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authorPeter Zijlstra <peterz@infradead.org>2015-06-30 11:30:54 +0200
committerIngo Molnar <mingo@kernel.org>2015-08-03 12:21:21 +0200
commit9d7fb04276481c59610983362d8e023d262b58ca (patch)
tree2f6a6d497d0e088bd984876a34845c64afdffdbe /kernel/time/timer_stats.c
parentsched, sysctl: Delete an unnecessary check before unregister_sysctl_table() (diff)
downloadlinux-9d7fb04276481c59610983362d8e023d262b58ca.tar.xz
linux-9d7fb04276481c59610983362d8e023d262b58ca.zip
sched/cputime: Guarantee stime + utime == rtime
While the current code guarantees monotonicity for stime and utime independently of one another, it does not guarantee that the sum of both is equal to the total time we started out with. This confuses things (and peoples) who look at this sum, like top, and will report >100% usage followed by a matching period of 0%. Rework the code to provide both individual monotonicity and a coherent sum. Suggested-by: Fredrik Markstrom <fredrik.markstrom@gmail.com> Reported-by: Fredrik Markstrom <fredrik.markstrom@gmail.com> Tested-by: Fredrik Markstrom <fredrik.markstrom@gmail.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Stanislaw Gruszka <sgruszka@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: jason.low2@hp.com Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/time/timer_stats.c')
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