Bug 168483
| Summary: | FEAT: [RHEL4 U3] kernel dm: Statistic information about dm devices (*) | ||||||
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| Product: | Red Hat Enterprise Linux 4 | Reporter: | Issue Tracker <tao> | ||||
| Component: | kernel | Assignee: | Alasdair Kergon <agk> | ||||
| Status: | CLOSED ERRATA | QA Contact: | |||||
| Severity: | medium | Docs Contact: | |||||
| Priority: | medium | ||||||
| Version: | 4.0 | CC: | jbaron, jnomura, kueda, milan.kerslager, tao, tkincaid | ||||
| Target Milestone: | --- | Keywords: | FutureFeature | ||||
| Target Release: | --- | ||||||
| Hardware: | All | ||||||
| OS: | Linux | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | RHSA-2006-0132 | Doc Type: | Enhancement | ||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2006-03-07 19:59:00 UTC | Type: | --- | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Embargoed: | |||||||
| Bug Depends On: | |||||||
| Bug Blocks: | 168429, 173398 | ||||||
| Attachments: |
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The patch for (1) is simple - needs a review, but certainly feasible for U3. The patch for (2) also exists but is more complex - not reviewed properly yet, API needs more work, but might be possible to include it in some form in U3 if there's time. *** Bug 143390 has been marked as a duplicate of this bug. *** *** Bug 170693 has been marked as a duplicate of this bug. *** Created attachment 121243 [details] test cases for dm diskstat Test cases for dm diskstat. To complete this test, timing information collected by BZ#173398 is also needed. - Criteria for read_ticks, write_ticks, io_ticks may be too strict and sometimes cause false negative. Needs several trials to avoid it. - There may be better/finer criterion for time_in_queue. An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2006-0132.html |
This feature request can be broken down into 4 items: 1) Kernel changes for dm to use the existing kernel I/O stats mechanism; 2) A new kernel dm module to gather sophisticated customised stats; 3) Simple userspace tools changes to make it easy to use (2); 4) Sophisticated userspace tools (and gui) changes to get the best out of (2). I'm going to use this bugzilla to cover 1 and 2 ('kernel' component). Someone might like to raise new ones to cover 3 and 4 (device-mapper / lvm2 / lvm2 GUI components).