Rik van Riel
5743021831
sched/cputime: Count actually elapsed irq & softirq time ...
Currently, if there was any irq or softirq time during 'ticks'
jiffies, the entire period will be accounted as irq or softirq
time.
This is inaccurate if only a subset of the time was actually spent
handling irqs, and could conceivably mis-count all of the ticks during
a period as irq time, when there was some irq and some softirq time.
This can actually happen when irqtime_account_process_tick is called
from account_idle_ticks, which can pass a larger number of ticks down
all at once.
Fix this by changing irqtime_account_hi_update(), irqtime_account_si_update(),
and steal_account_process_ticks() to work with cputime_t time units, and
return the amount of time spent in each mode.
Rename steal_account_process_ticks() to steal_account_process_time(), to
reflect that time is now accounted in cputime_t, instead of ticks.
Additionally, have irqtime_account_process_tick() take into account how
much time was spent in each of steal, irq, and softirq time.
The latter could help improve the accuracy of cputime
accounting when returning from idle on a NO_HZ_IDLE CPU.
Properly accounting how much time was spent in hardirq and
softirq time will also allow the NO_HZ_FULL code to re-use
these same functions for hardirq and softirq accounting.
Signed-off-by: Rik van Riel <riel@redhat.com>
[ Make nsecs_to_cputime64() actually return cputime64_t. ]
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Radim Krcmar <rkrcmar@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Link: http://lkml.kernel.org/r/1468421405-20056-2-git-send-email-fweisbec@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-07-14 10:42:34 +02:00
bitops: Do not default to __clear_bit() for __clear_bit_unlock()
2016-03-21 10:50:48 +01:00
mm, asm-generic: define PUD_SHIFT in <asm-generic/4level-fixup.h>
2015-02-11 17:06:03 -08:00
asm-generic: Add common asm-offsets.h
2015-06-23 13:35:49 +09:00
include/asm-generic/atomic-long.h: force inlining of some atomic_long operations
2016-03-17 15:09:34 -07:00
atomic, arch: Audit atomic_{read,set}()
2015-09-23 09:54:28 +02:00
atomic: Provide atomic_{or,xor,and}
2015-07-27 14:06:24 +02:00
audit: Modify a set of system calls in audit class definitions
2014-01-17 17:01:46 -05:00
audit: Modify a set of system calls in audit class definitions
2014-01-17 17:01:46 -05:00
asm-generic: implement virt_xxx memory barriers
2016-01-12 20:46:59 +02:00
arch: Prepare for smp_mb__{before,after}_atomic()
2014-04-18 11:40:30 +02:00
asm-generic changes for 4.6
2016-03-24 23:13:48 -07:00
ipv4: Update parameters for csum_tcpudp_magic to their original types
2016-03-13 23:55:13 -04:00
asm-generic: COMMON_CLK defines __clk_{get,put}
2014-09-25 18:00:45 -07:00
LLVMLinux: Remove warning about returning an uninitialized variable
2014-04-09 13:44:35 -07:00
asm-generic: cmpxchg: avoid warnings from macro-ized cmpxchg() implementations
2015-10-15 00:21:13 +02:00
sched, time: Fix build error with 64 bit cputime_t on 32 bit systems
2014-10-03 05:46:55 +02:00
sched/cputime: Count actually elapsed irq & softirq time
2016-07-14 10:42:34 +02:00
__div64_32(): make it overridable at compile time
2015-11-16 14:42:12 -05:00
asm-generic: Add dma-contiguous.h
2014-09-22 13:35:51 +02:00
Merge branch 'akpm' (patches from Andrew)
2015-09-08 17:52:23 -07:00
asm-generic: Fix local variable shadow in __set_fixmap_offset
2016-02-16 15:10:44 +00:00
asm-generic/futex: Re-enable preemption in futex_atomic_cmpxchg_inatomic()
2016-04-21 11:06:09 +02:00
gpio: allow setting ARCH_NR_GPIOS from Kconfig
2016-02-19 00:22:54 +01:00
mm: Fix generic hugetlb pte check return type.
