From owner-freebsd-stable  Mon Aug 23 22:37:57 1999
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Date: Tue, 24 Aug 1999 00:37:49 -0500
From: Alan Cox <alc@cs.rice.edu>
To: Doug Rabson <dfr@nlsystems.com>
Cc: stable@freebsd.org
Subject: Re: mSQL getting stuck in objtrm state (fwd)
Message-ID: <19990824003749.C28920@cs.rice.edu>
References: <Pine.BSF.4.10.9908232146340.72739-100000@salmon.nlsystems.com>
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I found the following "smoking gun" in the code generated
for the vm_object_pip_subtract (atomic_subtract_short)
in swap_pager_iodone:

        } else {
                vm_object_pip_subtract(object, spc->spc_count);
                if ((object->paging_in_progress == 0) &&

translates to ...

0xc01d5a96 <swap_pager_iodone+138>:
    jmp    0xc01d5af6 <swap_pager_iodone+234>
0xc01d5a98 <swap_pager_iodone+140>:     movw   0x3c(%edx),%ax
0xc01d5a9c <swap_pager_iodone+144>:     subw   0x1c(%ebx),%ax
0xc01d5aa0 <swap_pager_iodone+148>:     movw   %ax,0x3c(%edx)
0xc01d5aa4 <swap_pager_iodone+152>:
    jne    0xc01d5ab9 <swap_pager_iodone+173>

I'm looking into backporting -CURRENT's atomic.h now.

Alan


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