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Balbir Singh 49048622ea sched: fix process time monotonicity

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>

2008-09-05 18:14:35 +02:00

array.c

sched: fix process time monotonicity

2008-09-05 18:14:35 +02:00

base.c

proc: fix warnings

2008-08-05 14:33:50 -07:00

generic.c

[PATCH] proc: inode number fixlet

2008-08-25 01:18:03 -04:00

inode-alloc.txt

Linux-2.6.12-rc2