[
https://issues.apache.org/jira/browse/TS-4613?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Oknet Xu updated TS-4613:
-------------------------
Description:
"thread_data_used" indicate the usage of EThread::thread_private[ ].
The EThread::thread_private[ ] saved thread specific data e.g. :
- stat system arrays
- NetHandler object
- PollCont object
However, the private data of thread group are different.
Sharing thread_data_used cause the waste of space.
was:
NetHandler has a method: _close_vc ， It is called by InactivityCop.
first, create a dummy Event in stack,
then call UnixNetVConnection::mainEvent by vc->handleEvent(EVENT_IMMEDIATE,
&event);
the handleEvent is mainEvent here.
In the UnixNetVConnection::mainEvent code:
```
int
UnixNetVConnection::mainEvent(int event, Event *e)
{
ink_assert(event == EVENT_IMMEDIATE || event == EVENT_INTERVAL);
ink_assert(thread == this_ethread());
MUTEX_TRY_LOCK(hlock, get_NetHandler(thread)->mutex, e->ethread);
MUTEX_TRY_LOCK(rlock, read.vio.mutex ? read.vio.mutex : e->ethread->mutex,
e->ethread);
MUTEX_TRY_LOCK(wlock, write.vio.mutex ? write.vio.mutex : e->ethread->mutex,
e->ethread);
if (!hlock.is_locked() || !rlock.is_locked() || !wlock.is_locked() ||
(read.vio.mutex && rlock.get_mutex() != read.vio.mutex.get()) ||
(write.vio.mutex && wlock.get_mutex() != write.vio.mutex.get())) {
#ifdef INACTIVITY_TIMEOUT
if (e == active_timeout)
#endif
e->schedule_in(HRTIME_MSECONDS(net_retry_delay));
return EVENT_CONT;
}
```
the dummy Event would be schedule_in into Event System by
e->schedule_in(HRTIME_MSECONDS(net_retry_delay));
I think we should move the schedule_in into the INACTIVITY_TIMEOUT macro.
```
#ifdef INACTIVITY_TIMEOUT
if (e == active_timeout)
e->schedule_in(HRTIME_MSECONDS(net_retry_delay));
#endif
```
I'm try to allocate a Event instead dummy Event, but meet Event System callback
on a deallocated UnixNetVConnection.
due to NetHandler called close_UnixNetVConnection before Event System callback
the Event by schedule_in.
In NetHandler::_close_vc, depend the return value (EVENT_DONE or EVENT_CONT)
from UnixNetVConnection::mainEvent, to do ++handle_event; or not.
```
if (vc->handleEvent(EVENT_IMMEDIATE, &event) == EVENT_DONE)
++handle_event;
```
the 3 MUTEX_TRY_LOCK not always success on InactivityCop callback,
due to the mutex of ServerSessionVC may different from ClientSessionVC.
Only mutex of ServerSession is set to HttpSM when HttpSM pick up a Server
Session from SessionPool. ServerSessionVC still keep the old mutex.
> Set an independent thread_data_used for each thread group instead of sharing
> one thread_data_used
> -------------------------------------------------------------------------------------------------
>
> Key: TS-4613
> URL: https://issues.apache.org/jira/browse/TS-4613
> Project: Traffic Server
> Issue Type: Bug
> Components: Core
> Reporter: Oknet Xu
> Assignee: Oknet Xu
> Fix For: 7.0.0
>
>
> "thread_data_used" indicate the usage of EThread::thread_private[ ].
> The EThread::thread_private[ ] saved thread specific data e.g. :
> - stat system arrays
> - NetHandler object
> - PollCont object
> However, the private data of thread group are different.
> Sharing thread_data_used cause the waste of space.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
