56 lines
1.9 KiB
Diff
56 lines
1.9 KiB
Diff
From: Stanislaw Gruszka <sgruszka@redhat.com>
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Date: Tue, 14 Sep 2010 14:35:14 +0000 (+0200)
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Subject: sched: Fix user time incorrectly accounted as system time on 32-bit
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X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Fx86%2Flinux-2.6-tip.git;a=commitdiff_plain;h=e75e863dd5c7d96b91ebbd241da5328fc38a78cc
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sched: Fix user time incorrectly accounted as system time on 32-bit
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We have 32-bit variable overflow possibility when multiply in
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task_times() and thread_group_times() functions. When the
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overflow happens then the scaled utime value becomes erroneously
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small and the scaled stime becomes i erroneously big.
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Reported here:
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https://bugzilla.redhat.com/show_bug.cgi?id=633037
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https://bugzilla.kernel.org/show_bug.cgi?id=16559
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Reported-by: Michael Chapman <redhat-bugzilla@very.puzzling.org>
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Reported-by: Ciriaco Garcia de Celis <sysman@etherpilot.com>
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Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
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Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
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Cc: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
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Cc: <stable@kernel.org> # 2.6.32.19+ (partially) and 2.6.33+
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LKML-Reference: <20100914143513.GB8415@redhat.com>
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Signed-off-by: Ingo Molnar <mingo@elte.hu>
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---
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diff --git a/kernel/sched.c b/kernel/sched.c
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index ed09d4f..dc85ceb 100644
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--- a/kernel/sched.c
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+++ b/kernel/sched.c
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@@ -3513,9 +3513,9 @@ void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st)
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rtime = nsecs_to_cputime(p->se.sum_exec_runtime);
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if (total) {
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- u64 temp;
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+ u64 temp = rtime;
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- temp = (u64)(rtime * utime);
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+ temp *= utime;
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do_div(temp, total);
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utime = (cputime_t)temp;
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} else
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@@ -3546,9 +3546,9 @@ void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st)
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rtime = nsecs_to_cputime(cputime.sum_exec_runtime);
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if (total) {
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- u64 temp;
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+ u64 temp = rtime;
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- temp = (u64)(rtime * cputime.utime);
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+ temp *= cputime.utime;
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do_div(temp, total);
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utime = (cputime_t)temp;
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} else
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