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nova/scheduler/filters/ram_filter.py

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        free_ram_mb = host_state.free_ram_mb

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        total_usable_ram_mb = host_state.total_usable_ram_mb

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        used_ram_mb = total_usable_ram_mb - free_ram_mb

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        return (total_usable_ram_mb * FLAGS.ram_allocation_ratio -

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                used_ram_mb >= requested_ram)

 

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        usable_ram = (total_usable_ram_mb * FLAGS.ram_allocation_ratio -

 

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                used_ram_mb)

 

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        if not usable_ram >= requested_ram:

 

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            LOG.debug(_("%(host_state)s does not have %(requested_ram)s MB "

 

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                    "usable ram, it only has %(usable_ram)s MB usable ram."),

 

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                    locals())

 

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            return False

 

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        return True

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