[wangshilong]

…ing object ULT creation

During migration, the system xstream only wakes up in ds_migrate_query_status() (called by rebuild_tgt_status_check_ult()), where it sleeps for RBLD_CHECK_INTV (2 seconds). This caused the system xstream to remain blocked for 2-second intervals without performing any operations, severely degrading rebuild performance.

Benchmark results demonstrate the improvement:

Without patch: 99,780 objects processed in 120 seconds

With patch: 225,136 objects processed in 11 seconds

The patch achieves approximately 20x performance improvement

Steps for the author:

• Commit message follows the guidelines.
• Appropriate Features or Test-tag pragmas were used.
• Appropriate Functional Test Stages were run.
• At least two positive code reviews including at least one code owner from each category referenced in the PR.
• Testing is complete. If necessary, forced-landing label added and a reason added in a comment.

After all prior steps are complete:

• Gatekeeper requested (daos-gatekeeper added as a reviewer).

[github-actions]

Ticket title is 'fixes excessive waiting time in system xstream during object ULT creation'
Status is 'In Review'
Job should run at elevated priority (1)
https://daosio.atlassian.net/browse/DAOS-17905

[daosbuild3]

Test stage Functional Hardware Medium completed with status FAILURE. https://jenkins-3.daos.hpc.amslabs.hpecorp.net//job/daos-stack/job/daos/view/change-requests/job/PR-16740/6/execution/node/617/log

[daosbuild3]

Test stage Functional Hardware Large MD on SSD completed with status FAILURE. https://jenkins-3.daos.hpc.amslabs.hpecorp.net//job/daos-stack/job/daos/view/change-requests/job/PR-16740/8/execution/node/1634/log

[daosbuild3]

Test stage Functional Hardware Medium completed with status FAILURE. https://jenkins-3.daos.hpc.amslabs.hpecorp.net//job/daos-stack/job/daos/view/change-requests/job/PR-16740/9/execution/node/516/log

[daosbuild3]

Test stage Functional Hardware Medium MD on SSD completed with status FAILURE. https://jenkins-3.daos.hpc.amslabs.hpecorp.net//job/daos-stack/job/daos/view/change-requests/job/PR-16740/9/execution/node/530/log