2013-10-02 20:02:35 -04:00
io-64-nonatomic: Add relaxed accessor variants
2016-05-03 18:23:02 +01:00
include/asm-generic/ioctl.h: fix _IOC_TYPECHECK sparse error
2014-06-06 16:08:13 -07:00
x86/mm, asm-generic: Add ioremap_wt() for creating Write-Through mappings
2015-06-07 15:28:56 +02:00
irq_work: Introduce arch_irq_work_has_interrupt()
2014-09-13 18:38:07 +02:00
KVM: add kvm_para_available to asm-generic/kvm_para.h
2013-06-05 13:21:29 +03:00
locking/mcs: Allow architecture specific asm files to be used for contended case
2014-02-09 21:18:52 +01:00
mm: add PHYS_PFN, use it in __phys_to_pfn()
2016-01-14 16:00:49 -08:00
mm: clean up per architecture MM hook header files
2015-07-17 16:39:53 -07:00
mm/core, x86/mm/pkeys: Differentiate instruction fetches
2016-02-18 19:46:29 +01:00
asm-generic: Remove asm-generic arch_bprm_mm_init()
2014-11-22 21:52:08 +01:00
asm-generic: Add msi.h
2014-11-23 13:01:47 +01:00
locking/mutex: Use acquire/release semantics
2015-10-06 17:28:20 +02:00
arch: Make __mutex_fastpath_lock_retval return whether fastpath succeeded or not
2013-06-26 12:10:55 +02:00
locking/mutex: Use acquire/release semantics
2015-10-06 17:28:20 +02:00
asm-generic: page.h: Remove useless get_user_page and free_user_page
2016-02-26 15:24:55 +01:00
PCI: Remove unused pcibios_select_root() (again)
2015-06-08 07:56:21 -05:00
PCI: Add pci_iomap_wc() variants
2015-08-25 09:59:45 +02:00
percpu: preffity percpu header files
2014-06-17 19:12:40 -04:00
arch: fix has_transparent_hugepage()
2016-05-19 19:12:14 -07:00
sched/preempt: Fix preempt_count manipulations
2016-05-17 12:24:21 +02:00
locking/qrwlock: Make use of _{acquire|release|relaxed}() atomics
2015-08-12 11:59:06 +02:00
locking/qrwlock: Rename ->lock to ->wait_lock
2015-09-18 09:27:29 +02:00
locking/qspinlock: Fix spin_unlock_wait() some more
2016-06-08 14:29:08 +02:00
locking/qspinlock: Move __ARCH_SPIN_LOCK_UNLOCKED to qspinlock_types.h
2016-02-29 10:02:43 +01:00
asm-generic: remove _STK_LIM_MAX
2014-05-15 00:32:09 +01:00
rtc: cmos: century support
2015-09-05 13:19:09 +02:00
locking/rwsem: Introduce basis for down_write_killable()
2016-04-13 10:42:20 +02:00
seccomp: Get compat syscalls from asm-generic header
2016-05-13 14:02:00 +02:00
asm/sections: add helpers to check for section data
2016-01-16 11:17:24 -08:00
SIGNAL: Move generic copy_siginfo() to signal.h
2016-05-13 14:02:10 +02:00
crypto: create generic version of ablk_helper
2013-09-24 06:02:24 +10:00
syscall.h: fix doc text for syscall_get_arch()
2014-09-23 16:20:00 -04:00
burying unused conditionals
2013-02-14 09:21:15 -05:00
treewide: Remove old email address
2015-11-23 09:44:58 +01:00
asm-generic: {get,put}_user ptr argument evaluate only 1 time
2015-11-08 22:44:42 +09:00
asm-generic: allow generic unaligned access if the arch supports it
2014-05-08 10:22:23 +02:00
We get rid of the general module prefix confusion with a binary config option,
2013-05-05 10:58:06 -07:00
x86/asm: Make sure verify_cpu() has a good stack
2016-04-13 11:52:19 +02:00
include/asm-generic/vtime.h: avoid zero-length file
2013-09-30 14:31:02 -07:00
Make asm/word-at-a-time.h available on all architectures
2015-07-08 16:41:55 -04:00
5743021831