Messages in this thread | ![/](/images/icornerl.gif) | | Date | Mon, 29 Nov 2010 17:42:37 +0100 | From | Michael Holzheu <> | Subject | [patch v2 0/4] taskstats: Improve cumulative time accounting |
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Version 2 --------- * Integrate review comments (see change log of single patches) * Add sysctl to switch to new behavior instead of adding the additional cdata_acct to struct signal (see patch 3)
Due to POSIX POSIX.1-2001, the CPU time of processes is not accounted to the cumulative time of the parents, if the parents ignore SIGCHLD or have set SA_NOCLDWAIT. This behaviour has the major drawback that it is not possible to calculate all consumed CPU time of a system by looking at the current tasks. CPU time can be lost.
This patch series adds a new sysctl "full_cdata" that allows to switch the kernel to a mode where also the missing data is accounted to the cumulative counters.
PATCH SET OVERVIEW ------------------ Patches apply on: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
[1] Introduce "struct cdata" [2] Introduce __account_cdata() function [3] Introduce kernel.full_cdata sysctl [4] Export "cdata_wait" CPU times with taskstats
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