shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-03-25 12:00:22 +09:00
Code Issues Packages Projects Releases Wiki Activity
Files
af84ca38aff94061dd0711edbb99b0900a9c28fd
linux/kernel
History
KAMEZAWA Hiroyuki 478735e388 /proc/stat: fix scalability of irq sum of all cpu 
In /proc/stat, the number of per-IRQ event is shown by making a sum each
irq's events on all cpus.  But we can make use of kstat_irqs().

kstat_irqs() do the same calculation, If !CONFIG_GENERIC_HARDIRQ,
it's not a big cost. (Both of the number of cpus and irqs are small.)

If a system is very big and CONFIG_GENERIC_HARDIRQ, it does

	for_each_irq()
		for_each_cpu()
			- look up a radix tree
			- read desc->irq_stat[cpu]
This seems not efficient. This patch adds kstat_irqs() for
CONFIG_GENRIC_HARDIRQ and change the calculation as

	for_each_irq()
		look up radix tree
		for_each_cpu()
			- read desc->irq_stat[cpu]

This reduces cost.

A test on (4096cpusp, 256 nodes, 4592 irqs) host (by Jack Steiner)

%time cat /proc/stat > /dev/null

Before Patch:	 2.459 sec
After Patch :	  .561 sec

[akpm@linux-foundation.org: unexport kstat_irqs, coding-style tweaks]
[akpm@linux-foundation.org: fix unused variable 'per_irq_sum']
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Tested-by: Jack Steiner <steiner@sgi.com>
Acked-by: Jack Steiner <steiner@sgi.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-27 18:03:13 -07:00
..
debug
kdb,debug_core: adjust master cpu switch logic against new debug_core locking
2010-10-22 15:34:13 -05:00
gcov
llseek: automatically add .llseek fop
2010-10-15 15:53:27 +02:00
irq
/proc/stat: fix scalability of irq sum of all cpu
2010-10-27 18:03:13 -07:00
power
use clear_page()/copy_page() in favor of memset()/memcpy() on whole pages
2010-10-26 16:52:13 -07:00
time
ntp: Clamp PLL update interval
2010-09-09 20:48:37 +02:00
trace
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2010-10-24 13:41:39 -07:00
.gitignore
Update kernel/.gitignore with new auto-generated files
2008-02-09 23:27:01 -08:00
acct.c
pass a struct path to vfs_statfs
2010-08-09 16:48:42 -04:00
async.c
async: use workqueue for worker pool
2010-07-14 11:29:46 +02:00
audit_tree.c
fanotify: use both marks when possible
2010-07-28 10:18:55 -04:00
audit_watch.c
Revert "fsnotify: store struct file not struct path"
2010-08-12 14:23:04 -07:00
audit.c
Merge branch 'for-linus' of git://git.infradead.org/users/eparis/notify
2010-08-10 11:39:13 -07:00
audit.h
Audit: split audit watch Kconfig
2010-07-28 09:58:19 -04:00
auditfilter.c
audit: do not get and put just to free a watch
2010-07-28 09:58:17 -04:00
auditsc.c
vfs: add helpers to get root and pwd
2010-08-11 00:28:20 -04:00
backtracetest.c
backtrace: replace timer with tasklet + completions
2008-06-27 18:09:16 +02:00
bounds.c
kbuild: move bounds.h to include/generated
2009-12-12 13:08:14 +01:00
capability.c
sched: Remove remaining USER_SCHED code
2010-04-02 20:12:00 +02:00
cgroup_freezer.c
cgroup_freezer: update_freezer_state() does incorrect state transitions
2010-10-27 18:03:08 -07:00
cgroup.c
cgroups: add check for strcpy destination string overflow
2010-10-27 18:03:09 -07:00
compat.c
compat: Make compat_alloc_user_space() incorporate the access_ok()
2010-09-14 16:08:45 -07:00
configs.c
llseek: automatically add .llseek fop
2010-10-15 15:53:27 +02:00
cpu.c
sched: adjust when cpu_active and cpuset configurations are updated during cpu on/offlining
2010-06-08 21:40:36 +02:00
cpuset.c
