Hi Gang,
You worry won't exist. kthread_create will take care of it.
Thanks,
Joseph
On 2015/11/2 10:47, Gang He wrote:
> Hello Joseph,
>
> It make sense to make the thread name unique, here are some comments inline.
>
>
>>>>
>> A node can mount multiple ocfs2 volumes. And if thread names are same
>> for each volume/domain, it will bring inconvenience when analyzing
>> problems because we have to identify which volume/domain the messages
>> belong to.
>> Since thread name will be printed to messages, so add volume uuid or dlm
>> name to thread name can benefit problem analysis.
>>
>> Signed-off-by: Joseph Qi <joseph...@huawei.com>
>> ---
>> fs/ocfs2/dlm/dlmdomain.c | 4 +++-
>> fs/ocfs2/dlm/dlmrecovery.c | 2 +-
>> fs/ocfs2/dlm/dlmthread.c | 3 ++-
>> fs/ocfs2/dlmglue.c | 3 ++-
>> fs/ocfs2/journal.c | 4 ++--
>> 5 files changed, 10 insertions(+), 6 deletions(-)
>>
>> diff --git a/fs/ocfs2/dlm/dlmdomain.c b/fs/ocfs2/dlm/dlmdomain.c
>> index 7df88a6..cc794b5 100644
>> --- a/fs/ocfs2/dlm/dlmdomain.c
>> +++ b/fs/ocfs2/dlm/dlmdomain.c
>> @@ -1860,6 +1860,7 @@ static int dlm_join_domain(struct dlm_ctxt *dlm)
>> int status;
>> unsigned int backoff;
>> unsigned int total_backoff = 0;
>> + char wq_name[O2NM_MAX_NAME_LEN];
>>
>> BUG_ON(!dlm);
>>
>> @@ -1889,7 +1890,8 @@ static int dlm_join_domain(struct dlm_ctxt *dlm)
>> goto bail;
>> }
>>
>> - dlm->dlm_worker = create_singlethread_workqueue("dlm_wq");
>> + snprintf(wq_name, O2NM_MAX_NAME_LEN, "dlm_wq-%s", dlm->name);
> If the dm->name is too length, the wq_name will be filled fully without the
> trailing '\0', then pass the wq_name to create_singlethread_workqueue is OK?
> Maybe the code looks like,
> snprintf(wq_name, O2NM_MAX_NAME_LEN, "dlm_wq-%s", dlm->name);
> wq_name[O2NM_MAX_NAME_LEN - 1] = '\0';
>
>> + dlm->dlm_worker = create_singlethread_workqueue(wq_name);
>> if (!dlm->dlm_worker) {
>> status = -ENOMEM;
>> mlog_errno(status);
>> diff --git a/fs/ocfs2/dlm/dlmrecovery.c b/fs/ocfs2/dlm/dlmrecovery.c
>> index a43f9ef..8caf881 100644
>> --- a/fs/ocfs2/dlm/dlmrecovery.c
>> +++ b/fs/ocfs2/dlm/dlmrecovery.c
>> @@ -205,7 +205,7 @@ int dlm_launch_recovery_thread(struct dlm_ctxt *dlm)
>> mlog(0, "starting dlm recovery thread...\n");
>>
>> dlm->dlm_reco_thread_task = kthread_run(dlm_recovery_thread, dlm,
>> - "dlm_reco_thread");
>> + "dlm_reco-%s", dlm->name);
>> if (IS_ERR(dlm->dlm_reco_thread_task)) {
>> mlog_errno(PTR_ERR(dlm->dlm_reco_thread_task));
>> dlm->dlm_reco_thread_task = NULL;
>> diff --git a/fs/ocfs2/dlm/dlmthread.c b/fs/ocfs2/dlm/dlmthread.c
>> index 69aac6f..a1b6c34 100644
>> --- a/fs/ocfs2/dlm/dlmthread.c
>> +++ b/fs/ocfs2/dlm/dlmthread.c
>> @@ -483,7 +483,8 @@ int dlm_launch_thread(struct dlm_ctxt *dlm)
>> {
>> mlog(0, "Starting dlm_thread...\n");
>>
>> - dlm->dlm_thread_task = kthread_run(dlm_thread, dlm, "dlm_thread");
>> + dlm->dlm_thread_task = kthread_run(dlm_thread, dlm, "dlm-%s",
>> + dlm->name);
>> if (IS_ERR(dlm->dlm_thread_task)) {
>> mlog_errno(PTR_ERR(dlm->dlm_thread_task));
>> dlm->dlm_thread_task = NULL;
>> diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
>> index 23157e4..fd4f536 100644
>> --- a/fs/ocfs2/dlmglue.c
>> +++ b/fs/ocfs2/dlmglue.c
>> @@ -2998,7 +2998,8 @@ int ocfs2_dlm_init(struct ocfs2_super *osb)
>> }
>>
>> /* launch downconvert thread */
>> - osb->dc_task = kthread_run(ocfs2_downconvert_thread, osb, "ocfs2dc");
>> + osb->dc_task = kthread_run(ocfs2_downconvert_thread, osb, "ocfs2dc-%s",
> uuid_str looks a little long, e.g. 27F06FE897C742D1B2FD435D477B458E,
> If use th full string to pack a thread name, the name looks too long, I just
> suggestion to use the first 6 characters.
> The first 6 characters should be unique in a machine, will not be conflicted
> between a few ocfs2 mountings.
>
>> + osb->uuid_str);
>> if (IS_ERR(osb->dc_task)) {
>> status = PTR_ERR(osb->dc_task);
>> osb->dc_task = NULL;
>> diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
>> index 627d88c..86b9a93 100644
>> --- a/fs/ocfs2/journal.c
>> +++ b/fs/ocfs2/journal.c
>> @@ -1074,7 +1074,7 @@ int ocfs2_journal_load(struct ocfs2_journal *journal,
>> int local, int replayed)
>> /* Launch the commit thread */
>> if (!local) {
>> osb->commit_task = kthread_run(ocfs2_commit_thread, osb,
>> - "ocfs2cmt");
>> + "ocfs2cmt-%s", osb->uuid_str);
>> if (IS_ERR(osb->commit_task)) {
>> status = PTR_ERR(osb->commit_task);
>> osb->commit_task = NULL;
>> @@ -1491,7 +1491,7 @@ void ocfs2_recovery_thread(struct ocfs2_super *osb,
>> int
>> node_num)
>> goto out;
>>
>> osb->recovery_thread_task = kthread_run(__ocfs2_recovery_thread, osb,
>> - "ocfs2rec");
>> + "ocfs2rec-%s", osb->uuid_str);
>> if (IS_ERR(osb->recovery_thread_task)) {
>> mlog_errno((int)PTR_ERR(osb->recovery_thread_task));
>> osb->recovery_thread_task = NULL;
>> --
>> 1.8.4.3
>>
>>
>> _______________________________________________
>> Ocfs2-devel mailing list
>> Ocfs2-devel@oss.oracle.com
>> https://oss.oracle.com/mailman/listinfo/ocfs2-devel
>
> .
>
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