| commit | c3508f8f341f19f6b1c3f854f144540427668151 | |
| author | Ravikiran G Thirumalai <kiran@scalex86.org> | |
| Sat, 21 Jul 2007 15:10:19 +0000 (21 17:10 +0200) | ||
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | |
| Sun, 22 Jul 2007 01:37:09 +0000 (21 18:37 -0700) | ||
| tree | c5a8ccb4d0ba0a1f108a2233d52232387257e8a0 | treesnapshot (tar.gz zip) |
| parent | 2618f86e0010fc6703e77af3613bac7ade46efc6 | commitdiff |
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>
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>
| fs/proc/proc_misc.c | diffblobblamehistory |