security: remove unused parameter from security_task_setscheduler()
2010-10-21 10:12:44 +11:00
cred.c
signals: move cred_guard_mutex from task_struct to signal_struct
2010-10-27 18:03:12 -07:00
delayacct.c
headers: taskstats_kern.h trim
2009-09-18 09:48:52 -07:00
dma.c
kernel/dma.c: remove a CVS keyword
2008-10-16 11:21:30 -07:00
elfcore.c
elf coredump: add extended numbering support
2010-03-06 11:26:46 -08:00
exec_domain.c
sys_personality: remove the bogus checks in sys_personality()->__set_personality() path
2010-08-09 20:45:05 -07:00
exit.c
exit: add lock context annotation on find_new_reaper()
2010-10-27 18:03:13 -07:00
extable.c
Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-04-05 11:04:19 -07:00
fork.c
signals: move cred_guard_mutex from task_struct to signal_struct
2010-10-27 18:03:12 -07:00
freezer.c
sched: fix nr_uninterruptible accounting of frozen tasks really
2009-07-18 14:19:53 +02:00
futex_compat.c
futex: Change 3rd arg of fetch_robust_entry() to unsigned int*
2010-09-18 12:19:21 +02:00
futex.c
new helper: ihold()
2010-10-25 21:26:11 -04:00
groups.c
kernel/groups.c: fix integer overflow in groups_search
2010-09-09 18:57:24 -07:00
hrtimer.c
hrtimer: Preserve timer state in remove_hrtimer()
2010-10-14 13:29:59 +02:00
hung_task.c
lockup detector: Fix grammar by adding a missing "to" in the comments
2010-08-17 09:11:52 +02:00
hw_breakpoint.c
perf, hw_breakpoint: Fix crash in hw_breakpoint creation
2010-10-18 19:58:55 +02:00
irq_work.c
irq_work: Add generic hardirq context callbacks
2010-10-18 19:58:50 +02:00
itimer.c
itimers: Fix racy writes to cpu_itimer fields
2009-11-18 16:32:12 +01:00
jump_label.c
jump label: Add jump_label_text_reserved() to reserve jump points
2010-09-22 16:30:46 -04:00
kallsyms.c
kdb: core for kgdb back end (2 of 2)
2010-05-20 21:04:21 -05:00
Kconfig.freezer
container freezer: implement freezer cgroup subsystem
2008-10-20 08:52:34 -07:00
Kconfig.hz
sched: fix SCHED_HRTICK dependency
2008-07-28 14:37:38 +02:00
Kconfig.locks
mutex: Better control mutex adaptive spinning config
2009-12-03 11:50:11 +01:00
Kconfig.preempt
rcu: provide RCU options on non-preempt architectures too
2008-12-25 09:31:28 +01:00
kexec.c
use clear_page()/copy_page() in favor of memset()/memcpy() on whole pages
2010-10-26 16:52:13 -07:00
kfifo.c
kfifo: fix scatterlist usage
2010-10-01 10:50:58 -07:00
kmod.c
Make do_execve() take a const filename pointer
2010-08-17 18:07:43 -07:00
kprobes.c
Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl
2010-10-22 10:52:56 -07:00
ksysfs.c
sysfs: add struct file* to bin_attr callbacks
2010-05-21 09:37:31 -07:00
kthread.c
kthread: implement kthread_data()
2010-06-29 10:07:09 +02:00
latencytop.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
lockdep_internals.h
lockdep: No need to disable preemption in debug atomic ops
2010-05-04 05:38:16 +02:00
lockdep_proc.c
lockstat: Make lockstat counting per cpu
2010-04-06 00:15:37 +02:00
lockdep_states.h
lockdep: move state bit definitions around
2009-02-14 23:27:59 +01:00
lockdep.c
lockdep: Check the depth of subclass
2010-10-18 18:44:26 +02:00
Makefile
Merge branch 'core-memblock-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2010-10-21 18:52:11 -07:00
module.c
Merge commit 'v2.6.36-rc7' into perf/core
2010-10-08 10:46:27 +02:00
mutex-debug.c
headers: remove sched.h from interrupt.h
2009-10-11 11:20:58 -07:00
mutex-debug.h
locking: Implement new raw_spinlock
2009-12-14 23:55:32 +01:00
mutex.c
