https://github.com/torvalds/linux
Revision 49048622eae698e5c4ae61f7e71200f265ccc529 authored by Balbir Singh on 05 September 2008, 16:12:23 UTC, committed by Ingo Molnar on 05 September 2008, 16:14:35 UTC
Spencer reported a problem where utime and stime were going negative despite
the fixes in commit b27f03d4bdc145a09fb7b0c0e004b29f1ee555fa. The suspected
reason for the problem is that signal_struct maintains it's own utime and
stime (of exited tasks), these are not updated using the new task_utime()
routine, hence sig->utime can go backwards and cause the same problem
to occur (sig->utime, adds tsk->utime and not task_utime()). This patch
fixes the problem

TODO: using max(task->prev_utime, derived utime) works for now, but a more
generic solution is to implement cputime_max() and use the cputime_gt()
function for comparison.

Reported-by: spencer@bluehost.com
Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
1 parent 56c7426
History
Tip revision: 49048622eae698e5c4ae61f7e71200f265ccc529 authored by Balbir Singh on 05 September 2008, 16:12:23 UTC
sched: fix process time monotonicity
Tip revision: 4904862
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