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SubjectRe: [PATCH V4 3/3] ocfs2: add first lock wait time in locking_state
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Hi Gang,

On 19/6/11 09:54, Gang He wrote:
> ocfs2 file system uses locking_state file under debugfs to dump
> each ocfs2 file system's dlm lock resources, but the users ever
> encountered some hang(deadlock) problems in ocfs2 file system.
> I'd like to add first lock wait time in locking_state file, which
> can help the upper scripts detect these deadlock problems via
> comparing the first lock wait time with the current time.
>
> Signed-off-by: Gang He <ghe@suse.com>
> ---
> fs/ocfs2/dlmglue.c | 32 +++++++++++++++++++++++++++++---
> fs/ocfs2/ocfs2.h | 1 +
> 2 files changed, 30 insertions(+), 3 deletions(-)
>
> diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
> index d4caa6d117c6..8ce4b76f81ee 100644
> --- a/fs/ocfs2/dlmglue.c
> +++ b/fs/ocfs2/dlmglue.c
> @@ -440,6 +440,7 @@ static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res)
> static void ocfs2_init_lock_stats(struct ocfs2_lock_res *res)
> {
> res->l_lock_refresh = 0;
> + res->l_lock_wait = 0;
> memset(&res->l_lock_prmode, 0, sizeof(struct ocfs2_lock_stats));
> memset(&res->l_lock_exmode, 0, sizeof(struct ocfs2_lock_stats));
> }
> @@ -483,6 +484,21 @@ static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res *lockres)
> lockres->l_lock_refresh++;
> }
>
> +static inline void ocfs2_track_lock_wait(struct ocfs2_lock_res *lockres)
> +{
> + struct ocfs2_mask_waiter *mw;
> +
> + if (list_empty(&lockres->l_mask_waiters)) {
> + lockres->l_lock_wait = 0;
> + return;
> + }
> +
> + mw = list_first_entry(&lockres->l_mask_waiters,
> + struct ocfs2_mask_waiter, mw_item);
> + lockres->l_lock_wait =
> + ktime_to_us(ktime_mono_to_real(mw->mw_lock_start));

I wonder why ktime_mono_to_real() here?

Thanks,
Joseph

> +}
> +
> static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter *mw)
> {
> mw->mw_lock_start = ktime_get();
> @@ -498,6 +514,9 @@ static inline void ocfs2_update_lock_stats(struct ocfs2_lock_res *res,
> static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res *lockres)
> {
> }
> +static inline void ocfs2_track_lock_wait(struct ocfs2_lock_res *lockres)
> +{
> +}
> static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter *mw)
> {
> }
> @@ -891,6 +910,7 @@ static void lockres_set_flags(struct ocfs2_lock_res *lockres,
> list_del_init(&mw->mw_item);
> mw->mw_status = 0;
> complete(&mw->mw_complete);
> + ocfs2_track_lock_wait(lockres);
> }
> }
> static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or)
> @@ -1402,6 +1422,7 @@ static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres,
> list_add_tail(&mw->mw_item, &lockres->l_mask_waiters);
> mw->mw_mask = mask;
> mw->mw_goal = goal;
> + ocfs2_track_lock_wait(lockres);
> }
>
> /* returns 0 if the mw that was removed was already satisfied, -EBUSY
> @@ -1418,6 +1439,7 @@ static int __lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres,
>
> list_del_init(&mw->mw_item);
> init_completion(&mw->mw_complete);
> + ocfs2_track_lock_wait(lockres);
> }
>
> return ret;
> @@ -3098,7 +3120,7 @@ static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos)
> * 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 usecs
> + * - Add last pr/ex unlock times and first lock wait time in usecs
> */
> #define OCFS2_DLM_DEBUG_STR_VERSION 4
> static int ocfs2_dlm_seq_show(struct seq_file *m, void *v)
> @@ -3116,7 +3138,7 @@ static int ocfs2_dlm_seq_show(struct seq_file *m, void *v)
> return -EINVAL;
>
> #ifdef CONFIG_OCFS2_FS_STATS
> - if (dlm_debug->d_filter_secs) {
> + if (!lockres->l_lock_wait && dlm_debug->d_filter_secs) {
> now = ktime_to_us(ktime_get_real());
> if (lockres->l_lock_prmode.ls_last >
> lockres->l_lock_exmode.ls_last)
> @@ -3177,6 +3199,7 @@ static int ocfs2_dlm_seq_show(struct seq_file *m, void *v)
> # 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)
> +# define lock_wait(_l) ((_l)->l_lock_wait)
> #else
> # define lock_num_prmode(_l) (0)
> # define lock_num_exmode(_l) (0)
> @@ -3189,6 +3212,7 @@ static int ocfs2_dlm_seq_show(struct seq_file *m, void *v)
> # define lock_refresh(_l) (0)
> # define lock_last_prmode(_l) (0ULL)
> # define lock_last_exmode(_l) (0ULL)
> +# define lock_wait(_l) (0ULL)
> #endif
> /* The following seq_print was added in version 2 of this output */
> seq_printf(m, "%u\t"
> @@ -3201,6 +3225,7 @@ static int ocfs2_dlm_seq_show(struct seq_file *m, void *v)
> "%u\t"
> "%u\t"
> "%llu\t"
> + "%llu\t"
> "%llu\t",
> lock_num_prmode(lockres),
> lock_num_exmode(lockres),
> @@ -3212,7 +3237,8 @@ static int ocfs2_dlm_seq_show(struct seq_file *m, void *v)
> lock_max_exmode(lockres),
> lock_refresh(lockres),
> lock_last_prmode(lockres),
> - lock_last_exmode(lockres));
> + lock_last_exmode(lockres),
> + lock_wait(lockres));
>
> /* End the line */
> seq_printf(m, "\n");
> diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
> index 6d0a77703d0e..99ce40063da6 100644
> --- a/fs/ocfs2/ocfs2.h
> +++ b/fs/ocfs2/ocfs2.h
> @@ -206,6 +206,7 @@ struct ocfs2_lock_res {
> #ifdef CONFIG_OCFS2_FS_STATS
> struct ocfs2_lock_stats l_lock_prmode; /* PR mode stats */
> u32 l_lock_refresh; /* Disk refreshes */
> + u64 l_lock_wait; /* First lock wait time */
> struct ocfs2_lock_stats l_lock_exmode; /* EX mode stats */
> #endif
> #ifdef CONFIG_DEBUG_LOCK_ALLOC
>

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