Messages in this thread | | | Date | Tue, 03 May 2011 02:28:46 -0700 | From | Paul Turner <> | Subject | [patch 00/15] CFS Bandwidth Control V6 |
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[ Apologies if you're receiving this twice, the previous mailing did not seem to make it to the list for some reason ].
Hi all,
Please find attached the latest iteration of bandwidth control (v6).
Where the previous release cleaned up many of the semantics surrounding the update_curr() path and throttling, this release is focused on cleaning up the patchset itself. Elements such as the notion of expiring bandwidth from previous quota periods as well as some of the core accounting changes have been pushed up (and re-written for clarity) within the patchset reducing the patch-to-patch churn significantly.
While this restructuring was fairly extensive in terms of the code touched, there are no major behavioral changes beyond bug fixes.
Thanks to Hidetoshi Seto for identifying the throttle list corruption.
Notable changes: - Runtime is now actively expired taking advantage of the bounds placed on sched_clock syncrhonization. - distribute_cfs_runtime() no longer races with throttles around the period boundary. - Major code cleanup
Bug fixes: - several interactions with active load-balance have been corrected. This was manifesting previously in throttle_list corruption and crashes.
Interface: ---------- Three new cgroupfs files are exported by the cpu subsystem: cpu.cfs_period_us : period over which bandwidth is to be regulated cpu.cfs_quota_us : bandwidth available for consumption per period cpu.stat : statistics (such as number of throttled periods and total throttled time) One important interface change that this introduces (versus the rate limits proposal) is that the defined bandwidth becomes an absolute quantifier.
Previous postings: ----------------- v5: https://lkml.org/lkml/2011/3/22/477 v4: https://lkml.org/lkml/2011/2/23/44 v3: https://lkml.org/lkml/2010/10/12/44 v2: http://lkml.org/lkml/2010/4/28/88 Original posting: http://lkml.org/lkml/2010/2/12/393
Prior approaches: http://lkml.org/lkml/2010/1/5/44 ["CFS Hard limits v5"]
Thanks,
- Paul
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