Messages in this thread Patch in this message | | | From | Stanislaw Gruszka <> | Subject | [PATCH -tip 3/4] sched: Avoid prev->stime underflow | Date | Tue, 30 Apr 2013 11:35:06 +0200 |
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Dave Hansen reported strange utime/stime values on his system: https://lkml.org/lkml/2013/4/4/435
This happens because prev->stime value is bigger than rtime value. Root of the problem are non-monotonic rtime values (i.e. current rtime is smaller than previous rtime) and that should be debugged and fixed.
But since problem did not manifest itself before commit 62188451f0d63add7ad0cd2a1ae269d600c1663d "cputime: Avoid multiplication overflow on utime scaling", it should be threated as regression, which we can easily fixed on cputime_adjust() function.
For now, let's apply this fix, but further work is needed to fix root of the problem.
Reported-and-tested-by: Dave Hansen <dave@sr71.net> Cc: <stable@vger.kernel.org> # 3.9+ Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> --- kernel/sched/cputime.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c index 3f192bf..cc2dc3e 100644 --- a/kernel/sched/cputime.c +++ b/kernel/sched/cputime.c @@ -558,7 +558,7 @@ static void cputime_adjust(struct task_cputime *curr, struct cputime *prev, cputime_t *ut, cputime_t *st) { - cputime_t rtime, stime, total; + cputime_t rtime, stime, utime, total; if (vtime_accounting_enabled()) { *ut = curr->utime; @@ -589,13 +589,13 @@ static void cputime_adjust(struct task_cputime *curr, if (prev->stime + prev->utime >= rtime) goto out; - if (!rtime) { - stime = 0; - } else if (!total) { - stime = rtime; - } else { + if (total) { stime = scale_stime((__force u64)stime, (__force u64)rtime, (__force u64)total); + utime = rtime - stime; + } else { + stime = rtime; + utime = 0; } /* @@ -604,7 +604,7 @@ static void cputime_adjust(struct task_cputime *curr, * Let's enforce monotonicity. */ prev->stime = max(prev->stime, stime); - prev->utime = max(prev->utime, rtime - prev->stime); + prev->utime = max(prev->utime, utime); out: *ut = prev->utime; -- 1.7.11.7
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