mutex: Fix annotations to include it in kernel-locking docbook
2010-09-03 08:19:51 +02:00
mutex.h
mutex: implement adaptive spinning
2009-01-14 18:09:02 +01:00
notifier.c
sched: Use lockdep-based checking on rcu_dereference()
2010-02-25 10:34:26 +01:00
ns_cgroup.c
cgroup: notify ns_cgroup deprecated
2010-10-27 18:03:09 -07:00
nsproxy.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
padata.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
2010-08-04 15:23:14 -07:00
panic.c
lib/bug.c: add oops end marker to WARN implementation
2010-08-11 08:59:22 -07:00
params.c
param: locking for kernel parameters
2010-08-11 23:04:20 +09:30
perf_event.c
Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2010-10-21 12:54:49 -07:00
pid_namespace.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
pid.c
Add RCU check for find_task_by_vpid().
2010-08-19 17:18:02 -07:00
pm_qos_params.c
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2010-10-24 13:41:39 -07:00
posix-cpu-timers.c
Merge branch 'writable_limits' of git://decibel.fi.muni.cz/~xslaby/linux
2010-08-10 12:07:51 -07:00
posix-timers.c
posix_timer: Move copy_to_user(created_timer_id) down in timer_create()
2010-07-23 15:08:12 +02:00
printk.c
printk: change type of 'boot_delay' to int *
2010-10-26 16:52:16 -07:00
profile.c
llseek: automatically add .llseek fop
2010-10-15 15:53:27 +02:00
ptrace.c
signals: move cred_guard_mutex from task_struct to signal_struct
2010-10-27 18:03:12 -07:00
range.c
kernel/range: remove unused definition of ARRAY_SIZE()
2010-08-09 20:45:06 -07:00
rcupdate.c
Merge branch 'rcu/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-2.6-rcu into core/rcu
2010-10-07 09:43:11 +02:00
rcutiny_plugin.h
rcu: performance fixes to TINY_PREEMPT_RCU callback checking
2010-08-27 10:51:17 -07:00
rcutiny.c
rcu: Add a TINY_PREEMPT_RCU
2010-08-20 08:55:00 -07:00
rcutorture.c
rcu: fix sparse errors in rcutorture.c
2010-09-23 09:16:42 -07:00
rcutree_plugin.h
rcu: fix _oddness handling of verbose stall warnings
2010-09-02 16:15:30 -07:00
rcutree_trace.c
rcu: Add tracing data to support queueing models
2010-09-23 09:16:53 -07:00
rcutree.c
rcu: using ACCESS_ONCE() to observe the jiffies_stall/rnp->qsmask value
2010-10-07 10:41:06 -07:00
rcutree.h
rcu: Add tracing data to support queueing models
2010-09-23 09:16:53 -07:00
relay.c
kernel/: convert cpu notifier to return encapsulate errno value
2010-05-27 09:12:48 -07:00
res_counter.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
resource.c
resource: shared I/O region support
2010-05-11 12:01:10 -07:00
rtmutex_common.h
rt_mutex: add proxy lock routines
2009-04-06 11:14:02 +02:00
rtmutex-debug.c
sched: Convert pi_lock to raw_spinlock
2009-12-14 23:55:33 +01:00
rtmutex-debug.h
…
rtmutex-tester.c
rtmutex-tester: make it build without BKL
2010-10-19 11:29:56 +02:00
rtmutex.c
rtmutes: Convert rtmutex.lock to raw_spinlock
2009-12-14 23:55:33 +01:00
rtmutex.h
…
rwsem.c
sched: mark rwsem functions as __sched for wchan/profiling
2007-12-18 15:21:13 +01:00
sched_clock.c
sched_clock: Add local_clock() API and improve documentation
2010-06-09 10:34:49 +02:00
sched_cpupri.c
sched: No need for bootmem special cases
2010-07-17 12:06:22 +02:00
sched_cpupri.h
sched: No need for bootmem special cases
2010-07-17 12:06:22 +02:00
sched_debug.c
sched: Use correct macro to display sched_child_runs_first in /proc/sched_debug
2010-07-21 21:46:12 +02:00
sched_fair.c
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2010-10-21 12:55:43 -07:00
