• Frederic Weisbecker's avatar
    sched/cputime: Increment kcpustat directly on irqtime account · a499a5a1
    Frederic Weisbecker authored
    The irqtime is accounted is nsecs and stored in
    cpu_irq_time.hardirq_time and cpu_irq_time.softirq_time. Once the
    accumulated amount reaches a new jiffy, this one gets accounted to the
    kcpustat.
    
    This was necessary when kcpustat was stored in cputime_t, which could at
    worst have jiffies granularity. But now kcpustat is stored in nsecs
    so this whole discretization game with temporary irqtime storage has
    become unnecessary.
    
    We can now directly account the irqtime to the kcpustat.
    Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
    Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    Cc: Fenghua Yu <fenghua.yu@intel.com>
    Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
    Cc: Michael Ellerman <mpe@ellerman.id.au>
    Cc: Paul Mackerras <paulus@samba.org>
    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: Tony Luck <tony.luck@intel.com>
    Cc: Wanpeng Li <wanpeng.li@hotmail.com>
    Link: http://lkml.kernel.org/r/1485832191-26889-17-git-send-email-fweisbec@gmail.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    a499a5a1
cputime.c 22.3 KB