
>> -#define OCFS2_DLM_DEBUG_STR_VERSION 3
>> +#define OCFS2_DLM_DEBUG_STR_VERSION 4
>> static int ocfs2_dlm_seq_show(struct seq_file *m, void *v)
>> {
>> int i;
>> @@ -3145,6 +3150,8 @@ static int ocfs2_dlm_seq_show(struct seq_file *m, void
> *v)
>> # define lock_max_prmode(_l) ((_l)->l_lock_prmode.ls_max)
>> # define lock_max_exmode(_l) ((_l)->l_lock_exmode.ls_max)
>> # define lock_refresh(_l) ((_l)->l_lock_refresh)
>> +# define lock_last_prmode(_l) ((_l)->l_lock_prmode.ls_last)
>> +# define lock_last_exmode(_l) ((_l)->l_lock_exmode.ls_last)
>> #else
>> # define lock_num_prmode(_l) (0)
>> # define lock_num_exmode(_l) (0)
>> @@ -3155,6 +3162,8 @@ static int ocfs2_dlm_seq_show(struct seq_file *m, void
> *v)
>> # define lock_max_prmode(_l) (0)
>> # define lock_max_exmode(_l) (0)
>> # define lock_refresh(_l) (0)
>> +# define lock_last_prmode(_l) (0)
>> +# define lock_last_exmode(_l) (0)
>> #endif
>> /* The following seq_print was added in version 2 of this output */
>> seq_printf(m, "%u\t"
>> @@ -3165,6 +3174,8 @@ static int ocfs2_dlm_seq_show(struct seq_file *m, void
> *v)
>> "%llu\t"
>> "%u\t"
>> "%u\t"
>> + "%u\t"
>> + "%u\t"
>> "%u\t",
>> lock_num_prmode(lockres),
>> lock_num_exmode(lockres),
>> @@ -3174,7 +3185,9 @@ static int ocfs2_dlm_seq_show(struct seq_file *m, void
> *v)
>> lock_total_exmode(lockres),
>> lock_max_prmode(lockres),
>> lock_max_exmode(lockres),
>> - lock_refresh(lockres));
>> + lock_refresh(lockres),
>> + lock_last_prmode(lockres),
>> + lock_last_exmode(lockres));
>>
>> /* End the line */
>> seq_printf(m, "\n");
>> diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
>> index 1f029fbe8b8d..8efa022684f4 100644
>> --- a/fs/ocfs2/ocfs2.h
>> +++ b/fs/ocfs2/ocfs2.h
>> @@ -164,6 +164,7 @@ struct ocfs2_lock_stats {
>>
>> /* Storing max wait in usecs saves 24 bytes per inode */
>> u32 ls_max; /* Max wait in USEC */
>> + u32 ls_last; /* Last unlock time in SEC */
>> };
>> #endif
>>
>>

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