Re: as_arq scheduler alloc with 2.6.0-test8-mm1

[Amit Patel <patelamitv@yahoo.com>]

Hi 

After doing some printk debugging looks like for each
block device we allocate elevator structure. But
during cleanup the elevator->elevator_data is never
freed. In printk I put printk in as-iosched.c:as_alloc
where I see elevator_data is allocated from as_arq
pool and it should have been freed as a part of block
device cleanup through elevator_release function. I
never see it coming to elevatore_release function. 

I will try to walk through code some more and see if I
can figure out who was supposed to call
elevator_release as part of cleanup. Let me know if I
am going on wrong track here.

Thanks
Amit
--- Nick Piggin <piggin@cyberone.com.au> wrote:
> 
> 
> Mr Amit Patel wrote:
> 
> >Hi Andrew,
> >
> >The qlogic driver is for Fibre Channel HBA QLA2342.
> >This is a beta driver which is part of the mjb1
> patch
> >against 2.6.0-test8. As a part of driver insmod,
> >driver tries to find fiber channel device and maps
> it
> >to scsi block device. Actually I don't have any
> fibre
> >channel target attached, so driver does not find
> any
> >scsi devices and discovery finishes without adding
> any
> >block device. 
> >
> >I am trying to go through driver scsi_scan process
> and
> >see when does actual allocation from as_arq
> happens.
> >But for some reason after going to kgdb I get
> SIGEMT
> >and I cannot debug further. What is causing SIGEMT
> >cause after doing some search looks like its
> actually
> >SIGUSR but linux treats it as SIGEMT. Is there any
> way
> >to prevent SIGEMT when I want to use kgdb ? 
> >
> >Thanks for your help,
> >
> 
> Hi Amit,
> 
> I'm a little bit busy to look at this now, however
> someone
> is looking into all these refcounting problems.
> 
> If you would like to narrow it down a bit, check
> that the
> request queues that are allocated are all released
> when the
> driver is unloaded (drivers/block/ll_rw_blk.c
> blk_alloc_queue
> and blk_cleanup_queue). Just stick a couple of
> printks there
> if your debugger isn't working.
> 
> 


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