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Revert "sched/cputime: Refactor the cputime_adjust() code"
This reverts commit 72298e5c92
.
As Peter explains:
> Argh, no... That code was perfectly fine. The new code otoh is
> convoluted.
>
> The old code had the following form:
>
> if (exception1)
> deal with exception1
>
> if (execption2)
> deal with exception2
>
> do normal stuff
>
> Which is as simple and straight forward as it gets.
>
> The new code otoh reads like:
>
> if (!exception1) {
> if (exception2)
> deal with exception 2
> else
> do normal stuff
> }
So restore the old form.
Also fix the comment describing the logic, as it was confusing.
Requested-by: Peter Zijlstra <peterz@infradead.org>
Cc: Gustavo A. R. Silva <garsilva@embeddedor.com>
Cc: Frans Klaver <fransklaver@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
parent
4422d80ed7
commit
3b9c08ae3d
@ -611,17 +611,23 @@ static void cputime_adjust(struct task_cputime *curr,
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utime = curr->utime;
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/*
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* If either stime or both stime and utime are 0, assume all runtime is
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* userspace. Once a task gets some ticks, the monotonicy code at
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* 'update' will ensure things converge to the observed ratio.
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* If either stime or utime are 0, assume all runtime is userspace.
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* Once a task gets some ticks, the monotonicy code at 'update:'
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* will ensure things converge to the observed ratio.
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*/
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if (stime != 0) {
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if (utime == 0)
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stime = rtime;
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else
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stime = scale_stime(stime, rtime, stime + utime);
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if (stime == 0) {
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utime = rtime;
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goto update;
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}
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if (utime == 0) {
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stime = rtime;
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goto update;
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}
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stime = scale_stime(stime, rtime, stime + utime);
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update:
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/*
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* Make sure stime doesn't go backwards; this preserves monotonicity
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* for utime because rtime is monotonic.
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