sched_features.h
sched: Remove irq time from available CPU power
2010-10-18 20:52:27 +02:00
sched_idletask.c
sched: Cure load average vs NO_HZ woes
2010-04-23 11:02:02 +02:00
sched_rt.c
sched: Do not account irq time to current task
2010-10-18 20:52:26 +02:00
sched_stats.h
sched: Remove the obsolete exit_state/signal hacks
2010-06-18 10:46:56 +02:00
sched_stoptask.c
sched: Create special class for stop/migrate work
2010-10-18 18:41:58 +02:00
sched.c
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2010-10-21 12:55:43 -07:00
seccomp.c
x86-64: seccomp: fix 32/64 syscall hole
2009-03-02 15:41:30 -08:00
semaphore.c
semaphore: __down_common: use signal_pending_state()
2008-08-05 14:33:47 -07:00
signal.c
signals: annotate lock context change on ptrace_stop()
2010-10-27 18:03:12 -07:00
smp.c
generic-ipi: Fix deadlock in __smp_call_function_single
2010-09-10 16:48:40 +02:00
softirq.c
Merge branches 'softirq-for-linus', 'x86-debug-for-linus', 'x86-numa-for-linus', 'x86-quirks-for-linus', 'x86-setup-for-linus', 'x86-uv-for-linus' and 'x86-vm86-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2010-10-23 08:25:36 -07:00
spinlock.c
locking: Cleanup the name space completely
2009-12-14 23:55:33 +01:00
srcu.c
kernel: Remove undead ifdef CONFIG_DEBUG_LOCK_ALLOC
2010-09-23 09:14:51 -07:00
stacktrace.c
stacktrace: provide save_stack_trace_tsk() weak alias
2008-12-25 11:44:43 +01:00
stop_machine.c
stop_machine: convert cpu notifier to return encapsulate errno value
2010-10-26 16:52:15 -07:00
sys_ni.c
powerpc: define a compat_sys_recv cond_syscall
2010-09-23 17:03:55 +10:00
sys.c
pid: make setpgid() system call use RCU read-side critical section
2010-08-31 17:00:18 -07:00
sysctl_binary.c
sysctl: don't use own implementation of hex_to_bin()
2010-05-25 08:07:05 -07:00
sysctl_check.c
sysctl: min/max bounds are optional
2010-10-15 14:42:24 -07:00
sysctl.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2010-10-26 17:58:44 -07:00
taskstats.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
test_kprobes.c
kprobes: Fix selftest to clear flags field for reusing probes
2010-10-14 08:55:27 +02:00
time.c
time: Kill off CONFIG_GENERIC_TIME
2010-07-27 12:40:54 +02:00
timeconst.pl
Make constants in kernel/timeconst.h fixed 64 bits
2008-05-02 16:18:42 -07:00
timer.c
irq_work: Add generic hardirq context callbacks
2010-10-18 19:58:50 +02:00
tracepoint.c
jump_label: Use more consistent naming
2010-10-18 19:58:56 +02:00
tsacct.c
mm: clean up mm_counter
2010-03-06 11:26:23 -08:00
uid16.c
headers: utsname.h redux
2009-09-23 18:13:10 -07:00
up.c
smp_call_function_single(): be slightly less stupid, fix #2
2009-01-12 16:04:37 +01:00
user_namespace.c
user_ns: Introduce user_nsmap_uid and user_ns_map_gid.
2010-06-16 14:55:34 -07:00
user-return-notifier.c
core: Clean up user return notifers use of per_cpu
2009-12-02 10:22:59 +01:00
user.c
kernel/user.c: add lock release annotation on free_user()
2010-10-26 16:52:15 -07:00
utsname_sysctl.c
sysctl kernel: Remove binary sysctl logic
2009-11-12 02:04:55 -08:00
utsname.c
utsns: extract creeate_uts_ns()
2009-06-18 13:03:55 -07:00
wait.c
docbook: add more wait/wake/completion to device-drivers docbook
2010-10-26 17:32:41 -07:00
watchdog.c
Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2010-10-21 12:54:49 -07:00
workqueue_sched.h
workqueue: implement concurrency managed dynamic worker pool
2010-06-29 10:07:14 +02:00
workqueue.c
workqueues: s/ON_STACK/ONSTACK/
2010-10-26 16:52:14 -07:00