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Red Hat Bugzilla – Attachment 610842 Details for
Bug 834097
Performance regression between kernels 2.6.32-131.0.15 and 2.6.32-220
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Module to test IPIs on system
ipi-time-test.c (text/plain), 910 bytes, created by
Prarit Bhargava
on 2012-09-07 20:39:29 UTC
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Description:
Module to test IPIs on system
Filename:
MIME Type:
Creator:
Prarit Bhargava
Created:
2012-09-07 20:39:29 UTC
Size:
910 bytes
patch
obsolete
>/* > * Just an skeleton module. Useful for debugging. > * > * Written by: Prarit Bhargava <prarit@redhat.com> > * > * Please don't clutter this file with a bunch of bells-and-whistles. It > * is meant to be a simple module. > */ >#include <linux/init.h> >#include <linux/module.h> >#include <linux/kernel.h> > >static int ipi_time_runs = 1; > >static void ipi_cpu_callback(void *unused) >{ > printk("cpu %d callback\n", smp_processor_id()); >} > >static int init_ipi_time(void) >{ > int i; > > for (i = 0; i <= ipi_time_runs; i++) { > printk("ipi test start\n"); > on_each_cpu(ipi_cpu_callback, NULL, 0); > printk("ipi test finish\n"); > } > return 0; >} > >static void cleanup_ipi_time(void) >{ > printk("unloading module\n"); >} > >module_init(init_ipi_time); >module_exit(cleanup_ipi_time); > >MODULE_LICENSE("GPL"); // avoid GPL issues > >module_param(ipi_time_runs, int, 0444); >MODULE_PARM_DESC(ipi_time_arg, "An argument for this module");
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