linux-toradex.git/fs/proc/stat.c, branch v2.6.32.31

proc: export statistics for softirq to /proc

2009-06-18T20:03:41+00:00

Export statistics for softirq in /proc/softirqs and /proc/stat.

1. /proc/softirqs
Implement /proc/softirqs which shows the number of softirq
for each CPU like /proc/interrupts.

2. /proc/stat
Add the "softirq" line to /proc/stat.
This line shows the number of softirq for all cpu.
The first column is the total of all softirqs and
each subsequent column is the total for particular softirq.

[kosaki.motohiro@jp.fujitsu.com: remove redundant for_each_possible_cpu() loop]
Signed-off-by: Keika Kobayashi 
Reviewed-by: Hiroshi Shimamoto 
Cc: KOSAKI Motohiro 
Cc: Ingo Molnar 
Cc: Eric Dumazet 
Cc: Alexey Dobriyan 
Signed-off-by: KOSAKI Motohiro 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[S390] /proc/stat idle field for idle cpus

2009-04-23T11:58:17+00:00

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

proc: remove ifdef CONFIG_SPARSE_IRQ from stat.c

2008-12-26T08:48:18+00:00

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 
Acked-by: "Yinghai Lu" 
Signed-off-by: Ingo Molnar

proc: enclose desc variable of show_stat() in CONFIG_SPARSE_IRQ

2008-12-16T10:24:14+00:00

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 
Signed-off-by: Andrew Morton 
Signed-off-by: Ingo Molnar

sparseirq: fix Alpha build failure

2008-12-09T03:16:54+00:00

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 
Signed-off-by: Ingo Molnar

sparse irq_desc[] array: core kernel and x86 changes

2008-12-08T13:31:51+00:00

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 
Signed-off-by: Ingo Molnar

proc: move /proc/stat to fs/proc/stat.c

2008-10-23T11:14:05+00:00

Signed-off-by: Alexey Dobriyan