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authorBrian King <brking@linux.vnet.ibm.com>2009-02-17 06:49:50 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-02-23 15:53:04 +1100
commitf52862f4070fb930e407d466aa82d8efcc98c9ed (patch)
tree750b42530408632015bd77e29879c994fb854429 /arch/powerpc/mm/numa.c
parent448e2ca0e32a5c437650d634b6032ab732662338 (diff)
powerpc/pseries: Fix partition migration hang under load
While testing partition migration with heavy CPU load using shared processors, it was observed that sometimes the migration would never complete and would appear to hang. Currently, the migration code assumes that if H_SUCCESS is returned from the H_JOIN then the migration is complete and the processor is waking up on the target system. If there was an outstanding PROD to the processor when the H_JOIN is called, however, it will return H_SUCCESS on the source system, causing the migration to hang, or in some scenarios cause the kernel to crash on the complete call waking the caller of rtas_percpu_suspend_me. Fix this by calling H_JOIN multiple times if necessary during the migration. Signed-off-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/mm/numa.c')
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