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authorDavid S. Miller <davem@davemloft.net>2008-05-19 23:46:00 -0700
committerDavid S. Miller <davem@davemloft.net>2008-05-20 00:33:45 -0700
commit93dae5b70e7c1c8e927d22e1c20a941ca376906a (patch)
treef255087706b9d176455b17e4384f4632f59f4cde /drivers/oprofile
parent88278ca27a43ae503572b52ea2c171fbf45db5a2 (diff)
sparc64: Add global register dumping facility.
When a cpu really is stuck in the kernel, it can be often impossible to figure out which cpu is stuck where. The worst case is when the stuck cpu has interrupts disabled. Therefore, implement a global cpu state capture that uses SMP message interrupts which are not disabled by the normal IRQ enable/disable APIs of the kernel. As long as we can get a sysrq 'y' to the kernel, we can get a dump. Even if the console interrupt cpu is wedged, we can trigger it from userspace using /proc/sysrq-trigger The output is made compact so that this facility is more useful on high cpu count systems, which is where this facility will likely find itself the most useful :) Signed-off-by: David S. Miller <davem@davemloft.net>
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