If hmm_range_fault returns -EBUSY, we should call hmm_range_fault again
to validate the remaining pages. On one system with NUMA auto balancing
enabled, hmm_range_fault takes 6 seconds for 1GB range because CPU
migrate the range one page at a time. To be safe, increase timeout value
to 1 second for 128MB range.
Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
pr_debug("hmm range: start = 0x%lx, end = 0x%lx",
hmm_range->start, hmm_range->end);
- /* Assuming 512MB takes maxmium 1 second to fault page address */
- timeout = max((hmm_range->end - hmm_range->start) >> 29, 1UL);
+ /* Assuming 128MB takes maximum 1 second to fault page address */
+ timeout = max((hmm_range->end - hmm_range->start) >> 27, 1UL);
timeout *= HMM_RANGE_DEFAULT_TIMEOUT;
timeout = jiffies + msecs_to_jiffies(timeout);