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Frederic Weisbecker abf917cd91 cputime: Generic on-demand virtual cputime accounting ... If we want to stop the tick further idle, we need to be able to account the cputime without using the tick. Virtual based cputime accounting solves that problem by hooking into kernel/user boundaries. However implementing CONFIG_VIRT_CPU_ACCOUNTING require low level hooks and involves more overhead. But we already have a generic context tracking subsystem that is required for RCU needs by archs which plan to shut down the tick outside idle. This patch implements a generic virtual based cputime accounting that relies on these generic kernel/user hooks. There are some upsides of doing this: - This requires no arch code to implement CONFIG_VIRT_CPU_ACCOUNTING if context tracking is already built (already necessary for RCU in full tickless mode). - We can rely on the generic context tracking subsystem to dynamically (de)activate the hooks, so that we can switch anytime between virtual and tick based accounting. This way we don't have the overhead of the virtual accounting when the tick is running periodically. And one downside: - There is probably more overhead than a native virtual based cputime accounting. But this relies on hooks that are already set anyway. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Li Zhong <zhong@linux.vnet.ibm.com> Cc: Namhyung Kim <namhyung.kim@lge.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de>		12 years ago
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Kconfig	cputime: Generic on-demand virtual cputime accounting	12 years ago
Makefile	…
calibrate.c	…
do_mounts.c	block: partition: msdos: provide UUIDs for partitions	12 years ago
do_mounts.h	…
do_mounts_initrd.c	don't bother with kernel_thread/kernel_execve for launching linuxrc	12 years ago
do_mounts_md.c	init: disable sparse checking of the mount.o source files	13 years ago
do_mounts_rd.c	init: disable sparse checking of the mount.o source files	13 years ago
init_task.c	…
initramfs.c	init: disable sparse checking of the mount.o source files	13 years ago
main.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal	12 years ago
noinitramfs.c	…
version.c	proc: Usable inode numbers for the namespace file descriptors.	12 years ago