Re: 2.4.20: Proccess stuck in __lock_page ...

[manish (manish@storadinc.com)]

Marcelo Tosatti wrote:

> On Mon, 26 May 2003, manish wrote:
>
> > Hello !
> >
> > I am running the 2.4.20 kernel on a system with 3.5 GB RAM and dual CPU.
> > I am running bonnie accross four drives in parallel:
> >
> > bonnie -s 1000 -d /<dir-name>
> >
> > bdflush settings on this system:
> >
> > [root@dyn-10-123-130-235 vm]# cat bdflush
> > 2       50      32      100     50      300     1       0       0
> >
> > All the bonnie process and any other process (like df, ps -ef etc.) are
> > hung in __lock_page. Breaking into kdb, I observe the following for one
> > such bonnie process:
> >
> > schedule(..)
> > __lock_page(..)
> > lock_page(..)
> > do_generic_file_read(..)
> > generic_file_read(..)
> >
> > After this, the processes never exit the hang. At times, a couple of
> > bonnie processes complete but the hang still occurs with the remaining
> > processes and with the other processes.
> >
> > I tried out the 2.5.33 kernel (one of the 2.5 series) and observed that
> > the hang does not occur. If I run, two bonnie processes, they never get
> > stuck. Actually, if I run 4 parallel mke2fs, they too get stuck.
> >
> > Any clues where this could be happening?
>
> Hi,
>
> Are you sure there is no disk activity ?
>
> Run vmstat and check that, please.
Hello !

My bad. This is one of the kernels that had modified the IO subsystem to 
replace the io_request_lock with a finer grained host_lock and queue_lock.

I also noticed that the hang occurs when the settings of bdflush are the 
following:

root@dyn-10-123-130-235 vm]# cat bdflush
30      50      32      100     50      300     60      0       0

Thanks
-Manish





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