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519a019491
After realising we need to sample RING_START to detect context switches from preemption events that do not allow for the seqno to advance, we can also realise that the seqno itself is just a distance along the ring and so can be replaced by sampling RING_HEAD. v2: Bonus comment for the mystery separate CS_STALL before MI_USER_INTERRUPT Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190508080704.24223-1-chris@chris-wilson.co.uk |
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