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* [S390] /proc/stat idle field for idle cpusMartin Schwidefsky2009-04-231-0/+5
| | | | | | | | | | | | | The cpu idle field in the output of /proc/stat is too small for cpus that have been idle for more than a tick. Add the architecture hook arch_idle_time that allows to add the not accounted idle time of a sleeping cpu without waking the cpu. The s390 implementation of arch_idle_time uses the already existing s390_idle_data per_cpu variable to find the sleep time of a neighboring idle cpu. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* proc: remove ifdef CONFIG_SPARSE_IRQ from stat.cKOSAKI Motohiro2008-12-261-10/+1
| | | | | | | | | | | Impact: cleanup irq_desc can be NULL when CONFIG_SPARSE_IRQ=y only. therefore, NULL checking can move into kstat_irqs_cpu() of SPARSE_IRQ version. Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Acked-by: "Yinghai Lu" <yinghai@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* proc: enclose desc variable of show_stat() in CONFIG_SPARSE_IRQKOSAKI Motohiro2008-12-161-5/+2
| | | | | | | | | | | | | | | | | | Impact: restructure code to fix compiler warning commit 240d367b4e6c6e3c5075e034db14dba60a6f5fa7 moved desc usage point into #ifdef CONFIG_SPARSE_IRQ. Eliminate the desc variable, otherwise following warning happens: fs/proc/stat.c: In function 'show_stat': fs/proc/stat.c:31: warning: unused variable 'desc' [ akpm: cleaned up the patch to remove #ifdef ] Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sparseirq: fix Alpha build failureYinghai Lu2008-12-091-7/+13
| | | | | | | | | | | | | | | Impact: build fix on Alpha -tip testing found this build failure on the Alpha defconfig: /home/mingo/tip/fs/proc/stat.c: In function 'show_stat': /home/mingo/tip/fs/proc/stat.c:48: error: implicit declaration of function 'for_each_irq_desc' /home/mingo/tip/fs/proc/stat.c:48: error: expected ';' before '{' token can not use irq_desc() in stat.c on older architectures. Signed-off-by: Yinghai Lu <yinghai@kernel.orgg> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sparse irq_desc[] array: core kernel and x86 changesYinghai Lu2008-12-081-6/+11
| | | | | | | | | | | | | | | | | | | | | Impact: new feature Problem on distro kernels: irq_desc[NR_IRQS] takes megabytes of RAM with NR_CPUS set to large values. The goal is to be able to scale up to much larger NR_IRQS value without impacting the (important) common case. To solve this, we generalize irq_desc[NR_IRQS] to an (optional) array of irq_desc pointers. When CONFIG_SPARSE_IRQ=y is used, we use kzalloc_node to get irq_desc, this also makes the IRQ descriptors NUMA-local (to the site that calls request_irq()). This gets rid of the irq_cfg[] static array on x86 as well: irq_cfg now uses desc->chip_data for x86 to store irq_cfg. Signed-off-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* proc: move /proc/stat to fs/proc/stat.cAlexey Dobriyan2008-10-231-0/+153
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
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