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kernel-ark/fs/proc
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Ravikiran G Thirumalai c3508f8f34 x86_64: Avoid too many remote cpu references due to /proc/stat 
Too many remote cpu references due to /proc/stat.

On x86_64, with newer kernel versions, kstat_irqs is a bit of a problem.
On every call to kstat_irqs, the process brings in per-cpu data from all
online cpus.  Doing this for NR_IRQS, which is now 256 + 32 * NR_CPUS
results in (256+32*63) * 63 remote cpu references on a 64 cpu config.
/proc/stat is parsed by common commands like top, who etc, causing lots
of cacheline transfers

This statistic seems useless.  Other 'big iron' arches disable this.

AK: changed to remove for all SMP setups
AK: add comment

Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-21 18:37:09 -07:00
..
array.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched 2007-07-16 11:02:49 -07:00
base.c coredump masking: add an interface for core dump filter 2007-07-19 10:04:47 -07:00
generic.c procfs directory entry cleanup 2007-07-16 09:05:43 -07:00
inode-alloc.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
inode.c mm: Remove slab destructors from kmem_cache_create(). 2007-07-20 10:11:58 +09:00
internal.h proc: maps protection 2007-05-08 11:15:02 -07:00
kcore.c [PATCH] elf: fix kcore note size calculation 2006-12-07 08:39:38 -08:00
kmsg.c [PATCH] Make most file operations structs in fs/ const 2006-03-28 09:16:06 -08:00
Makefile [PATCH] Fix kernel build with EMBEDDED & PROC_FS & !PROC_SYSCTL 2007-03-27 09:05:16 -07:00
mmu.c [PATCH] fix impossible VmallocChunk 2005-05-17 07:59:10 -07:00
nommu.c [PATCH] mark struct file_operations const 6 2007-02-12 09:48:45 -08:00
proc_devtree.c [POWERPC] Make struct property's value a void * 2007-04-13 03:55:18 +10:00
proc_misc.c x86_64: Avoid too many remote cpu references due to /proc/stat 2007-07-21 18:37:09 -07:00
proc_sysctl.c Remove redundant check from proc_sys_setattr() 2007-05-08 11:15:10 -07:00
proc_tty.c Make /proc/tty/drivers use seq_list_xxx helpers 2007-07-16 09:05:42 -07:00
root.c [PATCH] proc: fix linkage with CONFIG_SYSCTL=y, CONFIG_PROC_SYSCTL=n 2007-04-02 10:06:08 -07:00
task_mmu.c proc: maps protection 2007-05-08 11:15:02 -07:00
task_nommu.c proc: maps protection 2007-05-08 11:15:02 -07:00
vmcore.c [PATCH] i386: Allow i386 crash kernels to handle x86_64 dumps 2007-05-02 19:27:09 +02:00