| commit | 4004c69ad68dd03733179277280ea2946990ba36 | |
| author | Ravikiran G Thirumalai <kiran@scalex86.org> | |
| Thu, 19 Jul 2007 08:47:53 +0000 (19 01:47 -0700) | ||
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | |
| Thu, 19 Jul 2007 17:04:43 +0000 (19 10:04 -0700) | ||
| tree | 521f206229832f757c0f7652101d187a7a6ff5c8 | treesnapshot (tar.gz zip) |
| parent | a0a9983509f45b2225ca87fdcf7b40ea916834ed | commitdiff |
Avoid too many remote cpu references due to /proc/stat
Optimize show_stat to collect per-irq information just once.
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.
Considering the fact that we already compute this value per-cpu, we can
save on the remote references as below.
Signed-off-by: Alok N Kataria <alok.kataria@calsoftinc.com>
Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Optimize show_stat to collect per-irq information just once.
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.
Considering the fact that we already compute this value per-cpu, we can
save on the remote references as below.
Signed-off-by: Alok N Kataria <alok.kataria@calsoftinc.com>
Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| fs/proc/proc_misc.c | diffblobblamehistory |